Ferritic stainless steel with improved impact toughness, and manufacturing method thereof
AssigneePosco
InventorsILCHAN JUNG, Junghyun Kong, Hyunggu Kang
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Abstract
The disclosed invention relates to a ferritic stainless steel with an improved impact toughness, and a manufacturing method thereof. A ferritic stainless steel with an improved impact toughness according to an embodiment has, in weight %: C: 0.005% to 0.015%; N: 0.005% to 0.015%; Si: 0.01% to 0.60%; Mn: 0.2% to 0.9%; Cr: 10.5% to 13.0%; Ni: 0.6% to 1.1%; Ti: 0.05% to 0.30%; B: 0.0005% to 0.0070%; P: 0.04% or less; S: 0.01% or less; and the remaining Fe and inevitable impurities, wherein the ferritic stainless steel may have an impact toughness of over 100J at −20° C.
Claims12
A ferritic stainless steel having improved impact toughness, comprising, in percent by weight (wt %), 0.005 to 0.015% of C, 0.005 to 0.015% of N, 0.01 to 0.60% of Si, 0.2 to 0.9% of Mn, 10.5 to 13.0% of Cr, 0.6 to 1.1% of Ni, 0.05 to 0.30% of Ti, 0.0005 to 0.0070% of B, 0.04% or less of P, 0.01% or less of S, and the remainder being Fe and inevitable impurities, and
- having an impact toughness of 100 J or more at −20° C.
A method of manufacturing a ferritic stainless steel having improved impact toughness, the method comprising:
- preparing a slab comprising, in percent by weight (wt %), 0.005 to 0.015% of C, 0.005 to 0.015% of N, 0.01 to 0.60% of Si, 0.2 to 0.9% of Mn, 10.5 to 13.0% of Cr, 0.6 to 1.1% of Ni, 0.05 to 0.30% of Ti, 0.0005 to 0.0070% of B, 0.04% or less of P, 0.01% or less of S, and the remainder being Fe and inevitable impurities;
- reheating the slab, and then performing rough rolling and finish rolling to produce a hot-rolled material;
- and
- coiling the hot-rolled material at 700 to 900° C. and then cooling the coiled hot-rolled material.
Dependencies are inferred from the claim text.