M3-1
OtherM3-1
AISI tool steel M3-1.
Chemical Composition (%)
| C | 0.78 |
|---|---|
| SI | 0.2 |
| MN | 0.15 |
| CR | 3.75 |
| MO | 4.5 |
| W | 5.5 |
| V | 1.75 |
| P | 0.03 |
| S | 0.03 |
Mechanical Properties
Hardness(annealed):≤230 HB;Hardness(hardened):48-56 HRC
Equivalent Standards
AISI M3-1
Applications
Tools, dies, cutters
Available Forms
Round,Block
Uses
Tool and die steel for cutting, forming, punching and molding tools. Tungsten/molybdenum (≈6.125%/5%) give hot hardness and red-hardness for high-speed and hot-work tools. High chromium (≈4.125%) 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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