GB/T 12225-1989 General purpose industrial valves—Specification of copper alloy castings

GB/T 12225-2005 General purpose industrial valves—Specification of copper alloy castings

GB 4981 GB 6397 JB 2121 GB/T 228-2002 Metallic materials—Tensile testing at ambient temperature 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 228.2-2015 Metallic materials—Tensile testing—Part 2:Method of test at elevated temperature GB/T 228.3-2019 Metallic materials—Tensile testing—Part 3:Method of test at low temperature GB/T 228.4-2019 Metallic materials—Tensile testing—Part 4:Method of test in liquid helium 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 231.2-2002 Metallic Brinell hardness test—Part 2:Verification and calibration of hardness testers GB/T 231.2-2012 Metallic materials—Brinell hardness test—Part 2:Verification and calibration of testing machines GB/T 231.2-2022 Metallic materials—Brinell hardness test—Part 2:Verification and calibration of testing machines GB/T 231.3-2002 Metallic Brinell hardness test—Part 3:Calibration of hardness reference blocks GB/T 231.3-2012 Metallic materials—Brinell hardness test—Part 3:Calibration of reference blocks GB/T 231.3-2022 Metallic materials—Brinell hardness test—Part 3:Calibration of reference blocks GB/T 231.4-2009 Metallic materials—Brinell hardness test—Part 4:Tables of hardness values GB/T 1176-1987 Specification for cast copper alloys GB/T 1176-2013 Casting copper and copper alloys