Standard No.:	JB/T 6012.2-2025
English Name:	Internal combustion engine - Intake and exhaust valves - Part 2: Metallographic examination
Chinese Name:	内燃机 进、排气门 第2部分：金相检验
Professional Classification:	JB    Professional Standard - Machinery
Source Content Issued by:	Ministry of Industry and Information Technology
Issued on:	2025-05-09
Implemented on:	2025-11-1
Status:	valid
Superseding:	JB/T 6012.2-2008 Internal combustion engines-Intake and exhaust valves-Part 2:Metallographic inspections
Target Language:	English
File Format:	PDF

本文件规定了内燃机进、排气门金相组织的技术要求，描述了相应的试验方法，规定了金相组织的评定。
本文件适用于气缸直径200mm以下往复活塞式内燃机进/排气门金相组织的检验活动。