Steel sheet for automobiles having excellent impact resistance and method of manufacturing the steel sheet
Patent 5558727 Issued on September 24, 1996. Estimated Expiration Date: 
February 23, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 23, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod for producing hot-rolled dual-phase high-tensile steel sheets Method of manufacturing T-3 grade low temper black plates Hot-rolled strip having a dual-phase structure Patent #: 4790889 InventorsAssigneeApplicationNo. 393445 filed on 02/23/1995US Classes:148/333, Chromium containing, but less than 9 percent148/603, With working at or below 120`C or unspecified cold working148/651Heating step follows cold workingExaminersPrimary: Yee, DeborahAttorney, Agent or FirmForeign Patent References
International ClassesC21D 008/02C22C 038/18 Foreign Application Priority Data1994-12-26 JPAbstractA high strength steel sheet for automobiles which exhibits excellent press-formability strength against impact resistance at a high strain rate is hot rolled under specific conditions, or is cold rolled from hot rolled sheet which is prepared under conventional conditions, with the cold rolled steel being annealed under specific conditions. The steel sheet comprises 0.010-0.10 wt % of C, not greater than 1.50 wt % of Si, 0.50-3.00 wt % of Mn, not greater than 0.010 wt % of S and 0.01-0.1 wt % of Al, and one kind or two kinds selected from 0.05-0.15 wt % of P and 0.5-1.5 wt % of Cr, and the balance being Fe and inevitable impurities and having a structure mainly composed of 2-30 vol % of martensite phase and a ferrite phase containing a solution C not greater than 0.0010 wt %.Other References
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