Golf club head used in golf club manufacture is made from a rust-free age-hardened maraging steel containing alloying additions of nickel, chromium, titanium, beryllium

摘要

Golf club head is made from a rust-free age-hardened maraging steel having a martensitic temperature MS of at least 130 degrees C and a ferrite content of less than 3 %. The maraging steel contains (in weight %) 6.0-9.0 nickel, 11.0-15.0 chromium, 0.1-0.3 titanium, 0.2-0.3 beryllium, and a balance of iron. The steel has a tensile strength of more than 2000 MPa and a creep limit of more than 1900 MPa. An Independent claim is also included for a process for the production of a maraging steel for a golf club head comprising melting a maraging steel alloy and casting to form a cast block, hot deforming the block to form a green body, solution annealing, cooling, grinding to remove beryllium-deficient edge zones, cold deforming, and heat treating.