8Cr4Mo4V
Other8Cr4Mo4V
High-nitrogen stainless bearing steel with improved corrosion resistance.
Chemical Composition (%)
| C | 0.75 |
|---|---|
| SI | 0.6 |
| MN | 0.5 |
| CR | 3.75 |
| MO | 3.75 |
| V | 0.9 |
| P | 0.02 |
| S | 0.01 |
Mechanical Properties
Hardness(annealed):≤248 HB;Hardness(hardened):60-64 HRC
Equivalent Standards
M50 Modification (N-bearing)
Equivalent Grades
8Cr4Mo4V
Applications
Medical/dental bearings, high-corrosion environment
Available Forms
Bar
Uses
Tool and die steel for cutting, forming, punching and molding tools. Tungsten/molybdenum (≈0%/4.125%) 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.
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