... , GB0.8-12mm,19-275mmMainly used in petroluem,chemical,power,gas,water,shipbuiding,construction,etcLow & mid-pressure Boiler PipeCr5Mo, Cr9Mo, ... N80,etcGB,ASTM,API5L2.1-110mm,10.3-508mmUsed in oil & gas fieldsWelded Steel Pipe10#,20#,45#,Q195,Q215,Q235,Q345,etcGB ... ,ASTM20-426mm,0.5-10mmMainly used in petroluem,natrual gas and heating pipelineStainless Steel AngleSS400-SS540 SeriesASTM,JIS,GB,EN3 ...