| Customization: | Available |
|---|---|
| Type: | Special Steel Bar |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
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PM M4Our high speed tool steel is a highly versatile material known for its exceptional blend of high wear-resistance, remarkable impact toughness, and superior bending strength. This outstanding performance is attributed to its fine grain size, minimal carbide presence, and unparalleled cleanliness. PM M4It offers a significant improvement in cutting tool longevity compared to the traditionally-manufactured M1,M2,M7and other lower-alloyed high-speed steels. Particularly excelling in cold work tooling applications, it outperforms 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 10 psi (214 GPa)
Machinability
40-45% of a 1% carbon steel
Heat rapidly from the preheat.
For Cutting Tools:
For Cold Work Tooling:
To achieve maximum toughness, use the lowest temperature. For optimal hot hardness, use the highest temperature.
Quenching:
Utilize pressurized gas, warm oil, or salt.
For pressurized gas, a furnace with a minimum quench pressure of 4 bars is essential. A quench rate of approximately 400°F (222°C) per minute to below 1000°F (538°C) is crucial to attain the desired properties.
For oil quenching, heat until the steel turns black, approximately 900°F (482°C), then let it cool in still air to a temperature range of 150-125°F (66-51°C).
For salt quenching, maintain the temperature between 1000-1100°F (538-593°C). After equalizing the steel in the salt bath, allow it to cool in still air to 150-125°F (66-51°C).
Tempering:
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). Hold the steel at the desired temperature for 2 hours, then let it air cool to ambient temperature. For enhanced durability, double tempering is required. If the steel was austenitized at 2100°F (1149°C) or above, triple tempering is mandatory.
Annealing:
Annealing must be done post-hot working and before re-hardening to relieve stresses and restore ductility.
Heat the steel at a controlled 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. 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). Finally, continue cooling to ambient temperature within the furnace or in the open air.
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