Seamless steel pipe is the name, generally used to distinguish the welded pipe (with seam pipe). 20#, a steel grade, also called steel grade, is a chemical composition. In general, 20# steel has the following chemical composition: Carbon (C) Silicon (Si) Manganese (Mn) Phosphorus (P) Sulfur (S) 0.17-0.24 0.17-0.37 0.35-0.65 0.35max 0.35max Different seamless steel pipe standards The requirements for chemical composition are slightly different. Some standards also require chromium (Cr) molybdenum (Mo) 矾 (V) nickel (Ni) ...
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