Abstract: The invention provides a nickel-free and cobalt-free, rust-proof austenitic steel, which meets the requirements, necessary in dentistry, concerning its corrosion resistance, its thermal expansion coefficient, its mechanical properties and its castability. For this purpose, the steel consists of, in % by mass, C: >0.2-0.8%, N: 0.3-1.3%, Si: ?2.0%, Mn: 14-30%, Cr: 17-27%, Mo: 0-6%, W: 0-6%, Nb: 0-6%, Ga: 0-6%, Ta 0-6%, the remainder being iron and unavoidable impurities. The content of impurities complies with the stipulations in DIN EN ISO 22674:2016-09 for dental materials. The steel composed has an austenitic structure, an offset yield strength Rp0.2 of at least 230 MPa, a percent elongation A of more than 5%, and a modulus of elasticity of at least 150 GPa.

Abstract: The invention shows possibilities which allow simplified production of implants or prostheses, specifically of dental implants or prostheses, by applying subtractive processes. For this purpose, the invention proposes the use of a precipitation-hardening or solid-solution-strengthening, biocompatible cobalt-based alloy for the production of blanks. Such blanks are provided in the soft state. Subsequently, each component (implant or prosthesis) is produced from the soft blank by means of material-removing machining. Subsequently, a heat-treatment of the implant or prosthesis then takes place to adjust the hardness thereof by means of precipitation hardening or solid-solution formation.

Abstract: The invention shows possibilities which allow simplified production of implants or prostheses, specifically of dental implants or prostheses, by applying subtractive processes. For this purpose, the invention proposes the use of a precipitation-hardening or solid-solution-strengthening, biocompatible cobalt-based alloy for the production of blanks. Such blanks are provided in the soft state. Subsequently, each component (implant or prosthesis) is produced from the soft blank by means of material-removing machining. Subsequently, a heat-treatment of the implant or prosthesis then takes place to adjust the hardness thereof by means of precipitation hardening or solid-solution formation.

Abstract: This invention relates to a steel having high wear resistance, a high degree of hardness, good corrosion resistance and/or low thermal conductivity. A hardness of a steel is at least 56 HRC in a hardened state. In order to obtain this hardness, in a microstructure of the steel in total at least 30% wt. of hard phases are present which in addition to TiC particles include further carbide particles, oxide particles or nitride particles. Content of the TiC particles in the steel is at least 20% wt. The hard-phase particles are embedded in a matrix which includes (in % wt.) 9.0-15.0% Cr, 5.0-9.0% Mo, 3.0-7.0% Ni, 6.0-11.0% Co, 0.3-1.5% Cu, 0.1-2.0% Ti, 0.1-2.0% Al, the remainder being iron and unavoidable impurities.