GB/T 246-2017: Metallic materials -- Tube -- Flattening test

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Scope

This standard specifies the flattening test method for determining the plastic deformability of a round cross-section metal tube and can also be used to reveal its defects.
Except for the relevant product standards, this standard applies to metal pipes whose outer diameter does not exceed 600mm and whose wall thickness does not exceed 15% of the outer diameter.
2 symbols, names and units
The symbols, names, and units used in this standard are shown in Table 1 and Figure 1.
Table 1 Symbols, Names, and Units
Symbol name unit
Aa Wall thickness mm
b Internal width of the specimen after crushing mm
D Metal tube outer diameter mm
The distance between the two pressure plates under H force mm
L sample length mm
a The steel pipe standard also uses other symbols to indicate this parameter.

Basic Data

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	4,477
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Older Standard (superseded by this standard)	GB/T 246-2007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
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
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.