GB/T 706-2016 (GB/T706-2016, GBT 706-2016, GBT706-2016) & related versions
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GB/T 706-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.70
H 44
Replacing GB/T 706-2008
Hot rolled section steel
ISSUED ON. DECEMBER 30, 2016
IMPLEMENTED ON. SEPTEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Order contents ... 6
4 Dimension, shape, weight and allowable deviation ... 6
5 Technical requirements ... 12
6 Test methods ... 13
7 Inspection rules ... 13
8 Packaging, marking and quality certificate ... 13
Annex A (normative) Cross-sectional dimension, cross-sectional area,
theoretical weight and cross-section characteristics of section steels ... 14
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 706-2008 “Hot rolled section steel”. Compared with GB/T
706-2008, main technical changes of this Standard are as follows.
- DELETE relevant contents of hot rolled L-shape section steels (see Table 3, Table
5 and Table A.5 of 2008 edition);
- ADD order contents (see Clause 3);
- ADJUST parts of dimension, shape and allowable deviation (see Table 1 and Table
2 of this Standard, Table 1 and Table 2 of 2008 edition);
- ADJUST the requirements for the allowable deviation of weight (see 4.4 of this
Standard, 3.4 of 2008 edition);
- ADD the representing method for specification (see 4.5);
- ADJUST parameters of cross-sectional area, theoretical weight and cross-section
characteristics (see Table A.1, Table A.2, Table A.3 and Table A.4).
This Standard is proposed by China Iron and Steel Industry Association.
This Standard is under the jurisdiction of National Technical Committee on Steel of
Standardization Administration of China (SCA/TC 183).
Drafting organizations of this Standard. Magang (Group) Holdings Co., Ltd., Hebei
Jinxi Iron and Steel Group Co., Ltd., Hebei Iron and Steel Group Tangshan Branch,
Shandong Iron and Steel Group Lai Steel Branch, Anshan Baode Iron and Steel Co.,
Ltd., Rizhao Iron and Steel Holding Group Co., Ltd., Changshu Longteng Special Steel
Co., Ltd., China Metallurgical Information and Standardization Institute.
Main drafters of this Standard. Gong Qinghua, Zhao Haiyan, Zhao Yichen, Deng
Cuiqing, Wang Zhongxue, Wang Hongxin, Wang Fuliang, Zhao Xun, Liu Baoshi, Wu
Baoqiao, Chen Chunsheng, Zhao Xinhua, Wei Zhenzhou, Wang Changhua, Xi Tie,
Wang Yujie, Zhang Weibin and Zhang Buhai.
The previous version of the standard replaced by this Standard are as follows.
- GB/T 706-1965, GB/T 706-1988, GB/T 706-2008;
- GB/T 707-1965, GB/T 707-1988;
- GB/T 9787-1988;
Hot rolled section steel
1 Scope
This Standard specifies the order contents, dimension, shape, weight and allowable
deviation, technical requirements, test methods, inspection rules, packaging, marking
and quality certificate of hot rolled I-beam steels, hot rolled channel steels, hot rolled
equal angle steels and hot rolled unequal angle steels.
This Standard applies to hot rolled equal angle steels, hot rolled unequal angle steels
and hot rolled I-beam steels and hot rolled channel steels with a slope on the inside of
the leg (hereinafter referred to as section steels).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the dated edition cited applies. For undated
references, the latest edition of the referenced document (including all amendments)
applies.
GB/T 228.1 Metallic materials - Tensile testing - Part 1. Method of test at room
temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 232 Metallic materials - Bend test
GB/T 700 Carbon structural steels
GB/T 1591 High strength low alloy structural steels
GB/T 2101 General requirement of acceptance, packaging, marking, and
certification for section steel
GB/T 2975 Steel and steel products - Location and preparation of test pieces for
mechanical testing
YB/T 4427 General requirements for surface condition of hot-rolled sections
3 Order contents
The contract ordered in accordance with this Standard shall contain the following
technical contents.
a) product name;
b) standard number;
c) grade;
d) model, specification;
e) delivery length;
f) weight and quantity;
g) other special requirements of the demand party.
4 Dimension, shape, weight and allowable deviation
4.1 Dimension and representing method
4.1.1 Schematic diagrams and marked symbols of cross-section of section steels are
as shown in Figure 1 to Figure 4.
4.1.2 Parameters of cross-sectional dimension, cross-sectional area, theoretical
weight and cross-section characteristics of section steels shall comply with the
specifications of Tables A.1 to A.4 of Annex A.
4.2 Dimension, shape and allowable deviation
4.2.1 Dimension, shape and allowable deviation of section steels shall comply with the
specifications of Table 1 to Table 2. According to the requirements of the demand party,
dimension, shape and allowable deviation of section steels can also be specified in
accordance with the agreement between supply and demand parties.
Unequal angle steels. “∠” and long side width × short side width × edge thickness;
e.g.. ∠160 × 100 × 16.
5 Technical requirements
5.1 Grades and chemical composition
Steel grades and chemical composition (smelting analysis) shall comply with the
relevant specifications of GB/T 700 or GB/T 1591. According to the requirements of
the demand party, through the agreement between the supply and demand parties,
steels of other grades and chemical composition can also be supplied.
5.2 Mechanical properties
Mechanical properties of section steels shall comply with the relevant specifications of
GB/T 700 or GB/T 1591. According to the requirements of the demand party, through
the agreement between the supply and demand parties, steels of other mechanical
property indicators can also be supplied.
5.3 Delivery status
The steel is delivered in hot rolled state.
5.4 Surface quality
5.4.1 Surface of section steels shall not have cracks, folding, scarring, stratification
and inclusions.
5.4.2 Surface of section steels allows existence of defects such as local hairlines, pits,
dots, scratches and iron oxide presses, but these defects shall not exceed the
allowable deviation of dimension of section steels.
5.4.3 Defects on the surface of section steels are allowed to be cleared, which shall
be smooth without edges, but horizontal clearance is not allowed. The clearance width
shall not be less than five times the clearance depth; after clearance, the dimension of
section steels shall not exceed the allowable deviation of dimension.
5.4.4 Ends of section steels shall not have burrs greater than 5 mm.
5.4.5 According to the agreement between supply and demand parties, the surface
quality can also be implemented in accordance with the specifications of YB/T 4427.
......
GB/T 706-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.70
H 44
Replacing GB/T 706-1988, GB/T 707-1988,
GB/T 9787-1988, GB/T 9788-1988, GB/T 9946-1988
Hot Rolled Section Steel
ISSUED ON. AUGUST 19, 2008
IMPLEMENTED ON. APRIL 1, 2009
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Dimensions, shape, weight and tolerances ... 6
4 Technical requirements ... 11
5 Testing method ... 12
6 Inspection rules ... 12
7 Packaging, marking and quality certificate ... 13
Appendix A ... 14
Foreword
This Standard integrates and revises GB/T 706-1988 “Hot-rolled Beam Steel
- Dimensions, Shape, Weight and Tolerances”, GB/T 707-1988 “Hot-rolled
Channel Steel - Dimensions, Shape, Weight and Tolerances”, GB/T
9787-1988 “Hot-rolled Equal-leg Angle Steel - Dimensions, Shape, Weight
and Tolerances”, and GB/T 9788-1988 “Hot-rolled Unequal-leg Angle Steel -
Dimensions, Shape, Weight and Tolerances” and GB/T 9946-1988 “Hot-rolled
L-sectional Steel - Dimensions, Shape, Weight and Tolerances”.
This Standard replaces GB/T 706-1988 “Hot-rolled Beam Steel - Dimensions,
Shape, Weight and Tolerances”, GB/T 707-1988 “Hot-rolled Channel Steel -
Dimensions, Shape, Weight and Tolerances”, GB/T 9787-1988 “Hot-rolled
Equal-leg Angle Steel - Dimensions, Shape, Weight and Tolerances”, and
GB/T 9788-1988 “Hot-rolled Unequal-leg angle - Dimensions, Shape, Weight
and Tolerances” and GB/T 9946-1988 “Hot-rolled L-sectional Steel -
Dimensions, Shape, Weight and Tolerances”.
Compared with GB/T 706-1988, GB/T 707-1988, GB/T 9787-1988, GB/T
9788-1988 and GB/T 9946-1988, the main changes of this Standard are as
follows.
- Normative references are added;
- Additional specifications are involved;
- Tolerances for some of the dimensions, shapes are adjusted;
- Technical requirements, and requirements for testing methods,
inspection rules, packaging, marking, quality certificate are added;
- Appendix A is added.
Appendix A of this Standard is normative.
This Standard was proposed by China Steel and Iron Association.
This Standard shall be under the jurisdiction of National Steel and Iron
Standardization Committee.
Drafting organizations of this Standard. Maanshan Iron and Steel Co., Ltd.,
Metallurgical Industry Information and Standard Research Institute, Tangshan
Iron and Steel Co., Ltd., Laiwu Iron and Steel Co., Ltd., Anshan Baode Iron
and Steel Co., Ltd. AND Capital Steel Hongye Iron and Steel Co.
The main drafters of this Standard. Gong Qinghua, Feng Chao, Wang Lijuan,
Deng Cuiqing, Du Chuanzhi, Wang Hongxin, Li Guang, Xi Tie, Wu Jiecai, Sun
Hot-rolled section steel
1 Scope
This Standard specifies the dimensions, shape, weight, tolerances, technical
requirements, requirements for testing methods, inspection rules, packaging,
marking and quality certificate for hot-rolled beam steel, hot-rolled channel
steel, hot-rolled equal-leg angle steel, hot-rolled unequal-leg angle steel and
hot-rolled L-sectional steel.
This Standard is applicable to hot-rolled equal-leg angle steel, hot-rolled
unequal-leg angle steel, hot-rolled L-sectional steel, hot-rolled channel steel
and beam steel of which the inner side of the flange has an inclination
(hereafter abbreviated as section steel).
2 Normative references
The following normative documents contain the provisions which, through
reference in this text, constitute the provisions of this Standard. For dated
references, the subsequent amendments (excluding corrections) or revisions
of these publications do not apply. However, the parties who enter into
agreements based on this Standard are encouraged to investigate the
possibility of applying the most recent editions of the normative documents
indicated below. For undated references, the latest edition of the normative
document applies.
GB/T 228 Metallic Materials - Method for Tensile Testing at Ambient
Temperature (GB/T 228-2002, eqv ISO 6892.1998 (E))
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method (GB/T
229-2007, ISO 148-1.2006, MOD)
GB/T 232 Metallic Materials - Bending Test Method (GB/T 232-1999, eqv
ISO 7438.1985 (E))
GB/T 700 Carbon Structural Steel
GB/T 1591 High Strength Low Alloy Structural Steel
GB/T 2101 General Requirements of Acceptance, Packaging, Marking and
Certification for Section Steel
GB/T 2975 Steel and steel products - Location and preparation of test
pieces for mechanical testing (GB/T 2975-2008, eqv ISO 377.1997)
3 Dimensions, shape, weight and tolerances
3.1 Dimensions and expression method
3.1.1 The sectional drawings of section steel and their marking symbols are
shown in Figure 1 ~ Figure 5.
3.1.2 The sectional dimensions, area, theoretical weight as well as sectional
properties shall comply with the requirements in Figure A.1 ~ Figure A.5 in
Appendix A.
3.2 Dimensions, shape and tolerances
3.2.1 The dimensions, shape and tolerances for section steel shall comply
with the requirements in Figure 1 ~ Figure 3. Depending on the requirements
from the demanding party, the dimensions, shape and tolerances for section
steel are subject to agreement by both supplying and demanding parties.
3.2.2 The flange end of the beam steel shall be made obtuse; the flange end,
shoulder end of channel steel shall be made obtuse so that a round bar
whose diameter is 0.18t shall not be able to pass through the roll grooves.
The leg end and corner of angle steel shall be made obtuse so that a round
bar whose diameter is 0.18t shall not be able to pass through the roll grooves.
3.2.3 The flange slope, web deflection of beam steel and channel steel, the
right angle at the corner of angle steel shall be inspected at the place not less
than 750 mm from the end.
3.2.4 The tolerance of average flange thickness for beam steel and channel
steel shall be ± 0.06t, and shall be inspected on the roll after it is being turned.
3.2.5 Subject to agreement by both parties, the degree of asymmetry for the
flange relative to the vertical axis of beam steel shall not exceed half of the
tolerance of the same flange.
3.2.6 The section steel shall be free of noticeable distortion.
3.3 Length and tolerances
3.3.1 The usual length of angle steel is 4000 mm ~ 19000 mm, while that of
other steel sections is 5000 ~ 19000mm. Depending on the requirement from
the demanding party, products of other lengths can also be provided.
3.3.2 The tolerances for cut lengths shall be in accordance with the provisions
in the Table 4.
lamination and inclusions.
4.4.2 The hairline, depressions, mechanical pitting, scratches and rolled-in
scale are locally allowed on the section steel surface, but shall not exceed the
dimensional tolerance for the section steel.
4.4.3 The defects on the surface of section steel are allowed to be removed;
the place after removal shall be smooth and free of sharp edges. But the
removal in the traverse direction shall not be carried out. The removed width
shall not be less than five times of the removed depth. The dimension of the
section steel due to removal shall not exceed the dimensional tolerance.
4.4.4 The section steel shall be free of burrs of more than 5 mm.
5 Testing method
5.1 The inspection items, sample quantity and testing method for each steel
batch shall be in accordance with the requirements in the Table 6.
Table 6 Inspection items, sample size and testing method
No. Inspection items Sample quantity (pcs)
Sampling
method Testing method
1 Chemical ingredient See the provisions of the standards for the corresponding designations.
2 Tensile strength 1
GB/T 2975
GB/T 228
3 Bending strength 1 GB/T 232
4 Impact strength at ambient T 3 GB/T 229
5 Impact strength at low T 3
6 Surface quality Piece by piece — Visually or by measuring tool
7 Dimensions, shape Piece by piece — By measuring tool
5.2 For beam steel and channel steel, the sample shall be taken from its web.
6 Inspection rules
6.1 The inspection and acceptance shall be carried out by the technical
quality supervision department from the supplier.
6.2 Group-batching of section steel shall be carried out in accordance with
GB/T 700, GB/T 1591 and other corresponding standards.
6.3 Re-inspection and acceptance rules of section steel shall be in
accordance with the provisions of GB/T 2101.
7 Packaging, marking and quality certificate
The packaging, marking and quality certificate for section steel shall be in
accordance with the provisions of GB/T 2101.
......
| Standard ID | GB/T 706-2016 (GB/T706-2016) | | Description (Translated English) | Hot rolled section steel | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H44 | | Classification of International Standard | 77.140.70 | | Word Count Estimation | 22,284 | | Date of Issue | 2016-12-30 | | Date of Implementation | 2017-09-01 | | Older Standard (superseded by this standard) | GB/T 706-2008 | | Drafting Organization | Maanshan Iron and Steel Group Co., Ltd., Hebei Jinxi Iron and Steel Group Co., Ltd., Hebei Iron and Steel Group Tang Steel Branch, Shandong Iron and Steel Group Lai Steel Branch, Anshan Baode Iron and Steel Co., Ltd., Rizhao Iron and Steel Holding Group Co., Special Steel Co., Ltd., Metallurgical Industry Information Standards Institute | | Administrative Organization | National Steel Standardization Technical Committee (SCA/TC 183) | | Regulation (derived from) | National Standard Notice No.27 of 2016 | | Proposing organization | China Iron and Steel Industry Association | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee | | Standard ID | GB/T 706-2008 (GB/T706-2008) | | Description (Translated English) | [Newer version GB/T 706-2016] Hot rolled section steel | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H44 | | Classification of International Standard | 77.140.70 | | Word Count Estimation | 21,214 | | Date of Issue | 2008-08-19 | | Date of Implementation | 2009-04-01 | | Older Standard (superseded by this standard) | GB/T 706-1988; GB/T 707-1988; GB/T 9787-1988; GB/T 9788-1988; GB/T 9946-1988 | | Quoted Standard | GB/T 228; GB/T 229; GB/T 232; GB/T 700; GB/T 1591; GB/T 2101; GB/T 2975 | | Drafting Organization | Maanshan Iron & Steel Co., Ltd. | | Administrative Organization | National Steel Standardization Technical Committee | | Regulation (derived from) | National Standard Approval Announcement 2008 No.14 (Total No.127) | | 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 hot rolled I-beam, hot rolled channel, Hot rolled edge angle, Hot-rolled and hot-rolled unequal angle steel of size L, shape, weight and tolerance, technical requirements, test methods, inspection rules, packaging, marking and quality certification. This standard applies to hot-rolled edge angle, Hot-rolled unequal angle, inside L of hot-rolled steel and tapered legs rolled steel and hot rolled channel Goyoo (hereinafter referred to as steel). | | Standard ID | GB/T 706-1988 (GB/T706-1988) | | Description (Translated English) | [Newer version GB/T 706-2016] Hot-rolled beam steel--Dimensions, shape, weight and tolerances | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H44 | | Classification of International Standard | 77.140.70 | | Word Count Estimation | 11,141 | | Date of Issue | 1988/9/5 | | Date of Implementation | 1989/7/1 | | Older Standard (superseded by this standard) | GB 706-1965 | | Adopted Standard | �������� 8239-1972, NEQ | | Regulation (derived from) | Announcement of Newly Approved National Standards 2008 No. 14 (No. 127 overall) | | Issuing agency(ies) | State Bureau of Technical Supervision |
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