Steel M390 - 4.3 x 50 x 250 mm

Stainless Steel M390 MICROCLEAN - 4.3 x 50 x 250 mm

BÖHLER M390 MICROCLEAN stainless steel is a martensitic chrome steel produced by powder metallurgy. Thanks to the alloys used, this steel offers extremely high wear resistance and high corrosion resistance, which is a unique combination for the most demanding applications. Due to its extreme resistance to abrasion wear, it is also used for the production of special and custom-made knives, where an extremely long service life is required.

Properties of PM steel BÖHLER M390 MICROCLEAN

• Very good toughness and ductility
• Very high wear resistance
• Good machinability
• Very high dimensional stability
• Excellent polishability
• Very good corrosion resistance
• Very high micropurity

Heat treatment of PM steel BÖHLER M390 MICROCLEAN

Annealing to remove internal stress: 650 °C
Hardening: 1100 - 1180 °C, hold the temperature for 20 - 30 minutes (for a temperature of 1180 °C)
Tempering: for the highest corrosion resistance, temper once for a minimum of 2 hours at 200 - 300°C. For best wear resistance, temper twice for a minimum of 2 hours at 540 - 560°C. After each heat treatment step, the material should be cooled to approx. 30 °C!
Cryogenic heat treatment: - 80 °C, increases hardness by 1-3 HRC
Achieved hardness: 58 - 62 HRC

Chemical composition

Chemical composition: C 1.9; Si 0.7; Mn 0.3; Cr 20; Mo 1.0; V 4.0; W 0.6

Supplied material

The material is delivered in an annealed state.
There may be scale or surface corrosion on the surface.
Some material may already be descaled by sandblasting.
According to the production technology, the material may not be perfectly straight.
Microcracks may appear on the surface of the material from production, so it is recommended to sand off approx. 0.1 - 0.15 mm from the top layer.
The material is split with a water jet, laser technology or a band saw.
In the case of cutting the material with a laser, the edge may be cloudy after the cut, so when cutting the material with a band saw, we recommend first sanding off the weak layer of the edge to avoid dulling the saw band.

Dimensional tolerances

Material thickness tolerance: +/- 0.28 mm
Material width tolerance: +/- 1.0 mm
Material length tolerance: +/- 3.0 mm

Another blade steel

You can find more blade steel in the Carbon knife steel or Stainless steel knife category.

Grinding and sharpening knife steel and blades

Standard ceramic grit sanding belts such as 3M 777F, Norton R976, VSM XK870X, Deerfos PS999 or premium ceramic grit sanding belts such as 3M 1184F Cubitron 3, 3M Cubitron II 984F, 3M Cubitron II 784F can be used for steel grinding. Norton RazorStar R990S, Norton R980, Deerfos Bora7. 3M Trizact 237AA, 3M Trizact 337DC, Norton NORaX U254, VSM KK712X, VSM KK772J and others can be used to sharpen and polish the blades.