GB/T 1301-2008 Hollow drill steels for rock drilling

GB/T 1301-1994 Rock drilling equipment—Hollow drill steels in bar form

GB/T 1301-2025 Hollow drill steels for rock drilling

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 223.11-1991 Methods for chemical analysis of iron, steel and alloy The ammonium persulfate oxidation volumetric method for the determination of chromium content GB/T 223.11-2008 Iron,steel and alloy—Determination of chromium content—Visual titration or potentiometric titration method GB/T 223.14-2000 Methods for chemical analysis of iron,steel and alloy The N-benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content GB/T 223.23-1994 Methods for chemical analysis of iron, steel and alloy—The dimethylglyoxime spectrophotometric method for the determination of nickel content GB/T 223.23-2008 Iron,steel and alloy—Determination of nickel content—The dimethylglyoxime spectrophotometric method GB/T 223.25-1994 Methods for chemical analysis of iron, steel and alloy The dimethylglyoxime gravimetric method for the determination of nickel content GB/T 223.26-1989 Methods for chemical analysis of iron, steel and alloy The thiocyanate direct photometric method for the determination of molybdenum content GB/T 223.26-2008 Iron,steel and alloy—Determination of molybdenum content—The thiocyanate spectrophotometric method GB/T 223.60-1997 Methods for chemical analysis of iron,steel and alloy—The perchloric acid dehydration gravimetric method for the determination of silicon content GB/T 223.60-2024 Iron,steel and alloy—Determination of silicon content—Gravimetric method GB/T 223.62-1988 Methods for chemical analysis of iron,steel and alloy—The butyl acetate extraction photometric method for the determination of phosphorus content 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 223.68-1997 Methods for chemical analysis of iron,steel and alloy The potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content GB/T 223.71-1997 Methods for chemical analysis of iron,steel and alloy—The gravimetric method after combustion in the pipe furnace for the determination of carbon content GB/T 223.75-1991 Methods for chemical analysis of iron, steel and alloy—The methanol distillation-curcumin photometric method for the determination of boron content GB/T 223.75-2008 Iron,steel and alloy—Determination of boron content—Methanol distillation-curcumin photometric 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 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 2101-1989 General requirements of acceptance, packaging, marking and certification for section steel GB/T 2101-2008 General requirement of acceptance,packaging,marking,and certification for section steel GB/T 2101-2017 General requirement of acceptance,packaging,marking and certification for section steel 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 20066-2006 Steel and iron—Sampling and preparation of samples for the determination of chemical composition GB/T 223.53-1987 Methods for chemical analysis of iron，steel and alloy--The flame atomic absorption spectrophotometric method for the determination of copper content GB/T 222-2025 Steels and alloys—Permissible deviations of product analyzed chemical composition GB/T 223.11-2025 Iron, steel and alloy—Determination of chromium content—Titrimetric method and spectrophotometric method

ISO 722:1991