carbon steel pipe 1.certificate :ISO9001/14001 2.standard :ASTM A554 3.mterials :201,202,304,316 4.size:12.7mm-219mm carbon steel pipe1)Material ... ,25X25MM,30X30MM,38X38MM,50X50MM,60X60MM,80X80MM,100X100MM,150X150MM3,rectabgular pipe :20x10mm,20x40mm,25x13mm,25x50mm, 30x10mm,30x15mm,30x60mm,45x75mm,45x95mm,50x100mm,150x100mm carbon steel pipe