17YRS
WU JII INDUSTRY CO., LTD.
886-4-23593510
886-4-23593529
No. 1, 20th Rd., Industrial Park, Taichung City, Taiwan
www.wujii.com.tw

Products

Standasd & Brand
M390
M390 (粉末不銹鋼)

Material properties

Our BÖHLER M390 MICROCLEAN grade is a corrosion resistant, Martensite chromium steel.

Large percentages of small, finely dispersed Cr- and V-carbides in a matrix containing at least 12% chromium offer the following benefits:

Highest corrosion resistance
Optimum wear resistance
Excellent polishability
Examples of applications

Mould inserts for the produotion of compact discs
Moulds for the processing of chemically aggressive plastics containing highly abrasive fillers
Moulds for the processing of duroplasts
Moulds for the prodoction of chips for the electronics industry.
Screws for injection moulding machines
Linings for injeclion moulding cylinders
Backflow check valves for injection moulding machines
Thanks to its outstanding properties, BÖHLER M390 MICROCLEAN is also suited for other industrial segments:

Machine components for the food processing industry
Knives blades
Cutting-type surgical instruments
Circular slitting knives for the meat processing industry

Specification

Heat treatment information

Heat treatment

Annealing

Approx. 1050°C/holding time at least 4 hours/controlled slow cooling in furnace at a rate of 
15°C/hr down to approx. 650°C, further cooling in air. 
Hardness after annealing: max. 280 HB

Stress relieving

650 to 700°C 
After through heating, soak for 1 to 2 hours in neutral atmosphere/ slow cooling in furnace

Hardening

Austenitizing in salt bath or in a protective atmosphere: 1070 to 1150°C/gas, salt bath, oil 
Austenitizing in vacuum: 1120 to 1200°C/ gas cooling minimum 3.5 bars. 
Holding time after through heating:30minutes 
The time in the cooling medium depends on the relevant workpiece size and furnace parameters. 
Obtainable hardness: 60-62HRC with air cooling.

Subzero treatment

Subzero cooling or tempering twice to the maximum secondary hardness is necessary to obtain complete transformation of residual austenite. After austenitizing at temperatures above 1150°C, subzero cooling is also recommended with a view to improving dimensional stability.

Tempering

150 to 400°C/slow heating to tempering temperature immediately after hardening/time in furnace 1 hour for each 20mm of workpiece thickness, but at least 2 hours. For information on the average hardness figures obtained after tempering please refer to the tempering chart. Working hardness:56-58HRC 
Maximum wear resistance is obtained by 
hardening at 1150°C + 2 tempering cycles at 540°C:58-62HRC(Attention corrosion resistance is slightly reduced)

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