Square (Cold Formed) 方钢管  ( 冷轧 )  

Rectangular (Cold Formed) 矩型钢管( 冷轧 )

Circular (Cold Formed) 圆钢管( 冷轧 )

Square (Hot Finished) 方钢管( 热轧 )

Rectangular (Hot Finished) 矩型钢管( 热轧 )

Circular (Hot Finished) 圆钢管( 热轧 )