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:
Nov. 16, 2004
Filed:
Nov. 15, 2001
Odd Sandberg, Uddeholm, SE;
Leif Westin, Söderfors, SE;
Other;
Abstract
A powder metallurgy manufactured high speed steel with a high content of nitrogen in the form of a body formed through consolidation of alloyed metal power has the chemical composition in weight-% ; 1-25 C, 1-3.5 N, 0.05-1.7 Mn, 0.05-1.2 Si, 3-6 Cr, 2-5 Mo, 0.05-5W, 6.2-1.7 (V+2 Nb), balance iron and unavoidable impurities in normal amounts, wherein the amount of, on one hand, the carbon equivalent, Ceq, expressed as formula (I), and, on the other hand, the vanadium equivalent, Veq, expressed as Veq=V+2 Nb, are balanced relative to each other such that the amounts of said elements, express in term of said equivalent, will lie within the area A -B -C -D -A in the system of co-ordinates in the figure, in which the Ceq/Veq-co-ordinates of the points A -D are A : 4.5/17; B : 5.5/17; C : 2.5/6.2; D ; 1.5/6.2. The structure of the steel in the hardened and tempered condition, contains 12-40 vol-% of hard matter consisting of particles of MX-type, which are evenly distributed in the matrix of the steel, where M in said hard matter of MX-type essentially consists of vanadium and/or niobium, and X consists of 30-50 weight-% carbon and 50-70 weight-% nitrogen.