| Customization: | Available |
|---|---|
| Type: | Special Steel Bar |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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PM M4High-speed tool steel PM M4 is an exceptionally versatile material that offers a remarkable blend of high wear-resistance, impact toughness, and bending strength. These superior characteristics are achieved through its fine grain structure, minimal carbide content, and unparalleled cleanliness. PM M4PM M4 provides a significantly enhanced cutting tool life in comparison to traditionally-wrought M1,M2, M7along with other lower-alloyed high-speed steels. It is particularly outstanding in cold work tooling applications, delivering a performance that surpasses 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
40-45% of a 1% carbon steel
Heat quickly from the preheat stage.
For Cutting Tools:
For Cold Work Tooling:
For maximizing toughness, use the lowest temperature. For maximizing hot hardness, opt for the highest temperature.
Quenching:
Utilize 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 about 400°F (222°C) per minute to below 1000°F (538°C) is essential to meet the desired material properties.
Quenching for Oil: Immerse the material until it turns black, reaching approximately 900°F (482°C). Afterwards, let it cool in still air until it reaches a temperature between 150-125°F (66-51°C).
Quenching for Salt: Maintain the salt bath at a temperature ranging from 1000-1100°F (538-593°C). Allow the material to equalize within the salt bath, then cool in still air until it reaches a temperature between 150-125°F (66-51°C).
Tempering Process:
Begin tempering immediately after quenching to ensure optimal results.
The ideal tempering temperature range is 1000-1100°F (538-593°C). Avoid tempering below 1000°F (538°C). Maintain the temperature for 2 hours, then allow the material to air cool to ambient temperature. Double tempering is a must, and if austenitized at 2100°F (1149°C) or higher, triple tempering is essential.
Annealing Process:
Annealing should be conducted post hot-working and prior to re-hardening for best results.
Heat the material at a rate not exceeding 400°F per hour (222°C per hour) until it reaches 1550-1600°F (843-871°C). Hold at this temperature for 1 hour per inch (25.4 mm) of thickness, with a minimum hold time of 2 hours. Subsequently, cool slowly within the furnace at a rate of 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 the air.
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