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

Standard No.

JB/T 6012.2-2008

Language

Chinese, Available in English version

Release Date

2008

Published By

Professional Standard - Machinery

Latest

JB/T 6012.2-2008

Replace

JB/T 6720-1993

Scope

This part of JB/T 6012 specifies the metallographic structure, inspection methods and evaluation of the intake and exhaust valves of internal combustion engines (hereinafter referred to as valves). This section is applicable to the evaluation of the metallographic structure inspection of reciprocating piston internal combustion engine valves with a cylinder diameter of less than 200 mm.

JB/T 6012.2-2008 Referenced Document

• GB/T 11354 Determination of nitrided case depth and metallographic microstructure examination for steel & iron parts
• GB/T 1299 Tool and mould steels*， 2014-12-05 Update
• GB/T 5617 Determination of effective depth of hardening after induction or flame hardening of steel
• GB/T 6394 Determination of estimating the average grain size of metal*， 2017-02-28 Update
• GB/T 9451 Determination of total or effective thickness of thin surface hardened layers of steel parts
• JB/T 6012 Internal combustion engines - Intake and exhaust valves - Specification

JB/T 6012.2-2008 history

• 2008 JB/T 6012.2-2008 Internal combustion engines.Intake and exhaust valves.Part 2: Metallographic inspections
• 1993 JB/T 6720-1993 Metallographic inspection of intake and exhaust valves of internal combustion engines

JB/T 6012.2-2008 Internal combustion engines.Intake and exhaust valves.Part 2: Metallographic inspections has been changed from JB/T 6720-1993 Metallographic inspection of intake and exhaust valves of internal combustion engines.