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JB/T 6012.2-2008Internal combustion engines - Intake and exhaust valves - Part 2: Metallographic examination (English PDF)

内燃机进、排气门第2部分：金相检验

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Issued by

MIIT

Level / Type

Industry · Recommended

Issue date

February 1, 2008

Implementation date

July 1, 2008

Scope

JB/T 6012.2-2008 is the English-translated version of 内燃机进、排气门第2部分：金相检验.

JB/T 6012.2-2008 is the Chinese standard "Internal combustion engines - Intake and exhaust valves - Part 2: Metallographic examination".

Its scope clause reads: This Part of JB/T 6012 specifies the metallographic structure, inspection method and evaluation of intake and exhaust valves for internal combustion engine (hereinafter referred to as valve).

This part is applicable to the metallographic structure inspection evaluation for reciprocated piston internal combustion engine valves whose cylinder diameter is less than 200mm.

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Document preview — JB/T 6012.2-2008

National Standard of the People's Republic of China

Replacing: JB/T 6720-1993

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Foreword i
1 Scope
2 Normative References
2.1 Matrix Metallographic Structure
2.2 Nitrided Case
2.3 Clad Layer
2.4 Quench Hardening Layer at the Stem End
3 Inspection Method
3.1 Matrix Metallographic Inspection
3.2 Nitrided Case Inspection
3.3 Clad Layer Inspection
3.4 Hardening Layer Depth Inspection at the Stem End
4 Evaluation Standard of Metallographic Structure
4.1 Austenitic Grain Size
4.2 Free Ferrite
4.3 Nitrided Case Looseness and Nitride
4.4 Lamellar Educt

1 Scope

This Part of JB/T 6012 specifies the metallographic structure, inspection method and evaluation of intake and exhaust valves for internal combustion engine (hereinafter referred to as valve).

This part is applicable to the metallographic structure inspection evaluation for reciprocated piston internal combustion engine valves whose cylinder diameter is less than 200mm.

2 Normative References

Provisions of the following documents constitute some provisions of this part of JB/T 6012 through reference. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties who enter into agreement according to these specifications are encouraged to research whether the latest editions of these labels are applied or not. For undated references, the latest editions of the normative documents are applicable to this part.

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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

Cited by

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Editions of JB/T 6012.2

Edition	Title	Revision	Status
JB/T 6012.2-2008	Internal combustion engines - Intake and exhaust valves - Part 2: Metallographic examination	current edition	Current
JB/T 6720-1993	Internal combustion engines - Intake and exhaust valves - Part 2: Metallographic examination	previous edition	Superseded

This page sells the current edition, JB/T 6012.2-2008. Earlier editions are listed for reference only.

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