Standard No.:	JB/T 6012.2-2008
Chinese Name:	内燃机 进、排气门 第2部分：金相检验
English Name:	Internal combustion engines-Intake and exhaust valves-Part 2:Metallographic inspections
Professional Classification:	J93 Air intake/exhaust system
Professional Classification:	JB Professional Standard - Machinery
ICS Classification:	27.020
Issued by:
Issued on:	2008-02-01
Implemented on:	2008-07-01
Status:	VALID
Replace:	JB/T6720－1993
Language:	English
File Format:	PDF
Word Count:	4000 words
Price(USD):	120 (USD)
Delivery:	via email in 1-3 business day

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.