GB/T 3639-2021 Translated English of Chinese Standard (GB/T3639-2021): Seamless cold-drawn or cold-rolled steel tubes for precision applicationsThis 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. |
Contents
Foreword | 3 |
Scope | 5 |
Terms and definitions | 7 |
Order content | 8 |
Technical requirements | 12 |
Inspection and test methods | 16 |
Inspection rules | 17 |
Packaging marking quality certificate | 18 |
Common terms and phrases
According Alloy structure annealing Appendix batch blue spectrophotometric method buyer cold-drawn or cold-rolled cold-rolled steel tubes contract controlled atmosphere curvature per meter delivered eddy current edition final cold flaring test following requirements heat treatment inner and outer Inspection item Jiangsu level shall meet Low-alloy steel magnetic flux leakage meet the following meet the requirements method after combustion millimeters minimum upper yield multiple length negotiation nominal inner diameter nominal outer diameter nominal wall thickness Non-destructive testing normative references order content photometric Piece by piece precision applications requirements of GB/T requirements of Table Sampling quantity seamless and welded Seamless cold-drawn specified in Table specimen per furnace spectrophotometric method GB/T steel and alloy Steel and iron Steel designation structural steels GB/T submerged arc-welded supplier Tensile strength test GB/T test methods testing of seamless tube shall meet tubes for precision ultrasonic testing uneven wall thickness upper yield strength welded except submerged