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AssigneePosco
InventorsSeong-In Jeong, Yun-Yong Lee, Il-Goo Lee, Sung-Jin Park, Hee-Kyung Moon, Tae-Wook Kang
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Provided is a martensitic stainless steel produced by a twin roll strip casting process and a method for manufacturing the same, wherein the hot rolled steel has superior crack resistance. The martensitic stainless hot rolled steel sheet comprises, by weight %, C:0.1 to 1.5%, Cr:12 to 15%, Ni:1% or lower, Ti:0.005 to 0.1%, and the balance Fe and unavoidably added impurities, and wherein a primary chrome carbide precipitated at a grain boundary is fragmented and refined. Provided is a high hardness martensitic stainless cold rolled steel sheet manufactured by annealing and cold rolling the hot rolled steel sheet, and a method for manufacturing the same. A twin roll strip casting process is applied, and grain boundary strengthening elements are added to prevent center segregation, crack and strip breakage during casting, thereby ensuring the stability of the casting process.
A martensitic stainless hot rolled steel sheet having superior crack resistance, manufactured by a twin roll strip casting process and comprising 0.1˜1.5% of C, 12˜15% of Cr, 1% or less of Ni, 0.005˜0.1% of Ti, and a balance of Fe and other inevitable impurities by wt %, wherein primary chromium carbides precipitated at grain boundaries are fragmented and refined.
A martensitic stainless cold rolled steel sheet having high hardness, manufactured by a twin roll strip casting process and comprising 0.1˜1.5% of C, 12˜15% of Cr, 1% or less of Ni, 0.005˜0.1% of Ti, and a balance of Fe and other inevitable impurities by wt %, wherein spherical secondary chromium carbides are finely distributed.
A method of manufacturing a martensitic stainless cold rolled steel sheet having high hardness, comprising:
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