20# seamless steel pipe material for the 20# metal, the intensity is slightly larger than the 15#, not often quenching, no mood brittleness. Tinning is carried out by a continuous electrolytic process after degreasing and pickling operations which remove, respectively, the greasy residue of rolling, and the oxide movie protecting the steel strip. 2. As a result of the zinc … Continue reading SSAW Steel Pipe, Spiral Welded Pipe, Welded Metal Pipe