초록 ▼

A nickel-chromium-molybdenum alloy capable of being age hardened for improved strength while maintaining high corrosion resistance contains in weight percent 19.5 to 22 chromium, 15 to 17.5 molybdenum, up to 3 iron, up to 1.5 manganese, up to 0.5 aluminum, up to 0.02 carbon, up to 0.015 boron, up to

A nickel-chromium-molybdenum alloy capable of being age hardened for improved strength while maintaining high corrosion resistance contains in weight percent 19.5 to 22 chromium, 15 to 17.5 molybdenum, up to 3 iron, up to 1.5 manganese, up to 0.5 aluminum, up to 0.02 carbon, up to 0.015 boron, up to 0.5 silicon, up to 1.5 tungsten and up to 0.5 of each of hafnium, tantalum and zirconium, with a balance of nickel and impurities. Certain alloying elements must be present in amounts according to an equation here disclosed.

대표청구항 ▼

1. A nickel-chromium-molybdenum alloy capable of being age hardened for improved strength while maintaining high corrosion resistance, having a composition comprised in weight percent of:19.5 to 22chromium15 to 17.5molybdenumup to 3ironup to 1.5manganeseup to 0.5aluminumup to 0.02carbonup to 0.015bo

1. A nickel-chromium-molybdenum alloy capable of being age hardened for improved strength while maintaining high corrosion resistance, having a composition comprised in weight percent of:19.5 to 22chromium15 to 17.5molybdenumup to 3ironup to 1.5manganeseup to 0.5aluminumup to 0.02carbonup to 0.015boronup to 0.5siliconup to 1.5tungstenwith a balance of nickel and impurities, metallic impurities hafnium, tantalum and zirconium each up to 0.5 wt. %, wherein the alloy has a P value of from 33.5 to 35.9, P being defined as:P=2.64Al+0.19Co+0.83Cr?0.16Cu+0.39Fe+0.52Hf+0.59Mn+1.0Mo+0.68Nb+2.15Si+1.06V+0.39W+0.45Ta+1.35Ti+0.81Zr where the elemental compositions are given in weight percent.2. The nickel-chromium-molybdenum alloy of claim 1, also comprising in weight percent:up to 2.5cobaltup to 1.25niobiumup to 0.7titaniumup to 0.2vanadium.3. The nickel-chromium-molybdenum alloy of claim 1, comprising up to 3.5 wt. % copper.4. The nickel-chromium-molybdenum alloy of claim 1, wherein the impurities comprise levels of at least one of sulfur, phosphorus, oxygen, nitrogen, magnesium, and calcium.5. The nickel-chromium-molybdenum alloy of claim 1, wherein the alloy is in a wrought form selected from the group consisting of sheets, plates, bars, wires, tubes, pipes, and forgings.6. The nickel-chromium-molybdenum alloy of claim 1, wherein the alloy is in cast form.7. The nickel-chromium-molybdenum alloy of claim 1, wherein the alloy has been spray-formed.8. The nickel-chromium-molybdenum alloy of claim 1, wherein the alloy is in powder metallurgy form.9. A nickel-chromium-molybdenum alloy capable of being age hardened for improved strength while maintaining high corrosion resistance, having a composition comprised in weight percent of:19.9 to 21.4chromium15.1 to 17.4molybdenumup to 2iron0.1 to 0.4manganese0.1 to 0.4aluminumup to 0.01carbonup to 0.008boronup to 0.1siliconup to 1.0tungstenwith a balance of nickel and impurities, metallic impurities hafnium, tantalum and zirconium each up to 0.2 wt. %, wherein the alloy has a P value of from 34.0 to 35.9, P being defined as:P=2.64Al+0.19Co+0.83Cr?0.16Cu+0.39Fe+0.52Hf+0.59Mn+1.0Mo+0.68Nb+2.15Si+1.06V+0.39W+0.45Ta+1.35Ti+0.81Zr where the elemental compositions are given in weight percent.10. The nickel-chromium-molybdenum alloy of claim 9, also comprising in weight percent:up to 1cobaltup to 0.2niobiumup to 0.2titaniumup to 0.2vanadium.11. The nickel-chromium-molybdenum alloy of claim 9, also comprising up to 0.5 wt. % copper.12. A nickel-chromium-molybdenum alloy capable of being age hardened for improved strength while maintaining excellent corrosion resistance, having a composition comprised in weight percent of:19.92 to 21.41chromium15.11 to 17.38molybdenumfrom 0.94 to 2.76ironfrom 0.29 to 1.18manganesefrom 0.11 to 0.21aluminumfrom 0.003 to 0.011carbonup to 0.003boronup to 0.07siliconfrom 0.09 to 1.06tungstenfrom 0.04 to 2.29cobaltfrom 0.01 to 1.19niobiumup to 0.46titaniumup to 0.16vanadiumup to 0.02tantalumwith a balance of nickel and impurities, metallic impurities hafnium and zirconium each up to 0.5 wt. %, wherein the alloy has a P value of from 33.7 to 35.9, P being defined as:P=2.64Al+0.19Co+0.83Cr?0.16Cu+0.39Fe+0.52Hf+0.59Mn+1.0Mo+0.68Nb+2.15Si+1.06V+0.39W+0.45Ta+1.35Ti+0.81Zr where the elemental compositions are given in weight percent.13. The nickel-chromium-molybdenum alloy of claim 12, also comprising 0.01 to 0.05 wt. % copper.14. The nickel-chromium-molybdenum alloy of claim 13, wherein the impurities comprise levels of at least one of sulfur, phosphorus, oxygen, nitrogen, magnesium, and calcium.15. The nickel-chromium-molybdenum alloy of claim 13, wherein the alloy is in a wrought form selected from the group consisting of sheets, plates, bars, wires, tubes pipes, and forgings.16. The nickel-chromium-molybdenum alloy of claim 13, wherein the alloy is in cast form.17. The nickel-chromium-molybdenum alloy of claim 13, wherein the alloy has been spray-formed.18. The nickel-chromium-molybdenum alloy of claim 13, wherein the alloy is in powder metallurgy form.