1. steel pipe production process:  steel pipe made of steel coiled coil as raw material, often heated and extruded, and welded by automatic double wire double-sided submerged arc welding process.

2.The characteristics of  steel pipe: straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development. The strength of the  welded pipe is generally higher than that of the straight welded pipe. It is possible to produce a welded pipe with a larger diameter by using a narrow blank, and it is also possible to produce a welded pipe of different diameter with a blank of the same width.Most of the smaller diameter welded pipes are straight seam welded, while the large diameter welded pipes are mostly welded

3.tube material: Q235A, Q23b, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb. Q345 L245 L290 X42 X46 X70 X80

Raw material (steel coil) → uncoiling →material accumulating → non-power leveling →mill-forming → high-frequency welding → removing burrs outside of weld seam →zinc→ cooling → sizing → roughly straightening → fixed length cutting → run-out table