GB/T 709-2019_English: PDF (GB/T709-2019)
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Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet
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[New version GB/T 709-2019] Dimension shape weight and tolerances for hot-rolled steel plates and sheets
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| GB/T 709-1988 | English | 359 |
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Dimensions, shape, weight and tolerances for hot-rolled plates and sheets
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GB/T 709-1988
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| Standard ID | GB/T 709-2019 (GB/T709-2019) | | Description (Translated English) | Dimension, shape, weight and tolerance for hot-rolled steel strip, plate and sheet | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H46 | | Classification of International Standard | 77.140.50 | | Word Count Estimation | 18,139 | | Date of Issue | 2019-03-25 | | Date of Implementation | 2020-02-01 | | Drafting Organization | Metallurgical Industry Information Standards Research Institute, Liuzhou Iron and Steel Co., Ltd., Hunan Valin Xiangtan Iron and Steel Co., Ltd., Shougang Group Co., Ltd., Tangshan Ruifeng Iron and Steel (Group) Co., Ltd., Shandong Iron and Steel Group Rizhao Co., Ltd., Baoshan Iron and Steel Co., Ltd., Ansteel Co., Ltd. | | Administrative Organization | National Steel Standardization Technical Committee (SAC/TC 183) | | Proposing organization | China Iron and Steel Association | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | | Standard ID | GB/T 709-2006 (GB/T709-2006) | | Description (Translated English) | [New version GB/T 709-2019] Dimension shape weight and tolerances for hot-rolled steel plates and sheets | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H46 | | Classification of International Standard | 77.140.50 | | Word Count Estimation | 13,128 | | Date of Issue | 2006-11-01 | | Date of Implementation | 2007-02-01 | | Older Standard (superseded by this standard) | GB/T 709-1988 | | Quoted Standard | GB/T 8170 | | Adopted Standard | ISO 7452-2002 (E), NEQ; ISO 16160-2000 (E), NEQ | | Drafting Organization | Metallurgical Industry Information Standards Institute | | Administrative Organization | National Steel Standardization Technical Committee | | Regulation (derived from) | National Standard Approval Announcement 2006 No.11 (Total No.98) | | 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 hot-rolled steel sheet and strip, shape, weight and tolerances. This standard applies to the rolling width of not less than 600mm of rolled steel sheet (hereinafter referred to as single- rolled steel plate), steel slitting and cut sheets and strips. | | Standard ID | GB/T 709-1988 (GB/T709-1988) | | Description (Translated English) | Dimensions, shape, weight and tolerances for hot-rolled plates and sheets | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H46 | | Classification of International Standard | 77.140 | | Word Count Estimation | 9,964 | | Date of Issue | 1988/2/29 | | Date of Implementation | 1989/7/1 | | Older Standard (superseded by this standard) | GB 709-1965 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 11, 2006 (No. 98 overall) | | Issuing agency(ies) | National Bureau of Standards |
GB/T 709-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 709-2006
Dimension, shape, weight and tolerance
for hot-rolled steel strip, plate and sheet
ISSUED ON: MARCH 25, 2019
IMPLEMENTED ON: FEBRUARY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Classification and code ... 6
5 Dimensions ... 6
6 Dimension tolerances ... 7
7 Shape ... 13
8 Measurement of dimensions and shape ... 17
9 Weight ... 20
10 Rounding off of numerical values ... 21
Annex A (informative) Thickness tolerance of plates ... 22
Dimension, shape, weight and tolerance
for hot-rolled steel strip, plate and sheet
1 Scope
This Standard specifies terms and definitions, classification and code,
dimensions, dimension tolerances, shape, measurement of dimensions and
shape of hot-rolled steel plates/sheets and strips.
This Standard applies to plates with a rolling width of not less than 600 mm
(hereinafter referred to plates), wide strips, slit wide strips, and plates/sheets
cut from strips.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
plate
Hot-rolled flat steel that is directly rolled and does not have fixed edge
deformation.
3.2
wide strip
Steel strips with a width of not less than 600 mm and delivered in rolls.
3.3
slit wide strip
Steel strips that are slit from wide strips and delivered in rolls.
3.4
plate/sheet cut from strip
Steel plates/sheets that are cut from wide strips or slit wide strips and delivered
in plates/sheets.
4 Classification and code
4.1 Classification according to edge state is as follows:
a) cut-edge, EC;
b) mill-edge, EM.
4.2 Classification according to thickness tolerance classes and code are as
follows:
a) Class N tolerance: the upper tolerance and the lower tolerance are equal;
b) Class A tolerance: the lower tolerance is specified according to the
nominal thickness;
c) Class B tolerance: the fixed lower tolerance is -0.30 mm;
d) Class C tolerance: the fixed lower tolerance is 0.00 mm.
4.3 Classification according to precision of thickness and code are as follows:
a) general precision of thickness, PT.A;
b) higher precision of thickness, PT.B.
4.4 Classification according to precision of flatness and code are as follows:
a) general precision of flatness, PF.A;
b) higher precision of flatness, PF.B.
5 Dimensions
5.1 Nominal dimension range
Table 2 (Class N).
6.1.1.2 As required by the demand party, and indicating the tolerance class in
the contract, it may supply plates with other tolerance classes and with
tolerance values equal to the tolerance values specified in Table 2, such as
Class A, Class B and Class C tolerances. It may also supply plates of which the
upper tolerance is limited and the tolerance values are equal to the tolerance
values specified in Table 2. The upper and lower tolerances are agreed upon
between the supply and demand parties.
6.1.1.3 For steel plates/sheets with a thickness greater than 200 mm, the
thickness tolerance may also be agreed upon between the supply and demand
parties and specified in the contract.
6.1.1.4 Agreed upon between the supply and demand parties, it may also
supply in accordance with the tolerances given in Annex A.
6.1.2 Thickness tolerance of steel strips (including plates/sheets cut from
strips)
6.1.2.1 The thickness tolerance of steel strips (including plates/sheets cut from
strips), of which the specified minimum yield strength Re is less than 360 MPa,
shall comply with the requirements of Table 3. If the demand party requires
supply according to the higher precision of thickness (PT.B), it shall be indicated
in the contract. If not indicated, supply according to the general precision of
thickness (PT.A). According to the requirements of the demand party, the upper
and lower deviations of steel strips may be adjusted within the tolerances
specified in Table 3.
6.1.2.2 The thickness tolerance of steel strips (including plates/sheets cut from
strips), of which the specified minimum yield strength Re is not less than 360
MPa, shall comply with the requirements of Table 4. If the demand party
requires supply according to the higher precision of thickness (PT.B), it shall be
indicated in the contract. If not indicated, supply according to the general
precision of thickness (PT.A). According to the requirements of the demand
party, the upper and lower deviations of steel strips may be adjusted within the
tolerances specified in Table 4.
6.1.2.3 When the yield strength is not specified in the product standard and the
thickness tolerance is not specified, the thickness tolerance of steel strips
(including plates/sheets cut from strips) shall be agreed upon between the
supply and demand parties and indicated in the contract.
7.1.1.1.2 The flatness shall be determined by measuring the maximum distance
between the upper surface of the plate and the ruler. If the wave spacing (the
distance between the two contact points of the ruler and the plate) is not more
than 1000 mm, use a 1000 mm long ruler. For longer wave spacing, use a 2000
mm long ruler. For flatness with a height of no more than 2 mm, it shall not be
regarded as a wave.
7.1.1.2 Technical requirements
7.1.1.2.1 The flatness of plates shall comply with the requirements of Table 10.
If the demand party requires supply according to the higher precision of flatness
(PF.B), it shall be indicated in the contract. If not indicated, supply according to
the general precision of flatness (PF.A).
7.1.1.2.2 When the wave spacing (the distance between the two contact points
of the ruler and the plate) is between 300 mm and 1000 mm, the maximum
flatness of the plate shall also comply with the following requirements:
a) General precision of flatness (PF.A): the maximum flatness of steel type L
is 1.0 % of the wave spacing, and the maximum flatness of steel type H
is 1.5 % of the wave spacing, both of which shall not exceed those
specified in Table 10;
b) Higher precision of flatness (PF.B): the maximum flatness of steel type L
is 0.5 % of the wave spacing, and the maximum flatness of steel type H
is 1.0 % of the wave spacing, both of which shall not exceed those
specified in Table 10.
Table 10 -- Flatness of plates
Dimensions in millimeters
7.1.2 Plates/sheets cut from strips
Nominal
thickness
Flatness
Steel type L Steel type H
Measurement length
Agreed upon
Table 13 -- Height of tower shape
Dimensions in millimeters
8 Measurement of dimensions and shape
8.1 Length that is not assessed
When inspecting the thickness and width of mill-edge steel strips without cutting
the head and tail, the total length L of the two ends that is not assessed is
90/nominal thickness (L is in mm, the nominal thickness is in mm) and shall be
no more than 20 m.
8.2 Thickness
For cut-edge steel strips (including plates/sheets cut from strips), it is measured
at a distance of not less than 25 mm from the longitudinal side. For mill-edge
steel strips (including plates/sheets cut from strips), it is measured at a distance
of not less than 40 mm from the longitudinal side. For cut-edge plates, it is
measured at a distance of not less than 25 mm from the edge (longitudinal and
transverse sides). The measurement site of mill-edge plates is agreed upon
between the supply and demand parties.
8.3 Width
The width shall be measured at where perpendicular to the centerline of steel
plates/sheets or strips.
8.4 Length
The length of the largest rectangle in steel plates/sheets.
8.5 Flatness
8.5.1 Place the steel plate/sheet freely on a flat surface without applying any
pressure other than the weight of the steel plate/sheet itself.
8.5.2 Use a ruler with a length of 1000 mm or 2000 mm, in any direction within
a region of at least 25 mm from the longitudinal side and at least 200 mm or
100 mm from the lateral side of the plate, measure the maximum distance
between the upper surface of the plate and the ruler, see Figure 1.
Nominal width Cut-edge
Height of tower shape
Mill-edge
9.2 When steel plates/sheets are delivered according to theoretical weight, the
theoretical weight is calculated using nominal dimensions and the carbon steel
density of 7.85 kg/dm3. Other steel grades are weighted according to the
corresponding standards.
9.3 When the thickness tolerance of steel plates/sheets is limited to negative or
positive tolerance, the thickness used for the theoretical weight is the average
value of the maximum thickness and the minimum thickness allowed.
9.4 The theoretical weight of steel plates/sheets is calculated according to the
calculation method specified in Table 14.
Table 14 -- Calculation method for
theoretical weight of steel plates/sheets
Calculation sequence Calculation method Rounding off of results
Basic weight/kg/(mm • m2) 7.85 (weight of 1 mm thickness and 1 m2 area)
Unit weight/kg/m2 Basic weight [kg/(mm • m
2)] × thickness
(mm)
Rounded off to 4 significant
figures
Area of steel plate/sheet/m2 Width (m) × length (m) Rounded off to 4 significant figures
Weight of a steel
plate/sheet/kg Unit weight (kg/m
2) × area (m2)
Rounded off to 3 significant
figures; rounded off to integer
value of kg when it exceeds 1000
kg
Total weight/kg Sum of the weights of steel plates/sheets Integer value of kg
10 Rounding off of numerical values
The measurement results are rounded off according to the rounded off value
comparison method. Rules of rounding off are implemented in accordance with
the provisions of GB/T 8170.
......
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...
......
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