JB/T 8118.2-2011Internal combustion engines - Piston pins - Part 2: Metallographic examination (English PDF)
内燃机 活塞销 第2部分：金相检验
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
May 18, 2011
Implementation date
August 1, 2011
Scope
JB/T 8118.2-2011 is the English-translated version of 内燃机 活塞销 第2部分：金相检验.
JB/T 8118.2-2011 is the Chinese standard "Internal combustion engines - Piston pins - Part 2: Metallographic examination".
Its scope clause reads: This part of JB/T 8118 specifies the technical requirements, inspection and evaluation methods, and grades of metallographic structure of carburized layer depth and metallographic structure of piston pins of internal combustion engines made of 20, 15Cr, 20Cr or 20Mn2 steel after heat treatment.
This part is applicable to the inspection for carburized layer depth and metallographic structure of piston pin of reciprocating internal combustion engine with cylinder diameter less than 200mm. Its clauses include technical requirements.
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Document preview — JB/T 8118.2-2011
National Standard of the People's Republic of China
- ICS
- 27.020
- Replacing
- JB/T 8118.2-1999
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Technical requirements
- 3.1 Carburized layer depth
- 3.2 Hardened layer depth
- 3.3 Metallographic structure of carburized and hardened layer on outer surface
- 3.4 Full decarbonization and carbon depletion on inner hole surface
- 4 Inspection and evaluation methods
- 4.1 Sampling position and erosion
- 4.2 Measurement of carburized layer depth
- 4.3 Inspection and evaluation of martensite
- 4.4 Inspection and evaluation of carbide
- 4.5 Inspection and evaluation of full decarbonization and carbon depletion on inner hole surface
- 5 Grades of metallographic structure
- 5.1 Grades of martensite
- 5.2 Grades of carbide
1 Scope
This part of JB/T 8118 specifies the technical requirements, inspection and evaluation methods, and grades of metallographic structure of carburized layer depth and metallographic structure of piston pins of internal combustion engines made of 20, 15Cr, 20Cr or 20Mn2 steel after heat treatment.
This part is applicable to the inspection for carburized layer depth and metallographic structure of piston pin of reciprocating internal combustion engine with cylinder diameter less than 200mm.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of JB/T 8118. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest editions apply to this part.
JB/T 8118-1997 (2009) Internal combustion engines - Piston pins - Technical specification
3 Technical requirements
3.1 Carburized layer depth
3.1.1
The carburized layer depth is the hypereutectoid layer plus 1/2 transition layer of the eutectoid layer.
3.1.2
The carburized layer depth shall be in accordance with JB/T 8118-1997, 4.3.2.
3.1.3
For the outer surface with the carburized layer depth not greater than 0.6mm, the sum of the hypereutectoid layer plus the eutectoid layer shall account for 25% to 70% of the carburized layer depth, and no eutectoid layer is allowed.
3.2 Hardened layer depth
3.2.1
The hardened layer depth is the vertical distance from the outer surface of piston pin to the specified inside hardness value position. For quality carbon structure steel, the limit hardness value is 550HV0.2; for alloy structure steel, the limit hardness value is 500HV0.2.
3.2.2
The hardened layer depth shall be in accordance with JB/T 8118-1997 (2009), 4.3.3.
......
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
Similar standards
Editions of JB/T 8118.2
| Edition | Title | Revision | Status |
|---|---|---|---|
| JB/T 8118.2-2011 | Internal combustion engines - Piston pins - Part 2: Metallographic examination | current edition | Current |
| JB/T 8118.2-1999 | Internal combustion engines - Piston pins - Part 2: Metallographic examination | previous edition | Superseded |
This page sells the current edition, JB/T 8118.2-2011. Earlier editions are listed for reference only.
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Related Standards
JB/T 8118-1997 — Piston pins for internal combustion engines - Technical specifications
JB/T 8118.3-2011 — Internal combustion engines - Piston pins - Part 3: Magnetic particle testing
JB/T 8118.3-1999 — Internal combustion engines - Piston pins - Technical specifications for magnetic particle inspection
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JB/T 8118.2-2011
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