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GB/T 31315-2014 (GBT31315-2014)

GB/T 31315-2014_English: PDF (GBT 31315-2014, GBT31315-2014)
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GB/T 31315-2014English90 Add to Cart 0--9 seconds. Auto-delivery Cold drawn or cold rolled precision weld steel tubes for mechanical structures Valid GB/T 31315-2014

BASIC DATA
Standard ID GB/T 31315-2014 (GB/T31315-2014)
Description (Translated English) Cold drawn or cold rolled precision weld steel tubes for mechanical structures
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H48
Classification of International Standard 77.140.75
Word Count Estimation 11,120
Date of Issue 2014/12/5
Date of Implementation 2015/9/1
Quoted Standard GB/T 222; GB/T 223.5; GB/T 223.9; GB/T 223.11; GB/T 223.12; GB/T 223.14; GB/T 223.16; GB/T 223.18; GB/T 223.19; GB/T 223.23; GB/T 223.26; GB/T 223.32; GB/T 223.37; GB/T 223.40; GB/T 223.53; GB/T 223.59; GB/T 223.58; GB/T 223.60; GB/T 223.63; GB/T 223.64;
Drafting Organization Jiangshu Friends of Precision Pipe Co., Ltd.
Administrative Organization National Steel Standardization Technical Committee
Regulation (derived from) Announcement of Newly Approved National Standards 2014 No. 27
Proposing organization China Iron and Steel Association
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This Standard specifies the automotive and machinery classification drawn or cold rolled welded steel pipe, code, size, shape, weight and tolerances, technical requirements, testing and test methods, inspection rules, packaging, marking and quality certif

Standards related to: GB/T 31315-2014

GB/T 31315-2014
GB
NATIONAL STANDARD OF
THE PEOPLE’S 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...
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