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:
Sep. 14, 2010
Filed:
May. 12, 2005
Jean Beguinot, Le Creusot, FR;
Dominique Viale, Marmagne, FR;
Jean Beguinot, Le Creusot, FR;
Dominique Viale, Marmagne, FR;
Industeel Creusot, Puteaux, FR;
Abstract
Method for reducing the segregated seams of a steel which has high mechanical strength and high wear resistance and whose composition comprises by weight: 0.30%≦C≦1.42%; 0.05%≦Si≦1.5%; Mn≦1.95%; Ni≦2.9%; 1.1%≦Cr≦7.9%; 0.61%≦Mo≦4.4%; optionally V≦1.45%, Nb≦1.45%, Ta≦1.45% and V+Nb/2+Ta/4≦1.45% ; less than 0.1% of boron, less than 0.19% of (S+Se/2+Te/4), less than 0.01% of calcium, less than 0.5% of rare earths, less than 1% of aluminum, less than 1% of copper; the balance being iron and impurities resulting from the production operation. The composition further complies with: 800≦D≦1150 with D=540(C)+245 (Mo+3 V+1.5 Nb+0.75 Ta)+125 Cr+15.8 Mn+7.4 Ni+18 Si. According to the method, the molybdenum is completely or partially replaced with double the proportion of tungsten so that W>0.21%, and Ti, Zr, C are adjusted so that, after adjustment, Ti+Zr/2≧0.2 W, (Ti+Zr/2)×C≧0.07, Ti+Zr/2≦1.49% and D is unchanged at approximately 5%. Steel obtained and method for producing a steel workpiece.