What is the difference between high frequency welded pipe and seamless steel pipe
High-frequency welded pipes are generally completed through processes such as cold rolling, high-frequency welding, and forming. It is a kind of seamed tube. High-frequency welded pipes are generally thin-walled pipes, and the materials are generally divided into stainless steel, carbon steel, galvanized steel pipe, etc.
Longitudinal welded pipe has simple production process, high production efficiency, low cost and rapid development. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. A narrower blank can be used to produce welded pipes with larger pipe diameters, and a billet with the same width can also be used to produce welded pipes with different pipe diameters. But compared with the straight seam pipe of the same length, the weld length is increased by 30-100%, and the production speed is lower.
Therefore, most of the smaller diameter welded pipes adopt straight seam welding, and the large diameter welded pipes mostly adopt spiral welding.
Seamless steel pipes are divided into hot-rolled seamless pipes and cold-drawn seamless pipes. Hot-rolled pipes are forged, pierced, rolled, and shaped. Generally, large-diameter and thick-walled seamless pipes adopt this form; cold-drawn pipes are formed by cold-drawn pipe blanks, the material strength is relatively low, and the exterior and internal control surfaces are smooth. Small-caliber, thin-walled seamless pipes are mostly of this kind. Seamless steel pipe materials include ordinary and high-quality carbon structural steel (Q215-A～Q275-A and 10～50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless and acid-resistant steel, etc.
