1)Specification: from 50*50 to 400*400 

2)Thickness:2-12mm

3)Length:6-16 m

4)Trademark:Q235,Q345,Q195, ASTM500A, ASTM500B, ASTM500C ,Mn16

5)Form of welding line: straight sew

6)Production techniques: resistance welding

7)Port of tube: without screw thread