1 Scope
This standard specifies order information, dimension, shape, weight and permissible deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of quality hot rolled and forged carbon structural steel round tube blank.
This standard is applicable to hot rolled round tube blanks with diameters of 50 mm ~ 400 mm and forged round tube blanks with diameters of 60 mm ~ 900 mm (hereinafter referred to as tube blank) for manufacturing seamless steel pipes.
2 Normative references
The following documents are indispensable for the application of this specification. For dated references, only the edition cited applies. For undated reference, the latest edition (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy — The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content
GB/T 223.5 Steel and iron — Determination of acid-soluble silicon and total silicon content — Reduced molybdosilicate spectrophotometric method
GB/T 223.9 Iron,steel and alloy — Determination of aluminum content — Chrome azurol S photometric method
GB/T 223.11 Iron steel and alloy — Determination of chromium content — Visual titration or potentiometric titration method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy — The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy — The sodium thiosulfate separation iodimetric method for the determination of cupper content
GB/T 223.19 Methods for chemical analysis of iron,steel and alloy — The neocuproine-chloroform extraction photometric method for the determination of copper content
GB/T 223.23 Iron,steel and alloy — Determination of nickel content — The dimethylglyoxime spectrophotometric method
GB/T 223.36 Methods for chemical analysis of iron, steel and alloy — The neutral titration method for the determination of nitrogen content after distillation separation
GB/T 223.37 Methods for chemical analysis of iron, steel and alloy — The indophenol blue photometric methods for the determination of nitrogen content after distillation separation
GB/T 223.53 Methods for chemical analysis of iron, steel and alloy — Flame atomic absorption spectrometric method for the determination of copper content
GB/T 223.54 Methods for chemical analysis of iron, steel and alloy — Flame atomic absorption spectrometric method for the determination of copper content
GB/T 223.58 Methods for chemical analysis of iron,steel and alloy; The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese content
GB/T 223.59 Iron, steel and alloy — Determination of phosphorus content — Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 223.60 Methods for chemical analysis of iron,steel and alloy — The perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 223.61 Methods for chemical analysis of iron, steel and alloy — The ammonium phosphomolybdate volumetric method for the determination of phosphorus content
GB/T 223.62 Methods for chemical analysis of iron, steel and alloy — The butyl acetate extraction photometric method for the determination of phosphorus content
GB/T 223.64 Iron steel and alloyed — Determination of manganese content — Flame atomic absorption spectrometric method
GB/T 223.67 Iron steel and alloy — Determination of sulfur content — Methylene blue spectrophotometric method
GB/T 223.68 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 223.69 Iron, steel and alloy — Determination of carbon contents — Gas-volumetric method after combustion in the pipe furnace
GB/T 223.71 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 223.72 Iron, steel and alloy — Determination of sulfur content — Gravimetric method
GB/T 223.85 Steel and iron — Determination of sulfur content — Infrared absorption method after combustion in an induction furnace
GB/T 223.86 Steel, iron and alloy — Determination of total carbon content — Infrared absorption method after combustion in an induction furnace
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 699 Quality carbon structure steels
GB/T 1979-2001 Standard diagrams for macrostructure and defect of structural steels
GB/T 2101 General requirement of acceptance, packaging, marking and certification for section steel
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low — Alloy steel (Routine method)
GB/T 6394 Metal-methods for estimating the average grain size
GB/T 10561 Steel — Determination of content of nonmetallic inclusions — Micrographic method using standards diagrams
GB/T 20066 Steel and iron — Sampling and preparation of samples for the determination of chemical composition
GB/T 20123 Steel and iron — Determination of total carbon and sulfur content — Infrared absorption method after combustion in an induction furnace (routine method)
GB/T 20124 Steel and iron — Determination of nitrogen content — Thermal conductimetric method after fusion in a current of inert gas (routine method)
YB/T 081 Rule for rounding off of numberical values and judgment of testing values for technical standards of metallurgy
3 Order contents
Contracts or orders made based on this standard shall cover the following items:
a) Standard No.;
b) product name;
c) designation;
d) specification;
e) length;
f) weight (or quantity);
g) delivery state;
h) other special requirements.
Foreword i
1 Scope
2 Normative references
3 Order contents
4 Dimension, shape, weight and allowable deviation
5 Technical requirement
6 Test method
7 Inspection rules
8 Packaging, marking and quality certificate
9 Rounding off of numerical values
