Patent ID: 8747574

Claim:
A maraging steel strip produced by nitriding a maraging steel comprising, by mass %, C: 0.01% or less, Si: 0.1% or less, Mn: 0.1% or less, P: 0.01% or less, S: 0.005% or less, Ni: 8.0 to 22.0%, Cr: 0.1 to 8.0%, Mo: 2.0 to 10.0%, Co: 2.0% to 20.0%, Ti: 0.1% or less, Al: 2.5% or less, N: 0.03% or less, O: 0.005% or less, and the balance being Fe and unavoidable impurities, wherein the steel comprises a nitrided layer on a surface of the steel, the nitrided layer comprising Cr nitride precipitated in the nitrided layer and matrix martensite, and wherein the Cr nitride and the matrix martensite satisfy Baker-Nutting orientation relationship with an orientation difference within 10°.