GB/T 10425-2025 Sintered metal friction materials—Determination of apparent hardness

GB/T 10425-2002 Sintered metal friction materials—Determination of apparent hardness

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 230.2-2002 Metallic rockwell hardness test—Part 2:Verification and calibration of hardness testers(scales A,B,C,D,E,F,G,H,K,N,T) GB/T 230.2-2012 Metallic materials—Rockwell hardness test—Part 2:Verification and calibration of testing machines GB/T 230.2-2022 Metallic materials—Rockwell hardness test—Part 2:Verification and calibration of testing machines and indenters 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 231.4-2009 Metallic materials—Brinell hardness test—Part 4:Tables of hardness values GB/T 8170-1987 Rules for rounding off of numberical values GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values JJG 112-2013 Metallic Rockwell Hardness Testing Machines(Scales A,B,C,D,E,F,G,H,K,N,T) JJG 112-2003 Verification Regulation of Metallic Rockwell Hardness Testers(Scales A,B,C,D,E,F,G,H,K,N,T) JJG 150-2005 Metallic Brinell Hardness Testers JJG 884-1994 Plastic Rock Well Hardness Testing Machine