GB/T 40316-2021 Welded high strength shaped and round steel tubes for automobile structure
1 Scope
This document specifies the classification and codes, order information, dimensions, shape, weight and permissible deviations, technical requirements, test methods, inspection rules, and packaging, marking and quality certification of welded high strength shaped and round steel tubes for automobile structures.
This document is applicable to the welded high strength shaped and round steel tubes for automobile structures (hereinafter referred to as "steel tubes").
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 aluminium content - Chrome azurol S photometric method
GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane photometric method for the determination of titanium content
GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The thiocyanate spectrophotometric method
GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S 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 223.76 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrometric method for the determination of vanadium content
GB/T 223.78 Methods for chemical analysis of iron, steel and alloy - Curcumin spectrophotometric method for the determination of boron content
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 229 Metallic materials - Charpy pendulum impact test method
GB/T 242 Metal materials - Tube - Drift-expanding test
GB/T 244 Metallic materials - Tube - Bend test method
GB/T 246 Metallic materials - Tube - Flattening test
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 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 5777-2019 Automated full peripheral ultrasonic testing of seamless and welded (except submerged arc-welded) steel tubes for the detection of longitudinal and/or transverse imperfections
GB/T 6726 Cold forming sectional steel for vehicles - Dimensions, shape, weight and tolerances
GB/T 7735-2016 Automated eddy current testing of seamless and welded (except submerged arc-welded) steel tubes for detection of imperfections
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams
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 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
GB/T 21835 Dimensions and masses per unit length of welded steel pipes
GB/T 30062 Terminology of steel pipes and tubes
3 Terms and definitions
For the purpose of this document, the terms and definitions given in GB/T 30062 apply.
4 Classification and codes
4.1 Naming method for steel grades
Steel grades are named according to the specified minimum upper yield strength values and are classified into 355, 380, 420, 460, 500, 550, 600, 650, and 700.
4.2 Classification and codes for precision levels of steel tubes
4.2.1 The classification and codes for the precision levels of steel tubes based on the outside diameter (side length) are as follows:
a) Ordinary level: PD(P A/B).a;
b) Relatively high level: PD(P A/B).b;
c) High level: PD(P A/B).c.
Contents
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and codes
5 Order information
6 Dimensions, shape, weight and permissible deviations
7 Technical requirements
8 Test methods
9 Inspection rules
10 Packaging, marking and quality certification
Annex A (Informative) Cross-sectional diagrams of shaped steel tubes
Annex B (Normative) Determination method for the torsion value of shaped steel tubes
Annex C (Normative) Flattening test method for shaped steel tubes
