1 Scope
This standard specifies the classification, code number, size, appearance, weight, allowable deviation, technical requirements, test methods, inspection rules, packing, marking and quality certificate of the seamless cold-drawn or cold-rolled steel tubes for precision applications.
This standard is applicable to the machine building structure, hydraulic equipment, automobile parts and other seamless cold-drawn or cold-rolled steel tubes for precision applications with special measurements size precision and high surface quality requirements.
2 Normative References
The following normative documents contain provision which, through reference in this text, constitute provisions of this national standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. But the parties to agreements based on this standard are encouraged to investigate the possibility of applying the latest editions of the standards indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method (GB/T 223.5-2008, ISO 4829-1:1986 ISO 4829-2:1988,MOD )
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 223.23 Iron steel and alloy - Determination of nickel content - The dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB 223.53 Methods for chemical analysis of iron,steel and alloy -- The flame atomic absorption spectrophotometric method for the determination of copper 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 223.63 Methods for chemical analysis of iron, steel and alloy -- The sodium (potassium) periodate photometric method for the determination of manganese content
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 228 Metallic materials--Tensile testing at ambient temperature (GB/T 228-2002, eqv ISO 6892:1998)
GB/T 242 Metal materials-Tube-Drift-expending test (GB/T 242-2007, ISO 8493:1998 IDT)
GB/T 246 Metal materials-Tube-Flattening test (GB/T 246-2007, ISO 8492:1998, IDT)
GB/T 699 Quality carbon structural steels
GB/T 1031 Surface roughness parameters and their values
GB/T 1591 High strength low alloy structural steels
GB/T 2102 Acceptance packing marking and quality certification of steel tube
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-Alloy steel (routine method)
GB/T 7735 Steel tubes-The inspection method on eddy current test
GB/T 12606 Steel tubes-The testing method of magnetic flux leakage
GB/T 17395 Dimensions shapes masses and tolerances of seamless steel tubes (GB/T 17395-2008, ISO 4200:1991, ISO 5252:1991, ISO 1127:1992, NEQ)
GB/T 20066 Steel and Iron-Sampling and preparation of samples for the determination of chemical composition (GB/T 20066-2006, ISO 14284:1996, IDT)
