SSAW PIPE Spiral steel pipe, Size:OD:219mm-3420mm;WT:6mm-30mm Standard: ... DIN 17100,JIS G3101,and so on Ningbo zhehua heavy steel pipe manufacturing Co.,ltd ,a subsidiary of SUTOR Technology ... manufacturing large-diameter,double-side,submerged-arc weldeed steel pipes and spiral seam steel pipes,with diameters from 219mm to 3420mm and ... company's product.We are mainly produce the carbon steel welded pipe.