M-4, like M-2, is a high speed molybdenum tool steel but with a high vanadium content as well to improve wear resistance and toughness.
M-4, like M-2, is a high speed molybdenum tool steel but with a high vanadium content as well to improve wear resistance and toughness.
| C | CO | CR | MN | MO | NI | P | S | SI | V | W |
|---|---|---|---|---|---|---|---|---|---|---|
| 1.25 – 0.14 | 3.75 – 4.75 | 0.15 – 0.40 | 4.25 – 5.50 | 0.20 – 0.45 | 3.75 – 4.50 | 5.25 – 6.50 |
Flats • Hollowbar • Metric • Non-Standard • Rounds • Squares • Standard
| Broaches | Burnishing Rolls | Cutoff Tools |
| Forming Rolls | Forming Tools | Lathe Tools |
| Milling Cutters | Planer Tools | Punches |
| Reamers | Roll Turning Tools | Twist Drills |
AISI M4 High Speed Steel-US
ASTM A600-US
FED QQ-T-590-US
SAE J437-US
SAE J438-US
UNS T11304-US
| Treatment | Temperature Range | Cooling/Quenching | Notes |
|---|---|---|---|
| Forging | 1900-2000° F | Slow. | Do not forge below 1700° F. Anneal after forging. |
| Annealing | 1550-1600° F | Cool slowly at a rate of 35° F per hour to 1000° F. | For best results, insulating media is desirable. Hold at temperature for 2 hours. |
| Stress Relieving | 1100-1300° F | Cool slowly | Stress relieve after rough machining |
| Preheating | 1500-1550° F | Preheat time in furnace is ¾ Hr. per inch of thickness. Heating up to temperature as slow as possible. | |
| Hardening | 2150-2250° F (furnace) 2150-2225° F (salt bath) | Quench in air or warm oil. To minimize quenching strains, quench in salt at 1000° F | For maximum wear resistance, harden at 2250° F. For maximum toughness and high hardness, harden at 2150° F. |
| Tempering | (See Chart) | Double tempering is recommended. The usual tempering time is 2+2 hours. Recommended temperature is 1000-1150° F. |