Process for producing steel products having improved grain...

Details Process for producing steel products having improved grain... Process for producing steel products having improved grain...

2006-07-25

2006-07-25

King, Roy (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S649000, C148S328000, C148S320000, C148S319000

Reexamination Certificate

active

07081174

ABSTRACT:
Disclosed is a production process of a steel product for induction hardening and a steel product for carburizing, having improved grain size properties and machinability. This production process comprises the steps of: providing an ingot or bloom comprising a steel comprising, by weight, carbon (C): 0.10 to 0.45% or 0.25 to 0.70%, silicon (Si): 0.03 to 1.0%, manganese (Mn): 0.2 to 2.0%, titanium (Ti): 0.05 to 0.2%, aluminum (Al): 0.005 to 0.05%, and nitrogen (N): not more than 0.01% with the balance consisting of iron (Fe) and unavoidable impurities; and subjecting the steel ingot or bloom to a series of hot working steps including the step of rolling the steel ingot or bloom into a semi-finished steel product, the step of rolling the semi-finished steel product into a steel bar or wire rod, and the step of forging the steel bar or wire rod into a product. In the above series of hot working steps, the steel is given a thermal history in which said steel is at least once heated to 1,250° C. or above, is cooled to room temperature, and is then reheated to a temperature range of 800 to 1,100° C.

REFERENCES:
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patent: 6699333 (2004-03-01), Dubois
patent: 2003/0047242 (2003-03-01), Nishimori et al.
patent: 08-283910 (1996-10-01), None
patent: 11-092824 (1999-04-01), None
patent: 2000-080446 (2000-03-01), None
patent: 2001-073067 (2001-03-01), None

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