Rolling bearing component
A rolling bearing component ( 2, 3, 4 ) has the following features: a nitrided surface zone ( 5 ), with a nitrogen content decreasing from the outside inwards, and a core zone ( 6 ), internal compressive stresses decreasing from the outside inwards in the surface zone ( 5 ), a surface hardness of 870 to 2000 HV 0.3 at a depth of 0.04 mm, wherein—the hardness at a depth of 0.3 mm is not more than 250 HV 0.3 less than the surface hardness.
1. A rolling bearing component comprising:
a nitrided surface zone having a nitrogen content decreasing from the outside to the inside;
a core zone;
an absolute value of residual compressive stresses in the surface zone decreasing from the outside to the inside;
a hardness of 870 HV 0.3 to 1,000 HV 0.3 at a depth of 0.04 mm, the hardness at a depth of 0.3 mm being at most 250 HV 0.3 less than at a depth of 0.04 mm;
wherein the hardness at a depth of 0.3 mm, indicated in HV 0.3, is more than 75% of the hardness at a depth of 0.04 mm;
wherein the absolute value of the residual compressive stress on the surface is at least 500 MPa and at most 1,000 MPa;
wherein the absolute value of the residual compressive stress at a depth of 0.05 mm is less than 60% of the absolute value of the residual compressive stress on the surface.
2. The rolling bearing component as recited in claim 1 wherein the depth at which the nitrogen content in the surface zone falls below 80% of a maximum value corresponds to at least 1.75 times the depth at which the residual compressive stress is 80% of the maximum residual compressive stress.
3. The rolling bearing component as recited in claim 2 wherein the depth at which the nitrogen content in the surface zone falls below 80% of the maximum value corresponds to at most eight times the depth at which the residual compressive stress is 80% of the maximum residual compressive stress.
4. A bearing ring comprising the rolling bearing component as recited in claim 1 .
5. A rolling body comprising the rolling bearing component as recited in claim 1 .
6. A rolling bearing comprising the rolling bearing component as recited in claim 1 .
7. The roller bearing component as recited in claim 1 wherein the absolute value of the residual compressive stress at a depth of 0.05 mm is less than half of the absolute value of the residual compressive stress on the surface.
8. A rolling bearing component comprising:
a nitrided surface zone having a nitrogen content decreasing from the outside to the inside;
a core zone;
an absolute value of residual compressive stresses continually decreasing from the surface to at least a depth of 0.1 mm; and
a hardness of 870 HV 0.3 to 1,000 HV 0.3 at a depth of 0.04 mm, the hardness at a depth of 0.3 mm being at most 250 HV 0.3 less than at a depth of 0.04 mm, wherein the absolute value of the residual compressive stress at a depth of 0.05 mm is less than 60% of the absolute value of the residual compressive stress on the surface.