| Customization: | Available |
|---|---|
| Type: | Special Steel Bar |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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PM M4This high-speed tool steel is an exceptionally versatile material, offering a remarkable balance of high wear-resistance, impressive impact toughness, and superior bend strength. These attributes stem from its fine grain size, small carbides, and exceptional cleanliness. PM M4PM M4 delivers enhanced cutting tool longevity when compared to traditional M1.M2, M7and other lower-alloy high-speed steels. It excels 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 like 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 from the preheat stage.
For Cutting Tools:
For Cold Work Tooling:
To optimize toughness, use the lowest temperature; for maximum hot hardness, use the highest temperature.
Quenching:
Employ 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 attaining the desired material properties.
For oil: Quench until the steel acquires a deep black hue, approximately at a temperature of 900°F (482°C). Subsequently, let it cool in still air until it reaches a range of 150-125°F (66-51°C).
For salt: Maintain the temperature between 1000-1100°F (538-593°C). Once equilibrium is reached in the salt, allow the steel to cool in still air, bringing the temperature down to 150-125°F (66-51°C).
Tempering:
Begin tempering immediately after quenching to achieve optimal results.
The typical tempering temperature ranges from 1000-1100°F (538-593°C). It is crucial not to temper below 1000°F (538°C). Maintain the temperature for 2 hours, followed by air cooling to ambient temperature. Double tempering is mandatory, and triple tempering is required if austenitized at temperatures of 2100°F (1149°C) or higher.
Annealing:
Annealing is essential after hot working and prior to re-hardening to ensure material integrity.
Heat the steel at a gradual rate not exceeding 400°F per hour (222°C per hour) until it reaches 1550-1600°F (843-871°C). Maintain this temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum duration of 2 hours. Then, cool the steel slowly with the furnace at a rate not exceeding 50°F per hour (15°C per hour) until it reaches 1000°F (538°C). Continue cooling to ambient temperature either in the furnace or in air.
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