GB/T 25052-2024 (GB/T25052-2024, GBT 25052-2024, GBT25052-2024) & related versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Similar PDF |
| GB/T 25052-2024 | English | 320 |
Add to Cart
|
0-9 seconds. Auto delivery.
|
Dimension,shape,weight and tolerance for continuously hot-dip coated steel sheet and strip
|
GB/T 25052-2024
| Valid |
GBT 25052-2024
|
| GB/T 25052-2010 | English | 190 |
Add to Cart
|
0-9 seconds. Auto delivery.
|
Continuously hot-dip coated steel sheet and strip -- Tolerances on dimensions, shape and weight
|
GB/T 25052-2010
| Valid |
GBT 25052-2010
|
Buy with any currencies (Euro, JPY, KRW...): GB/T 25052-2024 Preview this PDF: GB/T 25052-2024
GB/T 25052-2024
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
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents.
This document replaces GB/T 25052-2010 Continuously hot-dip coated steel sheet and
strip - Tolerances on dimensions, shape and weight. Compared with GB/T 25052-2010,
in addition to structural adjustments and editorial modifications, the main technical
changes are as follows:
a) The note in the Scope is deleted (see Chapter 1 of the 2010 edition);
b) Terms and definitions are added (see Chapter 3);
c) The dimensional precision classifications of wide strips, steel sheets and slit
wide strips are changed from "advanced" to "high" (see 4.2 and Tables 2~9;
see 3.1 and Tables 1~9 of the 2010 edition);
d) The dimensional and flatness precision classification corresponding to the
product form is added (see Table 1);
e) The requirements for the upper limit of the nominal width of wide strips, steel
sheets and slit wide strips are added (see 5.1.2);
f) The requirements for the upper and lower limits of the nominal length of steel
sheets are added (see 5.1.3);
g) The requirements for the recommended nominal dimensions of wide strips,
steel sheets and slit wide strips are added (see 5.2);
h) The requirements for tolerances on thicknesses of wide strips, steel sheets and
slit wide strips are modified (see Tables 2~5; see Tables 1~4 of the 2010
edition);
i) The requirements for the flatness tolerance of steel sheets with a minimum
yield strength value of less than 260 MPa and a nominal thickness of 3.0
mm~6.5 mm are modified (see Table 9; see Table 8 and Table 9 of the 2010
edition);
j) The requirements for the flatness tolerance of steel sheets with a minimum
yield strength value of not less than 360 MPa are modified (see Table 9; see
4.4.3 of the 2010 edition);
Dimension, shape, weight and tolerance for continuously
hot-dip coated steel sheet and strip
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.
[Source: GB/T 708-2019, 3.1]
3.2 slit wide strip
Steel strip cut longitudinally from a wide strip (3.1) and delivered in coils.
[Source: GB/T 708-2019, 3.2]
3.3 nominal(specified) thickness
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.
5.1.2 The nominal width of wide strips, steel sheets and slit wide strips shall not exceed
2080 mm.
5.1.3 The nominal length of steel sheets is 1000 mm~8000 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. For steel sheets and steel strips with a nominal thickness of less
than 1.00 mm, any dimension shall be a multiple of 0.05 mm; for steel sheets and steel
strips with a nominal thickness of not less than 1.00 mm, any dimension shall be a
multiple of 0.10 mm.
5.2.2 The nominal width of wide strips, steel sheets and slit wide strips shall be any
dimension in multiples of 10 mm.
5.2.3 The nominal length of steel sheets shall be within the range specified in 5.1 and
any dimension shall be a multiple of 50 mm.
5.2.4 Based on the requirements of the buyer and after negotiation between the supply
and demand parties, wide strips, steel sheets and slit wide strips of other dimensions
can be supplied.
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.
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):
where:
tz -- nominal thickness of the coating, in micrometers (μm);
mz -- double-sided coating weight, in grams per square meter (g/m2);
d -- density, in grams per cubic centimeter (g/cm3).
9.4 The density of the coating may be as follows:
a) The density of pure zinc and zinc-iron alloy coatings is 7.10 g/cm3;
b) The density of the zinc-aluminum alloy coating is 6.60 g/cm3 (the mass
fraction of aluminum in the molten zinc-aluminum alloy solution is 5%);
c) The density of the aluminum-zinc alloy coating is 3.80 g/cm3 (the mass
fraction of aluminum in the molten aluminum-zinc alloy solution is 55%, and
the mass fraction of silicon is 1.6%);
d) The density of the aluminum-silicon alloy coating is 3.03 g/cm3 (the mass
fraction of silicon in the molten aluminum-silicon alloy solution is 5%~11%);
e) The density of the zinc-aluminum-magnesium alloy coating is calculated
according to formula (2):
where:
d -- density, in grams per cubic centimeter (g/cm3);
xZn -- mole fraction of zinc in zinc-aluminum-magnesium alloy;
xAl -- mole fraction of aluminum in zinc-aluminum-magnesium alloy;
xMg -- mole fraction of magnesium in zinc-aluminum-magnesium alloy.
......
GB/T 25052-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Continuously hot-dip coated steel sheet and strip -
Tolerances on dimensions, shape and weight
ISSUED ON. SEPTEMBER 2, 2010
IMPLEMENTED ON. JUNE 1, 2011
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Classifications and codes... 4
4 Dimensions, shapes, and tolerances... 5
5 Weights... 10
6 Measurement of dimensions and shapes... 11
7 Rounding of numerical values... 12
Continuously hot-dip coated steel sheet and strip -
Tolerances on dimensions, shape and weight
1 Scope
This standard specifies the dimensions, shapes, weights, and tolerances of continuously
hot-dip coated steel sheets and strips.
This standard is applicable to continuously hot-dip coated wide steel strips with a
thickness of not more than 6.5 mm and their original steel sheets (hereinafter referred
to as steel sheets) and longitudinally cut steel strips.
Note. Thickness refers to the final product thickness including plating.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 8170 Rules of rounding off for numerical values & expression and judgment
of limiting values
3 Classifications and codes
3.1 According to dimensional precision, steel sheets and strips are classified into.
Ordinary thickness precision PT. A
Advanced thickness precision PT. B
Ordinary width precision PW. A
Advanced width precision PW. B
Ordinary length precision PL. A
Advanced length precision PL. B
3.2 According to roughness precision, steel sheets and strips are classified into.
5 Weights
Steel sheets are delivered by theoretical or actual weights, and steel strips are delivered
by actual weights.
5.1 When a steel sheet is delivered by the theoretical weight, the theoretical weight shall
be calculated by the nominal sizes.
5.2 Weight calculation method for theoretical weights
5.2.1 Calculation method of the nominal thickness of a coating
Nominal coating thickness = [sum of the nominal weights of two-sided coatings
(g/m2)/50(g/m2)] × r × 10-3(mm)
r is the characteristic value of the coating material, such as the characteristic value of
zinc, zinc-iron alloy coating is 7.1, and the density coefficient of aluminum-zinc (55%
Al) coating is 13.3.
5.2.2 The weight calculation method for the theoretical weight of a steel sheet shall be
as specified in Table 10.
6 Measurement of dimensions and shapes
6.1 Thickness
The thickness shall be measured at a distance of not less than 40 mm from the edge.
6.2 Width
The width shall be measured perpendicularly to the steel sheet or the centerline of the
steel sheet.
6.3 Length
The length shall be measured parallelly to the longitudinal axis of the product.
6.4 Roughness
The maximum distance without contact between the steel sheet and a flat horizontal
surface is the roughness tolerance, as shown in Figure 1.
6.5 Bevel cut
The bevel cut is the vertical projection length of the width-direction side of the steel
sheet to the edge in the rolling direction, or half of the difference between the diagonals
of the steel sheet, as shown in Figure 2.
......
| Standard ID | GB/T 25052-2024 (GB/T25052-2024) | | Description (Translated English) | Dimension, shape, weight and tolerance for continuously hot-dip coated steel sheet and strip | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H46 | | Word Count Estimation | 20,241 | | Date of Issue | 2024-08-23 | | Date of Implementation | 2024-08-23 | | Administrative Organization | National Technical Committee on Steel Standardization (SAC/TC 183) | | Proposing organization | China Light Industry Federation | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | | Standard ID | GB/T 25052-2010 (GB/T25052-2010) | | Description (Translated English) | Continuously hot-dip coated steel sheet and strip. Tolerances on dimensions, shape and weight | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H46 | | Classification of International Standard | 77.140.50 | | Word Count Estimation | 10,130 | | Date of Issue | 2010-09-02 | | Date of Implementation | 2011-06-01 | | Quoted Standard | GB/T 8170 | | Drafting Organization | Benxi Iron and Steel (Group) Co., Ltd. | | Administrative Organization | National Steel Standardization Technical Committee | | Regulation (derived from) | National Standard Approval Announcement 2010 No.4 (Total No.159) | | Proposing organization | China Iron and Steel Association | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies the size of the continuous hot galvanized steel sheet and strip, shape, weight and tolerances. This standard applies to a thickness no greater than 6. 5 mm continuous hot wide strip and cutting edge layer steel (hereinafter referred to as steel), longitudinal strips. Note: The thickness refers to the thickness of the lizard, including Tan Bee layers including. |
|