1 Scope
This national standard specifies classification, code name, dimension, shape, weight, technical requirements, specimen, test methods, test rules, packaging, mark and quality certificate.
This standard is applicable to seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes used as pipelines.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 222 Allowable deviation of steel product analysis
GB/T 223.5 Steel: reduced silicomolybdate spectrophotometric method for the determination of the acid soluble silicon and all silicon content
GB/T 223.10 Chemical analysis method for steel and alloy: the cupferron separation-chrome azurol S photometric method for the determination of aluminum content
GB/T 223.11 Chemical analysis method for steel and alloy: the ammonium persulfate oxidation volumetric method for the determination of chromium content
GB/T 223.12 Chemical analysis method for steel and alloy: the sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content
GB/T 223.13 Chemical analysis method for steel and alloy: the ammonium ferrous sulfate titration method for the determination of vanadium content
GB/T 223.14 Chemical analysis method for steel and alloy: the N-benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content
GB/T 223.16 Chemical analysis method for steel and alloy: the chromotropic acid photometric method for the determination of titanium content
GB/T 223.17 Chemical analysis method for steel and alloy: the diantipyryl methane photometric method for the determination of titanium content
GB/T 223.18 Chemical analysis method for steel and alloy: sodium thiosulfate separation iodometric method for the determination of copper content
GB/T 223.23 Steel and alloy: the dimethylglyoxime spectrophotometric method for the determination of nickel content
GB/T 223.25 Chemical analysis method for steel and alloy: the dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.26 Chemical analysis method for steel and alloy: the thiocyanate direct photometric method for the determination of molybdenum content
GB/T 223.30 Chemical analysis method for steel and alloy: the arsenazoⅢ spectrophotometric method for the determination of zirconium content after separation by p-bromomandelic acid
GB/T 223.36 Chemical analysis method for steel and alloy: the neutral titration method for the determination of nitrogen content after distillation separation
GB/T 223.37 Chemical analysis method for steel and alloy: the indophenol blue photometric method for the determination of nitrogen content after distillation separation;
GB/T 223.40 Steel and alloy: the chlorisulphophenol S spectrophotometric method for the determination of niobium content
GB/T 223.43 Steel and alloy: the gravimetric method and spectrophotometric method for the determination of tungsten content
GB/T 223.58 Chemical analysis method for steel and alloy: sodium arsenite-sodium nitrite titrimetric method for the determination of manganese content
GB/T 223.59 Iron, steel and alloy: Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method for the determination of phosphorus content
GB/T 223.60 Chemical analysis method for steel and alloy: perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.62 Chemical analysis method for steel and alloy: the butyl acetate extraction photometric method for the determination of phosphorus content
GB/T 223.63 Chemical analysis method for steel and alloy: the sodium (potassium) periodate photometric method for the determination of manganese content
GB/T 223.64 Iron, steel and alloy: the flame atomic absorption spectrometric method for the determination of manganese content
GB/T 223.67 Chemical analysis method for steel and alloy: the reducing distillation-methylene blue photometric method for the determination of sulfur content
GB/T 223.68 Chemical analysis method for steel and alloy: the potassium iodate titration method after combustion in the pipe furnace for the determination of sulfur content
GB/T 223.69 Iron and steel and alloy: the gas-volumetric method after combustion in the pipe furnace for the determination of carbon content
