GB/T 12771-2019 Welded stainless steel pipes for fluid transport English
1 Scope
This standard specifies the classification and code, order contents, dimensions, shapes and weights, technical requirements, test methods, inspection rules, and packaging, marking and quality certification of welded stainless steel pipes for fluid transport.
This standard is applicable to welded stainless steel pipes for fluid transport (hereinafter referred to as steel pipes).
2 Normative references
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 223.9 Iron, steel and alloy - Determination of aluminum content - Chrom azurol S photometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodimetric method for the determination of copper 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 223.25 Methods for chemical analysis of iron, steel and alloy - The dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB/T 223.28 Methods for chemical analysis of iron, steel and alloy - The α-benzoinoxime gravimetric method for the determination of molybdenum content
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 indophenal blue photometric methods for the determination of nitrogen content after distillation separation
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol spectrophotometric method
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 223.63 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 223.84 Steel and alloy - Determination of titanium content - Diantipyrylmethane spectrophotometric 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 and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 241 Metal materials - Tube - Hydrostatic pressure test
GB/T 245 Metallic materials - Tube - Flanging test
GB/T 246 Metallic materials - Tube - Flattening test
GB/T 2102 Acceptance, packing, marking and quality certification of steel pipe
GB/T 2650 Impact test methods on welded joints
GB/T 2651 Tensile test method on welded joints
GB/T 2653 Bend test methods on welded joints
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 3323 Radiographic examination of fusion welded joints in metallic materials
GB/T 4334-2008 Corrosion of metals and alloys - Test methods for intergranular corrosion of stainless steels
GB/T 6394 Determination of estimating the average grain size of metal
GB/T 7735-2016 Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections
GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (Routine method)
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)
GB/T 21835 Dimensions and masses per unit length of welded steel pipes
NB/T 47013.2 Nondestructive testing of pressure equipment - Part 2: Radiographic testing
NB/T 47013.11 Non-destructive testing of pressure equipment - Part 11: Testing by X-ray digital radiography
3 Classification and code
3.1 Steel pipes are classified and coded according to manufacturing methods and radiographic testing as follows:
a) I——the steel pipe is manufactured by double-side automatic welding method, with 100% welds subjected to radiographic inspection in full-length;
b) II——the steel pipe is manufactured by single-sideautomatic welding method, with 100% welds subjected to radiographic inspection in full-length;
c) III——the steel pipe is manufactured by double-side automatic welding method, with partial welds subjected to radiographic inspection;
d) IV——the steel pipe is manufactured by single-side automatic welding method, with partial welds subjected to radiographic inspection;
e) V——the steel pipe is manufactured by double-side automatic welding method, with welds not subjected to radiographic inspection;
f) Ⅵ——the steel pipe is manufactured by single-side automatic welding method, with welds not subjected to radiographic inspection.
3.2 Steel pipes are classified and coded according to delivery state as follows:
a) in as-welded state +H;
b) in heat treatment state +T;
c) in polished state +SP.
4 Order contents
GB/T 12771-2019 The following standards are cited：
