Standard No.:	GB/T 12770-2012
English Name:	Welded stainless steel tubes for mechanical structures
Chinese Name:	机械结构用不锈钢焊接钢管
Chinese Classification:	H48    Steel tube and cast iron pipe
Professional Classification:	GB    National Standard
ICS Classification:	77.140.75 77.140.75    Steel pipes and tubes for specific use 77.140.75
Issued by:	AQSIQ,SAC
Issued on:	2012-11-5
Implemented on:	2013-5-1
Status:	valid
Superseding:	GB/T 12770-2002 Welded Stainless Steel Tubes for Machine Structures
Language:	English
File Format:	PDF
Word Count:	7000 words
Price(USD):	210.0
Delivery:	via email in 1 business day

Welded stainless steel tubes for mechanical structures 1 Scope This standard specifies classification and code, order information, dimensions, shape, weight and permissible deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of welded stainless steel tubes for mechanical structures. This standard is applicable to welded stainless steel tubes (hereinafter referred to as steel tubes) for machinery, automobiles, bicycles, furniture and other mechanical components and structural members. 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 reference, the latest edition of the referenced documents (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 aluminium 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 223.16 Methods for chemical analysis of iron, steel and alloy—The chromotropic acid photometric method for the determination of titanium content 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 223.25 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 indophenol 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 S 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

Foreword i 1 Scope 2 Normative references 3 Classification and code 4 Order information 5 Dimension, shape, weight and permissible deviation 6 Technical requirements 7 Test methods 8 Inspection rules 9 Packaging, marking and quality certificate Annex A (Informative) Comparison of stainless steel designations in different standards

*GB/T 222-2006 Permissible Tolerances for Chemical Composition of Steel Products
*GB/T 223.9-2008 Iron steel and alloy - Determination of aluminium content - Chrom azurol S photometric method
*GB/T 223.11-2008 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method
*GB/T 223.16-1991 Methods for Chemical Analysis of Iron, Steel and Alloy - The Chromotropic Acid Photometric Method for the Determination of Titaninm Content
*GB/T 223.18-1994 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Thiosulfate Separation Iodimetric Method for the Determination of Copper Content
*GBT223.19-
*GB/T 223.25-1994 Methods for chemical analysis of iron, steel and alloy.The dimethylglyoxime gravimetric method for the determination of nickel content
*GB/T 223.26-2008 Iron, Steel and Alloy - Determination of Molybdenum Content - The Thiocyanate Spectrophotometric Method
*GBT223.28-
*GB/T 223.36-1994 Methods for chemical analysis of iron, steel and alloy The neutral titration method for the determinaion of nitrogen content after distillation separation
*GB/T 223.37-2020 Iron, steel and alloy—Determination of nitrogen content—Indophenol blue spectrophotometric method after distillation separation
*GB/T 223.40-2007 Iron, Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method
*GB/T 223.60-1997 Methods for chemical analysis of iron,steel and alloy The perchloric acid dehydration gravimetric method for the determination of silicon content
*GB/T 223.62-1988 Methods for chemical analysis of iron, steel and alloy; The butyl acetate extraction photometric method for the determination of phosphorus content
*GBT223.63-
*GB/T 223.68-1997 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 223.69-2008 Iron, Steel and Alloy-Determination of Carbon Contents- Gas-volumetric Method after Combustion in the Pipe Furnace
*GB/T 223.72-2008 Iron, Steel and Alloy - Determination of Sulfur Content - Gravimetric Method
*GB/T 223.84-2009 Steel and iron—Determination of titanium content—Diantipyrylmethane spectrophotometric method
*GB/T 223.85-2009 Steel and iron—Determination of sulfur content—Infrared absorption method after combustion in an induction furnace
*GB/T 223.86-2009 Steel and iron—Determination of total carbon content—Infrared absorption method after combustion in an induction furnace
*GB/T 228.1-2010 Metallic materials - Tensile testing - Part 1 : Method of test at room temperature
*GB/T 232-2010 Metallic materials—Bend test
*GB/T 242-2007 Metal materials – Tube – Drift-expending test
*GB/T 245-2016 Metallic materials-Tube-Flanging test
*GB/T 246-2017 Metallic materials. Tube. Flattening test
*GB/T 2102-2006 Acceptance packing marking and quality certification of steel pipe
*GB/T 2975-2018 Steel and steel products—Location and preparation of samples and test pieces for mechanical testing
*GB/T 3323-2005 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 7735-2016 Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections
*GB/T 11170-2008 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (Routine method)
*GB/T 20066-2006 Steel and Iron-Sampling and Preparation of Samples for the Determination of Chemical Composition
*GB/T 20123-2006 Steel and iron—Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method)
*GB/T 20124-2006 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas
*GB/T 20878-2007 Stainless and heat-resisting steels—Designation and chemical composition
*GB/T 21835-2008 Dimensions and Masses per Unit Length of Welded Steel Pipes