GB/T 702-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 702-2017 | English | 145 |
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Hot-rolled steel bars - Dimensions, shape, weight and tolerances
| Valid |
| GB/T 702-2008 | English | 75 |
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[Newer version GB/T 702-2017] Hot-rolled steel bars -- Dimensions, shape, weight and tolerances
| Obsolete |
| GB/T 702-2004 | English | 359 |
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Hot-rolled round and square steel bars -- Dimension, Shape, weight and tolerance
| Obsolete |
| GB/T 702-1986 | English | 199 |
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Hot-rolled round and square steels--Dimension, shape, weight and tolerance
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 702-2017
GB/T 702-2017: Hot-rolled steel bars - Dimensions, shape, weight and tolerances---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/GBT702-2017
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
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.
2.2 The cross-sectional shape of hot-rolled flat steels is shown in Figure 2.
2.3 The cross-sectional shape of hot-rolled hexagonal steels and hot-rolled octagonal steels is shown in Figure 3.
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.
3.1.6 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.
4 Length and tolerances
4.2 The tolerances on the full length and short length, cut length or multiple length of
hot-rolled flat steels for general purposes shall comply with the provisions of Table 6.
4.3 The full length and short length of hot-rolled tool flat steels shall comply with the
provisions of Table 7.
4.4 The full length and short length of hot-rolled hexagonal steels and hot-rolled
octagonal steels shall comply with the provisions of Table 8.The tolerance on cut
4.5 Negotiated by both supply and demand parties, and indicated in the contract, the
length of steel bars may be implemented according to the special requirements other
than those specified Table 5, Table 6, Table 7 and Table 8.
4.6 The delivery volume of steel bars of short length shall not exceed 10 % of the total
weight of this batch of steel bars.
5 Shape
5.1 Hot-rolled round steels and square steels
5.1.1 Hot-rolled round steels and square steels are delivered in straight form.
5.1.2 The out-of-roundness of round steels and the diagonal length of square steels
shall comply with the provisions of Table 9.
5.1.3 For the out-of-squareness of square steels, the difference between any two side
lengths in the same cross section shall not be greater than 50 % of the tolerance on
nominal side length, and the difference between the two diagonal lengths shall not be
greater than 70 % of the tolerance on nominal side length.
5.1.5 Hot-rolled square steels shall not be significantly reversed.
5.1.6 The misshaped cutting at both ends of hot-rolled round steels and square steels
shall not be greater than 15 % of the nominal diameter of round steels or the nominal
side length of square steels. Hot-rolled round steel and square steel ends cut with a
shear allow partial deformation.
5.2 Hot-rolled flat steels
5.2.1 For hot-rolled tool flat steels, the curvature per meter shall not exceed 5 mm, the
total curvature shall not be greater than 0.50 % of the total length, the lateral curvature
(camber) per meter shall not exceed 5 mm, and the total lateral curvature shall not be
less than 0.50 % of the total length. The curvature of hot-rolled flat steels for general
purposes shall comply with the provisions of Table 11.
5.2.4 The irregularity of cross-sectional shape of hot-rolled flat steels is as shown in
Figure 4 (a), Figure 4 (b), Figure 4 (c) and Figure 4 (d) below. The maximum allowable
dimension C value shall comply with the provisions of Table 12.
5.2.5 The fillet radius r of hot-rolled flat steels is not taken as delivery inspection basis.
5.3 Hot-rolled hexagonal steels and hot-rolled octagonal steels
5.3.1 For hot-rolled hexagonal steels and hot-rolled octagonal steels, the difference in
distances between any two opposite side lengths in the same cross-section shall not
exceed 70 % of the tolerance.
5.3.3 The curvature of hot-rolled hexagonal steels and hot-rolled octagonal steels shall
comply with the provisions of Table 14.The group of curvature shall be indicated in the
corresponding product standard or order contract, if not indicated, Group 2 shall prevail.
5.3.4 Hot-rolled hexagonal and hot-rolled octagonal ends shall be cut to be straight.
The misshaped cutting length shall not be greater than 15 % of the distance to across
flats of the steel. Ends are cut with a shearing machine, and it allows partial
deformation at ends.
5.3.5 Hot-rolled hexagonal steels and hot-rolled octagonal steels shall not be
significantly reversed.
Annex A
(normative)
Dimensions and theoretical weight of hot-rolled steel bars
The dimensions and theoretical weight of hot-rolled steel bars are shown in Table A.1 ~ Table A.4.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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