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US 6,786,980 B2Granted
Steel product and method for manufacturing
AssigneeCargill, Incorporated
InventorsWilliam Joseph Peppler, Brett Michael Jackson
Life of this patent
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Abstract
A method for providing a steel product having a surface hardness of between about 360 Bhn and 420 Bhn is provided. The method includes steps of providing a steel product from a steel product comprising at least about 96 wt. % iron and between about 0.24 wt. % and about 0.30 wt. % carbon, heating the steel product to at least its austentizing temperature, quenching to below its martinsite finish temperature, and tempering the steel product at a temperature of at least about 800° F. Steel products prepared by this method are described.
Claims22
A method comprising steps of:
- (a) providing a steel product comprising at least about 96 wt. % iron between about 0.20 wt. % and about 0.30 wt. % carbon, and nickel, if present at all, no greater than 0.25 wt. %
- (b) heating the steel product to at least its austentizing point;
- (c) quenching the steel product to temperature below its martensite finish temperature;
- and
- (d) tempering the steel product at a temperature of at least about 8500° F. to provide a hardened steel product having a surface hardness of greater than about 360 Bhn.
2 more elements
A steel product comprising:
- (i) at least about 96 wt. % iron;
- (ii) between about 0.24 wt. % and about 0.30 wt. % carbon;
- (iii) nickel, if present at all, less than 0.25 wt. %;
- wherein
- (iv) the steel product has a Brinell hardness according to ASTM A370 of greater than 360 Bhn;
- and
- (v) an elongation according to ASTM A 370 of at least about 8 percent at a two inch gauge.
4 more elements
Dependencies are inferred from the claim text.