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GB/T 342-2017

Chinese Standard: 'GB/T 342-2017'
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Detail Information of GB/T 342-2017; GB/T342-2017
Description (Translated English): Dimension, shape, mass and tolerance of cold-drawn round, square and hexagonal steel wires
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H49
Classification of International Standard: 77.140.65
Word Count Estimation: 8,84
Date of Issue: 2017-11-01
Date of Implementation: 2018-07-01
Older Standard (superseded by this standard): GB/T 342-1997
Drafting Organization: Hangzhou Chuangyu Metal Products Technology Co., Ltd., Metallurgical Industry Information Standards Institute, Jiangsu Excellent Rolling Machinery Co., Ltd., Fasten Wang Sheng Group Co., Ltd.
Administrative Organization: National Steel Standardization Technical Committee (SAC/TC 183)
Regulation (derived from): National Standard Announcement 2017 No. 29
Proposing organization: China Iron and Steel Association
Issuing agency(ies): People's Republic of China General Administration of Quality Supervision, Inspection and Quarantine, China National Standardization Administration

GB/T 342-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.65
H 49
Replacing GB/T 342-1997
Dimension, shape, mass and tolerance of
cold-drawn round, square and hexagonal steel wires
(ISO 22034-2.2016, Steel wire and wire products –
Part 2. Tolerances on wire dimensions, NEQ)
ISSUED ON. NOVEMBER 1, 2017
IMPLEMENTED ON. JULY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Section diagram and labeling symbol ... 5 
4 Classification, codes ... 7 
5 Dimension, sectional area, and theoretical weight ... 7 
6 Dimension tolerance ... 9 
7 Shape ... 10 
8 Length and tolerance of straight strip steel wire ... 11 
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 342-1997 “Dimension shape mass and tolerance
for cold-drawn round square and hexagonal steel wires”. As compared with
GB/T 342-1997, the main changes of this Standard are as follows.
- MODIFY the scope;
- ADD normative references;
- ADD codes;
- ADD the classification of steel wires;
- DELETE marking example;
- MODIFY the nominal dimension, sectional area, and theoretical weight of
steel wires;
- MODIFY the dimension tolerance of steel wires;
- MODIFY the application range of dimension tolerance level of steel wires;
- MODIFY the shape requirements of steel wires;
- MODIFY the length and tolerance of straight strip steel wires.
This Standard uses the redraft law to refer to ISO 22034-2.2016 “Steel wire and
wire products - Part 2. Tolerances on wire dimensions” for preparation. The
degree of consistency with ISO 22034-2.2016 is not equivalent.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of China National Technical
Committee for Steel Standardization (SAC/TC 183).
Drafting organizations of this Standard. Hangzhou Chuangyu Metal Technology
Co., Ltd., China Metallurgical Information and Standardization Institute, Jiangsu
Goodroller Machinery Co., Ltd., Jiangsu Fasten Group Co., Ltd.
Main drafters of this Standard. Hong Yazhou, Xu Honglin, Ren Cuiying, Wang
Lingjun, Mu Kaihong, Zhou Xiaohong, Zhu Weijun, Wang Huan.
The previous releases of versions of the standard replaced by this Standard
are.
Dimension, shape, mass and tolerance of
cold-drawn round, square and hexagonal steel wires
1 Scope
This Standard specifies the dimension, shape, mass and tolerance of cold-
drawn round, square and hexagonal steel wires.
This Standard is applicable to the cold-drawn round steel wire with a diameter
of 0.05 mm~20 mm, the cold-drawn square steel wire with a side length of 0.50
mm~10 mm, and the cold-drawn hexagonal steel wire with an opposite side
distance of 1.60 mm~10 mm.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the versions with the dates indicated are
applicable to this document. For the undated references, the latest version
(including all the amendments) are applicable to this document.
GB/T 321-2005 Preferred numbers - Series of preferred numbers
GB/T 1800.1-2009 Geometrical product specifications (GPS) - Limits and fits
- Part 1. Bases of tolerances deviations and fits
3 Section diagram and labeling symbol
3.1 The section diagram and labeling symbol of round steel wires are shown in
Figure 1.
Keys.
b - Straightness of steel wire;
Lt - Sampling length of steel wire.
Figure 4 -- Measuring diagram of straightness of straight strip steel wire
Table 4 -- Maximum sampling length for the measurement of
straightness of straight strip steel wire
Nominal diameter D/
mm
Sampling length Lt/
mm
2.00≤D≤6.00 500
6.0013.00Note. Steel wires less than 2.00 mm in diameter are not sufficiently hard to measure the
straightness. If it is measured, it shall be determined by negotiation between the
supply and the demand sides.
Table 5 -- Straightness of straight strip steel wire
Classes Lt=500 mm Lt=1000 mm
Class I b≤0.5 mm b≤2.0 mm
Class II b≤1.0 mm b≤4.0 mm
Class III No requirements
7.4 The steel wire discs shall be regular; and made up of one piece of steel wire......
Related standard:   GB/T 4232-2019  GB/T 4240-2019
   
 
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