Skip to product information
1 of 9

PayPal, credit cards. Download editable-PDF and invoice in 1 second!

GB/T 31315-2014 English PDF (GBT31315-2014)

GB/T 31315-2014 English PDF (GBT31315-2014)

Regular price $85.00 USD
Regular price Sale price $85.00 USD
Sale Sold out
Shipping calculated at checkout.
Quotation: In 1-minute, 24-hr self-service. Click here GB/T 31315-2014 to get it for Purchase Approval, Bank TT...

GB/T 31315-2014: Cold drawn or cold rolled precision weld steel tubes for mechanical structures

This Standard specifies the classification, code, dimension, shape, weight and tolerance, technical requirements, inspection and test methods, inspection rules, packaging, marks and quality certificates of cold drawn or cold rolled precision weld steel tubes for automotive and machinery.
GB/T 31315-2014
GB
NATIONAL STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 77.140.75
H 48
Cold drawn or cold rolled precision
weld steel tubes for mechanical structures
ISSUED ON. DECEMBER 5, 2014
IMPLEMENTED ON. SEPTEMBER 1, 2015
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Classification, codes ... 7
4 Order content ... 7
5 Size, shape, weight and tolerance ... 7
6 Technical requirements ... 11
7 Inspection and test methods ... 15
8 Inspection rules ... 16
9 Packaging, marks and quality certificates ... 17
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee on Steel of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Standard. Jiangsu Zhongyou Precision Tube Co., Ltd., Jiangsu Feng Li Precision Tube Co., Ltd.
Main drafters of this Standard. Yao Zhiqiang, Wu Huiti, Ni Zhihong, Jiang Xiaojun, Yu Qingwen.
Cold drawn or cold rolled precision
weld steel tubes for mechanical structures
1 Scope
This Standard specifies the classification, code, dimension, shape, weight and tolerance, technical requirements, inspection and test methods, inspection rules, packaging, marks and quality certificates of cold drawn or cold rolled precision weld steel tubes for automotive and machinery.
This Standard is applicable to the cold drawn or cold rolled precision weld steel tubes with special dimensional accuracy and high surface quality requirements for machinery manufacturing, vehicle manufacturing, furniture 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, Method of sampling steel for determination of chemical
composition and permissible variations for product analysis
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 - 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 223.12, 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 Titaninm
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 Method 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 extraction-absorption catalytic polarographic 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-expending test
GB/T 246, Metal 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 packing marking and quality certification of steel pipe
GB/T 2975, Steel and Steel Products - Location and Preparation of 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 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)
5.3.1 The degree of curvature should not exceed 1.5 mm/m.
5.3.2 For steel tube of which the outer diameter is greater than 16 mm, the degree of curvature of its full length should not be greater than 0.1% of the length of steel tube.
5.2.3 According to the requirements of the buyer, after negotiation of the seller and the buyer and specified in the contract, other provisions may be used for the degree of curvature per meter and of the full length of steel tubes. 5.4 Head shape
Both ends of the steel tube should be perpendicular to the tube axis. The incision burr should be removed.
5.5 Non-roundness and uneven wall thickness
The non-roundness and uneven wall thickness of steel tube should not be greater than 80% of the outside diameter tolerance and wall thickness tolerance respectively.
5.6 Delivery weight
Steel tubes can be delivered in actual weight or theoretical weight. The theoretical weight per meter of steel tube shall be in accordance with GB/T 17395 (the density of the steel is 7.85 kg/dm3).
6 Technical requirements
6.1 Steel designation and chemical composition
6.1.1 The designation and chemical composition of the steel (melting analysis) shall be in accordance with the relevant provisions of Q195, Q215, Q235, and Q275 of GB/T 700 and Q345 of GB/T 1591. According to buyer?€?s requirements, after negotiation of the seller and the buyer, steel tubes of other designations can be supplied.
6.1.2 When the analysis on finished product required by the buyer, it should be indicated in the contract that the tolerance of the chemical composition of finished steel tube shall comply with the provisions of GB/T 222.
6.2 Manufacturing method
6.2.1 Steel smelting method
The steel should be the fully killed steel which uses electric furnace or oxygen converter smelting.
of acceptance Grade B of GB/T 7735-2004.
6.7 Surface roughness
When the buyer has requirements for surface roughness of steel tube, it should be indicated in the contract. The parameters of surface roughness shall be determined by the contour arithmetic mean deviation Ra specified in GB/T 1031. Its surface roughness value and the sampling...

View full details