... seamless pipeHebei shengtian (group) seamless steel pipe Co,. LtdWe manufacture spiral steel pipe with good quality as per API5L,GB,JIS,DIN ASTM, BS standard ... ,X52,X56,X60,X65,X70, etc11.Usagefor petroleum/ natural gas pipeline , for conveying water,drainage,coal gas, mineral slurry and other ...