GB/T 24187-2023 Cold-drawn precision single welded steel tubes

GB/T 24187-2009 Cold-drawn precision single welded steel tubes

GB/T 228.1-2021 Metallic materials—Tensile testing—Part 1:Method of test at room temperature 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 223.5-1997 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 223.59-2008 Iron,steel and alloy—Determination of phosphorus content—Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method GB/T 223.63-1988 Methods for chemical analysis of iron,steel and alloy—The sodium(potassium)periodate photometric method for the determination of manganese content GB/T 223.63-2022 Iron,steel and alloy—Determination of manganese content—Sodium(potassium) periodate spectrophotometric method GB/T 223.85-2009 Steel and iron—Determination of sulfur content—Infrared absorption method after combustion in an induction furnace GB/T 223.86-2009 Steel and iron—Determination of total carbon content—Infrared absorption method after combustion in an induction furnace GB/T 241-1990 Metal tubes—Hydrostatic pressure testing GB/T 241-2007 Metal materials—Tube—Hydrostatic pressure test GB/T 242-1997 Metallic materials—Tube—Drift expanding test GB/T 242-2007 Metal materials—Tube—Drift-expending test GB/T 244-1997 Metallic materials—Tube—Bend test GB/T 244-2008 Metallic materials-tube—Bend test GB/T 244-2020 Metallic materials—Tube—Bend test method GB/T 246-1997 Metallic materials—Tube—Flattening test GB/T 246-2007 Metal materials—Tube—Flattening test GB/T 246-2017 Metallic materials—Tube—Flattening test GB/T 2102-1988 Acceptance, packing, marking, and certification of pipe GB/T 2102-2006 Acceptance, packing, marking and quality certification of steel pipe GB/T 2102-2022 Acceptance,packaging,marking and quality certification for steel tubular products GB/T 2423.22-2002 Environmental testing for electric and electronic products—Part 2:Test methods Test N:Change of temperature GB/T 2423.22-2012 Environmental testing—Part 2:Test methods—Test N:Change of temperature GB/T 2975-1998 Steel and steel products—Location and preparation of test pieces for mechanical testing GB/T 2975-2018 Steel and steel products—Location and preparation of samples and test pieces for mechanical testing 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 7141-1992 Plastics—Methods of exposure to thermal air GB/T 7141-2008 Plastics—Methods of heat aging GB/T 10125-1997 Corrosion tests in artificial atmospheres—Salt spray tests GB/T 10125-2012 Corrosion tests in artificial atmospheres—Salt spray tests GB/T 10125-2021 Corrosion tests in artificial atmospheres—Salt spray tests GB/T 11547-1989 Plastics—Determination of the effects of liquid chemicals, including water GB/T 11547-2008 Plastic—Methods of test for the determination of the effects of immersion in liquid chemicals GB/T 11605-2005 Methods of humidity measurement GB/T 16422.3-1997 Plastics—Methods of exposure to laboratory light sources—Part 3:Fluorescent UV lamps GB/T 16422.3-2014 Plastics—Methods of exposure to laboratory light sources—Part 3:Fluorescent UV lamps GB/T 16422.3-2022 Plastics—Methods of exposure to laboratory light sources—Part 3:Fluorescent UV lamps GB/T 20066-2006 Steel and iron—Sampling and preparation of samples for the determination of chemical composition GB/T 20123-2006 Steel and iron—Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method) GB/T 20126-2006 Unalloyed Steel—Determination of low carbon content—Part 2:Infrared absorption method after combustion in an induction furnace(With preheating) GB/T 30062-2013 Terminology of steel pipes and tubes HJ 637-2012 Water quality determination of oil and animal/vegetable fats by infrared spectrophotometry HJ 637-2018 Water quality determination of oil and animal/vegetable fats by infrared spectrophotometry GB/T 241-2025 Metallic materials—Tube—Hydrostatic pressure test GB/T 222-2025 Steels and alloys—Permissible deviations of product analyzed chemical composition