M50NiL
OtherM50NiL
Carburizing version of M50. Case hardened for high surface durability, tough core.
Chemical Composition (%)
| C | 0.11 |
|---|---|
| NI | 0.55 |
| SI | 0.25 |
| MN | 0.6 |
| CR | 3.75 |
| MO | 4 |
| V | 1.1 |
| P | 0.01 |
| S | 0.01 |
Mechanical Properties
Surface Hardness:≥60 HRC;Core Tensile:≥1210 MPa
Chinese Standard
AMS 6278 M50NiL
Equivalent Standards
M50 NiL / CBS 1000
Applications
Aerospace gearbox bearings, advanced engine mainshaft bearings
Available Forms
Bar,Forging
Uses
Tool and die steel for cutting, forming, punching and molding tools. Tungsten/molybdenum (≈0%/4.25%) give hot hardness and red-hardness for high-speed and hot-work tools. High chromium (≈4%) provides wear resistance and secondary hardening. Applied to blanks, punches, extrusion dies, shear blades, plastic-mold and cold-work tooling.
Heat Treatment
Powder/HSS: preheat 800–850 °C, austenitize 1180–1230 °C (salt or vacuum), quench, triple temper 540–570 °C to ≈64–66 HRC.
Precautions
Risk of quench cracking and distortion — use graded preheating, controlled cooling and multiple tempers. Avoid overheating the austenitizing temperature. Machine in the soft annealed condition; allow for dimensional change after heat treatment. Grind with coolant to prevent rehardening cracks.
Comments 0