20# seamless steel pipe for low carbon steel pipe, carbon steel is generally divided into low carbon steel, medium carbon steel and high carbon steel three kinds of steel, including 45# steel for medium carbon steel, lower than 45# that is, low carbon steel, higher than 45# that is, high carbon steel, seamless steel pipe, such as there is no special requirements, are used 20# seamless steel pipe.
●Chemical composition:
Carbon C ：0.17～0.24 "Si：0.17～0.37Mn Mn：0.35～0.65Sulfur S ：≤0.035Phosphorus P ：≤0.035Chromium Cr ：≤0.25Nickel Ni ：≤0.25Copper Cu：≤0.25
●Mechanical properties：
Tensile Strength σb (MPa): ≥410 (42) yield strength σs (MPa): ≥245 (25) elongation δ5 (%): ≥25 sectional shrinkage ψ (%): ≥5, hardness: not heat-treated, ≤156HB, specimen size: specimen size of 25mm
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