| Customization: | Available |
|---|---|
| Type: | Special Steel Bar |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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PM M4Our PM M4 high-speed tool steel offers unparalleled versatility, combining robust wear-resistance with exceptional impact toughness and bend strength. This unique material is characterized by its fine grain structure, minimal carbides, and superior steel cleanliness. PM M4Enhance your cutting tool longevity with PM M4, outperforming traditional M1,M2,,M7,and other low-alloy high-speed steels. It shines in cold work tooling, significantly outlasting high-carbon, high-chromium die steels like 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% efficiency compared to 1% carbon steel.
Rapidly heat from preheat.
For Cutting Tools:
For Cold Work Tooling:
Use the lowest temperature to maximize toughness and the highest temperature to enhance hot hardness.
Quenching:
Employ pressurized gas, warm oil, or salt.
For pressurized gas, ensure the furnace has a minimum quench pressure of 4 bars. Achieving a quench rate of approximately 400°F (222°C) per minute until below 1000°F (538°C) is critical for desired properties.
For oil quenching, immerse the steel until it turns black at approximately 900°F (482°C), then allow it to cool in still air until it reaches between 150-125°F (66-51°C).
For salt bath quenching, maintain the temperature between 1000-1100°F (538-593°C). Equalize the steel in the salt before cooling it in still air to 150-125°F (66-51°C).
Tempering:
Begin tempering immediately after quenching to ensure optimal performance.
The typical tempering temperature range is 1000-1100°F (538-593°C). Never temper below 1000°F (538°C). Maintain the temperature for 2 hours, then allow the material to air cool to ambient temperature. Double tempering is required, and triple tempering is necessary when austenitized at 2100°F (1149°C) or higher.
Annealing:
Annealing should be conducted after hot working and prior to re-hardening to ensure material integrity.
Heat the steel at a rate not exceeding 400°F per hour (222°C per hour) until it reaches 1550-1600°F (843-871°C). Hold this temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum duration of 2 hours. Subsequently, cool slowly with the furnace, not exceeding 50°F per hour (15°C per hour) until the temperature drops to 1000°F (538°C). Finally, finish cooling to ambient temperature either in the furnace or in the open air.
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