JB/T 6050-1992 General rules for hardness test of heat-treated steel parts
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T6050—1992
General Rules for Hardness Test of Heat-treated Steel Parts
Published on 1992-05-05
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on 1993-07-01
Mechanical Industry Standard of the People's Republic of China
General Rules for Hardness Test of Heat-treated Steel Parts
Subject Content and Scope of Application
JB/T6050—1992
This standard specifies the basic requirements for hardness test methods and equipment selection, measurement data processing, etc. for heat-treated steel parts. This standard applies to hardness test of heat-treated steel parts at room temperature. Reference standards
GB1172
GB1818
GB2828
GB4340
GB4341
GB4342
GB5030
GB/T13321
Metal Rockwell hardness test method
Metal Brinell hardness test method
Ferrous metal hardness and strength conversion value
Gold Surface Rockwell hardness test method
Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection)Metal Vickers hardness test method
Metal Shore hardness test method
Metal micro Vickers hardness test method
Metal small load Vickers hardness test method
Steel hardness chain knife test method
3 Principles for selecting parts to be inspected
3.1 The parts to be inspected should be selected from the parts after heat treatment. Under special conditions, furnace samples with the same material and state as the parts can also be used. 3.2 When the hardness of the furnace sample is unqualified, it is allowed to re-inspect the parts and the re-inspection results shall prevail. 3.3 Furnace samples cannot be used for arbitration inspection. 3.4 Special and important parts should generally be inspected in full. 3.5 When sampling the hardness of batch parts, the sampling rate and sampling method should ensure that the parts are representative. 3.6 Large batches of parts produced stably should generally be sampled according to GB2828. 4 Hardness measurement method
Hardness measurement should be carried out according to the methods specified in GB230, GB231, GB1818, GB4340, GB4341, GB4342, GB5030 or GB/T4.17
13321. When conditions permit, GB230, GB231 or GB4340 shall be preferred. 4.2 With the agreement of all parties concerned, other hardness test methods may be used, such as single-crystal, ultrasonic, chain-strike hardness test methods and null hardness test methods.
4.3 Hardness measurement of small, thin and narrow test surfaces (such as tool edges) may be carried out according to GB230 (A scale), GB31818,
GB4340, GB4342 or GB5030 as required. 4.4 For the on-site inspection of the surface hardness of large parts, when the hardness is low (such as annealed or tempered parts), hammer-type Brinell hardness tester can be used for measurement. The Ministry of Machinery and Electronics Industry approved JB/T6050-1992 on May 5, 1993 and implemented on July 1, 1993. When the hardness is high (such as quenched, carburized or nitrided parts), in addition to GB4341 or GB/T13321, internal or ultrasonic hardness tester can also be used for measurement.
4.5 When measuring the surface hardness of parts with different hardening layer depths, the general selection of hardness test methods and test forces is shown in Table 1. The surface hardness measurement methods and selection principles of parts after different heat treatment processes are shown in Table 2. The measurement of the core or matrix hardness is generally carried out according to GB230, GB231 or GB4340.
Effective hardened layer depth
Heat treatment parts category
Normalizing and annealing parts
Tempering parts
Induction quenching and
Flame quenching parts
Carburizing and carbon
Nitriding parts
Nitriding parts
Nitrocarburizing parts
Boronizing parts, chromizing parts,
Vanadiumizing parts
Surface hardness measurement method
GB 230, GB 231,
GB4340
GB 230, GB 231
Surface hardness measurement method
Adopted standards
GB 4342, GB 5030
GB4340, GB5030
GB4340
GB1818 (15N or 30N scale)
GB4340
GB230 (A scale)
GB230 (A or C scale)
GB230 (C scale)
Generally according to GB23 1 Measurement
Test force N
9.807~49.03
>49.03~98.07
147.1 or 294.2
>98.07~294.2
588.4 or 1471.0
Selection principle
Generally measured according to GB230 (C scale). GB231 can also be used for quenched and tempered parts. GB 4340, GB 4341, tt| tt||GB 4341, GB 4342
GB5030
GB/T13321
GB 1818, GB 4340
GB 4342, GB 5030
GB4342
Thin parts shall be measured according to Article 4.3
Generally, GB230 (C scale) shall be used for measurement. When the nitriding layer is shallow, GB4340, GB1818 or GB5030 may be used. Generally, GB230 shall be used for measurement (when the effective hardening layer depth is greater than 0.65mm, C scale shall be used). When the hardening layer is shallow, GB4340, GB1818 or GB5030 may be used. Generally, GB4340 or GB5030 shall be used for measurement (the test force is generally 9.807~98.07N, and when the nitriding layer depth is less than 0.2mm, the test force generally does not exceed 49.03N). When the nitriding layer depth is greater than 0.3mm, GB1818 (15N scale) may also be used. The hardness of the compound layer is measured according to GB4342
Generally, it is measured according to GB4342 (the test force is generally 0.490~0.981N) JB/T6050—1992
4.7 If the test fails according to GB/T13321, it can be re-tested according to GB230 (C scale) or GB4340, and the re-test result shall prevail. 4.8 Castings and forgings are generally measured according to GB231. 4.9 If the determined hardness test method has several test forces to choose from, the maximum test force allowed by the test conditions should be selected. 5 Inspection equipment and personnel
5.1 Inspection equipment
5.1.1 Brinell, Rockwell, Rockwell surface, Vickers, microscopic, Shore, Leeb and ultrasonic hardness testers should all comply with the provisions of the corresponding national standards or industry standards. At the same time, they should be regularly calibrated by the relevant metrology department, and are not allowed to be used without a calibration certificate or exceeding the calibration cycle.
5.1.2 The technical requirements of standard chain files and corresponding standard test blocks shall comply with the provisions of GB/T13321. 5.1.3 Non-standardized hardness testers (such as hammer-type Brinell hardness testers) must be tested to prove that their performance and accuracy meet the relevant regulations and be agreed upon by the relevant parties before they can be used. 5.1.4 The standard Brinell, Rockwell, Rockwell Surface, Vickers, Micro Vickers and Shore hardness blocks used to calibrate or verify hardness testers shall comply with the provisions of the corresponding national standards or industry standards, and shall be regularly calibrated by the relevant metrology departments. 5.1.5 In order to ensure the accuracy and performance of the inspection equipment, the relevant maintenance system shall be observed and its relevant records shall be kept. 5.2 Inspection personnel
5.2.1 Full-time inspection personnel must undergo formal training and assessment and have formal qualification certificates. 522 Production workers involved in hardness self-inspection and mutual inspection shall receive certain training, and their operations shall be carried out under the approval or guidance of full-time inspection personnel.
6 Inspection Parts and Test Points
6.1 Inspection Parts
6.1.1 Inspection parts should be representative. The working parts of parts or other parts that can reflect the hardness of working parts should generally be used as inspection parts.
6.1.2 Inspection parts should have hardness measurement conditions and can be accurately and conveniently measured with the specified hardness tester. 6.1.3 The surface to be inspected of the normalized, annealed or tempered test piece shall be ground to remove the oxidation, decarburization or carburization layer, but the depth of the ground layer shall not exceed the machining allowance specified in the process documents.
6.1.4 The surface to be inspected shall be a flat surface as much as possible. 6.1.5 When using a hardness tester or a standard file to conduct non-destructive inspection on parts, attention should be paid to the selection of the inspection site to ensure that its indentation or file mark does not affect the final quality of the part.
6.1.6 The following sites should not be used as the measurement site for the surface or matrix hardness of the part: a. The junction between the quenching zone and the non-quenching zone of the local quenching part; b. The boundary of the carburized layer of the local chemical heat treatment part; c. The edge of the soft spot or soft zone that is allowed to exist 6.2 Number of test points
6.21 The number of test points for each test piece shall generally be no less than 3 points (no less than 5 points for Shore hardness test). If the test piece has multiple inspection sites, the number of test points for each site shall comply with relevant regulations. 6.2.2 Before the formal measurement of each piece to be tested, generally one point should be tested first, and this point will not be counted in the number of test points3
JB/T6050—1992
The number of test points for micro-pieces can be appropriately reduced, but the number of pieces to be tested should be appropriately increased. 6.2.3 For the inspection of large quantities of the same kind of pieces to be tested, the number of test points can be appropriately reduced. 6.2.4 During the measurement, if the data of a certain test point is obviously abnormal, it is generally allowed to make up two points near the point, but the original abnormal data should be recorded at the same time as the supplementary test value.
7 Processing and representation of measurement data
7.1 According to GB230, GB1818, GB4340, GB5030, the hardness values measured on the cylindrical surface or spherical surface should be corrected according to the provisions of their respective standards. The correction of the hardness value of the curved surface in other cases should be resolved by negotiation between the relevant parties. 7.2 The rounding of the hardness value should be carried out in accordance with the provisions of the corresponding national standard hardness test method. The Brinell, Rockwell and Vickers hardness values measured by non-standardized hardness test methods shall be rounded off according to the provisions of GB231, GB230 and GB4340 respectively. 7.3 It is necessary to avoid converting one hardness value into other hardness values or tensile strength. When conversion is necessary, it shall be converted according to GB1172. For conversions not included in GB1172, when necessary, they shall be carried out under the condition that a reliable conversion basis is obtained through comparative tests. 7.4 Conversion between hardness values is generally not allowed in the following situations: a. The hardness value after conversion cannot approximately match the measured value under actual measurement conditions; b. High requirements for the accuracy of measurement data; c. Hardness can be measured by the specified hardness test method; d. Arbitration inspection.
7.5 The expression of hardness values shall be in accordance with the provisions of the corresponding national standard hardness test (inspection) method. 7.6 When recording the converted hardness value, the actual measured value shall be indicated in brackets after the converted value. For example, 48.5HRC (75.0HRA). 7.7 When recording the hardness average value, the hardness values of each measuring point used to calculate the average value should generally be indicated in brackets after the hardness average value, such as 64.0HRC (63.5HRC, 64.0HRC, 64.5HRC). 8 Principles of hardness inspection of specific parts
The hardness inspection of specific parts should be carried out in accordance with the technical requirements of the part drawings, process documents, relevant standards or relevant provisions of the agreement between the two parties. If the relevant provisions are unclear, incomplete or unreasonable, they should be resolved through consultation by the relevant parties. Inspection report
The inspection report should include the following contents:
a. Part name, part number, material, quantity and heat treatment process: b. Description of the situation of the parts to be inspected. When sampling, the sampling rate and sampling method or sampling plan should be stated: C. Hardness measurement method. If necessary, the inspection location and number of test points should be stated; d. Inspection results;
e. Inspection date and signature or seal of the inspector. 4
Hardness measurement method
Brinell hardness test
(GB 231)
Rockwell hardness test
(GB230)
Surface Rockwell hardness test
(GB1818）
Vickers hardness test
(GB4340)
Small load Vickers hardness test
(GB5030)
Micro Vickers hardness test
(GB4342)
Shore hardness test
(GB4341)
Steel hardness chain knife inspection
(GB/T133 21)
Knoop hardness test
Leeb hardness test
Ultrasonic hardness test
Brinell hardness test with hammer
Additional notes:
6050-1992
Appendix A
Table of applicable scopes of various commonly used hardness measurement methods (reference part)
Scope of application
Generally, the hardness of annealed parts, normalized parts, quenched and tempered parts, castings and forgings is measured with a steel ball indenter, which is not suitable for finished parts
Hardness test of batch parts, finished parts and semi-finished parts. It is not suitable for parts with coarse grains and uneven structure. A scale is suitable for measuring the hardness of high hardness annealed parts, small and thin parts, and the surface hardness of parts with medium-thick hardened layers. B scale is suitable for measuring annealed parts, normalized parts and quenched and tempered parts with low hardness. C scale is suitable for measuring the hardness of parts treated by quenching and tempering, as well as the surface hardness of parts with thick hardened layers. To measure the hardness of thin and small parts and the surface hardness of parts with shallow or medium-thick hardened layers, the N scale is generally used.
The test force generally does not exceed 294.2N. Mainly used to measure the hardness of small and thin parts and the surface hardness of parts with shallow or medium-thick hardened layers
Measure the hardness of small and thin parts and the surface hardness of parts with shallow hardened layers. Determine the surface hardness gradient or hardened layer depth of surface hardened parts
Measure the hardness of tiny parts, very thin parts or microstructures, as well as the surface hardness of parts with very thin or very hard hardened layers
Mainly used for on-site hardness inspection of large parts
On-site hardness inspection of parts with complex shapes and large parts. Rapid hardness inspection of batch parts, the hardness of the inspection surface should not be less than 40HRC
The test force generally does not exceed 9.807N. Mainly used to measure the hardness of tiny parts, very thin parts or microstructures! And
Surface hardness of parts with very thin or very hard hardened layers On-site hardness test of large parts, assembled parts, parts with complex shapes, etc. On-site hardness test of large parts, assembled parts, parts with complex shapes, thin parts, ammonia-impregnated parts, etc. On-site hardness test of normalized, annealed or quenched and tempered large parts and raw materials This standard was proposed and managed by the Beijing Electromechanical Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Beijing Electromechanical Research Institute. The main drafters of this standard are Wu Yue and Liu Changgui. 5
People's Republic of China
Mechanical Industry Standard
General Rules for Hardness Test of Heat-treated Steel Parts
JB/T 60501992
Published and distributed by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
1/16 Printing Sheet 1/2
Word Count 10,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http:/www.JB.ac.cn26610094 During the measurement, if the data of a certain test point is obviously abnormal, it is generally allowed to make up for the measurement of two points near the point, but the original abnormal data should be recorded at the same time as the supplementary measurement value.
7 Processing and representation of measurement data
7.1 The hardness values measured on the cylindrical or spherical surface according to GB230, GB1818, GB4340, and GB5030 should be corrected according to the provisions of their respective standards. The correction of the hardness value of the curved surface in other cases should be negotiated and resolved by the relevant parties. 7.2 The rounding of the hardness value should be carried out in accordance with the provisions of the corresponding national standard hardness test method. The Brinell, Rockwell and Vickers hardness values measured by non-standardized hardness test methods should be rounded according to the provisions of GB231, GB230 and GB4340 respectively. 7.3 It should be avoided as much as possible to convert one hardness value into other hardness values or tensile strength. When conversion is necessary, it should be converted according to GB1172. For conversions not included in GB1172, if necessary, they should be carried out under the condition that a reliable conversion basis is obtained through comparative tests. 7.4 Generally, conversion between hardness values is not allowed in the following cases: a. The converted hardness value cannot approximately match the measured value under actual measurement conditions; b. The accuracy of the measured data is required to be high; c. The hardness can be measured by the specified hardness test method; d. Arbitration inspection.
7.5 The representation of hardness values shall be in accordance with the provisions of the corresponding national standard hardness test (inspection) method. 7.6 When recording the converted hardness value, the actual measured value shall be indicated in brackets after the converted value. For example, 48.5HRC (75.0HRA). 7.7 When recording the average hardness value, the hardness values of each measuring point used to calculate the average value shall generally be indicated in brackets after the average hardness value, such as 64.0HRC (63.5HRC, 64.0HRC, 64.5HRC). 8 Principles of hardness test for specific parts
The hardness test for specific parts shall be carried out in accordance with the technical requirements of the part drawings, process documents, relevant standards or relevant provisions of the agreement between the two parties. If the relevant provisions are unclear, incomplete or unreasonable, they shall be resolved through consultation by the relevant parties. Inspection report
The inspection report shall include the following contents:
a. Part name, part number, material, quantity and heat treatment process; b. Description of the part to be inspected. When sampling, the sampling rate and sampling method or sampling plan shall be stated; C. Hardness measurement method. If necessary, the inspection location and number of test points shall be stated; d. Inspection results;
e. Inspection date and signature or seal of the inspector. 4
Hardness measurement method
Brinell hardness test
(GB 231)
Rockwell hardness test
(GB230)
Surface Rockwell hardness test
(GB1818）
Vickers hardness test
(GB4340)
Small load Vickers hardness test
(GB5030)
Micro Vickers hardness test
(GB4342)
Shore hardness test
(GB4341)
Steel hardness chain knife inspection
(GB/T133 21)
Knoop hardness test
Leeb hardness test
Ultrasonic hardness test
Brinell hardness test with hammer
Additional notes:
6050-1992
Appendix A
Table of applicable scopes of various commonly used hardness measurement methods (reference part)
Scope of application
Generally, the hardness of annealed parts, normalized parts, quenched and tempered parts, castings and forgings is measured with a steel ball indenter, which is not suitable for finished parts
Hardness test of batch parts, finished parts and semi-finished parts. It is not suitable for parts with coarse grains and uneven structure. A scale is suitable for measuring the hardness of high hardness annealed parts, small and thin parts, and the surface hardness of parts with medium-thick hardened layers. B scale is suitable for measuring annealed parts, normalized parts and quenched and tempered parts with low hardness. C scale is suitable for measuring the hardness of parts treated by quenching and tempering, as well as the surface hardness of parts with thick hardened layers. To measure the hardness of thin and small parts and the surface hardness of parts with shallow or medium-thick hardened layers, the N scale is generally used.
The test force generally does not exceed 294.2N. Mainly used to measure the hardness of small and thin parts and the surface hardness of parts with shallow or medium-thick hardened layers
Measure the hardness of small and thin parts and the surface hardness of parts with shallow hardened layers. Determine the surface hardness gradient or hardened layer depth of surface hardened parts
Measure the hardness of tiny parts, very thin parts or microstructures, as well as the surface hardness of parts with very thin or very hard hardened layers
Mainly used for on-site hardness inspection of large parts
On-site hardness inspection of parts with complex shapes and large parts. Rapid hardness inspection of batch parts, the hardness of the inspection surface should not be less than 40HRC
The test force generally does not exceed 9.807N. Mainly used to measure the hardness of tiny parts, very thin parts or microstructures! And
Surface hardness of parts with very thin or very hard hardened layers On-site hardness test of large parts, assembled parts, parts with complex shapes, etc. On-site hardness test of large parts, assembled parts, parts with complex shapes, thin parts, ammonia-impregnated parts, etc. On-site hardness test of normalized, annealed or quenched and tempered large parts and raw materials This standard was proposed and managed by the Beijing Electromechanical Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Beijing Electromechanical Research Institute. The main drafters of this standard are Wu Yue and Liu Changgui. 5
People's Republic of China
Mechanical Industry Standard
General Rules for Hardness Test of Heat-treated Steel Parts
JB/T 60501992
Published and distributed by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
1/16 Printing Sheet 1/2
Word Count 10,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http:/www.JB.ac.cn26610094 During the measurement, if the data of a certain test point is obviously abnormal, it is generally allowed to make up for the measurement of two points near the point, but the original abnormal data should be recorded at the same time as the supplementary measurement value.
7 Processing and representation of measurement data
7.1 The hardness values measured on the cylindrical or spherical surface according to GB230, GB1818, GB4340, and GB5030 should be corrected according to the provisions of their respective standards. The correction of the hardness value of the curved surface in other cases should be negotiated and resolved by the relevant parties. 7.2 The rounding of the hardness value should be carried out in accordance with the provisions of the corresponding national standard hardness test method. The Brinell, Rockwell and Vickers hardness values measured by non-standardized hardness test methods should be rounded according to the provisions of GB231, GB230 and GB4340 respectively. 7.3 It should be avoided as much as possible to convert one hardness value into other hardness values or tensile strength. When conversion is necessary, it should be converted according to GB1172. For conversions not included in GB1172, if necessary, they should be carried out under the condition that a reliable conversion basis is obtained through comparative tests. 7.4 Generally, conversion between hardness values is not allowed in the following cases: a. The converted hardness value cannot approximately match the measured value under actual measurement conditions; b. The accuracy of the measured data is required to be high; c. The hardness can be measured by the specified hardness test method; d. Arbitration inspection.
7.5 The representation of hardness values shall be in accordance with the provisions of the corresponding national standard hardness test (inspection) method. 7.6 When recording the converted hardness value, the actual measured value shall be indicated in brackets after the converted value. For example, 48.5HRC (75.0HRA). 7.7 When recording the average hardness value, the hardness values of each measuring point used to calculate the average value shall generally be indicated in brackets after the average hardness value, such as 64.0HRC (63.5HRC, 64.0HRC, 64.5HRC). 8 Principles of hardness test for specific parts
The hardness test for specific parts shall be carried out in accordance with the technical requirements of the part drawings, process documents, relevant standards or relevant provisions of the agreement between the two parties. If the relevant provisions are unclear, incomplete or unreasonable, they shall be resolved through consultation by the relevant parties. Inspection report
The inspection report shall include the following contents:
a. Part name, part number, material, quantity and heat treatment process; b. Description of the part to be inspected. When sampling, the sampling rate and sampling method or sampling plan shall be stated; C. Hardness measurement method. If necessary, the inspection location and number of test points shall be stated; d. Inspection results;
e. Inspection date and signature or seal of the inspector. 4
Hardness measurement method
Brinell hardness test
(GB 231)
Rockwell hardness testWww.bzxZ.net
(GB230)
Surface Rockwell hardness test
(GB1818）
Vickers hardness test
(GB4340)
Small load Vickers hardness test
(GB5030)
Micro Vickers hardness test
(GB4342)
Shore hardness test
(GB4341)
Steel hardness chain knife inspection
(GB/T133 21)
Knoop hardness test
Leeb hardness test
Ultrasonic hardness test
Brinell hardness test with hammer
Additional notes:
6050-1992
Appendix A
Table of applicable scopes of various commonly used hardness measurement methods (reference part)
Scope of application
Generally, the hardness of annealed parts, normalized parts, quenched and tempered parts, castings and forgings is measured with a steel ball indenter, which is not suitable for finished parts
Hardness test of batch parts, finished parts and semi-finished parts. It is not suitable for parts with coarse grains and uneven structure. A scale is suitable for measuring the hardness of high hardness annealed parts, small and thin parts, and the surface hardness of parts with medium-thick hardened layers. B scale is suitable for measuring annealed parts, normalized parts and quenched and tempered parts with low hardness. C scale is suitable for measuring the hardness of parts treated by quenching and tempering, as well as the surface hardness of parts with thick hardened layers. To measure the hardness of thin and small parts and the surface hardness of parts with shallow or medium-thick hardened layers, the N scale is generally used.
The test force generally does not exceed 294.2N. Mainly used to measure the hardness of small and thin parts and the surface hardness of parts with shallow or medium-thick hardened layers
Measure the hardness of small and thin parts and the surface hardness of parts with shallow hardened layers. Determine the surface hardness gradient or hardened layer depth of surface hardened parts
Measure the hardness of tiny parts, very thin parts or microstructures, as well as the surface hardness of parts with very thin or very hard hardened layers
Mainly used for on-site hardness inspection of large parts
On-site hardness inspection of parts with complex shapes and large parts. Rapid hardness inspection of batch parts, the hardness of the inspection surface should not be less than 40HRC
The test force generally does not exceed 9.807N. Mainly used to measure the hardness of tiny parts, very thin parts or microstructures! And
Surface hardness of parts with very thin or very hard hardened layers On-site hardness test of large parts, assembled parts, parts with complex shapes, etc. On-site hardness test of large parts, assembled parts, parts with complex shapes, thin parts, ammonia-impregnated parts, etc. On-site hardness test of normalized, annealed or quenched and tempered large parts and raw materials This standard was proposed and managed by the Beijing Electromechanical Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Beijing Electromechanical Research Institute. The main drafters of this standard are Wu Yue and Liu Changgui. 5
People's Republic of China
Mechanical Industry Standard
General Rules for Hardness Test of Heat-treated Steel Parts
JB/T 60501992
Published and distributed by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
1/16 Printing Sheet 1/2
Word Count 10,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http:/www.JB.ac.cn2661009Inspection date and signature or seal of the inspector. 4
Hardness measurement method
Brinell hardness test
(GB 231)
Rockwell hardness test
(GB230)
Surface Rockwell hardness test
(GB1818）
Vickers hardness test
(GB4340)
Small load Vickers hardness test
(GB5030)
Micro Vickers hardness test
(GB4342)
Shore hardness test
(GB4341)
Steel hardness chain knife inspection
(GB/T133 21)
Knoop hardness test
Leeb hardness test
Ultrasonic hardness test
Brinell hardness test with hammer
Additional notes:
6050-1992
Appendix A
Table of applicable scopes of various commonly used hardness measurement methods (reference part)
Scope of application
Generally, the hardness of annealed parts, normalized parts, quenched and tempered parts, castings and forgings is measured with a steel ball indenter, which is not suitable for finished parts
Hardness test of batch parts, finished parts and semi-finished parts. It is not suitable for parts with coarse grains and uneven structure. A scale is suitable for measuring the hardness of high hardness annealed parts, small and thin parts, and the surface hardness of parts with medium-thick hardened layers. B scale is suitable for measuring annealed parts, normalized parts and quenched and tempered parts with low hardness. C scale is suitable for measuring the hardness of parts treated by quenching and tempering, as well as the surface hardness of parts with thick hardened layers. To measure the hardness of thin and small parts and the surface hardness of parts with shallow or medium-thick hardened layers, the N scale is generally used. The test force generally does not exceed 294.2N. It is mainly used to measure the hardness of small and thin parts and the surface hardness of parts with shallow or medium-thick hardened layers. The hardness of small and thin parts and the surface hardness of parts with shallow hardened layers. Determine the surface hardness gradient or hardened layer depth of surface hardened parts. Measure the hardness of tiny parts, very thin parts or microstructures, as well as the surface hardness of parts with very thin or very hard hardened layers. Mainly used for on-site hardness inspection of large parts. On-site hardness inspection of parts with complex shapes and large parts. Rapid hardness inspection of batch parts, the hardness of the inspection surface should not be less than 40HRC. The test force generally does not exceed 9.807N. It is mainly used to measure the hardness of tiny parts, very thin parts or microstructures! And
Surface hardness of parts with very thin or very hard hardened layers On-site hardness test of large parts, assembled parts, parts with complex shapes, etc. On-site hardness test of large parts, assembled parts, parts with complex shapes, thin parts, ammonia-impregnated parts, etc. On-site hardness test of normalized, annealed or quenched and tempered large parts and raw materials This standard was proposed and managed by the Beijing Electromechanical Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Beijing Electromechanical Research Institute. The main drafters of this standard are Wu Yue and Liu Changgui. 5
People's Republic of China
Mechanical Industry Standard
General Rules for Hardness Test of Heat-treated Steel Parts
JB/T 60501992
Published and distributed by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
1/16 Printing Sheet 1/2
Word Count 10,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http:/www.JB.ac.cn2661009Inspection date and signature or seal of the inspector. 4
Hardness measurement method
Brinell hardness test
(GB 231)
Rockwell hardness test
(GB230)
Surface Rockwell hardness test
(GB1818）
Vickers hardness test
(GB4340)
Small load Vickers hardness test
(GB5030)
Micro Vickers hardness test
(GB4342)
Shore hardness test
(GB4341)
Steel hardness chain knife inspection
(GB/T133 21)
Knoop hardness test
Leeb hardness test
Ultrasonic hardness test
Brinell hardness test with hammer
Additional notes:
6050-1992
Appendix A
Table of applicable scopes of various commonly used hardness measurement methods (reference part)
Scope of application
Generally, the hardness of annealed parts, normalized parts, quenched and tempered parts, castings and forgings is measured with a steel ball indenter, which is not suitable for finished parts
Hardness test of batch parts, finished parts and semi-finished parts. It is not suitable for parts with coarse grains and uneven structure. The A scale is suitable for measuring the hardness of high hardness annealed parts, small and thin parts, and the surface hardness of parts with medium-thick hardened layers. The B scale is suitable for measuring annealed parts, normalized parts and quenched and tempered parts with low hardness. C scale is suitable for measuring the hardness of parts treated by quenching and tempering, as well as the surface hardness of parts with thick hardened layers. To measure the hardness of thin and small parts and the surface hardness of parts with shallow or medium-thick hardened layers, the N scale is generally used.
The test force generally does not exceed 294.2N. Mainly used to measure the hardness of small and thin parts and the surface hardness of parts with shallow or medium-thick hardened layers
Measure the hardness of small and thin parts and the surface hardness of parts with shallow hardened layers. Determine the surface hardness gradient or hardened layer depth of surface hardened parts
Measure the hardness of tiny parts, very thin parts or microstructures, as well as the surface hardness of parts with very thin or very hard hardened layers
Mainly used for on-site hardness inspection of large parts
On-site hardness inspection of parts with complex shapes and large parts. Rapid hardness inspection of batch parts, the hardness of the inspection surface should not be less than 40HRC
The test force generally does not exceed 9.807N. Mainly used to measure the hardness of tiny parts, very thin parts or microstructures! And
Surface hardness of parts with very thin or very hard hardened layers On-site hardness test of large parts, assembled parts, parts with complex shapes, etc. On-site hardness test of large parts, assembled parts, parts with complex shapes, thin parts, ammonia-impregnated parts, etc. On-site hardness test of normalized, annealed or quenched and tempered large parts and raw materials This standard was proposed and managed by the Beijing Electromechanical Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Beijing Electromechanical Research Institute. The main drafters of this standard are Wu Yue and Liu Changgui. 5
People's Republic of China
Mechanical Industry Standard
General Rules for Hardness Test of Heat-treated Steel Parts
JB/T 60501992
Published and distributed by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Format 880×1230
1/16 Printing Sheet 1/2
Word Count 10,000
First Edition in January 1993
First Printing in January 1993
Print Quantity 1-500
Price 5.00 Yuan
Mechanical Industry Standard Service Network: http:/www.JB.ac.cn2661009
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