Abstract: An iron-based alloy with improved performance with exposure to oxygen-sulfur mixed gases with the alloy containing about 9-30 wt. % Cr and a small amount of Nb and/or Zr implanted on the surface of the alloy to diffuse a depth into the surface portion, with the alloy exhibiting corrosion resistance to the corrosive gases without bulk addition of Nb and/or Zr and without heat treatment at temperatures of 1000.degree.-1100.degree. C.

Abstract: A high-chromium stainless steel alloy having improved resistance to stress corrosion cracking in high temperature water is comprised of, in weight percent; about 22 to 32 percent chromium, about 16 to 40 percent nickel, up to about 10 percent manganese, up to about 0.06 percent carbon, and the balance substantially iron. A preferred high-chromium alloy is further comprised of about 2 to 9 weight percent of a metal from the group consisting of titanium, niobium, tantalum, and mixtures thereof. Another preferred high-chromium alloy is further comprised of a platinum group metal in an effective amount to reduce the corrosion potential of the alloy in high-temperature water provided with hydrogen.

Abstract: A precipitation hardening, high strength alloy, characterized by a low, controlled co efficient of thermal expansion and resistance to hydrogen environment embrittlement.

Abstract: A stainless maraging steel and process having high strength, high toughness and high corrosion resistance. The alloy consists of from 8 to 12% by weight Cr, 7 to 12% by weight Ni, 2 to 6% by weight W, 0.1 to 0.5% by weight Al, 0.1 to 0.4% by weight Ti, and the balance iron.

Abstract: A high-strength, heat-resistant steel with improved formability is disclosed, which consists essentially of, by weight %:______________________________________ C: 0.05-0.30%, Si: not greater than 3.0%, Mn: not greater than 10%, Cr: 15-35%, Ni: 15-50%, Mg: 0.001-0.02%, B: 0-0.01%, Zr: 0-0.10%, Ti: 0-1.0%, Nb: 0-2.0%, Al: 0-1.0%, and Mo: 0-3.0%, W: 0-6.0%, (Mo + 1/2 W = 3.0% or less) ______________________________________a balance of Fe and incidental impurities, of the impurities, oxygen and nitrogen being restricted to 50 ppm or less and 200 ppm or less, respectively, and the austenite grain size number being restricted to No. 4 or coarser.

Abstract: A heat-resistant alloy comprising, in % by weight, 0.3-0.8% of C, 0.5-3% of Si, over 0% to not greater than 2% of Mn, at least 23% to less than 30% of Cr, 40-55% of Ni, 0.2-1.8% of Nb, over 0.08% to not greater than 0.2% of N, 0.01-0.5% of Ti and/or 0.01-0.5% of Zr, and the balance Fe and inevitable impurities. The alloy is usable at high temperatures exceeding 1100.degree. C. with high creep rupture strength and excellent resistance to oxidation and to carburization, further exhibiting high creep deformation resistance at high temperatures and high ductility after aging.

Abstract: A high strength stainless steel having a tensile strength of not less than 230 kgf/mm.sup.2 is disclosed, which comprises 0.01-0.015 st % of C and/or N, 1.0-4.0 wt % of Cu, 9.5-10.9 wt % of Ni, 12.0-17.0 wt % of Cr, 0.5-2.5 wt % of Al and/or Ti, 0.003-0.011 wt % of B, 0.02-0.2 wt % of Be and the balance of Fe, and has a temperature (Md.sub.30) of transforming 50% of austenite into martensite under a true strain of 0.3 within a range of from room temperature to -196.degree. C.

Abstract: The oxidation resistance at elevated temperatures, e.g. 1800.degree. F. of iron-nickel-chromium alloys of specified composition is improved through the control of manganese content.

Abstract: Particularly important properties required for exterior protective members for sheathing heaters are resistance to oxidation, anti-stress corrosion properties and weldability. An austenitic stainless steel for the exterior protective members has been developed from the findings that, firstly, the resistance to oxidation can be remarkably improved by increasing the Cr content together with a combined addition of Al and rare earth metals. Secondly, a small amount of Co addition is effective to enhance alloy ability to withstand stress corrosion cracking in the environment to which sheathing heaters are subjected, and that the weldability of such members can be made superior by maintaining the content of Si and Ti within a specified region.

Abstract: About ten weight percent nickel is added to a Fe-base alloy which has a ferrite microstructure to improve the high temperature castability and crack resistance while about 0.2 weight percent zirconium is added for improved high temperature cyclic oxidation and corrosion resistance. The basic material is a high temperature FeCrAl heater alloy, and the addition provides a material suitable for burner rig nozzles.

Abstract: An austenitic stainless steel exhibiting improved resistance to corrosion caused by nitric acid is disclosed, which consists essentially of:C: not more than 0.03% by weight, Si: 2-6% by weight,Mn: 0.1-8% by weight, Cr: 20-35% by weight,Ni: 17-50% by weight, Mg: not more than 0.02%,at least one of Nb, Ti and Ta in the total amount of 8.times.C(%) or more, but 1.0% by weight or less,S: not more than 0.003% by weight,Oxygen: not more than 0.003% by weight,N: not more than 0.03% by weight,P: not more than 0.02% by weight,Fe and incidental impurities: balancethe composition further satisfying the following relationships;-10.ltoreq.Ni(Bal).ltoreq.-0.1Cr(%).gtoreq.(7/4)Si(%)+16.5Mg(%)-0.75.times.S(%)-1.5.times.Oxygen(%).gtoreq.0wherein, Ni(Bal)=30.times.C(%)+0.5.times.Mn(%)+Ni(%)+8.2-1.1.times.[1.5.times.Si(%) +Cr(%)].