... ST45.8GB5310-1995, ASTM A106-1999219-824mm, 24-78mmUsed in automobile industry,chemical industry,infrustructure & other related industriesFertilizer ... PipeQ195-Q345ASTM, GB0.8-12mm,19-275mmMainly used in petroluem,chemical,power,gas,water,shipbuiding,construction,etcLow & mid-pressure Boiler ... ,etcGB,ASTM,API5L2.1-110mm,10.3-508mmUsed in oil & gas fieldsWelded Steel Pipe10#,20#,45#,Q195,Q215,Q235, ...