Seamless steel pipe (SMLS) is a tubular section or hollow cylinder, usually but not necessarily of circular cross-section formed by drawing a solid billet over a piercing rod to create the hollow shell without a seam or a weld-joint, used mainly to convey substances which can flow — liquids and gases (fluids), slurries, powders and masses of small solids. Seamless steel pipe can be cut, threaded or grooved. And the coating method includes black, red lacquer, varnish painting, hot dip galvanization, etc.
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