QC/T 262-1999 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| QC/T 262-1999 | English | 170 |
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Metallographic Test of Car Carburizing Gear
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QC/T 262-1999: PDF in English (QCT 262-1999) QC/T 262-1999
QC
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing ZB T04 001-88
Metallographic Test of Car Carburizing Gear
APPROVED ON. MARCH 15, 1999
IMPLEMENTED ON. MARCH 15, 1999
Approved by. State Bureau of Machine Building Industry
Table of Contents
1 Theme Contents and Applicable Scope . 3
2 Normative References . 3
3 Terms .. 3
4 Specimen Requirements . 4
5 Technical Requirements .. 4
6 Structure Levels . 4
Additional Information... 10
Metallographic Test of Car Carburizing Gear
1 Theme Contents and Applicable Scope
1.1 This Standard specifies the definitions and test methods of metallographic
structure, effective layer depth of carburized case for the car steel carburizing gear.
1.2 This Standard is applicable to the car gear with effective depth of carburized and
hardened case greater than 0.3mm.
1.3 This Standard is applicable to the quality inspection of gear after finishing all the
heat treatment procedures.
2 Normative References
GB/T 9450 Steels - Determination and Verification of the Depth of Carburized and
Hardened Cases
GB/T 8539 General Specification for Quality Inspection of Gear Materials and
Their Heat Treatment
3 Terms
3.1 Surface hardness
The surface hardness near the pitch circle in the center of tooth-width.
3.2 Center hardness
The hardness, on the cross-section in the center of tooth-width, and on the intersecting
position between tooth centerline and tooth root circle (see Schematic diagram).
3.3 Effective depth of carburized and hardened case
From the tooth surface, the vertical distance under 9.81N (1kgf) load measured to
550HV, or under 49.03N (5kgf) load measured to 515HV.
4 Specimen Requirements
4.1 When preparing the specimen, no phenomenon such as the structure changes
due to heat shall occur.
4.2 When measuring the effective depth of carburized and hardened case, the tested
surface shall be parallel to the working stage of hardness machine.
5 Technical Requirements
5.1 The effective depth of carburized and hardened case shall abide by the product
drawing, and be subject to the tooth root and pitch circle positions; while its test method
shall conform to the provisions of GB/T 9450; the decrease to the center hardness
shall conform to the provisions of GB/T 8539.
5.2 The carbon content on the surface course is recommended to be 0.8%~1.0%.
5.3 Carbide
Inspect under the magnification of 400×; the inspection position shall be subject to the
addendum angle and working surface; evaluate as per the carbide level diagram in
this Standard. The constantly meshed gear is qualified for Level 1~Level 5; while
shifting gear is qualified for Level 1~Level 4.
5.4 Residual austenite and martensite
Inspect under the magnification of 400×; the inspection position shall be subject to
surface near pitch circle and tooth root; separately evaluate as per the residual
austenite and martensite level diagram; it is qualified for Level 1~Level 5.
5.5 Surface hardness is HRC 58~63, the center hardness shall be specified by the
product drawing.
5.6 If the surface is not martensite structure; the maximum depth shall not exceed
0.02mm.
6 Structure Levels
6.1 The carbide levels shall be determined as per its shape, quantity, size, distribution
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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