Spiral steel pipe is a spiral seam steel pipe welded by automatic double-wire double-sided submerged arc welding process.
Straight seam steel pipe is a steel pipe whose weld is parallel to the longitudinal direction of the steel pipe, mainly including submerged arc welded straight seam steel pipe and high frequency welded steel pipe. Customizable.
LSAW steel pipe is a single plate as raw material, the steel plate in the mold or forming machine pressure (roll) into tube blank.