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: An austenitic stainless steel product having excellent surface characteristics and a manufacturing method therefor are disclosed. The disclosed austenitic stainless steel product comprises an austenitic stainless steel comprising, by weight percent, 0.005 to 0.15% of C, 0.1 to 1.0% of Si, 0.1 to 2.0% of Mn, 6.0 to 8.0% of Ni, 16 to 18% of Cr, 0.1 to 4.0% of Cu, 0.005 to 0.2% of N, 0.01 to 0.2% of Mo, and the remainder comprising iron (Fe) and other unavoidable impurities, and a Ni surface negative segregation thereof defined by the following formula (1) is 0.6 to 0.9 and the martensite fraction thereof is 10 to 30%. (CNi-Min)/(CNi-Ave)??formula (1) Here, CNi-min is the minimum concentration of Ni on the surface and CNi-Ave is the average concentration of Ni on the surface.

Abstract: An austenitic stainless steel with improved strength is disclosed. The austenitic stainless steel includes, in percent (%) by weight of the entire composition, C: 0.02 to 0.14%, Si: 0.2 to 0.6%, S: less than 0.01%, Mn: 2.0 to 4.5%, Ni: 2.5 to 5.0%, Cr: 19.0 to 22.0%, Cu: 1.0 to 3.0%, Mo: less than 1.0%, N: 0.25 to 0.40%, the remainder of iron (Fe) and other inevitable impurities, and the Solubility of Nitrogen in Liquid (SNL) value represented by the following equation (1) is equal to or greater than the content of N. Equation (1): SNL=?0.188?0.0423×C?0.0517×Si+0.012×Mn+0.0048×Ni+0.0252×Cr?0.00906×Cu+0.00021×Mo. Here, C, Si, Mn, Ni, Cr, Cu, and Mo mean the content (% by weight) of each element.

Abstract: A manufacturing method of a utility ferritic stainless steel with excellent hot workability is disclosed. The manufacturing method of a ferritic stainless steel according to an embodiment of the present disclosure includes: manufacturing a slab including, in percent (%) by weight of the entire composition, C: 0.005 to 0.020%, N: 0.005 to 0.020%, Si: 0.5 to 0.8%, Mn: 0.5 to 1.5%, Cr: 11.0 to 12.5%, Ni: 0.2 to 0.6%, P: 0.035% or less (excluding 0), S: 0.01% or less (excluding 0), the remainder of iron (Fe) and other inevitable impurities; and hot rolling the slab after heating the slab, and the heating of the slab is performed in a temperature range of 1200 to 1250° C. so that the fraction of ?-ferrite phase in the internal structure of the slab is 80 to 95%.

Abstract: An austenitic stainless steel product having excellent surface characteristics and a manufacturing method therefor are disclosed. The disclosed austenitic stainless steel product comprises an austenitic stainless steel comprising, by weight percent, 0.005 to 0.15% of C, 0.1 to 1.0% of Si, 0.1 to 2.0% of Mn, 6.0 to 8.0% of Ni, 16 to 18% of Cr, 0.1 to 4.0% of Cu, 0.005 to 0.2% of N, 0.01 to 0.2% of Mo, and the remainder comprising iron (Fe) and other unavoidable impurities, and a Ni surface negative segregation thereof defined by the following formula (1) is 0.6 to 0.9 and the martensite fraction thereof is 10 to 30%. (CNi-Min)/(CNi-Ave)??formula (1) Here, CNi-min is the minimum concentration of Ni on the surface and CNi-Ave is the average concentration of Ni on the surface.

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: Disclosed is an austenitic stainless steel with increased workability. The austenitic stainless steel includes, based on % by weight, silicon (Si): 0.1 to 0.65%, manganese (Mn): 0.2 to 3.0%, nickel (Ni): 6.5 to 10.0%, chromium (Cr): 16.5 to 20.0%, copper (Cu): 6.0% or less (excluding 0), the sum of carbon (C) and nitrogen (N): 0.08% or less (excluding 0), and the remainder being Fe and unavoidable impurities, wherein the austenitic stainless steel has a work hardening rate of 1500 MPa or less within a true strain range of 0.15 to 0.4. Therefore, when a sink bowl and the like are processed using the austenitic stainless steel, the true strain and work hardening rate of which are controlled, the occurrence of delayed fracture in a molded corner thereof, which has been subjected to a large amount of processing, can be prevented.

Abstract: An austenitic stainless steel having excellent orange peel resistance and a method for producing the same are disclosed. In the austenitic stainless steel having excellent orange peel resistance, according to an embodiment of the present disclosure, a ratio Gs/Gi of an average crystal grain size Gs of surface crystal grains included in a first area corresponding to a depth of 10% or less of a total thickness of the austenitic stainless steel from the surface of the austenitic stainless steel with respect to an average crystal grain size Gi of internal crystal grains included in a second area corresponding to a depth that is deeper than 10% of the total thickness of the austenitic stainless steel from the surface of the austenitic stainless steel may be 0.5 or smaller.

Abstract: Austenitic stainless steels excellent in flexibility are provided. The austenitic stainless steel excellent in flexibility includes, by weight percent, 0.1 to 0.65% of Si, 1.0 to 3.0% of Mn, 6.5 to 10.0% of Ni, 16.5 to 18.5% of Cr, 6.0% or less of Cu (excluding 0), 0.13% or less of (C+N) (excluding 0), and the remainder including Fe and unavoidable impurities, wherein the work hardening formula H1 defined by the following formula is 300 or less. H1=?459+79.8Si?10.2Mn?8.16Ni+48.0Cr?13.2Cu+623(C+N).

Abstract: A high-hardness martensitic stainless steel with excellent antibacterial property and a preparation method therefor are disclosed. The high-hardness martensitic stainless steel with excellent antibacterial property comprises: 0.45-0.65 wt % of C; 0.02-0.06 wt % of N; 0.1-0.6 wt % of Si; 0.3-1.0 wt % of Mn; 0.1-0.4 wt % of Ni; 13-14.5 wt % of Cr; 0.4-0.6 wt % of Mo; 0.8-1.2 wt % of W; 1.5-2.0 wt % of Cu; and the balance of Fe and inevitable impurities. According to the present disclosure, there is an advantage enabling the preparation of the martensitic stainless steel for knives, the martensitic stainless steel having high hardness, high corrosion resistance and excellent antibacterial property, by uniformly distributing fine chromium carbide and e-Cu precipitates in the microstructure of a batch annealed material of a high-carbon martensitic stainless steel containing Cu. In addition, there is an advantage of causing no rust formation on a material after an antibacterial evaluation.

Abstract: A hot-rolled stainless steel sheet having excellent hardness and low-temperature impact properties, in which a ferrite is formed with martensite as a matrix structure, is manufactured by a steel manufacturing process, a continuous casting process, and a hot-rolling process. The hot-rolled stainless steel sheet comprises C, N, Si, Mn, Cr, Ni, Ti, Nb, Mo, and the remainder being Fe and other inevitable impurities, wherein C is 0.01 to 0.03 wt %, Cr is 11 to 14 wt %, Ti is 0.1 to 0.2 wt %, and Nb is 0.1 to 0.2 wt %. The ferrite stability (FS) expressed by the following [formula 1] is 5 to 50, and a ferrite is formed with martensite as a matrix structure. [Formula 1] 4 FS=?215?619C?16.6Mn+23.7Cr?36.8Ni+42.2Mo+96.2Ti+67Nb?237N+17.2Si, wherein the numerical value of each component described in [Formula 1] denotes the content (wt %) of each component.

Abstract: A hot-rolled stainless steel sheet having excellent hardness and low-temperature impact properties, in which a ferrite is formed with martensite as a matrix structure, is manufactured by a steel manufacturing process, a continuous casting process, and a hot-rolling process. The hot-rolled stainless steel sheet comprises C, N, Si, Mn, Cr, Ni, Ti, Nb, Mo, and the remainder being Fe and other inevitable impurities, wherein C is 0.01 to 0.03 wt %, Cr is 11 to 14 wt %, Ti is 0.1 to 0.2 wt %, and Nb is 0.1 to 0.2 wt %. The ferrite stability (FS) expressed by the following [formula 1] is 5 to 50, and a ferrite is formed with martensite as a matrix structure. [Formula 1] 4 FS=?215?619C?16.6Mn+23.7Cr?36.8Ni+42.2Mo+96.2Ti+67Nb?237N+17.2Si, wherein the numerical value of each component described in [Formula 1] denotes the content (wt %) of each component.

Abstract: The present invention relates to a production method for high-carbon martensitic stainless steel as used in razorblades, knives and the like, which contains, as percentages by weight, 0.40 to 0.80% carbon and 11 to 16% chromium as main components. Provided is a production method for high-carbon martensitic stainless steel in a strip-casting device, wherein a stainless-steel thin sheet is cast by supplying a stainless molten steel containing, as percentages by weight, 0.40 to 0.80% carbon and from 11 to 16% chromium to a molten steel pool from a tundish via a nozzle, and the cast stainless-steel thin sheet is made into a hot-rolled annealed strip using in-line rollers to a rolling reduction of 5 to 40% immediately just after the casting so that the size of primary carbides within the microstructure of the hot-rolled annealed strip is 10 ?m or less, and also provided is martensitic stainless steel produced by means of the production method.