Patent ID: 8092620

Claim:
An austenitic TRIP steel consisting essentially of, in weight %, 0.14 to 0.18% Al, 2.8 to 3.2% Ti, 23.5 to 23.8% Ni, 3.8 to 4.2% Cr, 1.1 to 1.3% Mo, 0.29 to 0.31% V, 0.01 to 0.015% B. 0.01 to 0.02% C, and balance Fe and incidental impurities and which is aged to have an austenitic matrix and gamma prime precipitates in the austenitic matrix and a uniaxial tension M s σ temperature in the range of about 5 degrees C. to 40 degrees C. after aging to provide improved room temperature ductility in tension and shear including under high strain-rate adiabatic conditions.