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Title:
STEEL WITH HIGH MECHANICAL STRENGTH AND WEAR RESISTANCE
Document Type and Number:
WIPO Patent Application WO2005123975
Kind Code:
A3
Abstract:
The invention relates to a steel with high mechanical strength and wear resistance. More specifically, the invention relates to a method of reducing the segregated veins of a steel having high mechanical strength, high wear resistance and the following weight composition: 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 % borium, 0.19 % (S + Se/2 + Te/4), 0.01 % calcium, 0.5 % rare earths, 1 % aluminium, 1 % copper; the remainder being iron and impurities resulting from the production thereof. The composition also comprises: 800 = D = 1150, where D = 540(C)0.25 + 245 (Mo + 3 V + 1.5 Nb + 0.75 Ta)0.30 + 125 Cr0.20 + 15.8 Mn + 7.4 Ni + 18 Si. According to the invention, all or part of the molydenum is replaced by a double proportion of tungsten, such that W > 0.21 %, and Ti, Zr, C are adjusted so that, after said adjustment, Ti + Zr/2 = 0.2 W, (Ti + Zr/2) X C = 0.07, Ti + Zr/2 = 1.49 % and D is unchanged at 5 %. The invention also relates to the steel obtained and to a method of producing a steel part.

Inventors:
BEGUINOT JEAN (FR)
VIALE DOMINIQUE (FR)
Application Number:
PCT/FR2005/001191
Publication Date:
December 21, 2006
Filing Date:
May 12, 2005
Export Citation:
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Assignee:
INDUSTEEL CREUSOT (FR)
BEGUINOT JEAN (FR)
VIALE DOMINIQUE (FR)
International Classes:
C22C38/44; C21D8/00; C22C38/46; C22C38/50; C21D6/00; C21D7/13
Foreign References:
US20030066577A12003-04-10
EP0805220A11997-11-05
US4729872A1988-03-08
US20020112786A12002-08-22
DE1273202B1968-07-18
Other References:
PATENT ABSTRACTS OF JAPAN vol. 017, no. 499 (C - 1109) 9 September 1993 (1993-09-09)
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 03 31 March 1999 (1999-03-31)
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 22 9 March 2001 (2001-03-09)
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 15 6 April 2001 (2001-04-06)
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 14 5 March 2001 (2001-03-05)
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 02 29 February 2000 (2000-02-29)
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 21 3 August 2001 (2001-08-03)
PATENT ABSTRACTS OF JAPAN vol. 016, no. 190 (C - 0937) 8 May 1992 (1992-05-08)
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