Q/BQB 301-2023 PDF in English
Q/BQB 301-2023 (Q/BQB301-2023, QBQB 301-2023, QBQB301-2023)
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Dimension, shape, weight and tolerances for continuously hot-rolled steel sheet and strip
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| Q/BQB 301-2009 | English | 170 |
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Hot-rolled steel sheets and strips - Dimensions, shape, weight and tolerances
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Standards related to (historical): Q/BQB 301-2023
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Q/BQB 301-2023: PDF in English (QBQB 301-2023) Q/BQB 301-2023
BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON AND STEEL CO., LTD
Replacing Q/BQB 301-2019
Dimension, Shape, Weight and Tolerances for Continuously
Hot-Rolled Steel Sheet and Strip
ISSUED ON: APRIL 9, 2023
IMPLEMENTED ON: JULY 1, 2023
Issued by: Baoshan Iron and Steel Co., Ltd.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Classification and Code ... 4
5 Dimensions ... 5
6 Tolerance of Size ... 6
7 Shape ... 10
8 Measurement of Size and Shape ... 12
9 Weight ... 13
10 Numerical Rounding Rules ... 13
Appendix A (Normative) Weight Calculation Method by Theoretical Weight ... 15
Dimension, Shape, Weight and Tolerances for Continuously
Hot-Rolled Steel Sheet and Strip
1 Scope
This Document specifies dimension, shape, weight and tolerances for continuously hot-rolled
steel sheet and strip.
This Document applies to hot-rolled steel strips produced by Baoshan Iron and Steel Co., Ltd.,
as well as steel sheets transversely cut from steel strips and longitudinally cut steel strips,
hereinafter referred to as steel sheets and steel strips.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in 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 Document.
GB/T 709 Dimensions, shape, weight and tolerances for hot rolled steel sheets and strips
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of
limiting values
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 709 apply.
4 Classification and Code
4.1 It can be classified as follows according to the edge state:
a) Edge-cutting, EC;
b) Edge-milling, EM.
4.2 It can be classified as follows according to the thickness precision:
a) Ordinary thickness precision, PT.A;
b) Higher thickness precision, PT.B;
c) Advanced thickness precision, PT.C.
4.3 For the edge-milling steel sheets and strips, which can be classified as follows
according to the width precision:
a) Ordinary width precision, PW.A;
b) Higher width precision, PW.B.
4.4 For steel sheets, which can be classified according to the unevenness precision:
a) Ordinary unevenness precision, PF.A;
b) Higher unevenness precision, PF.B.
4.5 It can be classified as follows according to the surface treatment method:
a) Pickled surface;
b) Rolled surface.
4.6 It can be classified as follows according to the product category:
a) Hot-rolled steel strip;
b) Hot-rolled steel sheet;
c) Hot-rolled and heat-treated steel sheets;
d) Hot-rolled flat steel strip;
e) Hot-rolled slit steel strip;
f) Hot-rolled pickled steel strip;
g) Hot-rolled pickled steel sheet.
5 Dimensions
5.1 The nominal size ranges of steel sheets and strips are listed in Table 1.
5.2 Normally, the recommended nominal width of slit steel strip is any size in multiples of
20mm within the range listed in Table 1.
8.3 Unevenness
8.3.1 Unevenness of steel sheet
Place the steel sheet freely on the platform, without applying any pressure except the weight of
the steel sheet itself, and measure the maximum distance between the lower surface of the steel
sheet and the plane, as shown in Figure 1.
8.3.2 Unevenness of hot-rolled flat steel strips
Place the measuring part of the steel strip freely on the platform, without applying any pressure
except the weight of the measuring part of the steel strip. Use a ruler with a length of 1000mm,
in the longitudinal direction within an area no less than 40mm from the longitudinal edge of
the steel strip, to measure the maximum distance between the upper surface of the steel strip
and the ruler.
8.4 Cambering
The maximum distance between the concave side of the steel sheet or strip and the straight line
connecting the two end points of the measuring part, as shown in Figure 2. For steel sheets with
a length L< 5000mm, the measured length of the steel sheet is the actual length; for steel sheets
with a length L≥5000mm, the measured length of the steel sheet is any 5000mm.
8.5 Out-of-squareness degree (beveling)
The vertical projection of the transverse edge of the steel sheet on the longitudinal edge (as
shown in Figure 3); or one-half the difference between the diagonals of the steel sheet.
9 Weight
9.1 Steel sheets are delivered according to theoretical or actual weight; and steel strips are
delivered according to actual weight.
9.2 When the steel plate is delivered according to the theoretical weight, the thickness used in
the theoretical weight calculation is the average of the allowable maximum thickness and the
allowable minimum thickness; and the width and length adopt the nominal size values. Unless
otherwise specified in the product standard, the density is 7.85g/cm3. The theoretical weight
calculation method is shown in Appendix A (Normative).
9.3 The weight of different categories of products shall comply with the provisions of Table 14.
10 Numerical Rounding Rules
The numerical judgment adopts the rounding value comparison method, and the numerical
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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