JB/T 1255-2014 PDF English
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Rolling bearings - Parts made from high-carbon chromium bearing steels - Specifications for heat treatment
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| JB/T 1255-2001 | English | RFQ |
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Specification for heat-treatment of rolling bearing parts made from high carbon chromium steel
| Obsolete |
| JB/T 1255-1991 | English | RFQ |
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(Chinese Industry Standard)
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Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: JB/T 1255-2014
JB/T 1255-2014: Rolling bearings - Parts made from high-carbon chromium bearing steels - Specifications for heat treatment
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JBT1255-2014
JB
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Record Number.
Replacing JB/T 1255-2001
Rolling Bearings - Parts Made from High-carbon
Chromium Bearing Steels -
Specifications for Heat Treatment
Issued on. MAY 6, 2014
Implemented on. OCTOBER 1, 2014
Issued by. Ministry of Industry and Information Technology of the
People’s Republic of China
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Technical Requirements... 6
4 Test Method... 9
Appendix A (Informative) Effective Wall Thickness of Ring and Effective
Diameter of Rollers... 17
Appendix B (Normative) Test Specifications for Crushing Load of Steel
Ball and Crushing Load Values... 19
Appendix C (Informative) Decarburized Layer Depth of Bearing Parts
after Quenching and Tempering... 22
Appendix D (Informative) Allowable Deformation of Bearing Ring after
Quenching and Tempering... 23
Appendix E (Informative) Residual Austenite Content of Bearing Parts
after Quenching and Tempering... 26
Appendix F (Normative) Hardness Correction of Curved Surface... 27
Appendix G (Normative) Acid Cleaning Inspection Specifications... 29
1 Scope
This standard specifies the technical requirements and test methods of the annealed,
quenched and tempered rolling bearing ring and rolling element (hereinafter referred
to as "bearing parts") made from GCr15, GCr15SiMn, GCr15SiMo and GCr18Mo
steels which meet those specified in GB/T 18254-2002.
This standard is applicable to the heat treatment quality test of bearing parts during
process and finished parts made from above-mentioned steels and also applicable to
the heat treatment quality test of bearing parts made from other high-carbon
chromium steels. The bearing parts with special requirements shall be in accordance
with corresponding product drawings.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the dated editions apply. For undated
references, the latest editions (including any amendments) apply.
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1.Test method
(scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1.Test Method
GB/T 1172 Conversion of Hardness and Strength for Ferrous Metal
GB/T 4340.1 Metallic Materials - Vickers Hardness - Part 1.Test Method
GB/T 6394 Metal - methods for Estimating the Average Grain Size
GB/T 17394 Metallic Materials - Leeb Hardness Test
GB/T 18254 High-carbon Chromium Bearing Steel
GB/T 24606 Rolling Bearings - Non-destructive Testing - Magnetic Particle
Testing
JB/T
2974-2004
Rolling Bearings - Identification Code - Supplemental Regulations
JB/T 7361 Rolling Bearings - Test Method for Hardness of Parts
JB/T 7362 Rolling Bearings - Determination of Decarburized depth for Parts
3 Technical Requirements
3.1 Technical requirements of bearing parts after spheroidizing annealing
The technical requirements of bearing parts after spheroidizing annealing shall be in
accordance with those specified in Table 1.
3.2 Technical requirements of bearing parts Martensite after quenching and
tempering
3.2.1 Hardness
The hardness and hardness difference of the same bearing part after quenching and
tempering of Martensite shall be respectively in accordance with those specified in
Table 2 and Table 3.
3.3 Technical requirements of bearing parts Bainite after isothermal quenching
The isothermal quenching structure of bearing parts shall be composed of lower
Bainite and residual carbide, a small quantity of acicular or massive Troostite and
small quantity of residual austenite are allowed. The hardness and microscopic
structure of bearing parts after isothermal quenching shall be in accordance with
those specified in Table 5.
3.4 Other technical requirements
Other technical requirements of bearing parts shall be in accordance with those
specified in Table 6.
4 Test Method
The test method shall be in accordance with those specified in Table 7.
Appendix A
(Informative)
Effective Wall Thickness of Ring and Effective Diameter of
Rollers
See Figure A.1 for the requirements of effective wall thickness of ring and effective
diameter of roller.
Appendix B
(Normative)
Test Specifications for Crushing Load of Steel Ball and
Crushing Load Values
B.1 Scope
This Appendix specifies the test specifications for crushing load of ø3mm~ø50.8mm
steel balls and their crushing load values.
B.2 Test specifications for crushing load of steel ball
B.2.1 Take three groups of heat treated steel balls (nine) from each batch for the
crushing load test and the steel balls shall have the same dimension tolerance.
B.2.2 When the heat treated rerolled steel balls are subjected to the crushing test,
the steel ball surface shall be free from grinding wheel defects, stain, bump or hard
spots, etc.
B.2.9 The tester will vibrate greatly with pointer bounced and reading inaccurate
when the steel balls crush; the attention shall be paid to the load reading when the
steel balls are about to crush.
B.2.10 The crushing mould is so designed to suit the steel ball size, at an angle of
90°; the mould may be made of tool carbon steel or bearing steel and has
60HRC~65HRC hardness after quenching and tempering.
Appendix C
(Informative)
Decarburized Layer Depth of Bearing Parts after Quenching
and Tempering
See Table C.1 for decarburized layer depth of bearing parts after quenching and
tempering.
JB/T 1255-2014
JB
INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Record Number.
Replacing JB/T 1255-2001
Rolling Bearings - Parts Made from High-carbon
Chromium Bearing Steels -
Specifications for Heat Treatment
Issued on. MAY 6, 2014
Implemented on. OCTOBER 1, 2014
Issued by. Ministry of Industry and Information Technology of the
People’s Republic of China
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Technical Requirements... 6
4 Test Method... 9
Appendix A (Informative) Effective Wall Thickness of Ring and Effective
Diameter of Rollers... 17
Appendix B (Normative) Test Specifications for Crushing Load of Steel
Ball and Crushing Load Values... 19
Appendix C (Informative) Decarburized Layer Depth of Bearing Parts
after Quenching and Tempering... 22
Appendix D (Informative) Allowable Deformation of Bearing Ring after
Quenching and Tempering... 23
Appendix E (Informative) Residual Austenite Content of Bearing Parts
after Quenching and Tempering... 26
Appendix F (Normative) Hardness Correction of Curved Surface... 27
Appendix G (Normative) Acid Cleaning Inspection Specifications... 29
1 Scope
This standard specifies the technical requirements and test methods of the annealed,
quenched and tempered rolling bearing ring and rolling element (hereinafter referred
to as "bearing parts") made from GCr15, GCr15SiMn, GCr15SiMo and GCr18Mo
steels which meet those specified in GB/T 18254-2002.
This standard is applicable to the heat treatment quality test of bearing parts during
process and finished parts made from above-mentioned steels and also applicable to
the heat treatment quality test of bearing parts made from other high-carbon
chromium steels. The bearing parts with special requirements shall be in accordance
with corresponding product drawings.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the dated editions apply. For undated
references, the latest editions (including any amendments) apply.
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1.Test method
(scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1.Test Method
GB/T 1172 Conversion of Hardness and Strength for Ferrous Metal
GB/T 4340.1 Metallic Materials - Vickers Hardness - Part 1.Test Method
GB/T 6394 Metal - methods for Estimating the Average Grain Size
GB/T 17394 Metallic Materials - Leeb Hardness Test
GB/T 18254 High-carbon Chromium Bearing Steel
GB/T 24606 Rolling Bearings - Non-destructive Testing - Magnetic Particle
Testing
JB/T
2974-2004
Rolling Bearings - Identification Code - Supplemental Regulations
JB/T 7361 Rolling Bearings - Test Method for Hardness of Parts
JB/T 7362 Rolling Bearings - Determination of Decarburized depth for Parts
3 Technical Requirements
3.1 Technical requirements of bearing parts after spheroidizing annealing
The technical requirements of bearing parts after spheroidizing annealing shall be in
accordance with those specified in Table 1.
3.2 Technical requirements of bearing parts Martensite after quenching and
tempering
3.2.1 Hardness
The hardness and hardness difference of the same bearing part after quenching and
tempering of Martensite shall be respectively in accordance with those specified in
Table 2 and Table 3.
3.3 Technical requirements of bearing parts Bainite after isothermal quenching
The isothermal quenching structure of bearing parts shall be composed of lower
Bainite and residual carbide, a small quantity of acicular or massive Troostite and
small quantity of residual austenite are allowed. The hardness and microscopic
structure of bearing parts after isothermal quenching shall be in accordance with
those specified in Table 5.
3.4 Other technical requirements
Other technical requirements of bearing parts shall be in accordance with those
specified in Table 6.
4 Test Method
The test method shall be in accordance with those specified in Table 7.
Appendix A
(Informative)
Effective Wall Thickness of Ring and Effective Diameter of
Rollers
See Figure A.1 for the requirements of effective wall thickness of ring and effective
diameter of roller.
Appendix B
(Normative)
Test Specifications for Crushing Load of Steel Ball and
Crushing Load Values
B.1 Scope
This Appendix specifies the test specifications for crushing load of ø3mm~ø50.8mm
steel balls and their crushing load values.
B.2 Test specifications for crushing load of steel ball
B.2.1 Take three groups of heat treated steel balls (nine) from each batch for the
crushing load test and the steel balls shall have the same dimension tolerance.
B.2.2 When the heat treated rerolled steel balls are subjected to the crushing test,
the steel ball surface shall be free from grinding wheel defects, stain, bump or hard
spots, etc.
B.2.9 The tester will vibrate greatly with pointer bounced and reading inaccurate
when the steel balls crush; the attention shall be paid to the load reading when the
steel balls are about to crush.
B.2.10 The crushing mould is so designed to suit the steel ball size, at an angle of
90°; the mould may be made of tool carbon steel or bearing steel and has
60HRC~65HRC hardness after quenching and tempering.
Appendix C
(Informative)
Decarburized Layer Depth of Bearing Parts after Quenching
and Tempering
See Table C.1 for decarburized layer depth of bearing parts after quenching and
tempering.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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