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

Properties & Application
W403VMR
W403VMR

Properties

Due to the balanced combination of a modified chemical composition and an optimised processing route, optimum material properties have been achieved in BÖHLER W403 VMR:

Good macro and microstructure with lowest levels of segregation
Lowest gas contents
Lowest levels of unwanted trace elements
Excellent homogeneity and isotropy
Highest degree of cleanliness
Highest toughness
Best polish ability
Best thermal conductivity
Highest dimensional stability during heat treatment
Good mach inability
Higher working hardness for increased service life (less hot wear, higher hot strength)

Specification

Heat treatment information

Heat treatment

Stress relieving

600 to650°C/ Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or in complex shapes. After thorough heating, hold in neutral atmosphere for 1-2 hours.

Hardening

1020 to 1030°C 
Oil, salt bath(500-550°C), air 
Holding time after temperature equalization: 15 to 30 minutes. 
Obtainable hardness: 52-54 HRC in oil or salt bath, 50-53 HRC in air.

Tempering

Slow cooling to tempering temperature immediately after hardening/ time in furnace 1 hour for each 20mm of workpiece thickness but at least 2 hours/cooling in air. It is recommended to temper at least twice. 
A third tempering cycle for the purpose of stress relieving may be advantageous stress relieving may be advantageous 
1 st tempering approx. 30°C above maximum secondary hardness. 
2 nd tempering to desired working hardness 
The tempering chart shows average tempered hardness values. 
3 rd for stress relieving at a temperature 30-50°C below highest tempering temperature.

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