Abstract: A flexible tube for the exhaust system of an automobile made from a stainless steel is disclosed, which consists essentially of, by weight %:______________________________________ C: at most 0.03%, Si: 0.1-2.0%, Mn: at most 2.0%, Cr: 18-26%, Ni: 16-30%, Mo: 1.0-3.0%, Ti: 0-0.25%, Nb: 0-1.5%, and ______________________________________a remainder of Fe and incidental impurities, of the impurities, the amount of oxygen being .ltoreq.50 ppm, the amount of S being .ltoreq.20 ppm, and the amount of P being .ltoreq.150 ppm, and the amounts of O, S, and P satisfying the formula1350>25X Oxygen+20XS+P (ppm).

Abstract: A method for manufacturing a hard-to-work alloy article comprises the steps of: preparing a laminate member comprising a plurality of layers of different metals in a stoichiometric ratio for the intended alloy composition; dividing the laminate member into pieces; combining the pieces to a body for plastic deformation; subjecting the body to plastic deformation under pressure to form an article having a given shape and dimensions; and applying a thermal diffusion treatment to the article.

Abstract: A corrosion-resistant steel tube such as a sheath heater steel tube and boiler tube which exhibit improved resistance to dry corrosion under high temperature dry-corrosive conditions in the presence of chlorides is disclosed. The steel consists essentially of, in % by weight:______________________________________ C: not more than 0.05%, Si: 0.1-2.0%, Mn: not more than 2.0%, Cr: 18-26%, Ni: 16-30%, ______________________________________at least one of Mo: 0.5-4.0%, W: 0.01-4.00%, andV: 0.01-4.00%,N: 0-0.25%,(Ti+Nb): 0-1.5%, andthe balance iron and incidental impurities.

Abstract: A corrosion-resistant steel tube such as a sheath heater steel tube and boiler tube which exhibit improved resistance to dry corrosion under high temperature dry-corrosive conditions in the presence of chlorides is disclosed. The steel consists essentially of, in % by weight:C: not more than 0.05%,Si: 0.1-2.0%, Mn: not more than 2.0%,Cr: 18-26%, Ni: 16-30%,at least one of Mo: 0.5-4.0%, W: 0.01-4.00%, andV: 0.01-4.00%,N: 0-0.25%,(Ti+Nb): 0-1.5%, andthe balance iron and incidental impurities.

Abstract: This invention relates to a manufacturing process for plate or forging (bar, stamp work or the like) of ferrite-austenite two-phase stainless steel, containing C at 0.03% or below, Si at 2.0% or below, Mn at 2.0% or below, Cr at 25 to 35%, Ni at 6 to 15%, N at 0.35% or below, and Fe and inevitable impurity for the remainder with or without adding B at 0.001 to 0.030% with the following nickel balance value specified at -3 to -9 and comprising an average crystal grain size at 0.015 mm or below from heating an ingot of the above mentioned ferrite-austenite two-phase stainless steel at 1,200.degree. C. or below and keeping a forging ratio by hot working at 5 or over.Ni balance value=Ni %+0.5 Mn %+30.times.(C+N) %-1.1(Cr %+1.5 Si %)+8.

Abstract: This invention relates to a welding material for welding a high-Si austenite stainless steel, capable of ensuring a high corrosion resistance of the weld metal in hot nitric acid of high concentration, while maintaining a toughness of the weld metal not smaller than 2 Kg-m/cm.sup.2, and the method of application therefor. The welding material has a composition containing not greater than 0.015% of C, 5 to 7% of Si, not greater than 2% of Mn, 15 to 20% of Cr, 10 to 22% of Ni, not greater than 0.02% of N, not greater than 0.45% of one or both of Nb and Ta, and the balance substantially Fe and inevitable impurities the sum of C and N contents is selected to be not greater than 0.03% and the sum of Nb and Ta contents is selected to be not smaller than 15.times.(C+N)%. The Ni-balance value given by the following formula ranges between -4 and -2.Ni balance value=% Ni+30(%C+%N)+0.5(%Mn)-1.1(%Cr+1.5.times.%Si)+8.

Abstract: This invention relates to a welding material of ferrite-austenite two-phase stainless steel capable of producing a weld metal having a high resistance to corrosion, particularly in an environment containing nitric acid, and the method of application therefor. The welding material consists essentially of not more than 0.03% of C, not more than 2.0% of Si, not more than 2.0% of Mn, 25 to 30% of Cr, 7 to 12% of Ni, not more than 0.35% of N, and the balance Fe and inevitable impurities. The Ni balance value given by the following formula ranges between -11.7 and -6.7:Ni balance value=Ni%+0.5.times.Mn%+30.times.(C+N)%-1.1 (Cr%+1.5.times.Si%)+8.2.

Abstract: The present invention relates to the austenitic steel having improved resistance to oxidation at the high temperature, comprising not more than 0.10% C, 0.1-5.0% Si, not more than 3% Mn, 7-45% Ni, 15-30% Cr and sulfur content being restricted to not more than 0.003%. According to the present invention, by limiting the sulfur content in the austenitic steel to not more than 0.003%, preferably to not more than 0.0015%, the heat-resisting steel material which can show improved resistance to oxidation under severe conditions including repeated heating to high temperatures and cooling to room temperature is provided.

Abstract: A process for producing heat-resistant ferritic stainless steel sheet which exhibits improved toughness and productivity is disclosed. The process comprises the following steps:(a) hot rolling a steel with a finishing temperature of not higher than 850.degree. C., said steel comprising, by weight %,C: not more than 0.07%,Si: 1.5-3.5%,Mn: not more than 2.0%,Cr: 10-25% ,N: not more than 0.05%,Nb: 5X(C %+N %)-20X(C %+N %),optionally at least one element selected from the group consisting of Al, Y, Ca, and REM in a total amount of 0.3% or less, andthe balance iron and incidental impurities; and(b) annealing the resulting hot rolled steel sheet at a temperature of 820.degree.-1000.degree. C.Cold rolling may be applied to the annealed hot-rolled steel sheet.

Abstract: A ferritic stainless steel containing 12.00-25.00% of Cr, 0.1-2.0% of Cu and 0.2-2.0% of Nb with sulfur being restricted to not greater than 0.02%, preferably not greater than 0.005% is hot rolled with a finishing temperature of 850.degree. C. or less, which is lower than the usual finishing temperature, and the resulting hot rolled steel strip is annealed at a relatively high temperature of 950.degree.-1050.degree. C. The resulting cold rolled steel sheet, though it is less expensive, possesses good formability, ridging resistance, surface appearance and corrosion resistance, and is particularly suitable for making ornamental articles, such as automotive mouldings.

Abstract: A 10-35% Cr ferritic stainless steel stabilized with 0.20-1.00% of Nb wherein Nb%.gtoreq.(8.times.C%+2.0%) with impurities, such as carbon, nitrogen, phosphorous, oxygen and sulfur reduced to given levels is disclosed. By reducing the sulfur content to a level of not greater than 0.002%, preferably less than 0.001% or in cases where copper and/or nickel is added, to a level of not greater than 0.005%, the corrosion resistance of the resulting steel can markedly be improved. Since the ferritic stainless steel of this invention also exhibits a combination of good surface appearance and formability, it can be substituted for certain austenitic stainless steels not only as a general corrosion resistant material, but also as a material for making external automotive trims and so on.

Abstract: A high-silicon-nickel-chromium steel resistant to concentrated nitric acid with a good workability and a good weldability, comprisingcarbon in an amount of not more than 0.03% (C.ltoreq.0.03%),silicon in an amount of from more than 5% to not more than 7% (5%<Si.ltoreq.7%),manganese in an amount of not more than 10% (Mn.ltoreq.10%),chromium in an amount of from not less than 7% to not more than 16% (7%.ltoreq.Cr.ltoreq.16%),nickel in an amount of from not less than 10% to less than 19% (10%.ltoreq.Ni.ltoreq.19%),and the balance being iron and inevitable impurities,percentages being by weight.

Abstract: A ferritic stainless steel having improved weldability and oxidation resistance, consisting essentially of 11.0 - 20.0% by weight of Cr, less than 0.10% by weight of C, less than 1.5% by weight of Si, less than 1.5% by weight of Mn, less than 1.5% by weight of Zr, the ratio of (Zr%)/(C% + N%) being higher than 7, and the balance of Fe, and the nitrogen amount being restricted to less than 0.015% by weight.