The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 2017
Filed:
May. 16, 2012
Jens-ulrik Becker, Duisburg, DE;
Jian Bian, Cologne, DE;
Thomas Heller, Duisburg, DE;
Rudolf Schoenenberg, Daphne, AL (US);
Richard G. Thiessen, Malden, NL;
Sabine Zeizinger, Mulheim, DE;
Thomas Rieger, Düsseldorf, DE;
Oliver Bulters, Ochtrup, DE;
Jens-Ulrik Becker, Duisburg, DE;
Jian Bian, Cologne, DE;
Thomas Heller, Duisburg, DE;
Rudolf Schoenenberg, Daphne, AL (US);
Richard G. Thiessen, Malden, NL;
Sabine Zeizinger, Mulheim, DE;
Thomas Rieger, Düsseldorf, DE;
Oliver Bulters, Ochtrup, DE;
ThyssenKrupp Steel Europe AG, Duisburg, DE;
Abstract
A flat steel product having a tensile strength of at least 1200 MPa and consists of steel containing (wt %) C: 0.10-0.50%, Si: 0.1-2.5%, Mn: 1.0-3.5%, Al: up to 2.5%, P: up to 0.020%, S: up to 0.003%, N: up to 0.02%, and optionally one or more of the elements 'Cr, Mo, V, Ti, Nb, B and Ca' in the quantities: Cr: 0.1-0.5%, Mo: 0.1-0.3%, V: 0.01-0.1%, Ti: 0.001-0.15%, Nb: 0.02-0.05%, wherein Σ(V, Ti, Nb)≦0.2% for the sum of the quantities of V, Ti and Nb, B: 0.0005-0.005%, and Ca: up to 0.01% in addition to Fe and unavoidable impurities. The flat steel product has a microstructure with (in surface percent) less than 5% ferrite, less than 10% bainite, 5-70% untempered martensite, 5-30% residual austenite, and 25-80% tempered martensite, at least 99% of the iron carbide contained in the tempered martensite having a size of less than 500 nm.