What is Maxival?
Machining shops prefer to call it "an enhanced machining steel" while metallurgists call it "a
steel with a specified inclusion picture".
Maxival is new steel which combines a high machinability with high resistance
to corrosion without
prejudicing the ability to cold form the material.
These characteristics are achieved in the steelmaking process by:
- modifying both sulphide and oxide inclusions favorable for machining inside the upper
limit of sulphur ( S < 0.030 ) in analysis specification.
- controlling the inclusions type, shape and composition
- avoiding certain kinds of oxides which are extremely hard and cause abrasive wear of tool
The effect is obtained through silicon-calcium treatment:
- using Calcium as de-oxidizing agent
- converting to softer calcium inclusions which are enveloped by a soft sulphide case
These oxy-sulphides cause less abrasive wear and form a protective layer on the tool rake at
high and medium cutting speed .
This layer protects the tool against crater wear prolonging tool life, because these inclusions
have lubricating properties and deform easily.
Austenitic Stainless Steel
There are several modified austenitic stainless steels and one duplex in the Maxival Series.
The standard grades are:
|W. n° 1.4435
|W. n° 1.4460
Other Martensitic steel types, according to MV process, are available on