Comment on Standards for Weld Steel Tubes for Low-pressure Fluid Transport Service

A comparison of the Chinese National Standard GB/T3091-2001《Weld Steel Tubes for Low-pressure Fluid Transport Service》with similar advanced international standards in terms of permissible dimensional deviation, chemical composition, mechanical property and technological performance is made, and the gaps and the causes therefore are identified. It is proposed that domestic makers of the said weld tubes need to get their products up to relevant international standards by means of improving product geometric accuracy, reducing P and S contents in the steel and adding bend test for the SAW tube, etc.