Standard No.: GB/T 3639-2021

Seamless Cold drawn or cold rolled precision seamless steel pipe.

Introduction to this standard:

This document specifies the classification, code, ordering content, dimension, shape, weight and allowable deviation of cold drawn or cold rolled precision seamless steel pipe, technical requirements, test methods, inspection rules, packaging, marks and quality certificates.

This document is applicable to the manufacture of cold drawn or cold rolled precision seamless steel pipes with special dimensional accuracy and high surface requirements for mechanical structures, hydraulic equipment and auto parts purpose.

English name: Seamless cold drawn or cold rolled steel tubes for precision application

Substitution: GB/T3639-2009

Classification: Metallurgical steel products.Special purpose steel pipe.

Release date: August 20, 2021.

Implementation date: March 1, 2022.

Proposed by: China Iron and Steel Industry Association.

Drafting Parties: Baoshan Iron and Steel Co., Ltd etc. Total 10 enterprises

press: China Standards Press.

Publication date: August 1, 2021.