Cast shaped article made from high strength, precipitation-hardenable stainless steel and a process for making same
OwnerJames W. Martininventor
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Abstract
A shaped article which is manufactured by casting in air or under inert-gas shrouding at atmospheric pressure is disclosed. The shaped article provides a superior combination of high strength, hardness, ductility, and corrosion resistance compared to the known air-castable stainless steels. A cast article in accordance with this invention is made from a high strength, castable, stainless steel alloy having the following weight percent composition. 1 C 0.1 max. Mn 2 max. Si 1 max. P 0.05 max. S 0.05 max. Cr 9-13 Ni 4-8 Mo 4-8 Co 8-16 N 0.1 max. The balance of the alloy is essentially iron and the usual impurities. A process for making such an article is also described.
Claims22
A cast, shaped article that is made from a high strength, precipitation-hardenable stainless steel alloy consisting essentially of, in weight percent, about
- 8 C 0.1 max. Mn 2 max. Si 1 max. P 0.05 max. S 0.05 max. Cr 9-13 Ni 4-8 Mo 4-8 Co 8-16 N 0.1 max.
- the balance being essentially iron and the usual impurities.
A process for making a shaped article, comprising the steps of:
- melting a stainless steel alloy having the following composition in weight percent
- 11 C 0.1 max. Mn 2 max. Si 1 max. P 0.05 max. S 0.05 max. Cr 9-13 Ni 4-8 Mo 4-8 Co 8-16 N 0.1 max.
- the balance being essentially iron and the usual impurities;
- casting the molten alloy into a mold to form a cast article;
- allowing the cast article to solidify;
- and then
- heat treating the cast article to age harden the cast article.
A golf club head made from a high strength, precipitation-hardenable stainless steel alloy consisting essentially of, in weight percent, about
- 12 C 0.1 max. Mn 2 max. Si 1 max. P 0.05 max. S 0.05 max. Cr 9-13 Ni 4-8 Mo 4-8 Co 8-16 N 0.1 max.
- the balance being essentially iron and the usual impurities,
- said golf club head having been formed by casting said alloy into a mold, solidifying the alloy, and then heat treating the alloy under conditions of temperature and time sufficient to provide a yield strength of at least about 220 ksi for said golf club head.
Dependencies are inferred from the claim text.