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 |
| 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. |
| Din Standard | Brazil | Austria | Slovania | Jis | Czech Rep. | China | American |
|---|---|---|---|---|---|---|---|
| 1.3343 | VWM2 | S600 | BRM2 | SKH51 | Max SP MO5S | W6Mo5Cr4V2 | M-2 |
| 1.3243 | VK5E | S705 | BRCMO | SKH55 | Max SP 75D | W6Mo5CrV2Co5 | M-35 |
| 1.3247 | VKM42 | S500 | BRCMO2 | SKH59 | MAXEX 42 | W2Mo9Cr4VCo8 | M-42 |
| 1.3207 | VK10E | S700 | BRU | SKH57 | RADECO M10 | - | T-42 |
| Grade | C | Si | Mn | Cr | Mo | V | W | Co | Ni | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AISI M2 | 0.86/0.94 | 0.45 max | 0.40 max | 3.80/4.50 | 4.70/5.20 | 1.70/2.00 | 6.00/6.70 | -- | -- | -- | -- |
| AISI M35 | 0.86/0.94 | 0.45 max | 0.40 max | 3.80/4.50 | 4.70/5.20 | 1.70/2.00 | 6.00/6.70 | 4.50/5.00 | -- | -- | -- |
| AISI M42 | 1.05/1.15 | 0.45 max | 0.40 max | 3.60/4.50 | 9.00/10.00 | 1.00/1.30 | 1.20/80 | 7.50/8.50 | -- | -- | -- |
| AISI MT42 | 1.25/1.40 | 0.45 max | 0.40 max | 3.75/4.50 | 3.00/4.00 | 2.75/3.25 | 9.00/10.00 | 9.50/10.50 | -- | -- | -- |
