Standard No.:	GB/T 13305-2008
English Name:	Micrographic method for determining area content of the α-phases in stainless steels
Chinese Name:	不锈钢中α－相面积含量金相测定法
Chinese Classification:	H24    Metallographic testing method
Professional Classification:	GB    National Standard
ICS Classification:	77.040.99 77.040.99    Other methods of testing of metals 77.040.99
Issued by:	AQSIQ; SAC
Issued on:	2008-8-19
Implemented on:	2009-4-1
Status:	to be abolished
Superseded by:	GB/T 13305-2024 Method for determining content of the α-phase in stainless steels
Superseded on:	2024-12-1
Abolished on:	2024-12-01
Superseding:	GB/T 6401-1986 Micrographic method for determining area fraction of the alpha-phases using charts in ferritic-austenitic stainless steels GB/T 13305-1991 Austenitic stainless steels－Determination of area content of the α-phase－Micrographic method using STANDARD diagrams
Language:	English
File Format:	PDF
Word Count:	9000 words
Price(USD):	140.0
Delivery:	via email in 1~3 business day

本标准是对GB/T 6401-1986《铁素体奥氏体双相不锈钢中α-相面积含量金相测定法》和GB/T 13305-1991《奥氏体不锈钢中α-相面积含量金相测定法》两项标准的整合修订。
本标准规定了金相法测定不锈钢中α-相面积含量的试样的选取与制备、测定方法和试验报告等。
本标准适用于金相法测定奥氏体不锈钢和铁素体奥氏体双相不锈钢中α-相面积含量。
本标准代替GB/T 13305-1991和GB/T 6401-1986相比主要变化如下：
———标准名称修改为：不锈钢中α相面积含量金相测定法；
———3.1增加“试样应在冷状态下用机械方法切取，若用气割或热切等方法切取时，必须将金属熔化区、塑性变形区和热影响区完全去除。切割面和检查面之间的距离视切割方法而定，一般不小于0.5mm”；
———3.2增加“c）氯化铁盐酸乙醇水溶液”和“d）NaOH或KOH电解液”；
———4.1.2增加铁素体奥氏体双相不锈钢中α-相面积含量的测定法；
———增加“4.2金相图像软件定量分析法”；
———5增加“c选取的试验方法”。