Low alloy, high strength, age hardenable steel

Abstract

Abstract Low alloy, high strength, age hardenable steel, especially adapted for bar product applications, consisting essentially in percentage by weight of about: up to 0.06% maximum of carbon, from more than 1% up to 8% chromium, 0.25 to 3.5% nickel, 1 to 4% copper, 0.01 to 0.5% niobium, 0.2 to 2% manganese, 0.01 to 1% silicon, up to 1.5% molybdenum, up to 1.2% aluminum, up to 0.5% titanium, up to 0.1% boron, up to 0.035% phosphorous, up to 0.040% sulphur, balance iron except for impurities within commercial tolerances, characterized as hot rolled and air cooled or as thereafter solution treated at about 1,600*-2,200*F and thence air or more rapidly cooled, by room temperature hardness of about 30 Rockwell ''''C'''' and under, suitable for forming and machining, and as thereafter aged at about 700*-1,100*F, by room temperature properties as follows: tensile strengths of about 160-180 ksi, yield strengths of about 135-145 ksi, tensile elongations of about 17-20%, Rockwell ''''C'''' hardnesses of about 35-40, and Charpy impact energies of about 15-30 ft-lbs. and higher depending on the heat treatment.

Inventors

• 👤 George M Waid
• 👤 Robert T Ault

Bibliographic Details