GB/T 3639-2021: Seamless cold-drawn or cold-rolled steel tubes for precision applications

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Scope

This document specifies the classification, code, order content, size, shape,
weight, tolerance, technical requirements, test methods, inspection rules,
packaging, markings, quality certificates of seamless cold-drawn or cold-rolled
steel tubes for precision applications.
This document is applicable to seamless cold-drawn or cold-rolled steel tubes
for precision applications (hereinafter referred to as steel tubes), which have
special dimensional accuracy and high surface quality requirements, for the
manufacture of mechanical structures, hydraulic equipment, automobile parts.

Basic Data

Standard ID	GB/T 3639-2021 (GB/T3639-2021)
Description (Translated English)	Seamless cold-drawn or cold-rolled steel tubes for precision applications
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H48
Word Count Estimation	14,168
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration