GB/T 25052-2024 PDF English
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| GB/T 25052-2024 | English | 320 |
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Dimension, shape, weight and tolerance for continuously hot-dip coated steel sheet and strip
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| GB/T 25052-2010 | English | 190 |
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Continuously hot-dip coated steel sheet and strip - Tolerances on dimensions, shape and weight
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GB/T 25052-2024: Dimension, shape, weight and tolerance for continuously hot-dip coated steel sheet and strip
---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/GBT25052-2024
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 77.140.50
CCS H 46
Replacing GB/T 25052-2010
Dimension, shape, weight and tolerance for continuously
hot-dip coated steel sheet and strip
Issued on. AUGUST 23, 2024
Implemented on. MARCH 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Classification and codes... 7
5 Dimensions... 8
5.1 Dimension range... 8
5.2 Recommended nominal dimensions... 8
6 Tolerances on dimensions... 8
6.1 Tolerance on thickness... 8
6.2 Tolerance on width... 11
6.3 Tolerance on length... 12
7 Appearance... 13
7.1 Flatness tolerance... 13
7.2 Camber... 13
7.3 Out-of-squareness... 14
7.4 Telescoping... 14
8 Measurement of dimensions and shapes... 14
8.1 Thickness... 14
8.2 Width... 14
8.3 Length... 14
8.4 Flatness tolerance... 15
8.5 Camber... 15
8.6 Out-of-squareness... 16
9 Weight... 17
10 Rounding off of numerical values... 18
References... 19
1 Scope
This document specifies the classification and designation, dimensions, dimensional
tolerances, shapes, measurement of dimensions and shapes, weights and numerical
rounding of continuously hot-dip coated steel sheets and strips.
This document is applicable to continuous hot-dip coated wide strips and their sheared
steel plates (hereinafter referred to as steel plates) and slit wide strips with a nominal
thickness not exceeding 6.5 mm.
2 Normative references
The provisions of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for referenced
documents with dates, only the versions corresponding to the dates are applicable to
this document; for referenced documents without dates, the latest versions (including
all amendments) are applicable to this document.
GB/T 8170 Rules of rounding off for numerical values & expression and judgment
of limiting values
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 wide strip
Steel strip with a rolling width of not less than 600 mm and delivered in coils.
3.2 slit wide strip
Steel strip cut longitudinally from a wide strip (3.1) and delivered in coils.
3.3 nominal(specified) thickness
Ordering thickness of coated products.
4 Classification and codes
4.1 The classification and codes according to edge state are as follows.
4.2 The classification and codes according to dimensional precision are as follows.
4.3 The classification and codes according to flatness precision are as follows.
4.4 The classification of dimensional precision and flatness precision corresponding to
product forms is shown in Table 1.
5 Dimensions
5.1 Dimension range
5.1.1 The nominal thickness of wide strips, steel sheets and slit wide strips shall not
exceed 6.50 mm.
5.2 Recommended nominal dimensions
5.2.1 The nominal thickness of wide strips, steel sheets and slit wide strips is within the
range specified in 5.1.
5.2.2 The nominal width of wide strips, steel sheets and slit wide strips shall be any
dimension in multiples of 10 mm.
6 Tolerances on dimensions
6.1 Tolerance on thickness
6.1.1 The tolerances on thicknesses of wide strips, steel sheets and slit wide strips with
the specified minimum yield strength of less than 260 MPa shall comply with the
provisions of Table 2.
6.1.2 The tolerances on thickness of wide strips, steel sheets and slit wide strips with
the specified minimum yield strength not less than 260 MPa and less than 360 MPa
shall comply with the provisions of Table 3.
6.1.3 The tolerances on thickness of wide strips, steel sheets and slit wide strips with
the specified minimum yield strength of not less than 360 MPa and less than or equal
to 420 MPa shall comply with the provisions of Table 4.
6.1.5 When the yield strength and tolerance on thickness are not specified in the
document specifying the product requirements, the tolerances on thickness of wide
strips, steel sheets and slit wide strips shall be negotiated by the supplier and the buyer
and shall be indicated in the contract.
6.2 Tolerance on width
6.2.1 The tolerances on widths of wide strips and steel sheets with cut edges shall
comply with the provisions of Table 6.The tolerances on widths of steel sheets and
wide strips with mill edges shall be determined by negotiation between the supplier and
the buyer.
6.2.3 If the buyer requires delivery with a high precision width (PW.B), this shall be
specified in the contract. If not specified, delivery will be based on the common
precision width (PW.A).
6.3 Tolerance on length
The tolerances on lengths of steel sheets shall comply with the provisions of Table 8.
7 Appearance
7.1 Flatness tolerance
7.1.1 The flatness tolerances of steel sheets shall comply with the provisions of Table
9.If the buyer requires the supply of high precision flatness (PF.B), it shall be indicated
in the contract. If not indicated, the supply shall be based on the common precision
flatness (PF.A).
7.1.2 When the yield strength and the flatness tolerance are not specified in the
document specifying the product requirements, the flatness tolerance of the steel sheet
shall be determined by negotiation between the supplier and the buyer and shall be
stated in the contract.
7.2 Camber
The camber of wide strips and steel sheets shall not exceed 5 mm over any 2,000 mm
length; when the length of a steel sheet is less than 2,000 mm, its 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 over any 2,000 mm length.
7.3 Out-of-squareness
The steel sheet shall be cut into right angles, and the out-of-squareness shall not exceed
1% of the actual width of the steel sheet when measured by the projection method;
7.4 Telescoping
Wide strips and slit wide strips shall be firmly rolled, and the telescoping height on one
side of the wide strip and slit wide strip rolls shall comply with the requirements of
Table 10.
8 Measurement of dimensions and shapes
8.1 Thickness
The wide strips and steel sheets with mill edges shall be measured at a distance of not
less than 40 mm from the rolled edge; wide strips and steel sheets with cut edges shall
be measured at a distance of not less than 25 mm from the sheared edge.
8.2 Width
It shall be measured in a direction perpendicular to the center line of the steel sheet,
wide strip or slit wide strip.
8.4 Flatness tolerance
8.5 Camber
The camber of wide strip, steel sheet and slit wide strip refers to the maximum distance
between the side and the straight line connecting the two end points of the measured
part, measured on the concave side of the product, as shown in Figure 2.
Description of indexing numbers.
8.6 Out-of-squareness
The out-of-squareness of the steel sheet is measured by one of the following two
methods.
9 Weight
9.1 Steel sheets shall be delivered according to theoretical or actual weight, and wide
strips and slit wide strips shall be delivered according to actual weight.
9.2 When steel sheets are delivered according to theoretical weight, the theoretical
weight shall be calculated based on the nominal dimensions.
9.3 The nominal thickness of the coating is calculated according to formula (1).
10 Rounding off of numerical values
The measurement results are rounded off according to the rounding value comparison
method, and the rounding rules are in accordance with the provisions of GB/T 8170.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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