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GB/T 709-2006 PDF in English


GB/T 709-2006 (GB/T709-2006, GBT 709-2006, GBT709-2006)
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GB/T 709-2006: PDF in English (GBT 709-2006)

GB/T 709-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Replacing GB/T 709-1988
Dimension, Shape, Weight and Tolerances
for Hot Rolled Plates and Sheets
(ISO 7452.2002(E) Hot-rolled Structural Steel Plates - Tolerance on
Dimensions and Shape; ISO 16160.2000(E) Continuously Hot-rolled Steel
Products - Dimensional and Shape Tolerances, NEQ)
ISSUED ON. NOVEMBER 1, 2006
IMPLEMENTED ON. FEBRUARY 1, 2007
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
1 Scope ... 5 
2 Normative References ... 5 
3 Terms and Definitions ... 5 
4 Classification and Code Name ... 6 
5 Dimension ... 6 
6 Dimension Tolerance ... 7 
7 Shape ... 12 
8 Dimensional metrology ... 14 
9 Weight ... 16 
Foreword
This standard is not equivalent to ISO 7452.2002 (E) Hot-rolled Structural
Steel Plates - Tolerance on Dimensions and Shape; ISO 16160.2000 (E)
Continuously Hot-rolled Steel Products - Dimensional and Shape Tolerances.
This standard replaces GB/T 709 -1988 Dimension, Shape, Weight and
Tolerances for Hot Rolled Sheets and Plates.
Compared with the previous standard, this standard is mainly revised in the
following parts.
- Delete the nominal dimension table of steel plates and strips but specify
the dimension range and recommended nominal dimension;
- The steel plate thickness increases to 400mm, and the width increases
to 5000mm; The steel strip width increases to 2,200mm;
- Tighten the thickness tolerance for the thicker and wider steel plates as
well as the width tolerance of steel strips;
- The plus and minus tolerances of the longitudinal-cutting steel strip is
replaced with plus tolerance;
- Adjust the length tolerance;
- The unevenness of the single rolled steel plate, the measured length
shall be 1m or 2m;
- The unevenness of the continuously rolled steel plate shall be stipulated
singly and the measured length shall be physical length;
- The measured length of the sickle curvature is changed into any
5,000mm or physical length; specify the sickle curvature of the
longitudinal-cutting steel strip;
- Tighten the height of the coiling steel strip tower;
- specify all kinds of dimensional metrologies and attach measurement
graphic illustrations;
- Specify the thickness for weighing the limited tolerance or
plus-tolerance steel plate theory.
Dimension, Shape, Weight and Tolerances for Hot
Rolled Plates and Sheets
1    Scope 
This standard specifies the dimension, shape, weight and tolerances for
hot-rolled sheets and plates.
This standard is applicable to the single-sheet rolled steel plate (hereinafter
referred to as "single rolled steel plate"), steel strip and its shear steel plates
(hereinafter referred to as "continuously rolled steel plate") and
longitudinal-cutting steel strip, of which the rolling width is not less than
600mm.
2    Normative References 
The following standards contain the provisions which, through reference in this
text, constitute the provisions of this standard. For dated reference,
subsequent amendments (excluding corrigendum) or revisions of these
publications do not apply. However, the parties who enter into agreement
according to these specifications are encouraged to study whether the latest
editions of these references are applicable. For undated references, the latest
edition of the normative document is applicable to this standard.
GB/T 8170 Rules for Rounding-off of Numerical Values
3    Terms and Definitions 
For the purposes of this standard, the following terms and definitions are
applicable.
3.1 Steel plate or sheet
The steel plate or sheet is referred to the hot-rolled flat steel products with
instable edges, including directly-rolled single rolled steel plate and the
continuously rolled steel plate cutting from the wide steel strip.
3.2 Steel strip
The steel strip is referred to as the wide steel strip whose rolling width is not
less than 600mm and that is delivered in coils.
4    Classification and Code Name 
4.1 Classification according to the edge conditions
Cut edge EC;
Mill edge EM.
4.2 Classified according to the thickness tolerance
N-type tolerance. the plus tolerance is equal to the minus tolerance;
A-type tolerance. the minus tolerance specified according to the normal
thickness;
B-type tolerance. the fixed minus tolerance is 0.3mm;
C-type tolerance. the fixed minus tolerance is zero, the plus tolerance
specified according to the normal thickness.
4.3 Classified according to the thickness precision
Common thickness precision. PT.A;
Higher thickness precision. PT.B.
5    Dimension 
5.1 Dimension range of steel plates (sheets) and steel strips
Normal thickness of single rolled steel plate. 3mm-400mm;
Nominal width of single rolled steel plate. 600mm-4,800mm
Nominal length of steel plate. 2,000-20,000mm;
Normal thickness of steel strip (including continuously rolled steel plate).
0.8mm-25.4mm
Nominal width of steel strip (including continuously rolled steel plates).
600mm-2200mm;
Nominal width of longitudinal-cutting steel strip. 120mm-900mm.
5.2 Recommended nominal dimension of steel plates (sheets) and steel
strips
5.2.1 The normal thickness of the single rolled steel plate shall be within the
specified range stated in Article 5.1, the steel plate whose thickness is less
than 30mm shall subject to any dimension according to 0.5mm multiple; the
steel plate whose thickness is not less than 30mm shall subject to any
dimension according to 1mm multiple.
5.2.2 The nominal width of single rolled steel plate within the specified range
stated in Article 5.1 shall subject to any dimension according to 10mm or
50mm multiples.
5.2.3 The normal thickness of steel strip (including continuously rolled steel
plate) within the range stated in Article 5.1 shall subject to any dimension
according to 0.1mm multiple.
5.2.4 The nominal width of steel strips (including continuously rolled steel
plates) within the range stated in Article 5.1 shall subject to any dimension
according to 10mm multiple.
5.2.5 The length of steel plate within the specified range stated in Article 5.1
shall subject to any dimension according to 50mm or 100mm multiples.
5.2.6 According to the purchaser's requirements, the steel plates (sheets) and
steel strips out of the recommended nominal dimensions can be supplied upon
being agreed by both the supplier and the purchaser.
6    Dimension Tolerance 
When examining the thickness and width of the mill-edge steel strips, the total
unexamined length of both ends, L shall be.
L(m) = 90/Normal thickness(mm)
However, the maximum total length of both ends shall not be greater than
20m.
6.1 Thickness tolerance
6.1.1 The thickness tolerance of the single rolled steel plate shall be compliant
to the provisions of Table 1 (N-type).
6.1.2 According to the purchaser's requirements and indicating the tolerance
type in the contract, the single rolled steel plate of other tolerance type whose
tolerance value is equal to that stated in Table 1 can be supplied, such as
A-type, B-type and C-type tolerance stated in Table 2 - Table 4; the single
600-1200 >1200-1500 >1500-1800 >1800 600-1200 >1200-1500 >1500-1800 >1800
0.8-1.5 ±0.15 ±0.17 - - ±0.10 ±0.12 - -
>1.5-2.0 ±0.17 ±0.19 ±0.21 - ±0.13 ±0.14 ±0.14 -
>2.0-2.5 ±0.18 ±0.21 ±0.23 ±0.25 ±0.14 ±0.15 ±0.17 ±0.20
>2.5-3.0 ±0.20 ±0.22 ±0.24 ±0.26 ±0.15 ±0.17 ±0.19 ±0.21
>3.0-4.0 ±0.22 ±0.24 ±0.26 ±0.27 ±0+17 ±0.18 ±0.21 ±0.22
>4.0-5.0 ±0.24 ±0.26 ±0.28 ±0.29 ±0.19 ±0.21 ±0.22 ±0.23
>5.0-6.0 ±0.26 ±0.28 ±0.29 ±0.31 ±0.21 ±0.22 ±0.23 ±0.25
>6.0-8.0 ±0.29 ±0.30 ±0.31 ±0.35 ±0.23 ±0.24 ±0.25 ±0.28
>8.0-10.0 ±0.32 ±0.33 ±0.34 ±0.40 ±0.26 ±0.26 ±0.27 ±0+32
>10.0-12.5 ±0.35 ±0.36 ±0.37 ±0.43 ±0.28 ±0.29 ±0.30 ±0.36
>12.5-15.0 ±0.37 ±0.38 ±0.40 ±0.46 ±0.30 ±0.31 ±0+33 ±0.39
>15.0-25.4 ±0.40 ±0.42 ±0.45 ±0.50 ±0.32 ±0.34 ±0+37 ±0.42
a For the steel strip of specified minimum yield strength R≥345 MPa, the thickness tolerance
shall increase by 10%.
6.2 Width tolerance
6.2.1 The width tolerance of the cut-edge single rolled steel plate shall comply
with the provisions of Table 6.
Table 6 Width tolerance of cut-edge single rolled steel plate In. mm
Normal thickness Nominal width Allowable deviation
3-16
≤1500 +10 0
>1500 +15 0
>16
≤2 000 +20 0
>2000-3000 +25 0
>3 000 +30 0
6.2.2 The width tolerance of the mill-edge single rolled steel plate shall be
agreed by both the purchaser and the supplier.
6.2.3 The thickness tolerance of the mill-edge steel strip (including
continuously rolled steel plate) shall comply with the provisions stated Table 7.
Table 7 Thickness tolerance of mill-edge steel strip (including
continuously rolled steel plate) In. mm
Nominal width Allowable deviation
≤1500 +20 0
>1500 +25 0
>20 00...
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.