Abstract: This ferritic stainless steel for components of an automobile exhaust system includes, in terms of percent by mass: C: ?0.015%; Si: 0.01% to 0.50%; Mn: 0.01% to 0.50%; P: ?0.050%; S: ?0.010%; N: ?0.015%; Al: 0.010% to 0.100%; Cr: 16.5% to 22.5%; Ni: 0.5% to 2.0%; and Sn: 0.01% to 0.50%, and further includes either one or both of Ti: 0.03% to 0.30% and Nb: 0.03% to 0.30%, with a remainder being Fe and inevitable impurities.

Abstract: The present invention provides a Sn-containing ferritic stainless steel sheet having excellent heat resistance. The ferritic stainless steel contains, in terms of mass %, 0.015% or less of C, 1.5% or less of Si, 1.5% or less of Mn, 0.035% or less of P, 0.015% or less of S, 13-21% of Cr, 0.01-0.50% of Sn, 0.05-0.60% of Nb and 0.020% or less of N, with the remainder consisting of Fe and unavoidable impurities. The ferritic stainless steel satisfies formula 1 and formula 2, and has a grain boundary Sn concentration of 2 atom % or less when subjected to a heat treatment at 600-750° C. in which the value of L, as shown in formula 3, is 1.91×104 or higher. 8?CI=(Ti+0.52Nb)/(C+N)?26 (formula 1) GBSV=Sn+Ti?2Nb?0.3Mo?0.2?0 (formula 2) L=(273+T)(log(t)+20) (formula 3) I: Temperature (° C.

Abstract: High strength dual-phase stainless steel sheet and steel strip which are excellent in corrosion resistance, the dual-phase stainless steel sheet and steel strip having a Vicker's hardness of 200HV or more and comprising, by mass %, C: 0.02 to 0.20%, Si: 0.10 to 2.0%, Mn: 0.20 to 2.0%, P: 0.040% or less, S: 0.010% or less, Cr: 15.0 to 18.0%, Ni: 0.5 to 4.0%, Sn: 0.05 to 0.50, N: 0.010 to 0.10%, and a balance of Fe and unavoidable impurities. The dual-phase stainless steel sheet and steel strip have a ?p range of 60 to 95, and a ferrite and martensite dual-phase microstructure formed by being heated to the ferrite and austenite dual-phase region, then the austenite phase transforming to martenite in the subsequent cooling process, wherein ?p=420C+470N+23Ni+7Mn+9Cu?11.5Cr?11.5Si?12Mo?7Sn?49Ti?47Nb?52Al+189.

Abstract: The present invention is directed to a stainless steel brake disc which is excellent in toughness, corrosion resistance, and wear resistance, and comprises, in % by mass, 0.030 to 0.080% of C, 0.05% to 1.0% of Si, 1.0 to 1.5% of Mn, 0.035% or less of P, 0.015% or less of S, 11.0 to 14.0% of Cr, 0.01 to 0.50% of Ni, 0.001 to 0.15% of V, less than 0.1% of Nb, 0.05% or less of Ti, 0.05% or less of Zr, 0.05% or less of Al, 0.015 to 0.060% of N, 0.0002% or more and 0.0050% or less of B, and 0.0080% or less of O, wherein an AT value of equation 1 is 0.055 to 0.090, equation 2 is satisfied, a ferrite phase fraction, in which an IQ value of an EBSD pattern is 4,000 or more, is 1% to 15%, a Charpy impact value is 50 J/cm2 or more, and hardness is 32 to 38 HRC. C+0.8(N?B)??(1) PV=1.2Ti+0.8Zr+Nb+1.1Al+O?0.

Abstract: Ferritic stainless steel sheet for an exhaust part which has little deterioration in strength even if undergoing long term heat history and is low in cost, excellent in heat resistance and workability characterized by containing, characterized by containing, by mass %, C: less than 0.010%, N: 0.020% or less, Si: over 0.1% to 2.0%, Mn: 2.0% or less, Cr: 12.0 to 25.0%, Cu: over 0.9 to 2%, Ti: 0.05 to 0.3%, Nb: 0.001 to 0.1%, Al: 1.0% or less, and B: 0.0003 to 0.003%, having a Cu/(Ti+Nb) of 5 or more, and having a balance of Fe and unavoidable impurities.

Abstract: The present invention provides an optimum low-chromium stainless steel which prevents corrosion resistance degradation of a weld in the case of welding a low-chromium stainless steel utilizing martensite transformation in multiple passes (multipass), is excellent in weld intergranular corrosion resistance even in a severe corrosion environment, simultaneously avoids occurrence of preferential corrosion at the bond-bordering region of the weld heat-affected zone, and is also excellent in productivity, which low-chromium stainless steel comprises, in mass %, C: 0.015 to 0.025%, N: 0.008 to 0.014%, Si: 0.2 to 1.0%, Mn: 1.0 to 1.5%, P: 0.04% or less, S: 0.03% or less, Cr: 10 to 13%, Ni 0.2 to 1.5%, and Al: 0.005 to 0.1% or less, and further comprises Ti: 6×(C %+N %) or greater and 0.25% or less, the balance being Fe and unavoidable impurities, and the contents of the elements satisfy specified expressions.

Abstract: The present invention focuses on Sn and has as its problem to not only improve the corrosion resistance and rust resistance of Cr-containing ferritic stainless steel but also improve the ridging resistance. The present invention derives the relationship between Ap, which shows the ?-phase rate at 1100° C. due to a predetermined ingredient, and Sn in ferritic stainless steel which becomes a dual phase structure of ?+? in the hot rolling temperature region, applies and adds Sn, and hot rolls the steel to give a total rolling rate of 15% or more in 1100° C. or higher hot rolling to thereby obtain ferritic stainless steel sheet which has good ridging resistance, which also has excellent corrosion resistance and rust resistance, and which can be applied to general durable consumer goods: 0.060?Sn?0.634?0.

Abstract: This hot-rolled ferritic stainless steel sheet has a steel composition containing, in terms of % by mass: 0.02% or less of C; 0.02% or less of N; 0.1% to 1.5% of Si; 1.5% or less of Mn; 0.035% or less of P; 0.010% or less of S; 1.5% or less of Ni; 10% to 20% of Cr; 1.0% to 3.0% of Cu; 0.08% to 0.30% of Ti; and 0.3% or less of Al, with the balance being Fe and unavoidable impurities, and the hot-rolled ferritic stainless steel sheet has a Vickers hardness of less than 235 Hv.

Abstract: A heat-resistant ferritic stainless steel sheet having excellent oxidation resistance while being low in cost and optimal for use in exhaust system components, wherein mass % falls within the following ranges: C: 0.015% or less, N: 0.020% or less, P: 0.04% or less, S: 0.001% or less, Si: 0.3-1.5% or less, Mn: 0.3-0.7% or less, Cr: 11.0-17.0%, Cu: 0.8-1.5%, Ni: 0.05-1.0%, V: 0.5% or less, Al: over 0.01 up to 0.1%, Ti: 10(C+N) to 0.3%. Also, the element content of the elements in the ferritic stainless steel sheet having excellent oxidation and thermal resistance has been mutually adjusted in a manner such that the value of ? defined in formula (1) is 35 or less. ?=23[% Ni]+9[% Cu]+7[% Mn]?11.5[% Cr]?11.

Abstract: High strength dual-phase structure stainless steel sheet and steel strip which are excellent in corrosion resistance, the dual-phase structure stainless steel sheet and steel strip having a Vicker's hardness of 200 HV or more and characterized by containing, by mass %, C: 0.02 to 0.20%, Si: 0.10 to 2.0%, Mn: 0.20 to 2.0%, P: 0.040% or less, S: 0.010% or less, Cr: 15.0 to 18.0%, Ni: 0.5 to 4.0%, Sn: 0.05 to 0.50, and N: 0.010 to 0.10%, having a ?p of 60 to 95 in range, having a balance of substantially Fe, and having a ferrite and martensite dual-phase structure formed by being heated to the ferrite and austenite dual-phase region, then the austenite phase transforming to martenite in the subsequent cooling process, where ?p=420C+470N+23Ni+7Mn+9Cu?11.5Cr?11.5Si?12Mo?7Sn?49Ti?47Nb?52Al+189.

Abstract: Ferritic stainless steel sheet for an exhaust part which has little deterioration in strength even if undergoing long term heat history and is low in cost, excellent in heat resistance and workability characterized by containing, characterized by containing, by mass %, C: less than 0.010%, N: 0.020% or less, Si: over 0.1% to 2.0%, Mn: 2.0% or less, Cr: 12.0 to 25.0%, Cu: over 0.9 to 2%, Ti: 0.05 to 0.3%, Nb: 0.001 to 0.1%, Al: 1.0% or less, and B: 0.0003 to 0.003%, having a Cu/(Ti+Nb) of 5 or more, and having a balance of Fe and unavoidable impurities.

Abstract: This ferritic stainless steel for components of an automobile exhaust system includes, in terms of percent by mass: C: ?0.015%; Si: 0.01% to 0.50%; Mn: 0.01% to 0.50%; P: ?0.050%; S: ?0.010%; N: ?0.015%; Al: 0.010% to 0.100%; Cr: 16.5% to 22.5%; Ni: 0.5% to 2.0%; and Sn: 0.01% to 0.50%, and further includes either one or both of Ti: 0.03% to 0.30% and Nb: 0.03% to 0.30%, with a remainder being Fe and inevitable impurities.

Abstract: The present invention provides an optimum low-chromium stainless steel which prevents corrosion resistance degradation of a weld in the case of welding a low-chromium stainless steel utilizing martensite transformation in multiple passes (multipass), is excellent in weld intergranular corrosion resistance even in a severe corrosion environment, simultaneously avoids occurrence of preferential corrosion at the bond-bordering region of the weld heat-affected zone, and is also excellent in productivity, which low-chromium stainless steel comprises, in mass %, C: 0.015 to 0.025%, N: 0.008 to 0.014%, Si: 0.2 to 1.0%, Mn: 1.0 to 1.5%, P: 0.04% or less, S: 0.03% or less, Cr: 10 to 13%, Ni 0.2 to 1.5%, and Al: 0.005 to 0.1% or less, and further comprises Ti: 6×(C %+N %) or greater and 0.25% or less, the balance being Fe and unavoidable impurities, and the contents of the elements satisfy specified expressions.

Abstract: Ferritic stainless steel excellent in heat resistance and workability which contains, by mass %, C: 0.02% or less, N: 0.02% or less, Si: 2% or less, Mn: 2% or less, Cr: 10 to 20%, Cu: 0.4 to 3%, Ti: 0.01 to 0.5%, and B: 0.0002 to 0.0030% and has a balance of Fe and unavoidable impurities.

Abstract: The present invention provides optimal low chromium stainless steel preventing the deterioration in corrosion resistance at the weld zone in the case of multipass welding, superior in grain boundary corrosion resistance of the weld zone even in a harsh corrosive environment, simultaneously free from preferential corrosion at the heat affected zones near weld fusion lines, and further superior in manufacturability, that is, low chromium stainless steel containing, by mass %, C: 0.03% or less, N: 0.004 to 0.02%, Si: 0.2 to 1%, Mn: over 1.5 to 2.5%, P: 0.04% or less, S: 0.03% or less, Cr: 10 to 15%, Ni: 0.2 to 3.0%, and Al: 0.005 to 0.1%, further containing Ti: 4×(C %+N %) to 0.35%, and having a balance of Fe and unavoidable impurities, having a ?p(%) expressed by a predetermined formula satisfying 80 or more, and satisfying Ti %×N %<0.004 as well.

Abstract: The present invention provides optimal low chromium stainless steel preventing the deterioration in corrosion resistance at the weld zone in the case of multipass welding, superior in grain boundary corrosion resistance of the weld zone even in a harsh corrosive environment, simultaneously free from preferential corrosion at the heat affected zones near weld fusion lines, and further superior in manufacturability, that is, low chromium stainless steel containing, by mass %, C: 0.03% or less, N: 0.004 to 0.02%, Si: 0.2 to 1%, Mn: over 1.5 to 2.5%, P: 0.04% or less, S: 0.03% or less, Cr: 10 to 15%, Ni: 0.2 to 3.0%, and Al: 0.005 to 0.1%, further containing Ti: 4×(C %+N %) to 0.35%, and having a balance of Fe and unavoidable impurities, having a ?p(%) expressed by a predetermined formula satisfying 80 or more, and satisfying Ti %×N %<0.004 as well.

Abstract: An apparatus for the production of a stainless steel strip comprising the following devices provided in sequence: a twin-drum continuous casting machine; an atmosphere control cover having in its interior a bridle roll or a pinch roll; a hot-rolling machine; a heat-treating furnace comprising direct fire burners connected to header pipes juxtaposed to one another in the widthwise direction of the furnace over the longitudinal direction of the furnace; a cooler; and a coiler.

Abstract: To produce a thin strip having a high cast strip toughness from a thin cast strip of a Cr-stainless steel containing Nb, Ti, and Al in an amount of 0.05% or more, a process includes the steps of: casting a thin cast strip of a Cr-stainless steel having a thickness of 10 mm or less, the steel containing 13-25 wt % of Cr, 0.05-1 wt % of one or more of Nb, Ti, Al and V in terms of a total amount, 0.03 wt % or less of C, 0.03 wt % or less of N, and 0.3-3.0 wt % of Mo in accordance with need, and having a .gamma.p value of 0% or less; hot-rolling the thin cast strip in a temperature range of from 1150.degree. to 950.degree. C. at a reduction in thickness of 5 to 50% to form a thin strip; either slowly cooling the thin strip at a rate of 20.degree. C./sec or less or holding the thin strip for 5 sec or more, in a temperature range of from 1150.degree. to 950.degree. C.; and then coiling the thin strip at a temperature lower than 700.degree. C..gamma.p(%)=420C+470N+23Ni+9Cu+7Mn-11.5Cr-11.

Abstract: An austenitic stainless steel sheet is produced by a twin-roll synchronous continuous casting process wherein the sheet has a Ni segregation ratio in the vicinity of its center section of 0.90 or more and .delta.Fe.sub.cal. (mass %) is 6 mass % or more. Ni segregation ratio is defined by the formula: {average Ni content of the segregated portion (%) }/{average Ni content of the cast sheet (%)}; where Ni content is expressed in % by mass. .delta.-Fe.sub.cal. (mass %) is defined by the formula: 3(Cr+1.5 Si+Mo+0.5 Nb)-2.8(Ni+0.5 Cu+0.5 Mn+30 C+30 N)-19.8; wherein the chemical elements are given in % by mass.

Abstract: This invention relates to a austenitic stainless steel thin sheet devoid of work-surface roughening, produced by a continuous casting method of a strip comprising a composition which contains not greater than 0.09% of C+N and has an Md.sub.30 of 30.degree. to 60.degree. C., and in which colonies A comprising {112}<111>, etc., and colonies B comprising {110}<111>, etc., exist in a uniform mixture in the steel sheet. As to colony dimensions, d.sub.RD (A) and d.sub.RD (B) are not greater than 300 .mu.m and d.sub.TD (A) and d.sub.TD (B) are not greater than 200 .mu.m. Solidification cooling is carried out at a cooling rate of at least 100.degree. C./sec, and cooling is carried out to 1,200.degree. C. at a rate of 50.degree. C./sec after solidification. Cold rolling is effected by twice cold rolling with interposed intermediate annealing. In this way, there can be obtained a austenitic strip cast stainless steel sheet not causing work-surface roughening.