Low Steel Grade Pipeline Clean Steel and Smelting Method

摘要

The present invention discloses low steel grade pipeline clean steel, and relates to the field of metallurgical technology, the chemical composition and mass percentage of which are C: 0.04% to 0.07%, Si: 0.10% to 0.35%, Mn: 1.00% to 1.50%, P≤0.015%, S:0.0020%~0.0050%, Nb:0.030%~0.070%, Ti:0.006%~0.020%, Ni≤0.30%, Cr≤0.30%, Cu≤0.30%, Al:0.015 %~0.050%, the remainder is Fe and impurities. The present invention systematically and accurately analyzes the formation control mechanism of inclusions, carries out the calcium treatment method after RH vacuum treatment through rational component design, and achieves the purpose of improving the purity of molten iron by rationally controlling the degree of superheat, thereby achieving the internal quality of steel and improve the economic effect.