Carbon Steel Pipe with High Quality 1.WT:4-70mm OD:25-370mm 2.Certification ... 79JISG3467-88JISG3458-88 GB5310-95 GB9948-88ASTMA335/A335mASTMA213/A213mhigh-temperature resistant,Low temperature-resistant, corrosion-resistant Seamless pipe for Petroleum, chemical, ... exchanger tube- Pipeline seamless pipe10-530×1.5-36 high-pressure seamless pipe for chemical fertilizer equipment 20,16Mn,Q345GB6479- ...