GB/T 31315-2014 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 31315-2014 | English | 90 |
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Cold drawn or cold rolled precision weld steel tubes for mechanical structures
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GB/T 31315-2014: Cold drawn or cold rolled precision weld steel tubes for mechanical structures---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT31315-2014
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
3 Classification, codes
The cold drawn or cold rolled precision weld steel tubes in this Standard are
classified into five categories according to delivery status. The classifications
and codes are as follows.
4 Order content
The contract or order for the steel pipe ordered according to this Standard shall
include the following information.
5 Size, shape, weight and tolerance
5.1 Outside diameter, inside diameter and wall thickness
5.1.1 Steel pipes are usually delivered in outside diameter and wall thickness.
When the buyer requires delivery in outside diameter and inside diameter OR
inside diameter and wall thickness, it should be indicated in the contract.
5.2 Length
5.2.1 Normal length
The normal length of steel tube is 3000 mm ~ 12000 mm.
5.2.2 Fixed length and double length
According to the requirements of the buyer, after negotiation of the seller and
the buyer and specified in the contract, steel tubes can be delivered in fixed
length or double length.
5.2.3 Other requirements
According to the requirements of the buyer, after negotiation of the seller and
the buyer and specified in the contract, steel tubes of other length and tolerance
can be supplied.
5.3 Degree of curvature
5.3.1 The degree of curvature should not exceed 1.5 mm/m.
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
6.2 Manufacturing method
6.2.1 Steel smelting method
The steel should be the fully killed steel which uses electric furnace or oxygen
converter smelting.
6.2.2 Manufacturing method of steel tube
The steel tube should be made by cold drawing or cold rolling or other suitable
methods via welding tube.
6.3 Delivery state
The steel tube shall be delivered in either of the states listed in Table 3.
Table 3 Delivery status
6.5 Process performance
6.5.1 Flattening test
Steel tubes with a wall thickness to outer diameter ratio of less than 15% in the
+A and +N states shall be subjected to flattening test. The distance H between
plates after specimen flattening is calculated according to equation (1).
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 length at the time of
measurement shall be determined by the seller and the buyer.
6.8 Surface quality
6.8.1 The inner and outer surfaces of the steel tube should be smooth. The
depth of the local pits, scratches and small scratches should not exceed 0.08
mm. The actual wall thickness of these defects shall be not less than the
minimum value allowed for wall thickness deviation.
cold rolled state are allowed to have phosphate and lubricant adhesion layers
from the manufacturing process.
6.8.4 The inner and outer surfaces of steel tubes delivered by heat treatment
state are allowed to have oxide film layer which does not affect surface
examination but not loose oxide skin.
7 Inspection and test methods
7.1 The size and shape of steel tube should be measured one by one by the
mearing tool which meets the accuracy requirements.
7.2 The inner and outer surfaces of steel tube should be visually inspected
one by one under full lighting conditions.
8 Inspection rules
8.1 Inspection and acceptance
The inspection and acceptance of the steel tube shall be carried out by the
quality and technical supervision department of the seller.
8.2 Batching rules
The steel tubes shall be inspected and accepted in batches. Each batch should
consist of steel tubes of same designation, of same furnace number, of same
specification and of same heat treatment system (furnace number) or of same
delivery state. The quantity of each batch of steel tubes shall not exceed the
following provisions.
8.3 Re-inspection and determination rules
The re-inspection and determination rules of steel tubes should comply with the
provisions of GB/T 2102.
9 Packaging, marks and quality certificates
9.1 Before steel tubes leave factory, anti-rust treatment should be carried out
for inner and outer surfaces. Unless otherwise specified in the contract, it should
use neutral oil for anti-rust treatment.
9.2 The marks and quality certificate of steel tube shall meet the requirements
of GB/T 2102.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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