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GB/T 706-2008 (GBT706-2008)

GB/T 706-2008_English: PDF (GBT 706-2008, GBT706-2008)
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BASIC DATA
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Older Standard (superseded by this standard) GB/T 706-1988; GB/T 707-1988; GB/T 9787-1988; GB/T 9788-1988; GB/T 9946-1988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).

Newer version: GB/T 706-2016
Standards related to: GB/T 706-2008

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.
...