1. Steel pipe
A. seamless steel pipe: material 20#,45#,16Mn,Api 5L, ASTM 106A specification,dia57-630mm
B. high frequency weld tube: material Q235A/B, specification,dia15-159mm
C. galvanized pipe: material Q235A/B, specification, dia 15-80mm
D. stainless steel pipe: material 304, 316, 321, 430, specification, dia 15-159mm
E. cast iron pipe, material chilled cast iron, 18#, 22#, pig iron