JB/T 4202-2008 Remaining heat from forging for quenching and tempering of steel

JB/T 4202-1999 The forging, heat treatment, and quenching and tempering of steel

GB/T 1220-1992 Stainless steel bars GB/T 1220-2007 Stainless steel bars GB/T 1222-1984 Spring steel GB/T 1222-2007 Spring steels GB/T 1222-2016 Spring steels GB/T 1298-1986 Carbon tool steels—Technical requirements GB/T 1298-2008 Carbon tool seels GB/T 1299-2000 Alloy tool steels GB/T 1299-2014 Tool and mould steels GB/T 16924-1997 Quenching and tempering of steel parts GB/T 16924-2008 Quenching and tempering of steel parts GB/T 18254-2002 High-carbon chromium bearing steel GB/T 18254-2016 High-carbon chromium bearing steel GB/T 224-1987 Determination of depth of decarburization of steel GB/T 224-2008 Determination of depth of decarburization of steels GB/T 224-2019 Determination of the depth of decarburization of steels GB/T 228-2002 Metallic materials—Tensile testing at ambient temperature GB/T 230.1-2004 Metallic Rockwell hardness test—Part1:Test method(scales A、B、C、D、E、F、G、H、K、N、T) GB/T 230.1-2009 Metallic materials—Rockwell hardness test—Part 1:Test method(scales A、B、C、D、E、F、G、H、K、N、T) GB/T 230.1-2018 Metallic materials—Rockwell hardness test—Part 1: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 3203-1982 Specification for carburizing steels of bearings GB/T 3203-2016 Carburizing steels for bearing GB/T 4340.1-1999 Metallic materials—Vickers hardness test—Part 1:Test method GB/T 4340.1-2009 Metallic materials—Vickers hardness test—Part 1:Test method GB/T 4340.1-2024 Metallic materials—Vickers hardness test—Part 1:Test 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 GB/T 699-1999 Quality carbon structural steels GB/T 699-2015 Quality carbon structure steels GB/T 9943-1988 High speed tool steel bars—Technical requirements GB/T 9943-2008 High-speed tool steels GB/T 1299-2025 Tool and mould steels GB/T 1222-2025 Spring steels GB/T 9943-2025 High-speed tool steels