The quality of carbon steel is distinguished by the amount of sulfur (s) and phosphorus (P) in the steel. When the ASTM A514 QT steel plate sulfur content in carbon steel is not more than 0.050% and the phosphorus content is not more than 0.045%, it is ordinary carbon steel; when the sulfur content and phosphorus content in carbon steel are less than 0.040%, it is high-quality carbon steel; when the ASTM A514 QT steel plate sulfur content in carbon steel is less than 0.030% and the phosphorus content is less than 0.035%, it is high-quality carbon steel.
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The tensile strength of seamless steel pipe is more than 8-10 times of that of ordinary steel, and its elastic modulus is better than that of steel, with excellent creep resistance, corrosion resistance and seismic resistance; the mechanical performance of seamless steel pipe is excellent, easy to machine, etc.; the seamless steel pipe ASTM A514 QT steel plate is highly elastic, reused in mechanical equipment, memoryless, deformation free, and antistatic.
