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GB/T 702-2017

Chinese Standard: 'GB/T 702-2017'
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Detail Information of GB/T 702-2017; GB/T702-2017
Description (Translated English): Hot-rolled steel bars - Dimensions, shape, weight and tolerances
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H44
Classification of International Standard: 77.140.60
Word Count Estimation: 18,173
Date of Issue: 2017-09-29
Date of Implementation: 2018-06-01
Drafting Organization: Northeast Special Steel Group North Man Special Steel Co., Ltd., Metallurgical Industry Information Standards Institute, Jiangyin Xingcheng Special Steel Co., Ltd., Shougang Corporation, Fushun Special Steel Co., Ltd.
Administrative Organization: National Steel Standardization Technical Committee (SAC/TC 183)
Proposing organization: China Iron and Steel Association
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of PRC; China National Standardization Administration

GB/T 702-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.60
H 44
Replacing GB/T 702-2008
Hot-rolled steel bars - Dimensions,
shape, weight and tolerances
热轧钢棒尺寸, 外形, 重量及允许偏差
ISSUED ON. SEPTEMBER 29, 2017
IMPLEMENTED ON. JUNE 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Cross-sectional shape ... 5
3 Cross-sectional dimensions, weight and tolerances ... 6
4 Length and tolerances ... 9
5 Shape ... 11
Annex A (normative) Dimensions and theoretical weight of hot-rolled steel bars
... 15
Foreword
This Standard is drafted in accordance with the rules given GB/T 1.1-2009.
This Standard replaces GB/T 702-2008 “Hot-rolled steel bars - Dimensions, shape,
weight and tolerances”, and compared with GB/T 702-2008, the main changes are as
follows.
- ADJUST the range of hot-rolled round steel bars and square steels;
- ADJUST the tolerances on dimensions of hot-rolled round steels and square steels;
- DELETE the provision on the full length of hot-rolled steel bars of general quality;
- ADJUST the provision on the misshaped cutting at both ends of hot-rolled round
steels and square steels;
- ADD the provision on the fillet radius of hot-rolled flat steels;
- ADJUST the provision on the curvature of hot-rolled hexagonal steels and hot-
rolled octagonal steels;
- ADJUST the provision on the misshaped cutting of hot-rolled hexagonal steels and
hot-rolled octagonal steels;
- DELETE the example of marking.
This Standard is proposed by China Iron and Steel Association.
This Standard is under the jurisdiction of National Technical Committee on Steel of
Standardization Administration of China (SAC/TC 183).
Drafting organizations of this Standard. Beiman Special Steel Co., Ltd. of Dongbei
Special Steel Group, China Metallurgical Information and Standardization Institute,
Jiangyin Xingcheng Special Steel Co., Ltd., Shougang Group, Fushun Special Steel
Shares Co., Ltd.
Main drafters of this Standard. Qian Chengyun, Wang Yujie, Chen Qinghua, Xiong
Huabing, Gu Qiang, Liu Baoshi, Zhang Jinfeng.
The historical editions of the standard replaced by this Standard are as follows.
- GB/T 702-1965, GB/T 702-1972, GB/T 702-1986, GB/T 702-2004, GB/T 702-2008;
- GB/T 704-1983, GB/T 704-1989;
- GB/T 705-1983, GB/T 705-1990;
- GB/T 911-1966, GB/T 911-2004.
Hot-rolled steel bars - Dimensions,
shape, weight and tolerances
1 Scope
This Standard specifies the cross-sectional shape, cross-sectional dimensions, weight
and tolerances, length and tolerances, appearance, etc. of hot-rolled steel bars (round
steels, square steels, flat steels, hexagonal steels, octagonal steels).
This Standard applies to hot-rolled round steels with the diameter of 5.5 mm ~ 380 mm
and hot-rolled square steels with the side length of 5.5 mm ~ 300 mm; hot-rolled flat
steels for general purposes with the thickness of 3 mm ~ 60 mm and the width of 10
mm ~ 200 mm; hot-rolled tool flat steels with the thickness of 4 mm ~ 100 mm and the
width of 10 mm ~ 310 mm (hot-rolled flat steels and hot-rolled tool flat steels for general
purposes are generally referred to as hot-rolled flat steels); hot-rolled hexagonal steels
with the distance across flats of 8 mm ~ 70 mm and hot-rolled octagonal steels with
the distance across flats of 16 mm ~ 40 mm.
2 Cross-sectional shape
2.1 The cross-sectional shape of hot-rolled round steels and square steels is shown in
Figure 1.
Figure 1 -- Schematic diagram of cross-section of hot-rolled round steels and
square steels
2.2 The cross-sectional shape of hot-rolled flat steels is shown in Figure 2.
Diameter (d) Side length (a)
Side length (a)
Figure 2 -- Schematic diagram of cross-section of hot-rolled flat steels
2.3 The cross-sectional shape of hot-rolled hexagonal steels and hot-rolled octagonal
steels is shown in Figure 3.
Figure 3 -- Schematic diagram of cross-section of hot-rolled hexagonal steels
and hot-rolled octagonal steels
3 Cross-sectional dimensions, weight and tolerances
3.1 Dimensions and weight
3.1.1 The dimensions and theoretical weight of hot-rolled round steels and square
steels shall comply with the provisions of Table A.1 in Annex A.
3.1.2 The dimensions and theoretical weight of hot-rolled flat steels for general
purposes shall comply with the provisions of Table A.2.
3.1.3 The dimensions and theoretical weight of hot-rolled tool flat steels shall comply
with the provisions of Table A.3.
3.1.4 The dimensions and theoretical weight of hot-rolled hexagonal steels and hot-
rolled octagonal steels shall comply with the provisions of Table A.4.
3.1.5 Negotiated by both supply and demand parties and indicated in the contract,
steel bars with other dimensions not specified in the table of Annex A may also be
supplied.
Width (b)
Thickness (t)
Distance across flats (s)
Fillet radius
Distance across flats (s)
Fillet radius
3.1.6 Hot-rolled steel bars are generally delivered in actual weight. Negotiated by both
supply and demand parties and indicated in the contract, hot-rolled steel bars may also
be delivered in theoretical weight.
3.2 Dimensions and tolerances
3.2.1 The tolerances on dimensions of hot-rolled round steels and square steels shall
comply with the provisions of Table 1. The group of tolerances on dimensions shall be
indicated in the corresponding product standards or order contract; if not indicated, the
tolerances of Group 3 shall prevail.
Table 1 -- Tolerances on dimensions of hot-rolled round steels and square
steels
In millimeters
Key.
A - Nominal dimensions of cross-section (diameter of round steels or side length of square
steels).
3.2.2 The tolerances on dimensions of hot-rolled flat steels for general purposes shall
comply with the provisions of Table 2. The group of tolerances on dimensions shall be
indicated in the corresponding product standards or order contract; if not indicated, the
tolerances of Group 2 shall prevail.
A Tolerances on dimensions
Group 1 Group 2 Group 3
Table 2 -- Tolerances on dimensions of hot-rolled flat steels for general
purposes
In millimeters
3.2.3 The tolerances on dimensions of hot-rolled tool flat steels shall comply with the
provisions of Table 3.
Table 3 -- Tolerances on dimensions of hot-rolled tool flat steels
In millimeters
3.2.4 The tolerances on dimensions of hot-rolled hexagonal steels and hot-rolled
octagonal steels shall comply with the provisions of Table 4. The group of tolerances
on dimensions shall be indicated in the corresponding product standards or order
contract; if not indicated, the tolerances of Group 3 shall prevail. Negotiated by both
supply and demand parties and indicated in the contract, they can be rolled with
positive deviation, and the tolerances on dimensions of hot-rolled hexagonal steels
and hot-rolled octagonal steels shall be the tolerances of the hexagonal steels and
Group 1 Group 2 Group 1 Group 2
Tolerances Tolerances
Width (b) Thickness (t)
Nominal
dimensions
Nominal
dimensions
Tolerance Nominal width
Width and tolerance
Tolerance Nominal width
Width and tolerance
Negotiated by both supply and demand parties
The thickness difference measured at any two points on the same section shall not be greater than
50 % of the thickness tolerance.
octagonal steels listed in Table 4.
Table 4 -- Tolerances on dimensions of hot-rolled hexagonal steels and hot-
rolled octagonal steels
In millimeters
3.2.5 Negotiated by both supply and demand parties, and indicated in the contract, the
tolerances on dimensions of steel bars may be implemented according to the special
requirements other than those specified in Table 1, Table 2, Table 3 and Table 4.
4 Length and tolerances
4.1 The full length and short length of hot-rolled round steels and square steels shall
comply with the provisions of Table 5. The tolerance on cut length or multiple length is
൅50
0 mm.
Table 5 -- Full length and short length of hot-rolled round steels and square
steels
In millimeters
4.2 The tolerances on the full length and short length, cut length or multiple length of ......
Related standard:   GB/T 706-2016  GB/T 1499.2-2018
   
 
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