GB/T 25715-2023 Pipe mould for centrifugal ductile iron pipe

GB/T 25715-2010 Sphere nodular cast pipe mold finish machining project

GB/T 1184-1996 Geometrical tolerancing—Geometrical tolerance for features without individual tolerance indications GB/T 1804-2000 General tolerances for linear and angular dimensions without individual tolerance indications GB/T 6394-2017 Determination of estimating the average grain size of metal GB/T 10561-2005 Steel—Determination of content of nonmetallic inclusions—Micrographic method using standards diagrams GB/T 13384-2008 General specifications for packing of mechanical and electrical product GB/T 37400.15-2019 Heavy mechanical general technical specification—Part 15:Nondestructive test of steel forgings GB/T 222-1984 Method of sampling steel for determination of chemical composition and permissible variations for product analysis GB/T 222-2006 Permissible tolerances for chemical composition of steel products GB/T 223.82-2007 Steel and iron—Determination of hydrogen content—Inert gas impulse fusion heat conductivity method GB/T 223.82-2018 Steel and iron—Determination of hydrogen content—Thermal conductivity/infrared method after fusion under inert gas 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 228.1-2010 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 228.1-2021 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 229-1994 Metallic materials—Charpy notch impact test GB/T 229-2007 Metallic materials—Charpy pendulum impact test method GB/T 229-2020 Metallic materials—Charpy pendulum impact test method GB/T 231.1-2002 Metallic materials—Brinell hardness test—Part 1:Test method GB/T 231.1-2009 Metallic materials—Brinell hardness test—Part 1:Test method GB/T 231.1-2018 Metallic materials—Brinell hardness test—Part 1:Test method GB/T 4336-2002 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-Alloy steel(routine method) GB/T 4336-2016 Carbon and low-alloy steel—Determination of multi-element contents—Spark discharge atomic emission spectrometric method (routine method) GB/T 11261-1989 Methods for chemical analysis of high carbon chromium bearing steel The pulse heating inert gas fusion-infra red absorption method for the determination of oxygen content GB/T 11261-2006 Steel and iron—Determination of oxygen content—The pulse heating inert gas fusion-infra-red absorption method GB/T 13295-2003 Ductile iron pipes,fittings and accessories for water or gas applications GB/T 13295-2008 Ductile iron pipes,fittings and accessories for water or gas applications GB/T 13295-2013 Ductile iron pipes,fittings and accessories for water or gas applications GB/T 13295-2019 Ductile iron pipes,fittings and accessories for water or gas applications GB/T 13320-1991 Metallographic grading atlas and assessing method for steel die forgings GB/T 13320-2007 Metellographic grading atlas and assessing method for steel die forgings GB/T 20066-2006 Steel and iron—Sampling and preparation of samples for the determination of chemical composition GB/T 20124-2006 Steel and iron—Determination of nitrogen content—Thermal conductimetric method after fusion in a current of inert gas (Routine method) GB/T 1979-2001 Standard diagrams for macrostructure and defect of structural steels GB/T 222-2025 Steels and alloys—Permissible deviations of product analyzed chemical composition GB/T 13320-2025 Metellographic grading atlas and assessing method for steel die forgings