DL/T 884-2004 Power plant metallography inspection and assessment guideline

DL/T 884-2019 Guidelines for Microstructure Inspection and Evaluation in Power Plants

DL/T 439-2018 High-temperature fasteners technology guidelines for coal-fired power plants DL/T 439-2006 High-temperature fasteners technology guidelines for coal-fired power plants DL/T 674-1999 The gradational standard of spherular pearlite for carbon steel No.20 used in fossil power plant DL/T 773-2016 The ballasting grading standard for 12Cr1MoV steel used in coal-fired power plants DL/T 773-2001 The ballasting grading standard for 12Cr1MoV steel used in coal-fired power plants DL/T 787-2001 The pearlite grain-refining grading standard for 15CrMo steel used in coal-fired power plants GB/T 13298-1991 Metal—Inspection method of microstructure GB/T 13298-2015 Inspection methods of microstructure for metals GB/T 13299-1991 Steel—Determination of microstructure GB/T 13299-2022 Determination of free cementite,pearlite and Widmanstaten structure in steel GB/T 1979-2001 Standard diagrams for macrostructure and defect of structural steels GB/T 226-1991 Etch test for macrostructure and defect of steels GB/T 226-2015 Test method for macrostructure and defect of steel by etching GB/T 4236-1984 Steel—Examination by sulphur print (Baumann method) GB/T 4236-2016 Steel examination by sulphur print (Baumann method) GB/T 6394-2002 Metal-methods for estimating the average grain size GB/T 6394-2017 Determination of estimating the average grain size of metal YB 47 GB/T 1979-2025 Evaluation of macrostructural defects in structural steels—Acid etching method and ultrasonic testing method GB/T 4236-2025 Steel-examination by sulphur print