| Customization: | Available |
|---|---|
| Type: | Special Steel Bar |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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PM M4Elevate your work with high-speed tool steel, a versatile material renowned for its exceptional blend of high wear-resistance, impact toughness, and bend strength. This excellence is achieved through its fine grain size, minimal carbides, and unparalleled cleanliness. PM M4Experience extended cutting tool longevity with our high-speed tool steel, outperforming conventionally-wrought M1.M2, M7and other lower-alloyed high-speed steels. Our PM M4 stands out in cold work tooling applications, offering superior durability over high-carbon, high-chromium die steels such as D2 and D3.
Other Known Names:CPM REX M4 steel®, ASP 2004, S690
Ideal for Broaches, End Mills, Punches, Hobs, Fine Blanking, and Forming Dies.
Density
0.286 lb/in3 (7806 kg/m3)
Specific Gravity
7.92
Modulus Of Elasticity
31 x 106 psi (214 GPa)
Machinability
Achieves 40-45% of the machinability of 1% carbon steel.
| MAXIMUM | TYPICAL | ||||||
|---|---|---|---|---|---|---|---|
| Carbon | Chromium | Tungsten | Molybdenum | Vanadium | Cobalt | Annealed | Tempered |
| C | Cr | W | Mo | V | Co | Hb | HrC |
| 1.4 | 4 | 5.65 | 5.2 | 4 | - | 255 | 65 |
| ANNEALING | PREHEAT | AUSTENITIZING | QUENCH | TEMPERING |
|---|---|---|---|---|
| Temp | Temp | Temp | Medium | Temp |
| °F | °F | °F | °F | |
| 1550/1600 | 1500/1550 | 2175/2220 | Salt/Oil/Atm | 1025/1050 |
Rapid heating from preheat is essential.
For Cutting Tools:
For Cold Work Tooling:
To optimize toughness, use the lowest temperature. For maximum hot hardness, apply the highest temperature.
Quenching:
Use pressurized gas, warm oil, or salt.
For pressurized gas quenching, ensure a furnace with at least 4 bars of pressure. A quench rate of approximately 400°F (222°C) per minute to below 1000°F (538°C) is crucial to achieve the desired properties.
For optimal oil quenching, heat the material until it reaches a deep black, approximately 900°F (482°C). Allow it to cool in still air until it reaches a temperature range of 150-125°F (66-51°C).
When using a salt bath, maintain a consistent temperature between 1000-1100°F (538-593°C). Equalize the material in the salt, then let it cool in still air to 150-125°F (66-51°C).
Tempering:
Proceed with tempering immediately after quenching to ensure material stability.
The standard tempering temperature range is 1000-1100°F (538-593°C). Avoid tempering below 1000°F (538°C). Hold the material at the desired temperature for 2 hours before allowing it to air cool to ambient temperature. Double tempering is essential, and if the material was austenitized at 2100°F (1149°C) or higher, triple tempering becomes necessary.
Annealing:
Annealing is a crucial step that must be carried out after hot working and before re-hardening to ensure the material's optimal properties.
Heat the material at a controlled rate not exceeding 400°F per hour (222°C per hour) until it reaches a temperature of 1550-1600°F (843-871°C). Hold it at this temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum of 2 hours. Allow it to cool slowly within the furnace at a rate not exceeding 50°F per hour (15°C per hour) down to 1000°F (538°C). Finally, continue cooling to ambient temperature, either within the furnace or in open air.
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