Q/BQB 301-2009 English PDF (QBQB301-2009)

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Q/BQB 301-2009: Hot-rolled steel sheets and strips - Dimensions, shape, weight and tolerances
Q/BQB 301-2009
Q/BQB
ENTERPRISE STANDARD OF
BAOSHAN IRON and STEEL CO., LTD.
Replacing Q/BQB 301-2003
Dimension, shape, weight and tolerance for
hot-rolled steel plate and strip
Issued on. May 21, 2009 Implemented before. December 31, 2009
BAOSHAN IRON and STEEL CO., LTD.
Table of Contents
1 Scope ... 3
2 Normative references ... 3
3 Classification and code ... 3
4 Dimension ... 4
5 Dimension tolerance ... 5
6 Shape ... 8
7 Measurements of dimension and shape ... 9
8 Weight ... 10
9 Rounding method of numerical value ... 11
Appendix A ... 12
Additional explanation ... 13
Dimension, shape, weight and tolerance for hot-rolled
steel plate and strip
1 Scope
This Standard specifies the dimension, shape, weight and tolerance for hot-
rolled steel plate and strip.
This Standard is applicable to hot-rolled steel strip, steel plate cross-cut from
steel strip as well as straight-cut steel strip that are produced by Baoshan Iron
and Steel Co., Ltd. (hereinafter referred to as steel plate and strip).
2 Normative references
The following documents contain provisions which, through reference in this
Standard, constitute the provisions of this Standard. For dated references, all
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest versions of these
documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 8170-2008 Rules of rounding off for numerical values and expression
and judgement of limiting values
3 Classification and code
3.1 Classified according to edge state.
Edge cut. EC
Non-edge cut. EM
3.2 Classified according to rolling precision.
Normal thickness precision. PT.A
High thickness precision. PT.B
3.3 Classified according to surface treatment.
Pickling surface
Rolling surface
3.4 Classified according to product category.
Hot-rolled steel strip
Hot-rolled steel plate
Hot-rolled straight-cut steel strip
Hot-rolled pickling steel strip
Hot-rolled pickling steel plate
4 Dimension
4.1 The scope of nominal dimensions of steel plate and strip is listed in Table 1.
4.2 Recommended nominal dimensions for steel plate and strip
4.2.1 Usually, the nominal width of straight-cut steel strip is any dimension that
is 20 mm times the one listed in Table 1.
4.2.2 Usually, the nominal width of steel plate and strip is any dimension that is
10 mm times the one listed in Table 1.
4.2.3 Usually, the nominal length of steel plate is any dimension that is 100 mm
times the one listed in Table 1.
4.2.4 Usually, the nominal thickness of steel plate and strip is any dimension
that is 0.1 mm times the one listed in Table 1.
4.2.5 According to buyer’s requirements, after negotiation by seller and buyer,
steel plate and strip of other dimensions other than recommended nominal ones
can be provided.
Table 1 Scope of nominal dimensions of steel plates and strips
Surface
treatment Product category
Nominal
thickness
mm
Nominal width
mm
Nominal length of steel
plate or inner diameter of
steel coil
Rolling
surface
Hot-rolled
steel plate
Edge cut
EC 1.2~< 9.0 650~1850
2000~12000
(steel plate length)
6 Shape
6.1 Unevenness
6.1.1 The unevenness tolerance of steel plate shall comply with provisions of
Table 7.
6.1.2 If user has requirements for unevenness of steel strip, it shall be clearly
indicated in the contract, under the premise of ensuring the quality of user’s
unwinding device and after negotiation by both parties.
Table 7 Unevenness tolerance of steel plate mm
Nominal
thickness Nominal width
Unevenness tolerance a
Regulated minimum yield strength
< 220MPa 220~340 MPa >340MPa
≤ 2.0 ≤1200 ≤18 ≤21 ≤26
>1200~1500 ≤20 ≤25 ≤31
>1500 ≤25 ≤30 ≤38
>2.0~25.4 ≤1200 ≤15 ≤18 ≤22
>1200~1500 ≤18 ≤23 ≤29
>1500 ≤23 ≤28 ≤35
a If user has stricter requirements for unevenness, it shall be clearly indicated in the
contract after negotiation by both parties.
6.2 Camber and off squareness (oblique cutting)
6.2.1 For steel strip of uncut head-tail and uncut edge, when checking camber,
the total length L, that does not take length of both ends into assessment, is
calculated according to.
L (m) = 90 / nominal thickness (mm)
However, the maximum total length between both ends shall not exceed 20 m.
6.2.2 The camber and the oblique cutting of steel plate shall ensure the
rectangle of steel plate’s ordered dimension.
6.2.3 The camber tolerance of steel plate and strip shall comply with provisions
of Table 8 and Table 9.
6.2.4 The off squareness (oblique cutting) of steel plate shall not exceed 1% of
steel plate’s actual width.
6.3 The steel strip and straight-cut steel strip shall be firmly tied. Tower
The width shall be measured in the place where it is perpendicular to the center
line of the steel plate or strip.
7.3 Unevenness of steel plate
Place the steel plate freely on flat surface; it shall not apply any other pressure
except the weight of the steel plate; measure the maximum distance between
the lower surface of the steel plate and the flat surface, shown as Figure 1.
7.4 Camber
The maximum distance, BETWEEN the concave side of the steel plate or strip
AND a straight line that connects the two end points of measurement portion,
is shown in Figure 2. For the steel plate of which the length is less than 5000
mm, the measured length shall be the actual length. For the steel plate of which
the length ≥5000 mm, the measured length shall be 5000 mm.
7.5 Off squareness (oblique cutting) u
It is the vertical projection of transverse edges of steel plate onto the longitudinal
edges (shown in Figure 3), or 1/2 of steel plate's diagonal difference.
8 Weight
8.1 Steel plate is delivered according to its theoretical weight or actual weight.
Steel strip is delivered according to its actual weight.
8.2 When steel plate is delivered according to theoretical weight, the thickness
adopted by theoretical weighing shall be the average of the allowed maximum
thickness and minimum thickness. The width and length shall adopt nominal
dimension value. Unless otherwise specified in the product standard, the
density shall adopt 7.85 g/cm3. The calculation of theoretical weighing is shown
in Annex A (normative).
8.3 The weight of product in different category shall comply with provisions of
Table 12.
Appendix A
(normative)
Calculation of theoretical weighing
Table A.1
Calculation order Calculation method Result rounding
Basic weight
kg/(mm. m2)
7.85 (Weight of which the thickness is 1
mm and the area is 1 m2) -
Unit weight
kg/m2
Basic weight kg/(mm. m2) × thickness
(mm) Rounding to four effective digits
Steel plate area
m2 Width (m) × length (m) Rounding to four effective digits
Weight of 1 plate
kg Unit weight (kg/m
2) × steel plate area (m2)
Rounding to three effective
digits; when it is over 1000 kg,
rounding to kg’s integral digits.
Weight of 1 bundle
kg
Weight of 1 plate (kg) × number of 1
bundle of steel plate of same specification Rounding to kg’s integral digits
Total weight
kg Sum of the weight of each bundle kg’s integral digits
Additional explanation
This Standard i...