The structure factor XWrelT is used to describe the influence of the microstructure on the scuffing load capacity.
| Material |
XWrelT |
| Austenitic steels |
0,45 |
| Case-hardening steels with above average retained austenite content |
0,85 |
| Case-hardened steels with 20-30% retained austenite content |
1,0 |
| Case-hardening steels with below average retained austenite content |
1,15 |
| Phosphated steels |
1,25 |
| Nitrided or nitrocarburized steels (either pinion or wheel) |
1,25 |
| Nitrided or nitrocarburized steels (pinion and wheel) |
1,5 |
| Copper-plated gears |
1,5 |
| Quenched and tempered steels (default) |
1,0 |