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A PROCESS FOR MANUFACTURING OF X-70 LINEPIPE STEEL VIA THIN SLAB CASTING AND DIRECT ROLLING ROUTE
A PROCESS FOR MANUFACTURING OF X-70 LINEPIPE STEEL VIA THIN SLAB CASTING AND DIRECT ROLLING ROUTE
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机译：通过薄板坯铸件和直接轧制线制造X-70管线钢的过程
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摘要
A process for manufacturing a thin steel product via TSCR route by providing a molten steel containing following elements (in weight %): C = 0.052 - 0.058, Mn = 1.49 - 1.70, S = 0.005 - 0.007, P = 0.010 - 0.012, Si = 0.35 - 0.40, Al = 0.018 - 0.049, Ti = 0.000 - 0.019, V = 0.021 - 0.034, Nb = 0.046 -0.050, N = 55 - 80 (in PPM), the remainder being Fe and unavoidable impurities; providing the molten steel to a mold of a thin slab caster; casting the steel at a straightening and bending temperature of 1000-1040 deg. C; deforming the steel by means of a plurality of finishing stands and cooling the steel at temperature rate of 10-15 deg./s.
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