M2 high speed steel spare parts CNC machining matched surface treatment‌

The combination of ‌M2 high-speed steel spare parts CNC machining  matched surface treatment‌ delivers industrial-grade spare part performance with high precision and ultra-long service life, making it a cost-effective solution for high-load and high-wear working conditions.

 Inherent core advantages of M2 high-speed steel substrate
M2 (Chinese grade W6Mo5Cr4V2) is a molybdenum-based general-purpose high-speed steel. Its annealed hardness is ≤255HB, and it can reach ‌HRC 63~66‌ after standard vacuum quenching and multiple tempering processes, balancing high hardness, excellent red hardness and impact toughness.

It retains high hardness even at 500-600℃, avoiding thermal softening failure during continuous operation, perfectly fitting scenarios like high-speed cutting and high-load stamping that generate sustained heat.
Hard carbides formed by alloying elements including tungsten, molybdenum and vanadium bring strong anti-sticking properties, effectively preventing material adhesion during operation and greatly reducing the wear rate of the working surface.
Compared with ordinary alloy tool steels, it features outstanding impact resistance, can withstand vibration loads during operation, and greatly reduces the risk of edge chipping and fracture.
 Advantages of CNC precision machining process
The optimized multi-stage CNC machining workflow fully unlocks the material performance of M2 high-speed steel and solves the processing difficulties caused by its high hardness:

Adopting the stepwise strategy of rough machining in annealed state  finish machining after heat treatment, paired with high-rigidity equipment and dedicated carbide cutting tools, it stably achieves a high precision tolerance of ‌±0.01mm‌, and some precision spare parts can even reach ±0.002mm.
The deformation of the workpiece after heat treatment is well controlled, and the overall dimensional stability is extremely strong, fully meeting the accuracy requirements of precision mold inserts, high-load bearing bushes, industrial tooling spare parts.
It can directly complete the integrated forming of complex special-shaped contours, deep holes and thin-wall structures without secondary splicing, greatly improving the overall structural strength of the spare parts.
 Superimposed performance advantages of matched surface treatment
Targeted surface treatments for M2 high-speed steel spare parts can further push performance to a higher level based on working condition demands:

‌PVD coating (TiN/TiCN)‌: Forms a high-hardness coating over 2000HV on the workpiece surface, directly doubling the surface hardness, increasing the wear resistance service life of spare parts by 3~5 times, and reducing the friction coefficient of the working surface to prevent material adhesion.
‌Low-temperature gas nitriding‌: Forms a dense nitrided layer on the surface, further improving surface wear resistance and anti-seizure performance without changing the overall dimension of the workpiece, ideal for stamping dies, cold heading dies and other spare parts that frequently contact workpieces.
‌Mirror polishing‌: Improves the surface roughness to Ra 0.8 or even Ra 0.1~0.2μm, leaving no residual machining lines on the working surface, greatly reducing material adhesion during operation and enhancing the surface quality of finished processed workpieces.
 Comprehensive practical value
Spare parts produced with this full set of processes have an average service life 4~8 times longer than those made of ordinary carbon steel or low-alloy tool steel, greatly reducing equipment downtime and part replacement frequency. In the long run, it significantly cuts the overall operation and maintenance cost of factories,