M50NiL (Spec) | AMS 6278D, formerly 1.3590
| Numeric designation | AMS 6278D, früher 1.3590 |
|---|---|
| Chemical designation | M50NiL (Spec) |
| State | QT |
| Etching | V2A-Beize @ RT |
The micrographs show the quenched and tempered core structure of the rolling bearing steel M50NiL made of tempered martensite. The core hardness is 49 HRC. The edge zone is usually carburised.
Fe-Base
1.1221 | C60E +I Prior austenite grain boundaries
1.1274 | C100S +QW +T Prior austenite grain boundaries
1.1269 | C85S +QW +T Prior austenite grain boundaries
1.7076 | 32CrB4 +Q Prior austenite grain boundaries
1.1221 | C60E +QW +T Prior austenite grain boundaries
1.1191 | C45E +QW +T Prior austenite grain boundaries
1.7220 | 34CrMo4 +Q Prior austenite grain boundaries
1.7220 | 34CrMo4 +QT (12.9) Prior austenite grain boundaries
1.7076 | 32CrB4 +QT (12.9) Prior austenite grain boundaries
1.5511 | 35B2 +QT (9.8) Prior austenite grain boundaries