Patent ID: 8361254

Claim:
A method of forming a composite plate of maraging steel, the method comprising: depositing a layer comprising a first maraging steel powder onto a surface of a slab comprising a second maraging steel; the first maraging steel having a hardness value ranging from 58 to 64 RC, a tensile strength of at least 350 ksi, and a composition comprising, by weight, 15.0% to 20.0% Ni, 2.0% to 6.0% Mo, 3.0% to 8.0% Ti, up to 0.5% Al, up to 0.5% Co, the balance Fe and residual impurities; and the second maraging steel having a hardness value ranging from 48 to 54 RC and a composition comprising, by weight, 15.0% to 20.0% Ni, 2.0% to 6.0% Mo, 1.0% to 3.0% Ti, up to 0.5% Al, the balance Fe and residual impurities; hot isostatic pressing the deposited layer comprising the first maraging steel powder onto the slab comprising the second maraging steel to form an intermediate composite slab; and roll-bonding the intermediate composite slab to form the composite plate.