Aubert & Duval

Ihi Ionbond Ag.

Erasteel

Johanna André

Håkan Engqvist

Lars Hultman

Jacques Bellus

Fredrik Sandberg

Maria Pettersson

M Atman Benbahmed

Atman Benbahmed

The present invention relates to a steel composition carburizable and/or nitritable, comprising, in percentages by weight of the total composition: It further relates to the method of production thereof, the steel blank obtained and a mechanical device comprising the latter.

Steel composition

A carburisable steel alloy suitable for bearing components comprising, in percent by weight: C 0.05-0.5 wt. % Cr 2.5-5.0 wt. %, Mo 4-6 wt. %, W 2-4.5 wt. %, V 1-3 wt. %, Ni 2-4 wt. %, Co 2-8 wt. %, optionally one or more of the following elements: Nb 0-2 wt. % N 0-0.5 wt. % Si 0-0.7 wt. %, Mn 0-0.7 wt. %, Al 0-0.1 5 wt. %, wherein the combined amount of Nb+V is within the range 1-3.5 wt. %, the combined amount of C+N is within the range 0.05-0.5 wt. %, the balance being Fe and unavoidable impurities.

Steel alloy and a component comprising such a steel alloy

An implant comprises a substrate and a coating on a surface of the substrate, and the coating includes silicon nitride and has a thickness of from about 1 to about 15 micrometer wherein the silicon nitride coating has a composition defined by SiNW, where W is C, H and/or O, 2&#x3c;x&#x3c;4, 3&#x3c;y&#x3c;5, and z is such that the coating contains less than 20 atomic percent of C, H and O.

Implants with wear resistant coatings and methods

An implant comprises a substrate and a coating on a surface of the substrate, and the coating comprises silicon nitride and has a thickness of from about 1 to about 15 micrometer. A method of providing the implant comprises coating a surface of the implant substrate with the coating comprising silicon nitride and having a thickness of from about 1 to about 15 micrometer by physical vapour deposition.

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Uppsala, Sweden

Johanna André