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GB/T 246-2017

Chinese Standard: 'GB/T 246-2017'
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Standard ID GB/T 246-2017 (GB/T246-2017)
Description (Translated English) Metallic materials. Tube. Flattening test
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H23
Classification of International Standard 77.040.10
Word Count Estimation 4,411
Date of Issue 2017-07-12
Date of Implementation 2018-04-01
Older Standard (superseded by this standard) GB/T 246-2007
Adopted Standard ISO 8492-2013, IDT
Drafting Organization Changshu Entry-Exit Inspection and Quarantine Bureau of the People Republic of China, Zhejiang Jinzhou Pipeline Technology Co., Ltd., National Steel and Products Quality Supervision and Inspection Center, Metallurgical Industry Information Standards Institute
Administrative Organization National Steel Standardization Technical Committee (SAC / TC 183)
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
Summary This standard specifies a flattening test method for determining the plastic deformation capacity of circular cross-section metal pipes and may also be used to reveal defects. In addition to the relevant product standards, this standard applies to the diameter of not more than 600 mm and wall thickness of not more than 15% of the metal tube.

GB/T 246-2017
ICS 77.040.10
H 23
GB/T 246-2017/ISO 8492.2013
Replacing GB/T 246-2007
Metallic Materials – Tube – Flattening
Test (ISO 8492.2013, IDT)
ISSUED ON. JULY 12, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Symbols, Names and Units ... 4
3 Test Principle ... 4
4 Test Equipment ... 5
5 Specimen ... 5
6 Test Procedures ... 5
7 Test Report ... 6
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 246-2007 Metal Materials – Tube – Flattening Test;
compared with GB/T 246-2007, the major technical changes are as follows.
--- Modify the standard name into “Metallic Materials – Tube – Flattening Test”;
--- Modify the description of “Range” (see Clause 1);
--- Add titles to Table 1 and Figure 1; modify the note of wall thickness symbol in
Table 1 (see Table 1, Figure 1);
--- Modify the description of “Test Principle” (see Clause 3)
--- Make editorial change for “Test Procedures” (see Clause 6);
--- Replace Clause 7 Item d) “pressure plate spacing” with “distance between two
pressure plates under force (H)”.
The translation method used in this Standard equivalently adopts ISO 8492.2013
Metallic Materials – Tube – Flattening Test.
This Standard makes the following editorial changes.
--- Add titles to Table 1 and Figure 1.
This Standard was proposed by China Iron and Steel Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Steel (SAC/TC 183).
Drafting organizations of this Standard. Changshu Entry-Exit Inspection and
Quarantine Bureau of the People’s Republic of China, Zhejiang Kingland Pipeline and
Technologies Co., Ltd., National Center for Quality Supervision & Test of Steel Material
Products, and China Metallurgical Information and Standardization Institute.
Chief drafting staffs of this Standard. Wang Weizhong, Lu Shuyuan, Yang Weifang, Liu
Yan, Dong Li, Yu Lu, Xu Haibin, and Huang Fei.
The historical editions replaced by this Standard are as follows.
--- GB 246-1963, GB 246-1982, GB/T 246-1997, GB/T 246-2007.
Metallic Materials – Tube – Flattening Test
1 Scope
This Standard specifies the flattening test method for determining the plastic
deformability of metal tube with circular cross-section, it can also be used for revealing
the tube defects.
Except for the provisions of relevant product standards, this Standard is applicable to
the metal tubes with outer diameter no greater than 600mm, and wall thickness no
greater than 15% outer diameter.
2 Symbols, Names and Units
The symbols, names and units used in this Standard can refer to Table 1 and Figure
Table 1 -- Symbols, Names and Units
Symbols Names Units
a a Wall thickness of tube mm
b Inner width of specimen after flattening mm
D Outer diameter of metal tube mm
H Distance between two pressure plates under force mm
L Specimen length
a such parameter can also be expressed by other symbols in the steel tube standards.
3 Test Principle
The Force IS APPLIED TO the specified-length metal tube specimen cut from the
direction perpendicular to the longitudinal axis of the metal tube OR specimen on meta......
Related standard:   GBZ 246-2013  GB/T 244-2020
Related PDF sample:   GB/T 232-2010
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