... .2mm---50mm SPOTS GOODS AT PRESENT: 2864.57 Welded Square Steel Tubes 1. Grade: 12Cr1Mov, 12CrMo,15CrMo, 13CrMo44,Cr5Mo,25CrMo, 30CrMo, ... 88 ASTM A335/A335M ASTM A213/A213M3. Usage: Applied to petroleum, chemical industry, and electric power, to resist high or low ... used in the long-distance transmitting pipelines of natural gas, petroleum, chemical industry, power, heat power and water source etc. ...