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GB/T 702-2017 English PDF (GBT702-2017)

GB/T 702-2017 English PDF (GBT702-2017)

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GB/T 702-2017: Hot-rolled steel bars -- Dimensions, shape, weight and tolerances

This Standard specifies the cross-sectional shape, cross-sectional dimensions, weight and tolerances, length and tolerances, appearance, etc. of hot-rolled steel bars.
GB/T 702-2017
GB
NATIONAL STANDARD OF THE
PEOPLE 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 Republic of China;
Standardization Administration of the PEOPLE 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 hot-rolled flat steels for general purposes shall comply with the provisions of Table 6. Group 1 Group 2
Tolerance
Group 3
Distance across
flats S
Full length Short length Nominal dimension of cross-section
All specifications
Carbon and alloy
tool steels
a Includes all specifications of high-speed tool steels.
Length of steel bars
Table 6 -- Length of hot-rolled flat steels for general purposes
In millimeters
4.3 The full length and short length of hot-rolled tool flat steels shall comply with the provisions of Table 7. The tolerance on length of hot-rolled tool flat bars delivered on cut length or multiple length is ???1000 mm.
Table 7 -- Full length and short length of hot-rolled tool flat steels
In millimeters
Table 7 (continued)
In millimeters
4.4 The full length and short length of hot-rolled hexagonal steels and hot-rolled octagonal steels shal...

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