GB/T 708-2019 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 708-2019 | English | 105 |
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Dimension, shape, weight and tolerance for cold-rolled steel strip and sheet
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| GB/T 708-2006 | English | 70 |
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[New version GB/T 708-2019] Dimension, shape, weight and tolerance for cold-rolled steel plates and sheets
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| GB/T 708-1988 | English | 190 |
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Dimensions shape weight and tolerances for cold-rolled plates and sheets
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GB/T 708-2019: Dimension, shape, weight and tolerance for cold-rolled steel strip and sheet---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/GBT708-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 708-2006
Dimension, shape, weight and
tolerance for cold-rolled steel strip and sheet
Issued on. MARCH 25, 2019
Implemented on. FEBRUARY 01, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Classification and code... 6
5 Dimensions... 7
6 Dimension tolerances... 8
7 Shape... 12
8 Measurement of dimensions and shape... 14
9 Weight... 16
10 Rounding off of numerical values... 17
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 708-2006 “Dimension, shape, weight and
tolerance for cold-rolled steel plates and sheets”.
Compared with GB/T 708-2006, the main technical changes of this Standard
are as follows.
- MODIFY the thickness and width ranges of steel sheets and strips (see 5.1
of this Standard, 5.1 of 2006 edition);
- MODIFY the thickness tolerance of steel sheets and strips, which is
specified respectively according to the specified minimum yield strength Re
< 260 MPa, 260 MPa ≤ Re < 340 MPa, 340 MPa ≤ Re ≤ 420 MPa, Re > 420
MPa (see Table 2, Table 3, Table 4, Table 5 of this Standard, Table 2 of
2006 edition);
- ADD the higher precision (PW.B) of width tolerance of slit wide strips and
its requirements; MODIFY the width tolerance of slit wide strips (see 6.2.3
of this Standard, 6.2.2 of 2006 edition);
- MODIFY the flatness of steel sheets and strips according to the specified
minimum yield strength Re < 280 MPa, 280 MPa ≤ Re < 360 MPa, Re < 260
MPa, 260 MPa ≤ Re < 340 MPa; MODIFY the requirements for flatness (see
7.1 of this Standard, 7.1 of 2006 edition);
- ADD the requirement that steel sheets and strips are supplied according to
general precision when the thickness tolerance, width tolerance, length
tolerance and flatness are default (see 6.1.6, 6.2.2, 6.3, 7.1.1);
- ADD the negotiation terms when the yield strength and requirements are
not specified in the thickness tolerance and flatness requirements of steel
sheets and strips in the product standard (see 6.1.5, 7.1.5);
- MODIFY the requirements for camber (see 7.2 of this Standard, 7.2 of 2006
edition);
- MODIFY the “cutting angle” to “out-of-squareness”; ADD the method and
requirements for the measurement of out-of-squareness using the diagonal
method (see 7.3 of this Standard, 7.3 of 2006 edition);
- ADD the requirements for the measurement position of flatness of steel
strips (see 8.3.3);
- ADD the schematic diagram of the measurement of out-of-squareness
using the diagonal method [see 8.5b)].
This Standard was proposed by China Iron and Steel Industry 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. China Metallurgical Information and
Standardization Institute, Tangshan Branch of Hebei Iron and Steel Co., Ltd.,
Guangxi Liuzhou Iron and Steel Group Co., Ltd., Shougang Group Co., Ltd.,
Anshan Iron and Steel Co., Ltd., Baoshan Iron and Steel Co., Ltd.
Main drafters of this Standard. Hou Jie, Zhang Weixu, Li Qian, Deng Cuiqing,
Gan Guiping, Tang Mu, Su Haolu, Hu Ling, Xu Feng, Tan Cuiying.
The previous released versions replaced by this Standard are as follows.
- GB 708-1965, GB 708-1988, GB/T 708-2006.
Dimension, shape, weight and
tolerance for cold-rolled steel strip and sheet
1 Scope
This Standard specifies terms and definitions, classification and code,
dimensions, dimension tolerances, shape requirements, measurement of
dimensions and shape, weight and rounding off of numerical values of cold-
rolled steel sheets and strips.
This Standard applies to cold-rolled wide strips, slit wide strips and sheets cut
from strip of which the rolling width is not less than 600 mm (hereinafter referred
to as steel sheets and strips). Steel plates may also refer to this Standard.
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 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
wide strip
Steel strips with a width of not less than 600 mm and delivered in rolls.
3.2
slit wide strip
Slit from wide strips and delivered in rolls.
3.3
sheet cut from strip
Cut form steel strips and delivered in sheets.
4 Classification and code
4.1 Classification according to edge state is as follows.
4.2 Classification according to dimension precision and code is as follows.
4.3 Classification according to flatness precision and code is as follows.
4.4 Classification of dimensions and precision of flatness corresponding to
product shape and edge state is shown in Table 1.
5 Dimensions
5.1 Dimension range
5.1.1 The nominal thickness of steel sheets and strips is not more than 4.00 mm.
5.1.2 The nominal width of steel sheets and strips is not more than 2150 mm.
5.2 Recommended nominal dimensions
5.2.1 The nominal thickness of steel sheets and strips shall be within the range
specified in 5.1.
5.2.2 The recommended nominal width of steel sheets and strips is any
dimension in multiples of 10 mm.
5.2.3 The nominal length of steel sheets is within the range specified in 5.1.The
recommended nominal length is any dimension in multiples of 50 mm.
6 Dimension tolerances
6.1 Thickness tolerance
6.1.1 The thickness tolerance of steel sheets and strips of which the minimum
yield strength Re is less than 260 MPa shall comply with the requirements of
Table 2.
6.1.5 When the yield strength is not specified in the product standard and the
thickness tolerance is not specified, the thickness tolerance of steel sheets and
strips shall be agreed upon between the supply and demand parties and
indicated in the contract.
6.2 Width tolerance
6.2.1 The width tolerance of cut-edge steel sheets and wide strips shall comply
with the requirements of Table 6.The width tolerance of mill-edge steel sheets
and wide strips shall be agreed upon between the supply and demand parties.
6.3 Length tolerance
The length tolerance of steel sheets shall comply with the requirements of Table
8.If the demand party requires supply according to the higher precision of
length (PL.B), it shall be indicated in the contract. If not indicated, supply
according to the general precision of length (PL.A).
7 Shape
7.1 Flatness
7.1.1 The flatness of steel sheets shall comply with the requirements of Table
9.If the demand party requires supply according to the higher precision of
flatness (PF.B), it shall be indicated in the contract. If not indicated, supply
according to the general precision of flatness (PF.A).
7.1.4 When the user has requirements for the flatness of steel strips, after the
user has fully flattened the steel strips, the values specified in Table 9 are also
applicable to steel sheets cut by the user from the steel strips.
7.1.5 When the yield strength is not specified in the product standard and the
flatness is not specified, the flatness of steel sheets and strips shall be agreed
upon between the supply and demand parties and shall be indicated in the
contract.
7.2 Camber
The camber of steel sheets and strips shall not exceed 5 mm in any length of
2000 mm. When the length of the steel sheet is not more than 2000 mm, the
camber shall not exceed 0.25 % of the actual length of the steel sheet. The
camber of slit wide strips shall not exceed 2 mm in any length of 2000 mm.
7.3 Out-of-squareness
Steel sheets shall be cut at a right angle. When measured using the projection
method, the out-of-squareness shall not be greater than 1 % of the actual width
of the steel sheet.
7.4 Tower shape
Steel strips shall be firmly wound into a roll. The height of the tower shape on
one side of the steel strip roll shall comply with the requirements of Table 10.
8 Measurement of dimensions and shape
8.1 Thickness
8.1.1 For mill-edge steel sheets and strips, it is measured at a distance of not
less than 40 mm from the rolling side. For cut-edge steel sheets and strips, it is
measured at a distance of not less than 25 mm from the cutting side.
8.2 Width
The width shall be measured at where perpendicular to the centerline of steel
sheets and strips.
8.3 Flatness
8.3.1 Place the steel sheet freely on a platform. Except for the weight of the
steel sheet itself, do not apply any pressure. Measure the maximum distance
between the lower surface of the steel sheet and the platform, as shown in
Figure 1.
8.3.2 If limited by the length of the test platform, for steel sheets with a length
greater than 2000 mm, it may arbitrarily take 2000 mm for the measurement of
flatness instead of measuring the flatness of full length.
8.4 Camber
The camber of steel sheets and strips refers to the maximum distance between
the side and the straight line connecting the two ends of the measuring portion.
It is measured on the concave side of the product, as shown in Figure 2.
9 Weight
9.1 Steel sheets are delivered according to theoretical or actual weight. Steel
strips are delivered according to actual weight.
9.2 When steel sheets are delivered according to theoretical weight, the
theoretical weight is calculated using nominal dimensions and the carbon steel
density of 7.85 kg/dm3.Other steel grades are weighted according to the
corresponding standards.
9.3 The theoretical weight of steel sheets is calculated according to the
calculation method specified in Table 11.
10 Rounding off of numerical values
The measurement results are rounded off according to the rounded off value
comparison method.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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