Patent ID: 8017071

Claim:
A corrosion resistant, martensitic steel alloy consisting essentially of, in weight percent, about Carbon 0.10-0.40 Manganese 0.01-0.3 Silicon 1.0 max Phosphorus 0.2 max Chromium 10-15 Nickel 0.25 max Molybdenum 0.75-4.0 Nitrogen 0.02-0.15 Copper 1.75-3.0 Titanium 0.01 max Aluminum 0.01 max Niobium + Tantalum 0.10 max Vanadium 0.20 max Zirconium less than 0.001 Calcium less than 0.001, 0.007-0.030% of sulfur, selenium, or a combination thereof, and the balance is essentially iron, wherein Ni/Cu is not more than about 0.10.