| Customization: | Available |
|---|---|
| Type: | Special Steel Bar |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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PM M4This high-speed tool steel is a remarkably versatile material that offers a distinctive blend of high wear-resistance, exceptional impact toughness, and superior bend strength. These attributes stem from its fine grain size, minimal carbides, and outstanding purity. PM M4It provides enhanced cutting tool longevity when compared to conventionally-wrought M1 steel.M2, M7and other lower-alloyed high-speed steels. It is particularly outstanding in cold work tooling applications, surpassing high-carbon, high-chromium die steels like D2 and D3 in performance and durability.
Other Known Names:CPM REX M4 steel®, ASP 2004, S690
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
40-45% of a 1% carbon steel
Heat quickly from the preheat stage.
For Cutting Tools:
For Cold Work Tooling:
To maximize toughness, utilize the lowest temperature setting. To enhance hot hardness, opt for the highest temperature setting.
Quenching:
Employ pressurized gas, warm oil, or salt for quenching.
For pressurized gas quenching, the furnace should maintain a minimum quench pressure of 4 bars. An optimal quench rate of approximately 400°F (222°C) per minute down to below 1000°F (538°C) is essential to achieve the desired material properties.
For oil quenching, heat until the metal turns black, approximately reaching 900°F (482°C). After achieving this temperature, let it cool naturally in still air until it reaches a temperature between 150-125°F (66-51°C).
When using a salt bath, maintain a consistent temperature range of 1000-1100°F (538-593°C). Ensure the metal is equalized in the salt bath before letting it cool in still air to a temperature between 150-125°F (66-51°C).
Tempering Process:
Begin the tempering process immediately after quenching to ensure optimal results.
The optimal tempering temperature range is 1000-1100°F (538-593°C). It is crucial not to temper below 1000°F (538°C). Maintain the chosen temperature for 2 hours, followed by air cooling to reach ambient temperature. Double tempering is mandated for structural integrity. For austenitizing at 2100°F (1149°C) or higher, triple tempering is necessary.
Annealing Process:
Annealing is essential post hot working and prior to re-hardening to ensure the material's properties are optimized.
Heat the material at a controlled rate not exceeding 400°F per hour (222°C per hour) until it reaches a temperature range of 1550-1600°F (843-871°C). Hold this temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum of 2 hours. Subsequently, let it cool gradually within the furnace at a rate not exceeding 50°F per hour (15°C per hour) until it reaches 1000°F (538°C). Complete the cooling process to ambient temperature either in the furnace or in air.
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