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High-
Speed Steels
M-2, M-4pm, M42 & T-15 PM grades are available upon
request, Just call our sales dept with your requirements.
Below are some technical properties & facts about M-2, For
technical information on M-4PM, M-42 & T-15 choose the appropriate grade to the left.
 | M-2 is a tungsten-molybdenum high speed steel. M-2 is
widely used in applications requiring a high degree of toughness, grindability, good wear
resistance and high hardness. Typical analysis is shown in the chart below:
| Carbon |
Tungsten |
Vanadium |
Chromium |
Molybdenum |
| 0.85% |
6.35% |
1.9% |
4.15% |
5.0% |
|
| Heat Treatment:
 | Forging:
 | Preheat slowly to 1600º F until piece is thoroughly
heated through, then increase heat to 1950ºF - 2050ºF. |
| DO NOT hot work M-2 below 1700ºF. |
| After forging, allow M-2 to cool slowly, packed in
lime or other insulating material. (For large forgings, let soak in large furnace at
1450ºF, then cool in furnace.) |
| Anneal as soon as possible. |
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| Annealing
| Surface protection - Anneal in controlled atmosphere
furnace or pack in an inert material. |
| Slowly heat M-2 to 1550º - 1600º. Cool slowly at a
rate of 20ºF/hr until furnace is black. Shut down furnace, allow to cool normally.
Annealed hardness range is 200 - 240 Brinell. |
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| Stress-relieving:
| Temperature 1100ºF - 1290ºF. Rough machine after
stress relieving. Hold tool for 2 hours after reaching full temperature. Cool in furnace
to 930ºF and then air-cool. |
|
| Hardening:
| For best results, harden M-2 in salt baths or
controlled atmosphere furnaces. |
| Pre-heat slowly to 1450ºF - 1550ºF, and ensure equal
temperature throughout the piece. |
| Transfer piece to high-temp bath or furnace. |
| Hold steel at temperature depending on M-2 use:
| Single-edge cutting tools: 2175ºF - 2225ºF (salt
bath) |
| 2200ºF - 2250ºF (furnace) |
| Rotating multi-edge cutting tools: 2150ºF - 2200ºF |
| Punches, dies, etc: 1920ºF - 2100ºF |
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| Tempering:
| Temper immediately when piece reaches 150ºF or when
comfortably hand-held |
| Tempering temperature should be in the range of
1025ºF - 1100ºF. |
| Heat slowly to temperature, hold tools at heat for 2
hours before air cooling. |
| For best toughness, after tool has cooled, retemper
for 2 additional hours at slightly lower temperature. |
|
| Physical & Mechanical
Properties (approx.):
| Density, lb. per cu in: .294 |
| Specific gravity 8.15 |
| Critical points:
| Heating (Ac) 400º/hr - begins 1530ºF; ends 1618ºF |
| Cooling (Ar) 30º/hr - begins 1430ºF; ends
1380ºF |
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