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:
Dec. 09, 2008
Filed:
Nov. 13, 2003
Jean Beguinot, Le Creusot, FR;
Jean-georges Brisson, Le Creusot, FR;
Jean Beguinot, Le Creusot, FR;
Jean-Georges Brisson, Le Creusot, FR;
USINOR, Puteaux, FR;
Abstract
The invention concerns a method for making an abrasion-resistant steel part consisting of 0.1%≦C≦0.23%; 0%≦Si≦2%; 0%≦AI≦2%; 0.5%≦Si+AI≦2%; 0%≦Mn≦2.5%; 0%≦Ni≦5%; 0%≦Cr≦5%; 0%≦Mo≦1%; 0%≦W≦2%; 0.05%≦Mo+W/2≦1%; 0%≦B≦0.02%; 0%≦Ti≦0.67%; 0%≦Zr≦1.34%; 0.05%≦Ti+Zr/2≦0.67%; 0%≦S≦0.15%; N<0.030, optionally 0% to 1.5% of Cu; optionally Nb, Ta and V such that Nb/2+Ta/4+V≦0.5 %; optionally Se, Te, Ca, Bi, Pb contents ≦0.1%; the rest being iron and impurities. Additionally: 0.095%≦C*=C−Ti/4−Zr/8+7×N/8, Ti+Zr/2−7×N/2≦0.05% and 1.05×Mn+0.54×Ni+0.5O×Cr+0.3×(Mo++W1/2)+K>1.8, with K=1 if B≧0.0005% and K=0 if B<0.0005%. After austenitization, the method consists in: cooling at a speed >0.5° C./s between ACand T=800−270×C*−90×Mn−37×Ni−70×Cr−83×(Mo+W/2) and about T−50° C.; then cooling at a speed 0.1<Vr<150×epbetween T and 100° C., (ep=thickness of plate in mm); cooling down to room temperature and optionally planishing. The invention also concerns the resulting plate.