GB 4351.2-2005 Portable fire extinguishers—Part 2:Requirements for seamless steel cylinders of portable carbon dioxide fire extinguishers

GB 4351.1-2005 Portable fire extinguishers—Part 1:Performance and construction GB/T 4351.3-2005 Portable fire extinguishers—Part 3:Regulations

GB 4351-1997 General specifications for portable fire extinguishers

GB 4351-2023 Portable fire extinguishers

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 222-2025 Steels and alloys—Permissible deviations of product analyzed chemical composition GB/T 223.1~223.7 GB/T 223.1~223.7 GB/T 223.3-1988 Methods for chemical analysis of iron, steel and alloy—The diantipyryl methane phosphomolybdate gravimetric method for the determination of phosphorus content GB/T 223.4-1988 Methods for chemical analysis of iron, steel and alloy The volumetric method for determination of manganese content by ammonium nitrate oxidation GB/T 223.4-2008 Alloyed steel—Determination of manganese content—Potentiometric or visual titration method GB/T 223.5-1997 Methods for chemical analysis of iron,steel and alloy—The reduced molybdosilicate spectro photometric method for the determination of acid-soluble silicon content GB/T 223.5-2008 Steel and iron—Determination of acid-soluble silicon and total silicon content—Reduced molybdosilicate spectrophotometric method GB/T 223.6-1994 Methods for chemical analysis of iron, steel and alloy—The neutralization titrimetric method for the determination of boron content GB/T 223.6-2025 Iron,steel and alloy—Determination of boron content—Neutralization titrimetric method and spectrophotometric method GB/T 223.7-2002 Iron powder—Determination of iron content—Potassium dichromate titration method 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 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 228-2002 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 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 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 230.3-2002 Metallic rockwell hardness test—Part 3:Calibration of hardness reference blocks(scales A,B,C,D,E,F,G,H,K,N,T) GB/T 230.3-2012 Metallic materials—Rockwell hardness test—Part 3:Calibration of reference blocks(scales A,B,C,D,E,F,G,H,K,N,T) GB/T 230.3-2022 Metallic materials—Rockwell hardness test—Part 3:Calibration of reference blocks 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 232-1999 Metallic materials—Bend test GB/T 232-2010 Metallic materials—Bend test GB/T 232-2024 Metallic materials—Bend testing method GB/T 1979-2001 Standard diagrams for macrostructure and defect of structural steels GB/T 1979-2025 Evaluation of macrostructural defects in structural steels—Acid etching method and ultrasonic testing method GB/T 5777-1996 Seamless steel pipe and tubing—Methods for ultrasonic testing GB/T 5777-2008 Seamless steel pipe and tubing methods for ultrasonic testing GB/T 5777-2019 Automated full peripheral ultrasonic testing of seamless and welded(except submerged arc-welded) steel tubes for the detection of longitudinal and/or transverse imperfections 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 8335-1998 Special threads for gas cylinders GB/T 8335-2011 Special threads for gas cylinders GB/T 9251-1997 Method for hydraulic test of gas cylinders GB/T 9251-2011 Methods for hydrostatic test of gas cylinders GB/T 9251-2022 Methods for hydrostatic test of gas cylinders GB/T 9252-2001 Method for cycling test of gas cylinders GB/T 9252-2017 Method for pressure cycling test of gas cylinders 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 13440-1992 Method for flattening test of seamless gas cylinders GB 13447-1992 Steel blank for seamless gas cylinder GB/T 13447-2008 Steel blank for seamless gas cylinder GB 15385-1994 Method for hydraulic burst test of gas cylinders GB/T 15385-2011 Method for hydraulic burst test of gas cylinder GB/T 15385-2022 Method for hydraulic burst test of gas cylinder GB 18248-2000 Seamless steel tubes for gas cylinder GB/T 18248-2008 Seamless steel tubes for gas cylinder GB/T 18248-2021 Seamless steel tubes for gas cylinder