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

Microclean Powder Metallurgy
S390 (T-15)
S390 (T-15)

Properties

High speed steel produced by powder metallurgy methods with highest wear resistance, red hardness and compressive strength.

The PM technology imparts to the material also excellent toughness and mach inability, e.g.highly satisfactory grndability.



Application

Heavy-duty machining tools
E.g. tools for nonferrous metals such as titanium and aluminium alloys.

Pinion type cutters of single or multipiece design
Side milling cutters, profile cutters, hob milling cutters
Broaching tools of all types
Chucking taps
Twist drills
Chasing tools
Reamers
Bimetal stripes for saw blades
Tools used under extreme compressive stresses

E.g. precision blanking tools for high-strength materials.

Punches
Dies

Specification

Heat treatment information

Heat treatment

Hot forming 
Forging

1150 to 900°C 
Slow cooling in furnace or in thermo insulating material.

Annealing

770 to 840°C/ 4h/ controlled slow cooling in furnace (10-20°C) to 740°C/2h/ cooling in furnace. 
Hardness after annealing: max. 300 Brinell.

Stress relieving

600 to 650°C 
Slow cooling in furnace. 
To relieve stresses set up by extensive machining or in tools of intricate shape. After through heating, hold in neutral atmosphere for 1 to 2 hours.

Hardening

1150 to 1230°C 
Oil, salt bath (500-550°C), dry air blast. Upper temperature range for parts of simple shape, lower for parts of complex shape. For cold working tools also lower temperatures are of importance for higher toughness. Soaking time after heating up the whole section of a workpiece 80 seconds minimum is required for dissolving sufficient carbides. 
Maximum soaking time 150 seconds to avoid detriments by over soaking. In practice instead of soaking time the time of exposure from placing the workpiece into the salth bath after preheating until removing (including the stages of heating to the specified surface temperature and of heating to the temperature throughout the whole section) is used. 
Vacuum hardening is also possible. The time in the vacuum furnace depends on the relevant workpiece size and furnace parameters.

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