DIN EN ISO 17781:2017-11
石油、石化和天然气工业-铁素体/奥氏体(双相)不锈钢微观结构质量控制测试方法
Petroleum, petrochemical and natural gas industries - Test methods for quality control of microstructure of ferritic/austenitic (duplex) stainless steels (ISO 17781:2017); English version EN ISO 17781:2017