METHOD FOR MANUFACTURE OF ROUND SECTION ROLLED PRODUCTS Russian patent published in 2002 - IPC

FIELD: ferrous metallurgy. SUBSTANCE: method involves providing manganese and silicon ladle deoxidation of metal with following blending blasting; providing ultimate aluminum deoxidation. Aluminum consumption is determined from expression: QskA1

= 0.307x[C] -3.021x[Si]+0.582x[Mn]-30.438x[N] +0.327, QkA1=-1.728x[C]-1.538x[Si]+1.746x[Mn]-0.713x[N]+0.792, where QskA1, QkA1 are amount of aluminum consumed for deoxidation of semikilled steel and killed steel, respectively, kg/t; [C],[Si], [Mn], [N] are content of carbon, silicon, manganese and nitrogen in metal after blending blasting, %; 0.307, 3.021, 0.582, 30.438, 0.327, 1.728, 1.538, 1.746, 0.713, 0.792, are empirical coefficients obtained by experimentation; pouring metal in graded ingot molds; producing rolled products of 5.5-20 mm diameter; intensified cooling of rolled products with water till obtaining required average weight temperature of rolled product determined from expression: T= 10.74xDrp+82.86x[Si]+717.21, where T is average weight temperature of rolled product, C; Drp is diameter of rolled product, mm; Si is content of silicon in metal after pouring in graded ingot molds; 10.74, 82.86, 717.21 are empirical coefficients obtained by experimentation; providing air cooling of formed coils of rolled products. EFFECT: increased quality of rolled products by reduced surface defects and nonmetallic inclusions, and increased yield. 2 tbl, 1 ex