Steel having an austenitic structure, and use of such a steel for applications in the oral cavity of a human or an animal

A steel having 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, consisting of, in % by mass,

• C:
• >0.2-0.8%,
• N:
• 0.97-1.3%,
• Si:
• <2.0%,
• Mn:
• 14-30%,
• Cr:
• >20-27%,
• Mo:
• 0-6%,
• W:
• 0-6%,
• Nb:
• 0-6%,
• Ga:
• 0-6%,
• Ta:
• 0-6%, and
• the remainder being iron and unavoidable impurities, wherein the total content of unavoidable impurities is less than 0.5%, Ni as an impurity is less than 0.1% and Co as an impurity is less than 0.1%,
• wherein a coefficient of thermal expansion (CTE) of the steel in the temperature range from room temperature to 400° C. is less than or equal to 25×10−6/K,
• wherein the content of at least one element selected from the group consisting of Nb, Mo, W, Ga, and Ta is at least 0.5% by mass, and
• wherein the sum of the contents of Nb, Mo, W, Ga, and Ta is not more than 10% by mass.