Abstract: Disclosed is a stainless steel for a separator of a polymer fuel cell having excellent corrosion resistance. More particularly, disclosed is a stainless steel for a separator of a polymer fuel cell having excellent corrosion resistance in a sulfuric acid environment which is a fuel cell operating environment. According to an embodiment, the stainless steel for a separator of a polymer fuel cell includes, in percent by weight (wt %), 0.09% or less of C, 1.0% or more and less than 2.5% of Si, 1.0% or less (excluding 0) of Mn, 0.003% or less of S, 20 to 23% of Cr, 9 to 13% of Ni, 1.0% or less (excluding 0) of W, 0.10 to 0.25% of N, and the remainder of Fe and other inevitable impurities, wherein a corrosion resistance index represented by Formula (1) below is 7 or more. 3*W+1.5*Si+0.1*Cr+20*N?2*Mn??(1) In Formula (1), W, Si, Cr, N, and Mn represent the content (wt %) of each element.

Abstract: Provided is an austenitic stainless steel having excellent hot workability and exhibiting enhanced corrosion resistance of welded parts of hot-rolled and cold-rolled materials. The austenitic stainless steel having excellent corrosion resistance of welded parts according to an embodiment of the present disclosure includes, in percent (%) by weight, 0.02 to 0.07% of C, 0.2 to 0.7% of Si, 2.5 to 4.0% of Mn, 2.5 to 4.0% of Ni, 17.0 to 19.0% of Cr, less than 0.1% of P, less than 0.01% of S, 1.0 to 3.0% of Cu, 0.1 to 0.2% of N, and the remainder of Fe and other inevitable impurities, wherein a crack resistance index (CRN) represented by Formula (1) below is equal to or greater than 0. CRN=542+715C?27Si?1.49Mn+38.8Ni?52.5Cr+35.

Abstract: Provided is a lean duplex stainless steel having excellent bending processability. The lean duplex stainless steel includes, in percent (%) by weight of the entire composition, 0.01 to 0.06% of carbon (C), 0.2 to 1.0% of silicon (Si), 3.5 to 6.5% of manganese (Mn), 18.5 to 22.5% of chromium (Cr), 0.05 to 0.25% of nitrogen (N), and the remainder of iron (Fe) and other inevitable impurities, wherein a sum of amounts of Cr and Mn is from 26.0 to 28.5% and a Cr/Mn ratio is from 3.4 to 4.1.

Abstract: Provided is a lean duplex stainless steel used in industrial facilities including fresh water, pulp and paper making, chemical and construction facilities. The lean duplex stainless steel comprises, in weight percentage (%), C: over 0 to 0.06 or less, Si: over 0 to 1.5% or less, Mn: over 0 to 2% or less, Cr: 19 to 23%, Ni: 1.8 to 3.5%, Mo: 0.5 to 1.0%, Cu: 0.3 to 1.0%, N: 0.16 to 0.30%, Al: 0.003 to 0.05%, B: 0.001 to 0.005% and Ca: 0.001 to 0.01%. In the stainless steel, the content of O of the stainless steel is 0.01% or less. The stainless steel comprises Fe and other unavoidable impurities as remnants.

Abstract: A lean duplex stainless steel and a method of manufacturing the same are disclosed. A lean duplex stainless steel according to an embodiment of the present invention comprises, by weight percent, 0.05 to 0.1% of carbon (C), 2.0 to 4.0% of silicon (Si), 4.0 to 8.0% of manganese (Mn), 13.0 to 15.0% of chromium (Cr), 0.05 to 0.15% of nitrogen (N), with the remainder being iron (Fe) and other unavoidable impurities. Therefore, it is possible to minimize the manufacturing costs by minimizing or excluding the alloy components of Cr, Ni, Mo, and the like. in the component system of the duplex stainless steel, to secure an elongation of 30% or more and to secure a corrosion resistance level of 400 series general steel.

Abstract: Provided is a martensitic stainless steel having excellent productivity and high corrosion resistance, which comprises, as percentages by weight, 0.45 to 0.60% carbon, 0.02 to 0.08% nitrogen, 0.2 to 0.4% silicon, 0.3 to 0.6% manganese, 12 to 15% chromium, one or more kinds of 0.1 to 1.5% molybdenum or 0.1 to 1.5% tungsten and Fe and other unavoidable impurities as remnants.

Abstract: Provided is a lean duplex stainless steel used in industrial facilities including fresh water, pulp and paper making, chemical and construction facilities. The lean duplex stainless steel comprises, in weight percentage (%), C: over 0 to 0.06 or less, Si: over 0 to 1.5% or less, Mn: over 0 to 2% or less, Cr: 19 to 23%, Ni: 1.8 to 3.5%, Mo: 0.5 to 1.0%, Cu: 0.3 to 1.0%, N: 0.16 to 0.30%, Al: 0.003 to 0.05%, B: 0.001 to 0.005% and Ca: 0.001 to 0.01%. In the stainless steel, the content of O of the stainless steel is 0.01% or less. The stainless steel comprises Fe and other unavoidable impurities as remnants.

Abstract: Provided is a martensitic stainless steel having excellent productivity and high corrosion resistance, which comprises, as percentages by weight, 0.45 to 0.60% carbon, 0.02 to 0.08% nitrogen, 0.2 to 0.4% silicon, 0.3 to 0.6% manganese, 12 to 15% chrome, one or more kinds of 0.1 to 1.5% molybdenum or 0.1 to 1.5% tungsten and Fe and other unavoidable impurities as remnants.