Balls steel grinding for ball mills. Specification Balls according to GOST 7524 89
Steel grinding balls for ball mills, GOST 7524-89
Mining engineering. GOST 7524-89: Steel grinding balls for ball mills. Specifications. OKS: Mining and minerals, Mineral processing equipment. GOSTs. Balls steel grinding for ball mills. .... class=text>
GOST 7524-89
Balls steel grinding for ball mills. Specifications
GOST 7524-89
Group G41
INTERSTATE STANDARD
STEEL GRINDING BALLS FOR BALL MILLS
Specifications
Grinding steel balls for ball mills. Specifications
MKS 73.120
OKP 11 7200
Introduction date 1990-01-01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR
2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards of 01.02.89 N 148
3. REPLACE GOST 7524-83
4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS
Item number |
|
GOST 166-89 | |
GOST 5950-2000 | |
GOST 9012-59 | |
GOST 9013-59 | |
GOST 14192-96 | |
GOST 15846-2002 | |
GOST 21650-76 | |
GOST 24182-80 | |
GOST 24597-81 |
5. The limitation of the validity period was removed by the Decree of the State Standard of 08/05/92 N 885
6. EDITION (September 2009) with Amendments No. 1, 2, approved in December 1989, August 1992 (IUS 4-90, 11-92)
This standard applies to rolled, forged, stamped steel grinding balls used for grinding ores, coal, clinker and other materials in ball mills.
The requirements of this standard are mandatory, with the exception of the requirements of paragraphs 2.4 and 5.1, which are recommended.
(Changed edition, Rev. N 2).
1. MAIN PARAMETERS AND DIMENSIONS
1.1. Balls are divided by hardness into groups:
1 - normal hardness general purpose;
2 - increased hardness for general purposes;
3 - high hardness for grinding ferrous metal ores;
4 - especially high hardness for grinding non-ferrous metal ores, cement and refractories.
1.2. Dimensions, maximum deviations for them, calculated nominal volumes and mass of balls must comply with Table 1.
Table 1
Dimensions in mm
Conditional | Nominal diameter | Previous off by nominal diameter | Estimated nominal volume, cm | Estimated nominal weight, kg |
Notes: |
||||
1. Deviations from the geometric shape of the ball should not exceed the maximum deviations for the nominal diameter. |
||||
2. The volume and mass of the ball are calculated from the nominal diameter at a steel density of 7.85 g/cm. |
||||
3. By agreement between the manufacturer and the consumer, it is allowed to normalize the upper limit of the hardness of the balls. |
||||
An example of a symbol for a ball with a diameter of 80 mm of increased hardness (2):
Ball 80-2 GOST 7524-89
2. TECHNICAL REQUIREMENTS
2.1. The balls are manufactured in accordance with the requirements of this standard according to the technological documentation approved in the prescribed manner.
2.2. Characteristics
2.2.1. Balls of groups 1 and 2 are made of carbon, low alloy and alloy structural steel.
2.2.2. The mass fraction of carbon in carbon steel must be at least:
2.2.3. The carbon equivalent of low alloy and alloy structural steel must be at least:
2.2.4. Balls of group 3 are made from steel grades according to GOST 24182*, group 4 - from tool alloyed steel of types X and HGS according to GOST 5950. It is allowed to manufacture balls from steel of other grades according to GOST 5950, provided that the required hardness is ensured.
________________
* On the territory of the Russian Federation, GOST R 51685-2000 applies.
2.2.5. The hardness of the balls must comply with the standards specified in Table. 2.
table 2
Nominal ball diameter, mm | Hardness (HB), not less, for groups |
||||
on the surface of the ball | at a depth of 1/2 the radius of the ball |
||||
Notes: |
|||||
1. Group 4 balls are designed for grinding non-ferrous metal ores, cement and refractories. |
|||||
2. The hardness standard at a depth of 1/2 of the ball radius is optional until 01.01.92. |
|||||
2.2.6. On the surface of the balls, defects that take the dimensions of the balls beyond the limit deviations are not allowed.
2.3. Marking
Transport marking - according to GOST 14192.
2.4. Package
Balls with a diameter up to 30 mm inclusive, and at the request of the consumer St. 30 mm, packed in boxes or specialized containers.
Boxes are formed into transport packages.
Package parameters - according to GOST 24597.
Bonding means - according to GOST 21650.
(Changed edition, Rev. N 1).
3. ACCEPTANCE
3.1. Balls are accepted in batches. The batch must consist of balls of the same size, one group and must be issued with one quality document containing:
- name and trademark of the manufacturer;
- batch number;
- stamp of the technical control department;
- results of hardness tests;
- conventional designation of balls.
The mass of the batch should not exceed 150 tons.
3.2. To check the size, quality and hardness of the surface of the balls, 10 balls are selected from at least five different places in the lot.
If unsatisfactory control results are obtained for at least one of the indicators, a repeated control is carried out on it on a double number of balls taken from the same batch.
The results of the re-inspection are extended to the entire batch.
3.3. To control the hardness of the balls of group 4 at a depth of 1/2 of the radius, three balls are taken from three different places in each twentieth lot.
If unsatisfactory results are obtained on at least one ball, a second test is carried out on twice the number of balls taken from the same batch.
Upon receipt of unsatisfactory results of repeated periodic tests, the tests are transferred to acceptance tests until satisfactory results are obtained on two batches in a row.
3.4. Not more than 10% of the balls selected for control are allowed that do not meet the requirements of this standard in terms of size and surface quality.
4. CONTROL METHODS
4.1. The dimensions of the balls are checked with a caliper according to GOST 166 or another tool that provides the necessary accuracy.
4.2. The hardness of the balls is measured by the Rockwell method (GOST 9013) or Brinell (GOST 9012).
4.2.1. The hardness on the surface of the ball is determined on two diametrically opposite sites.
4.2.2. Hardness at a depth of 1/2 of the ball radius is determined on one site on a flat surface prepared in accordance with the requirements of GOST 9013 and GOST 9012 by removing the ball metal to the required depth.
4.2.3. When determining Rockwell hardness, four measurements are taken at each site.
The first three measurements are carried out at the vertices of an imaginary equilateral triangle with a side length of 6-8 mm. These measurements are trial. Their result is not recorded in the test report.
The fourth measurement is carried out in the central part of the specified triangle. The result of this measurement is recorded in the test report.
4.2.4. When determining Brinell hardness, one measurement is carried out at each site; the result is recorded in the test report.
4.2.5. Hardness is taken according to the average value of measurements for all control balls.
4.3. Carbon equivalent of steel as a percentage, calculated by the formula
where , , , , , , are mass fractions of carbon, manganese, silicon, chromium, nickel, copper, vanadium, %
4.4. The surface quality of the balls is checked visually, without the use of magnifying instruments.
4.5. It is allowed to use statistical and non-destructive methods of quality control of balls according to the methods approved in the established order.
5. TRANSPORT AND STORAGE
5.1. Balloons are transported by transport of all types in accordance with the rules for the carriage of goods in force for this type of transport. The placement and securing of goods transported by rail must comply with the technical conditions for loading and securing goods approved by the Ministry of Railways.
The balls are transported on an open rolling stock. At the request of the consumer, the balls are transported in covered wagons and cars with a covered body.
Transportation by rail is carried out by carload and small shipments.
Packing, marking and transportation of balloons to the regions of the Far North and equivalent areas - according to GOST 15846.
Library of GOSTs and regulatory documents
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GOST 24182-80
5. The limitation of the validity period was removed by the Decree of the State Standard of 08/05/92 N 885
6. EDITION (September 2009) with Amendments No. 1, 2, approved in December 1989, August 1992 (IUS 4-90, 11-92)
This standard applies to rolled, forged, stamped steel grinding balls used for grinding ores, coal, clinker and other materials in ball mills.
The requirements of this standard are mandatory, with the exception of the requirements of paragraphs 2.4 and 5.1, which are recommended.
(Changed edition, Rev. N 2).
1. MAIN PARAMETERS AND DIMENSIONS
1.1. Balls are divided by hardness into groups:
1 - normal hardness general purpose;
2 - increased hardness for general purposes;
3 - high hardness for grinding ferrous metal ores;
4 - especially high hardness for grinding non-ferrous metal ores, cement and refractories.
1.2. Dimensions, maximum deviations for them, calculated nominal volumes and mass of balls must comply with Table 1.
Table 1
Dimensions in mm
Conditional | Nominal diameter | Previous off by nominal diameter | Estimated nominal volume, cm | Estimated nominal weight, kg |
Notes: |
||||
1. Deviations from the geometric shape of the ball should not exceed the maximum deviations for the nominal diameter. |
||||
2. The volume and mass of the ball are calculated from the nominal diameter at a steel density of 7.85 g/cm. |
||||
3. By agreement between the manufacturer and the consumer, it is allowed to normalize the upper limit of the hardness of the balls. |
||||
An example of a symbol for a ball with a diameter of 80 mm of increased hardness (2):
Ball 80-2 GOST 7524-89
2. TECHNICAL REQUIREMENTS
2.1. The balls are manufactured in accordance with the requirements of this standard according to the technological documentation approved in the prescribed manner.
2.2. Characteristics
2.2.1. Balls of groups 1 and 2 are made of carbon, low alloy and alloy structural steel.
2.2.2. The mass fraction of carbon in carbon steel must be at least:
conditional | diameter | |||||||
2.2.3. The carbon equivalent of low alloy and alloy structural steel must be at least:
conditional | diameter | |||||||
2.2.4. Group 3 balls are made from steel grades according to GOST 24182 *, group 4 - from tool alloyed steel of types X and HGS according to GOST 5950. It is allowed to manufacture balls from steel of other grades in accordance with GOST 5950, provided that the required hardness is ensured.
________________
* GOST R 51685-2000 is valid on the territory of the Russian Federation.
2.2.5. The hardness of the balls must comply with the standards specified in Table. 2.
table 2
Nominal ball diameter, mm | Hardness (HB), not less, for groups |
||||
on the surface of the ball | at a depth of 1/2 the radius of the ball |
||||
Notes: |
|||||
1. Group 4 balls are designed for grinding non-ferrous metal ores, cement and refractories. |
|||||
2. The hardness standard at a depth of 1/2 of the ball radius is optional until 01.01.92. |
|||||
2.2.6. On the surface of the balls, defects that take the dimensions of the balls beyond the limit deviations are not allowed.
2.3. Marking
Transport marking - in accordance with GOST 14192.
2.4. Package
Balls with a diameter up to 30 mm inclusive, and at the request of the consumer St. 30 mm, packed in boxes or specialized containers.
Boxes are formed into transport packages.
Package parameters - according to GOST 24597.
Fastening means - according to GOST 21650.
(Changed edition, Rev. N 1).
3. ACCEPTANCE
3.1. Balls are accepted in batches. The batch must consist of balls of the same size, one group and must be issued with one quality document containing:
- name and trademark of the manufacturer;
- batch number;
- stamp of the technical control department;
- results of hardness tests;
- conventional designation of balls.
The mass of the batch should not exceed 150 tons.
3.2. To check the size, quality and hardness of the surface of the balls, 10 balls are selected from at least five different places in the lot.
If unsatisfactory control results are obtained for at least one of the indicators, a repeated control is carried out on it on a double number of balls taken from the same batch.
The results of the re-inspection are extended to the entire batch.
3.3. To control the hardness of the balls of group 4 at a depth of 1/2 of the radius, three balls are taken from three different places in each twentieth lot.
If unsatisfactory results are obtained on at least one ball, a second test is carried out on twice the number of balls taken from the same batch.
Upon receipt of unsatisfactory results of repeated periodic tests, the tests are transferred to acceptance tests until satisfactory results are obtained on two batches in a row.
3.4. Not more than 10% of the balls selected for control are allowed that do not meet the requirements of this standard in terms of size and surface quality. GOST 9013 and GOST 9012 by removing the ball metal to the required depth.
4.2.3. When determining Rockwell hardness, four measurements are taken at each site.
The first three measurements are carried out at the vertices of an imaginary equilateral triangle with a side length of 6-8 mm. These measurements are trial. Their result is not recorded in the test report.
The fourth measurement is carried out in the central part of the specified triangle. The result of this measurement is recorded in the test report.
4.2.4. When determining Brinell hardness, one measurement is carried out at each site; the result is recorded in the test report.
4.2.5. Hardness is taken according to the average value of measurements for all control balls.
4.3. Carbon equivalent of steel as a percentage, calculated by the formula
where , , , , , , are mass fractions of carbon, manganese, silicon, chromium, nickel, copper, vanadium, %
4.4. The surface quality of the balls is checked visually, without the use of magnifying instruments.
4.5. It is allowed to use statistical and non-destructive methods of quality control of balls according to the methods approved in the established order.
5. TRANSPORT AND STORAGE
5.1. Balloons are transported by transport of all types in accordance with the rules for the carriage of goods in force for this type of transport. The placement and securing of goods transported by rail must comply with the technical conditions for loading and securing goods approved by the Ministry of Railways.
The balls are transported on an open rolling stock. At the request of the consumer, the balls are transported in covered wagons and cars with a covered body.
Transportation by rail is carried out by carload and small shipments.
Packing, marking and transportation of balloons to the regions of the Far North and equivalent areas - according to GOST 15846.
Electronic text of the document
prepared by Kodeks JSC and verified against:
official publication
ordinary carbon steel
quality and low-alloyed: Sat. GOSTs. -
M.: Standartinform, 2009
Specifications
Grinding steel balls for ball mills.
Introduction date 1990-01-01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR
DEVELOPERS
S.I. Rudyuk, Ph.D. tech. sciences; V.I.Baguzin, Ph.D. tech. sciences; V.K.Solyony, Ph.D. tech. sciences; V.L. Kostrynin, Ph.D. tech. sciences; V.F.Kovalenko, Ph.D. tech. sciences; E.I. Feldman, Ph.D. tech. sciences; Zh.M. Roeva, Ph.D. economy sciences; L.D. Longus
2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards of 01.02.89 N 148
3. REPLACE GOST 7524-83
4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS
|
Item number |
|
|
GOST 5950-73 |
|
|
GOST 9012-59 |
|
|
GOST 9013-59 |
|
|
GOST 14192-96 |
|
|
GOST 15846-79 |
|
|
GOST 21650-76 |
|
|
GOST 24182-80 |
|
|
GOST 24597-81 |
5. The limitation of the validity period was removed by the Decree of the State Standard of 08/05/92 N 885
6. REPUBLICATION with Amendments No. 1, 2, approved in December 1989, August 1992 (IUS 4-90, 11-92)
This standard applies to rolled, forged, stamped steel grinding balls used for grinding ores, coal, clinker and other materials in ball mills.
The requirements of this standard are mandatory, with the exception of the requirements of paragraphs 2.4 and 5.1, which are recommended.
(Changed edition, Rev. N 2).
1. MAIN PARAMETERS AND DIMENSIONS
1.1. Balls are divided by hardness into groups:
1 - normal hardness general purpose;
2 - increased hardness for general purposes;
3 - high hardness for grinding ferrous metal ores;
4 - especially high hardness for grinding non-ferrous metal ores, cement and refractories.
1.2. Dimensions, maximum deviations for them, calculated nominal volumes and mass of balls must comply with Table 1.
Table 1
Dimensions in mm
|
Conditional diameter |
Nominal diameter |
Previous off by nominal diameter |
Estimated nominal volume, cm |
Estimated nominal weight, kg |
|
Notes: |
||||
|
1. Deviations from the geometric shape of the ball should not exceed the maximum deviations for the nominal diameter. |
||||
|
2. The volume and mass of the ball are calculated from the nominal diameter at a steel density of 7.85 g/cm. |
||||
|
3. By agreement between the manufacturer and the consumer, it is allowed to normalize the upper limit of the hardness of the balls. |
||||
An example of a symbol for a ball with a diameter of 80 mm of increased hardness (2):
Ball 80-2 GOST 7524-89
2. TECHNICAL REQUIREMENTS
2.1. The balls are manufactured in accordance with the requirements of this standard according to the technological documentation approved in the prescribed manner.
2.2. Characteristics
2.2.1. Balls of groups 1 and 2 are made of carbon, low alloy and alloy structural steel.
2.2.2. The mass fraction of carbon in carbon steel must be at least:
|
0,40% - |
for |
balls |
conditional |
diameter |
15-60 mm; |
2.2.3. The carbon equivalent of low alloy and alloy structural steel must be at least:
|
0,50% - |
for |
balls |
conditional |
diameter |
15-60 mm; |
2.2.4. Balls of group 3 are made from steel grades according to GOST 24182, group 4 - from tool alloyed steel of types X and HGS according to GOST 5950. It is allowed to manufacture balls from steel of other grades according to GOST 5950, provided that the required hardness is ensured.
2.2.5. The hardness of the balls must comply with the standards specified in Table. 2.
table 2
|
Nominal ball diameter, mm |
Hardness (НВ), not less, for groups |
||||||
|
on the surface of the ball |
at a depth of ½ the radius of the ball |
||||||
|
43 (401 ) |
49 (461 ) |
55 (534 ) |
55 (534 ) |
45 (415 ) |
|||
|
40 (352 ) |
42 (375 ) |
52 (495 ) |
|||||
|
35 (302 ) |
38 (331 ) |
50 (477 ) |
|||||
|
Notes: |
|||||||
|
1. Group 4 balls are designed for grinding non-ferrous metal ores, cement and refractories. |
|||||||
|
2. The hardness standard at a depth of ½ of the radius of the ball is optional until 01.01.92. |
|||||||
2.2.6. On the surface of the balls, defects that take the dimensions of the balls beyond the limit deviations are not allowed.
2.3. Marking
Transport marking - according to GOST 14192.
2.4. Package
Balls with a diameter up to 30 mm inclusive, and at the request of the consumer St. 30 mm, packed in boxes or specialized containers.
Boxes are formed into transport packages.
Package parameters - according to GOST 24597.
Bonding means - according to GOST 21650.
(Changed edition, Rev. N 1).
3. ACCEPTANCE
3.1. Balls are accepted in batches. The batch must consist of balls of the same size, one group and must be issued with one quality document containing
- name and trademark of the manufacturer;
- batch number;
- stamp of the technical control department;
— results of hardness tests;
- conventional designation of balls.
The mass of the batch should not exceed 150 tons.
3.2. To check the size, quality and hardness of the surface of the balls, 10 balls are selected from at least five different places in the lot.
If unsatisfactory control results are obtained for at least one of the indicators, a repeated control is carried out on it on a double number of balls taken from the same batch.
The results of the re-inspection are extended to the entire batch.
3.3. To control the hardness of the balls of group 4 at a depth of ½ radius, three balls are taken from three different places in each twentieth lot.
If unsatisfactory results are obtained on at least one ball, a second test is carried out on twice the number of balls taken from the same batch.
Upon receipt of unsatisfactory results of repeated periodic tests, the tests are transferred to acceptance tests until satisfactory results are obtained on two batches in a row.
3.4. Not more than 10% of the balls selected for control are allowed that do not meet the requirements of this standard in terms of size and surface quality.
4. CONTROL METHODS
4.1. The dimensions of the balls are checked with a caliper according to GOST 166 or another tool that provides the necessary accuracy.
4.2. The hardness of the balls is measured by the Rockwell method (GOST 9013) or Brinell (GOST 9012).
4.2.1. The hardness on the surface of the ball is determined on two diametrically opposite sites.
4.2.2. Hardness at a depth of ½ of the radius of the ball is determined on one site on a flat surface prepared in accordance with the requirements of GOST 9013 and GOST 9012 by removing the metal of the ball to the required depth.
4.2.3. When determining Rockwell hardness, four measurements are taken at each site.
The first three measurements are carried out at the vertices of an imaginary equilateral triangle with a side length of 6-8 mm. These measurements are trial. Their result is not recorded in the test report.
The fourth measurement is carried out in the central part of the specified triangle. The result of this measurement is recorded in the test report.
4.2.4. When determining Brinell hardness, one measurement is carried out at each site; the result is recorded in the test report.
4.2.5. Hardness is taken according to the average value of measurements for all control balls.
4.3. The carbon equivalent of steel C in percent, is calculated by the formula
where C, Mn, Si, Cr, Ni, Cu, V are mass fractions of carbon, manganese, silicon, chromium, nickel, copper, vanadium, %
4.4. The surface quality of the balls is checked visually, without the use of magnifying instruments.
4.5. It is allowed to use statistical and non-destructive methods of quality control of balls according to the methods approved in the established order.
5. TRANSPORT AND STORAGE
5.1. Balloons are transported by transport of all types in accordance with the rules for the carriage of goods in force for this type of transport. The placement and securing of goods transported by rail must comply with the technical conditions for loading and securing goods approved by the Ministry of Railways.
The balls are transported on an open rolling stock. At the request of the consumer, the balls are transported in covered wagons and cars with a covered body.
Transportation by rail is carried out by carload and small shipments.
Packing, labeling and transportation of balloons to the Far North and equivalent areas - according to GOST 15846.
The text of the document is verified by: official publication Carbon steel of ordinary quality and low alloy.
Sat. GOSTs. - M .: IPK Standards Publishing House, 1998
You can get information about our own production of grinding balls on the page, you can place an order for the production of grinding balls using or by calling the numbers indicated on the page
GOST 7524-89
INTERSTATE STANDARD
GRINDING STEEL BALLS
FOR BALL MILLS
TECHNICAL CONDITIONS
Introduction date 01.01.90
This standard applies to rolled, forged, stamped steel grinding balls used for grinding ores, coal, clinker and other materials in ball mills.
The requirements of this standard are mandatory, with the exception of the requirements of paragraphs. and , which are recommended.
(Revised edition, Rev. No. 2).
1. MAIN PARAMETERS AND DIMENSIONS
1.1. Balls are divided by hardness into groups:
1 - normal hardness general purpose;
2 - increased hardness for general purposes;
3 - high hardness for grinding ferrous metal ores;
4 - especially high hardness for grinding non-ferrous metal ores, cement and refractories.
1.2. Dimensions, limit deviations for them, calculated nominal volumes and mass of balls must comply with Table. .
Table 1
Dimensions in mm
|
Nominal diameter |
Previous off by nominal diameter |
Estimated nominal volume, cm 3 |
Estimated nominal weight, kg |
|
|
15,0 |
±1.0 |
1,76 |
0,014 |
|
|
20,0 |
4,18 |
0,033 |
||
|
25,0 |
8,18 |
0,064 |
||
|
31,5 |
±2.0 |
16,4 |
0,128 |
|
|
41,5 |
37,4 |
0,294 |
||
|
52,0 |
±3.0 |
0,58 |
||
|
62,0 |
0,98 |
|||
|
73,0 |
1,60 |
|||
|
83,0 |
2,35 |
|||
|
94,0 |
±4.0 |
3,41 |
||
|
104,0 |
4,62 |
|||
|
114,0 |
±4.0 |
6,09 |
||
|
125,0 |
±5.0 |
1023 |
8,03 |
|
|
Notes: 1. Deviations from the geometric shape of the ball should not exceed the maximum deviations for the nominal diameter. 2. The volume and mass of the ball are calculated from the nominal diameter at a steel density of 7.85 g/cm 3 . 3. By agreement between the manufacturer and the consumer, it is allowed to normalize the upper limit of the hardness of the balls. |
||||
Symbol example ball with a diameter of 80 mm increased hardness (2):
Table 2
|
Hardness HRC 3 (НВ), not less, for groups |
|||||
|
on the surface of the ball |
at a depth of 1/2 the radius of the ball |
||||
|
15-70 |
43(401) |
49(461) |
55(534) |
55(534) |
45(415) |
|
80-100 |
40(352) |
42(375) |
52(495) |
||
|
110-120 |
35(302) |
38(331) |
50(477) |
||
|
Notes: 1. Group 4 balls are designed for grinding non-ferrous metal ores, cement and refractories. 2. The hardness standard at a depth of 1/2 of the ball radius is optional until 01.01.92. |
|||||
2.2.6. On the surface of the balls, defects that take the dimensions of the balls beyond the limit deviations are not allowed.
Transport marking - in accordance with GOST 14192.
Balls with a diameter up to 30 mm inclusive, and at the request of the consumer St. 30 mm, packed in boxes or specialized containers. Boxes are formed into transport packages. Package parameters - according to GOST 24597. Fastening means - according to GOST 21650.
(Revised edition, Rev. No. 1).
3. ACCEPTANCE
3.1. Balls are accepted in batches. The batch must consist of balls of the same size, one group and must be issued with one quality document containing:
Name and trademark of the manufacturer;
Batch number;
Stamp of the technical control department;
Hardness test results;
Conventional designation of balls.
The mass of the batch should not exceed 150 tons.
3.2. To check the size, quality and hardness of the surface of the balls, 10 balls are selected from at least five different places in the lot.
If unsatisfactory control results are obtained for at least one of the indicators, a repeated control is carried out on it on a double number of balls taken from the same batch. The results of the re-inspection are extended to the entire batch.
3.3. To control the hardness of the balls of group 4 at a depth of 1/2 of the radius, three balls are taken from three different places in each twentieth lot.
If unsatisfactory results are obtained on at least one ball, a second test is carried out on twice the number of balls taken from the same batch.
Upon receipt of unsatisfactory results of repeated periodic tests, the tests are transferred to acceptance tests until satisfactory results are obtained on two batches in a row.
3.4. Not more than 10% of the balls selected for control are allowed that do not meet the requirements of this standard in terms of size and surface quality.
4. CONTROL METHODS
The balls are transported on an open rolling stock. At the request of the consumer, the balls are transported in covered wagons and cars with a covered body.
Transportation by rail is carried out by carload and small shipments.
Packing, marking and transportation of balloons to the regions of the Far North and equivalent areas - according to GOST 15846.
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR
2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards No. 148 dated February 1, 1989
3. REPLACE GOST 7524-83
4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS
|
Item number |
Item number |
||
|
GOST 166-89 |
GOST 24597-81 |
||
|
GOST 14192-96 |
5. The limitation of the validity period was removed by the Decree of the State Standard of 08/05/92 No. 885
6. EDITION (September 2009) with Amendments No. 1, 2, approved in December 1989, August 1992 (IUS 4-90, 11-92)
GOST 7524-89
Group G41
STATE STANDARD OF THE UNION OF THE SSR
STEEL GRINDING BALLS FOR BALL MILLS
Specifications
Grinding steel balls for ball mills.
Specifications
Introduction date 1990-01-01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR
DEVELOPERS
S.I. Rudyuk, Ph.D. tech. sciences; V.I.Baguzin, Ph.D. tech. sciences; V.K.Solyony, Ph.D. tech. sciences; V.L. Kostrynin, Ph.D. tech. sciences; V.F.Kovalenko, Ph.D. tech. sciences; E.I. Feldman, Ph.D. tech. sciences; Zh.M. Roeva, Ph.D. economy sciences; L.D. Longus
2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards of 01.02.89 N 148
3. REPLACE GOST 7524-83
4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS
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Item number |
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GOST 24182-80 |
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5. The limitation of the validity period was removed by the Decree of the State Standard of 08/05/92 N 885
6. REPUBLICATION with Amendments No. 1, 2, approved in December 1989, August 1992 (IUS 4-90, 11-92)
This standard applies to rolled, forged, stamped steel grinding balls used for grinding ores, coal, clinker and other materials in ball mills.
The requirements of this standard are mandatory, with the exception of the requirements of paragraphs 2.4 and 5.1, which are recommended.
(Changed edition, Rev. N 2).
1. MAIN PARAMETERS AND DIMENSIONS
1.1. Balls are divided by hardness into groups:
1 - normal hardness general purpose;
2 - increased hardness for general purposes;
3 - high hardness for grinding ferrous metal ores;
4 - especially high hardness for grinding non-ferrous metal ores, cement and refractories.
1.2. Dimensions, maximum deviations for them, calculated nominal volumes and mass of balls must comply with Table 1.
Table 1
Dimensions in mm
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Conditional |
Nominal diameter |
Previous off by nominal diameter |
Estimated nominal volume, |
Estimated nominal weight, kg |
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Notes: |
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1. Deviations from the geometric shape of the ball should not exceed the maximum deviations for the nominal diameter. |
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2. The volume and mass of the ball are calculated from the nominal diameter at a steel density of 7.85 g/cm. |
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3. By agreement between the manufacturer and the consumer, it is allowed to normalize the upper limit of the hardness of the balls. |
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An example of a symbol for a ball with a diameter of 80 mm of increased hardness (2):
Ball 80-2 GOST 7524-89
2. TECHNICAL REQUIREMENTS
2.1. The balls are manufactured in accordance with the requirements of this standard according to the technological documentation approved in the prescribed manner.
2.2. Characteristics
2.2.1. Balls of groups 1 and 2 are made of carbon, low alloy and alloy structural steel.
2.2.2. The mass fraction of carbon in carbon steel must be at least:
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conditional |
diameter |
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2.2.3. The carbon equivalent of low alloy and alloy structural steel must be at least:
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conditional |
diameter |
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2.2.4. Balls of group 3 are made from steel grades according to GOST 24182, group 4 - from tool alloyed steel of types X and HGS according to GOST 5950. It is allowed to manufacture balls from steel of other grades in accordance with GOST 5950, provided that the required hardness is ensured.
2.2.5. The hardness of the balls must comply with the standards specified in Table. 2.
table 2
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Nominal ball diameter, mm |
Hardness (HB), not less, for groups |
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on the surface of the ball |
at a depth of 1/2 the radius of the ball |
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Notes: |
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1. Group 4 balls are designed for grinding non-ferrous metal ores, cement and refractories. |
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2. The hardness standard at a depth of 1/2 of the ball radius is optional until 01.01.92. |
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2.2.6. On the surface of the balls, defects that take the dimensions of the balls beyond the limit deviations are not allowed.
2.3. Marking
Transport marking - in accordance with GOST 14192.
2.4. Package
Balls with a diameter up to 30 mm inclusive, and at the request of the consumer St. 30 mm, packed in boxes or specialized containers.
Boxes are formed into transport packages.
(Changed edition, Rev. N 1).
3. ACCEPTANCE
3.1. Balls are accepted in batches. The batch must consist of balls of the same size, one group and must be issued with one quality document containing:
Name and trademark of the manufacturer;
Batch number;
Stamp of the technical control department;
Hardness test results;
Conventional designation of balls.
The mass of the batch should not exceed 150 tons.
3.2. To check the size, quality and hardness of the surface of the balls, 10 balls are selected from at least five different places in the lot.
If unsatisfactory control results are obtained for at least one of the indicators, a repeated control is carried out on it on a double number of balls taken from the same batch.
The results of the re-inspection are extended to the entire batch.
3.3. To control the hardness of the balls of group 4 at a depth of 1/2 of the radius, three balls are taken from three different places in each twentieth lot.
If unsatisfactory results are obtained on at least one ball, a second test is carried out on twice the number of balls taken from the same batch.
Upon receipt of unsatisfactory results of repeated periodic tests, the tests are transferred to acceptance tests until satisfactory results are obtained on two batches in a row.
3.4. Not more than 10% of the balls selected for control are allowed that do not meet the requirements of this standard in terms of size and surface quality.
4. CONTROL METHODS
4.1. The dimensions of the balls are checked with a caliper according to GOST 166 or another tool that provides the necessary accuracy.
4.2. The hardness of the balls is measured by the Rockwell method (GOST 9013) or Brinell (GOST 9012).
4.2.1. The hardness on the surface of the ball is determined on two diametrically opposite sites.
4.2.2. Hardness at a depth of 1/2 of the ball radius is determined on one site on a flat surface prepared in accordance with the requirements of GOST 9013 and GOST 9012 by removing the ball metal to the required depth.
4.2.3. When determining Rockwell hardness, four measurements are taken at each site.
The first three measurements are carried out at the vertices of an imaginary equilateral triangle with a side length of 6-8 mm. These measurements are trial. Their result is not recorded in the test report.
The fourth measurement is carried out in the central part of the specified triangle. The result of this measurement is recorded in the test report.
4.2.4. When determining Brinell hardness, one measurement is carried out at each site; the result is recorded in the test report.
The balls are transported on an open rolling stock. At the request of the consumer, the balls are transported in covered wagons and cars with a covered body.
Transportation by rail is carried out by carload and small shipments.
Packing, labeling and transportation of balloons to the Far North and equivalent areas - according to GOST 15846.
The text of the document is verified by:
official publication
Carbon steel of ordinary quality
and low alloy.
Sat. GOSTs. - M.: IPK Standards Publishing House, 1998
