Standard No.:	TB/T 2255-1991
English Name:	High Phosphorous Cast Iron Metallography
Chinese Name:	高磷铸铁金相
Chinese Classification:	S39    Locomotive repair technology and equipment
Professional Classification:	TB    Professional Standard - Railway Transport
Issued by:	Ministry of Railways
Issued on:	1992-5-6
Implemented on:	1992-10-1
Status:	superseded
Superseded by:	TB/T 3104.3-2017
Superseded on:	2018-5-1
Language:	English
File Format:	PDF
Word Count:	7000 words
Price(USD):	210.00
Delivery:	via email in 1~3 business day

本标准规定用光学显微镜对高磷铸铁石墨分布形状、石墨长度、珠光体片间距、铁素体数量、磷共晶网孔继续状况、磷工晶分布形状、磷共晶类型和金相异常组织的评定方法，并列出评级图。
本标准适用于含磷量为1.0～3.0%铸铁的显微组织检验。