GB/T 31315-2014 Cold drawn or cold rolled precision weld steel tubes for mechanical structures
1 Scope
This standard specifies the classification, grade, dimensions, shape, weight and tolerance, technical requirements, inspection and test methods, inspection rules, packaging, marking and quality certificates for cold drawn or cold rolled precision weld steel tubes for mechanical structures for automobiles and machinery.
This standard is applicable to cold drawn or cold rolled precision weld steel tubes with special dimensional precision and high surface quality requirements for use in mechanical manufacturing, vehicle manufacturing, furniture products and general engineering industries.
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 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
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 223.12 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 223.14 Methods for chemical analysis of iron, steel and alloy - The N-benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content
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 223.23 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 223.32 Methods for chemical analysis of iron, steel and alloy - The hypophosphite reduction - Iodimetric method for the determination of arsenic content
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 223.53 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content
GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese 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 223.60 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 223.64 Iron, steel and alloy - Determination of manganese content - Flame atomic absorption spectrometric method
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 223.71 Methods for chemical analysis of iron, steel and alloy - The gravimetric method after combustion in the pipe furnace for the determination of carbon content
GB/T 223.72 Iron, steel and alloy - Determination of sulfur content - Gravimetric method
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 242 Metal materials - Tube - Drift-expanding test
GB/T 246 Metallic materials - Tube - Flattening test
GB/T 700 Carbon structural steels
GB/T 1031 Geometrical product specifications (GPS) - Surface texture: Profile method - Surface roughness parameters and their values
GB/T 1591 High strength low alloy structural steels
GB/T 2102 Acceptance, packaging, marking and quality certification for steel tubular products
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 7735-2004 Steel tubes - The inspection method on eddy current test
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
In this standard, cold drawn or cold rolled weld steel tubes are classified into five categories based on delivery states, with their grades as follows:
a) Cold drawn or cold rolled/hard state: +C;
b) Cold drawn or cold rolled/soft state: +LC;
c) Stress-relief annealed state: +SR;
d) Annealed state: +A;
e) Normalized state: +N.
4 Order contents
The contract or order for steel tubes according to this standard shall include the following contents:
a) No. of this standard;
b) Product name;
c) Steel grade (quality level);
d) Dimension & specification;
e) Order quantity (total weight or total length);
f) Delivery state (including surface condition);
g) Manufacturing method;
h) Special requirements.
Contents
Foreword i
1 Scope
2 Normative references
3 Classification and code
4 Order contents
5 Dimension, shape, weight and tolerance
6 Technical requirements
7 Inspection and test methods
8 Inspection rules
9 Packaging, marking and quality certificate
GB/T 31315-2014 Cold drawn or cold rolled precision weld steel tubes for mechanical structures
1 Scope
This standard specifies the classification, grade, dimensions, shape, weight and tolerance, technical requirements, inspection and test methods, inspection rules, packaging, marking and quality certificates for cold drawn or cold rolled precision weld steel tubes for mechanical structures for automobiles and machinery.
This standard is applicable to cold drawn or cold rolled precision weld steel tubes with special dimensional precision and high surface quality requirements for use in mechanical manufacturing, vehicle manufacturing, furniture products and general engineering industries.
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 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
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 223.12 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 223.14 Methods for chemical analysis of iron, steel and alloy - The N-benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content
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 223.23 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 223.32 Methods for chemical analysis of iron, steel and alloy - The hypophosphite reduction - Iodimetric method for the determination of arsenic content
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 223.53 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of copper content
GB/T 223.58 Methods for chemical analysis of iron, steel and alloy - The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese 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 223.60 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 223.64 Iron, steel and alloy - Determination of manganese content - Flame atomic absorption spectrometric method
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 223.71 Methods for chemical analysis of iron, steel and alloy - The gravimetric method after combustion in the pipe furnace for the determination of carbon content
GB/T 223.72 Iron, steel and alloy - Determination of sulfur content - Gravimetric method
GB/T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 242 Metal materials - Tube - Drift-expanding test
GB/T 246 Metallic materials - Tube - Flattening test
GB/T 700 Carbon structural steels
GB/T 1031 Geometrical product specifications (GPS) - Surface texture: Profile method - Surface roughness parameters and their values
GB/T 1591 High strength low alloy structural steels
GB/T 2102 Acceptance, packaging, marking and quality certification for steel tubular products
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 7735-2004 Steel tubes - The inspection method on eddy current test
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
In this standard, cold drawn or cold rolled weld steel tubes are classified into five categories based on delivery states, with their grades as follows:
a) Cold drawn or cold rolled/hard state: +C;
b) Cold drawn or cold rolled/soft state: +LC;
c) Stress-relief annealed state: +SR;
d) Annealed state: +A;
e) Normalized state: +N.
4 Order contents
The contract or order for steel tubes according to this standard shall include the following contents:
a) No. of this standard;
b) Product name;
c) Steel grade (quality level);
d) Dimension & specification;
e) Order quantity (total weight or total length);
f) Delivery state (including surface condition);
g) Manufacturing method;
h) Special requirements.
Contents of GB/T 31315-2014
Contents
Foreword i
1 Scope
2 Normative references
3 Classification and code
4 Order contents
5 Dimension, shape, weight and tolerance
6 Technical requirements
7 Inspection and test methods
8 Inspection rules
9 Packaging, marking and quality certificate
