The
MTU 652 Exhaust valve seat has below information:
1. Material: X40CrSiMo10-2(1.4731) or X45CrSi9-3(1.4718), comply with European standard BS EN10090.
2. Stress released completely.
3. Seat face concentric to O/D within 0.02mm TIR.
4. O/D roundness within 0.01mm.
5. Seat face roundness within 0.01mm
6. Proven Reliability By European and China Customers.