CHROMIUM ALLOY FERRITIC STEEL, METHOD OF MAKING THE SAME, AND CHROMIUM ALLOYED FERRITIC STEEL SHEET

摘要

The present invention relates to a stainless steel and a method of manufacturing the non-ferritic ridging. Sufficient titanium and the chromium alloy steel melt containing the Al amount control gatjiman the nitrogen has a fine equiaxed crystal structure of the casting or cast ingot is cast to a state in a continuous strip or slab without essentially columnar crystals. The steel of the cast state is 0.08% by weight C, at least about 8 weight% Cr and 1.5% or less of Mn and, as below about 0.020 wt% Al, and 0.05% by weight of less than N, not more than 1.5 wt% Si and satisfying the ratio of less than 2.0% by weight Ni and 0.1 to 0.25 contains Ti in wt%, (Ti x N) / Al ≥ 0.14, and the remainder contains the iron and residual elements. Titanium is preferably controlled so that (Ti / 48) / [(C / 12) + (N / 14)] 1.5. Hot processed steel sheet may be formed from a continuously cast slab without grinding the slab surface. Hot-milled steel is de-scaled, may be annealed cold-rolled to a final thickness and recrystallization. It is not essentially necessary to no ridging annealed prior to cold rolling the hot finished steel sheet annealing to obtain steel sheet having an excellent formability by.