Standard No.:	YB 4002-1991
Chinese Name:	连铸钢方坯低倍组织缺陷评级图
Chinese Classification:	H24    Metallographic testing method
Professional Classification:	YB    Professional Standard - Metallurgy
Source Content Issued by:	Ministry of Metallurgical Industry
Issued on:	1991-05-04
Implemented on:	1992-1-1
Status:	superseded
Superseded by:	YB/T 4002-2013 Standard Diagrams for Macrostructure and Defects in Continuous Casting Billets
Superseded on:	2013-9-1
Target Language:	English
File Format:	PDF
Word Count:	10000 words
Translation Price(USD):	300.0
Delivery:	via email in 1~5 business day

本标准规定了连铸钢方坯低倍组织和缺陷形貌特征、产生原因和评级原则。
本标准适用于评定采用连铸工艺生产的碳素钢用低合金钢等主坯横截面酸蚀倍组织的缺陷。方坯横截面尺寸范围边90~200mm；矩形坯也可参照使用。
本标准评级图中各类缺陷是否允许存在以及合格级别，应在相应的技术标准或双方协议中规定。