M-2 is a high speed tungsten-molybdenum tool steel. The carbides are small and evenly distributed. It has high wear resistance. After heat treatment, its hardness is the same as T-1, but its bending strength can reach 4700 Mpa, and its toughness and thermoplasticity are higher than T-1 by 50%. It is usually used to manufacture a variety of tools, such as drill bits, taps and reamers. Its decarbonization sensitivity is a little bit high.
M-2 is a high speed tungsten-molybdenum tool steel. The carbides are small and evenly distributed. It has high wear resistance. After heat treatment, its hardness is the same as T-1, but its bending strength can reach 4700 Mpa, and its toughness and thermoplasticity are higher than T-1 by 50%. It is usually used to manufacture a variety of tools, such as drill bits, taps and reamers. Its decarbonization sensitivity is a little bit high.
| C | CO | CR | MN | MO | NI | P | S | SI | V | W |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.78 – 1.05 | 3.75 – 4.50 | 0.15 – 0.40 | 4.50 – 5.50 | 0.30 Max. | 0.03 Max. | 0.03 Max. | 0.20 – 0.45 | 1.75 – 2.20 | 5.50 – 6.75 |
Flats • Hollowbar • Metric • Non-Standard • Rounds • Squares • Standard
| Blanking Dies | Boring Tools | Broaches |
| Center Drills | Gear Cutters | Lamination Dies |
| Lathe Tools | Mandrels | Milling Cutters |
| Planer Tools | Punches | Reamers |
| Router Bits | Shear Blades | Taps |
| Thread Chasers | Twist Drills | Wood Knives |
AISI M2 High Speed Steel-US
AFNOR 06-05-04-02-France
DIN 1.3343-Germany
UNI KU-Italy
JIS SKH9-Japan
SS 2722-Sweden
B.S. BM 2-United Kingdom
ASTM A600-US
FED QQ-T-590-US
SAE J437-US
SAE J438-US
UNS T11302-US
| Treatment | Temperature Range | Cooling/Quenching | Notes |
|---|---|---|---|
| Forging | 1975-2075° 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 | 2225-2275° F (furnace) 2200-2225° 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 2275° F. For maximum toughness and high hardness, harden at 2200° F. |
| Tempering | (See Chart) | Double tempering is required. The usual tempering time is 2+2 hours. Recommended temperature is 1000-1075° F. |