The Vacuum Annealing of M2 Metal

Material Properties of M2 High-Speed Steel

M2 is a quintessential general-purpose high-speed steel of the tungsten-molybdenum series. Due to its high proportion of alloying elements—including tungsten (W), molybdenum (Mo), chromium (Cr), and vanadium (V)—it achieves exceptional hardness while simultaneously possessing excellent toughness and “red hardness” (the ability to retain cutting performance in high-temperature cutting environments). Consequently, it is widely utilized in the manufacture of precision metal-cutting tools—such as twist drills, taps, and milling cutters—as well as wear-resistant cold-stamping dies.

Significance of Vacuum Annealing for M2 Components

The fundamental significance of vacuum annealing for M2 steel lies in its ability to eliminate lattice distortions and induce complete spheroidization of the microstructure within an oxygen-free, high-temperature environment. While effectively reducing the hardness of the powder—thereby facilitating subsequent compaction and forming processes—this treatment simultaneously prevents material oxidation or decarburization, thereby safeguarding the foundation of the material’s superior strength and toughness.

M2 Vacuum Annealing Process Phases

Regarding the vacuum annealing of M2 high-speed steel metal powder, this constitutes not merely a simple heating process, but a critical step for controlling powder hardness, eliminating work hardening, and preparing the material for subsequent compaction and forming:

1. Phase 1: Evacuate the furnace chamber to a vacuum level of 10–1 Pa, raise the temperature to 600°C, and hold for 1–2 hours;
2. Phase 2: Raise the temperature to 1100°C and hold for 2 hours;
3. Phase 3: Cool to 800°C and hold for 4 hours;
4. Phase 4: Cool at a rate of 10°C/min down to 500°C to prevent the generation of secondary stresses;
5. Phase 5: Once the temperature has dropped to 200°C, remove the material from the furnace.

Technical Specifications of SIMUWU RVA-8812 Furnace

The process library of the SIMUWU RVA-8812 vacuum annealing furnace encompasses tens of thousands of processes and is capable of perfectly executing the vacuum annealing of M2 steel. Its main technical parameters are as follows:

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