1 Scope
This standard specifies the classification and code, ordering content, dimension, shape, weight, tolerance, technical requirements, test methods, inspection rules, packaging, marking and product quality certificates for hydraulic and pneumatic system service.
This standard is applicable to the cold-drawn or cold-rolled precision inside diameter seamless steel tubes for hydraulic and pneumatic system service (hereinafter referred to as steel tubes).
2 Normative reference
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) 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 223.12 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/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 223.59 Iron, steel and alloy — Determination of phosphorus content — Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method
GB/T 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 228.1 Metallic materials — Tensile testing — Part 1: Method of test at room temperature
GB/T 229 Metallic materials — Charpy pendulum impact test method
GB/T 242 Metallic materials — Tube — Drift expanding test
GB/T 246 Metallic materials — Tube — Flattening test
GB/T 699-2015 Quality carbon structure steels
GB/T 1031 Geometrical product specifications (GPS) — Surface texture: Profile method — Surface roughness parameters and their values
GB/T 1591-2008 High strength low alloy structural steels
GB/T 2102 Acceptance, packing, marking and quality certification of steel pipe
GB/T 2975 Steel and steel products — Location and preparation of samples and test pieces for mechanical testing
GB/T 3077-2015 Alloy structure steels
GB/T 4336 Carbon and low-alloy steel — Spark discharge atomic emission spectrometric method (routine method)
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 7735-2004 Steel tubes — The inspection method on eddy current test
GB/T 12606-2016 Automated full peripheral flux leakage testing of seamless and welded (except submerged arc-welded) ferromagnetic steel tubes for the detection of longitudinal and/or transverse imperfections
GB/T 17395 Dimensions, shapes, masses and tolerances of seamless steel tubes
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 20125 Low-alloy steel — Determination of multi-element contents — Inductively coupled plasma atomic emission spectrometric method
3 Classification and code
Steel tubes are classified and coded according to delivery state as follows:
a) Cold-drawn or cold-rolled/hard: +C;
b) Cold-drawn or cold-rolled/soft: +LC;
c) Stress-relief annealing after cold-drawn or cold-rolled: +SR;
d) Annealing: +A;
e) Normalizing: +N.
Foreword I
1 Scope
2 Normative reference
3 Classification and code
4 Order contents
5 Dimension, shape, weight and tolerance
6 Technical requirements
7 Test method
8 Inspection rules
9 Packaging, marking and quality certificate
