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GB/T 25048-2019Metallic materials - Tube - Ring tensile test (English PDF)

金属材料管环拉伸试验方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 30, 2019

Implementation date

July 1, 2020

Scope

GB/T 25048-2019 is the English-translated version of 金属材料管环拉伸试验方法.

GB/T 25048-2019 specifies the ring tensile test on metallic tube. A ring cut from one end of the tube is stretched until it fractures, exposing the surface and internal defects of the sample; the test can also assess the ductility of the tube.

The ring is made to bear circumferential deformation using two cylindrical pins of the same diameter, parallel, relatively movable and parallel throughout the movement; where the inside diameter allows it, the pin diameter is at least three times the wall thickness of the ring.

It applies to metallic tube of outside diameter over 150 mm, wall thickness not more than 40 mm and inside diameter over 100 mm, and covers the sample, procedure and test report.

Identical with ISO 8496:2013, it replaces GB/T 25048-2010, was issued on 30 August 2019 and has applied since 1 July 2020.

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Document preview — GB/T 25048-2019

National Standard of the People's Republic of China

Issued by: SAMR; SAC

Foreword3
1 Scope4
2 Principle4
3 Test equipment4
4 Sample5
5 Test procedure5
6 Test report5

1 Scope

This Standard specifies the metallic tube ring tensile test methods that stretch the sample until it breaks to expose the surface and internal defects of the sample. This Standard can also be used to evaluate the ductility of metallic tube.

This Standard is applicable to the metallic tube, of which the outer diameter is more than 150 mm, the wall thickness is not more than 40 mm and the inner diameter is more than 100 mm.

2 Principle

Cut a section of tube ring sample from one end of the metallic tube; let the metallic tube ring sample bear the circumferential deformation until fracture occurs.

3 Test equipment

Use 2 cylindrical pins of the same diameter; their axes are parallel, and relatively movable; remain parallel during the movement.

In principle, the diameter of the cylindrical pin shall be the minimum value of the allowable strength. The diameter of the cylindrical pin shall be at least 3 times the wall thickness of the tube ring, if the inner diameter of the metallic tube ring is allowed (as shown in Figure 1). […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

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