JB/T 8881-2020Rolling bearings - Parts made from carburizing bearing steels - Specifications for heat treatment (English PDF)
滚动轴承 渗碳轴承钢零件 热处理技术条件
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
August 31, 2020
Implementation date
April 1, 2021
Scope
JB/T 8881-2020 is the English-translated version of 滚动轴承 渗碳轴承钢零件 热处理技术条件.
JB/T 8881-2020 is the Chinese standard "Rolling bearings - Parts made from carburizing bearing steels - Specifications for heat treatment".
Its scope clause reads: This standard specifies the technical requirements and inspection methods for the rolling bearing parts made from carburizing bearing steels such as G15CrMo, G20CrMo, G20CrNiMo, G20CrNi2Mo, G20Cr2Ni4, G10CrNi3Mo, G20Cr2Mn2Mo, and G23Cr2Ni2Si1Mo that conform to the requirements of GB/T 3203-2016 and GB/T 33161-2016 after undergoing pre-carburization conditioning treatment, and post-carburization primary quenching and tempering + high-temperature tempering, secondary quenching and tempering, and bainite isothermal quenching.
This standard applies to the carburizing heat treatment quality inspection of the above-mentioned rolling bearing parts made from carburizing bearing steels (hereinafter referred to as “bearing parts”) as well as those made from low-carbon alloy steels. Its clauses include terms and definitions; technical requirements.
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Document preview — JB/T 8881-2020
National Standard of the People's Republic of China
- Replacing
- JB/T 8881-2011
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword II
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Technical requirements
- 4.1 Technical requirements for pre-carburization conditioning treatment
- 4.2 Technical requirements for carburizing heat treatment
- 5 Inspection methods
- Annex A (Normative) Methods for measuring case-hardened depth
- A.1 Hardness method
- A.2 Macro-fracture method
- A.3 Micro-structure analysis method
- Annex B (Normative) Procedure for dye penetrant testing
- B.1 Scope
- B.2 Defect display and determination
- B.3 Materials for testing and sensitivity verification
- B.4 Requirements for testing surface of bearing parts
- B.5 Operating method
- B.6 Inspection
- Bibliography
- Figure 1 Diagram for measuring the depth of coarse carbides in carburized surface layer
- Figure 2 First-rating diagram (coarse carbides in carburized surface layer)
- Figure 3 Second-rating diagram (network carbides in carburized case)
- Figure 7 Sixth-rating diagram (core micro-structure)
- Table 1 Case-hardened depth
- Table 2 Surface hardness and surface layer micro-structure
- Table 3 Core hardness and core micro-structure
- Table 4 Permissible deformation of bearing rings after carburizing heat treatment
- Table 5 Inspection methods
1 Scope
This standard specifies the technical requirements and inspection methods for the rolling bearing parts made from carburizing bearing steels such as G15CrMo, G20CrMo, G20CrNiMo, G20CrNi2Mo, G20Cr2Ni4, G10CrNi3Mo, G20Cr2Mn2Mo, and G23Cr2Ni2Si1Mo that conform to the requirements of GB/T 3203-2016 and GB/T 33161-2016 after undergoing pre-carburization conditioning treatment, and post-carburization primary quenching and tempering + high-temperature tempering, secondary quenching and tempering, and bainite isothermal quenching.
This standard applies to the carburizing heat treatment quality inspection of the above-mentioned rolling bearing parts made from carburizing bearing steels (hereinafter referred to as “bearing parts”) as well as those made from low-carbon alloy steels.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 230.1-2018 Metallic materials - Rockwell hardness test - Part 1: Test method
GB/T 231.1-2018 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 4340.1-2009 Metallic materials - Vickers hardness test - Part 1: Test method
GB/T 6394-2017 Determination of estimating the average grain size of metal
GB/T 9450-2005 Steels - Determination and verification of the depth of carburized and hardened cases
GB/T 24606-2009 Rolling bearings - Non-destructive testing - Magnetic particle testing
GB/T 34891-2017 Rolling bearings - Parts made from high-carbon chromium bearing steels - Specifications for heat treatment
JB/T 7361-2007 Rolling bearings - Test method for hardness of parts
3 Terms and definitions
3.1
case-hardened depth (of a carburized and hardened case) vertical distance from the surface of the part to the point where the Vickers hardness value is 550HV1
[GB/T 9450-2005, Clause 3 “Definitions”]
4 Technical requirements
4.1 Technical requirements for pre-carburization conditioning treatment
4.1.1
Bearing parts shall be subjected to conditioning treatment before carburization, and their hardness after conditioning treatment shall not be greater than 229HBW (the indentation diameter shall not be less than 4mm); the hardness of parts made from G20Cr2Ni4 steel after conditioning treatment shall not be greater than 241HBW (the indentation diameter shall not be less than 3.9mm).
4.1.2
The average grain size of bearing parts before carburization shall comply with Grade 5 or finer grain size grade stipulated in GB/T 6394-2017.
4.2 Technical requirements for carburizing heat treatment
4.2.1 Case-hardened depth
The case-hardened depth of finished parts after carburizing heat treatment shall meet those specified in Table 1.
Table 1 Case-hardened depth […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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- GB/T 25763-2024Rolling bearings - Needle roller bearings for automotive transmissions
- GB/T 25764-2024Rolling bearings - Roller bearings for automotive transmissions
- JB/T 11086-2011Rolling bearings - Overrunning clutches for motorcycles
- JB/T 8563-2010Rolling bearings - Water pump bearings
- JB/T 8568-2010Rolling bearings - Cylindrical roller bearing track rollers for conveying chains
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Editions of JB/T 8881
| Edition | Title | Revision | Status |
|---|---|---|---|
| JB/T 8881-2020 | Rolling bearings - Parts made from carburizing bearing steels - Specifications for heat treatment | current edition | Current |
| JB/T 8881-2011 | Rolling bearings - Parts made from carburizing bearing steels - Specifications for heat treatment | previous edition | Superseded |
This page sells the current edition, JB/T 8881-2020. Earlier editions are listed for reference only.
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