GB/T 31925-2015: Ultrasonic Test Methods of Heavy Wall Thickness Seamless Steel Pipes and Tubes

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Scope

This Standard specifies the piezoelectric ultrasonic test principles, test methods,
comparison specimen, flaw-detection equipment, test procedure, result assessment,
test report of seamless stainless steel pipe with the ratio of wall-thickness to outside
diameter in the range of 0.2~0.3.
This Standard is applicable to ultrasonic test of longitudinal and horizontal defects on
heavy wall seamless steel pipe for all kinds of uses, with the outside diameter no less
than 6mm. This Standard’s flaw-detection method is mainly against the test of metallic
discontinuities defects within the steel pipe, which is not applicable to the test of
laminar defects.
For the test of pipe with ratio of wall-thickness to outside diameter equals and is
greater than 0.3, it shall be carried out through the coordination between the buyer
and the seller.

Basic Data

Standard ID	GB/T 31925-2015 (GB/T31925-2015)
Description (Translated English)	Ultrasonic Test Methods of Heavy Wall Thickness Seamless Steel Pipes and Tubes
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H26
Classification of International Standard	77.040.20
Word Count Estimation	8,894
Date of Issue	2015-09-11
Date of Implementation	2016-06-01
Quoted Standard	GB/T 5777-2008; GB/T 9445; YB/T 4082; JB/T 10061
Regulation (derived from)	National Standard Announcement 2015 No.25
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 the principle of seamless steel pipe wall thickness of the piezoelectric ultrasonic examination diameter ratio greater than 0.2 and less than 0.3, the test method, the comparative sample, testing equipment, testing conditions, test step, evaluation of results, inspection reports. This Standard applies to all kinds of purposes, an outer diameter of not less than 6 mm thick-walled seamless steel pipe longitudinal, transverse ultrasonic test defects. This Standard is the main flaw detection method for detecting discontinuities in the metal pipe defects, does not apply to the detection of laminar imperfections.