Patent ID: 6860948

Claim:
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 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 with 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.