| Customization: | Available |
|---|---|
| Type: | Special Steel Bar |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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PM M4This high-speed tool steel offers remarkable versatility, providing an exceptional blend of high wear resistance, impressive impact toughness, and superior bend strength. These qualities stem from its fine grain size, minimal carbides, and unparalleled steel cleanliness. PM M4PM M4 extends cutting tool life well beyond that of conventionally-wrought M1.M2,M7and other lower-alloyed high-speed steels. It is particularly effective in cold work tooling applications, significantly outlasting high-carbon, high-chromium die steels like D2 and D3.
Other Known Names:CPM REX M4 steel®, ASP 2004, S690
Ideal for applications such as 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 106psi (214 GPa)
Machinability
40-45% of a 1% carbon steel
Heat rapidly following the preheat.
For Cutting Tools:
For Cold Work Tooling:
For maximum toughness, choose the lowest temperature. For maximum hot hardness, opt for the highest temperature.
Quenching:
Utilize pressurized gas, warm oil, or salt for quenching.
For pressurized gas quenching, ensure the furnace maintains a minimum quench pressure of 4 bars. Achieving a quench rate of approximately 400°F (222°C) per minute to below 1000°F (538°C) is essential for the desired properties.
For oil quenching, quench until the material turns black, approximately 900°F (482°C), and then allow it to cool in still air to 150-125°F (66-51°C).
To achieve optimal results with salt processing, maintain temperatures at a precise 1000-1100°F (538-593°C). Allow the material to equalize within the salt bath, then cool it in still air until it reaches a controlled 150-125°F (66-51°C).
Tempering:
Commence tempering immediately following the quenching process for best results.
Temper within the ideal temperature range of 1000-1100°F (538-593°C). Ensure not to temper below 1000°F (538°C). Maintain the chosen temperature for a full 2 hours, followed by air cooling to ambient temperature. Double tempering is essential, and triple tempering is required if austenitized at 2100°F (1149°C) or above.
Annealing:
Conduct annealing post-hot working and prior to any re-hardening processes for optimal results.
Heat at a controlled rate not exceeding 400°F per hour (222°C per hour) until reaching 1550-1600°F (843-871°C). Sustain this temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum of 2 hours. Subsequently, cool slowly with the furnace at a gradual rate not exceeding 50°F per hour (15°C per hour) until 1000°F (538°C) is reached. Continue cooling to ambient temperature either in the furnace or in air for uniform results.
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