Austenitic stainless steels with better machinability than standard grades 

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Austenitic Stainless Steel

Machinability
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MAXIVAL


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:

AISI 304 MVAIS AUSTENITIC
AISI 304L MVAISL AUSTENITIC
AISI 316 MVAPM AUSTENITIC
AISI 316L MVAPML AUSTENITIC
W. n 1.4435 MVAPMLD2 AUSTENITIC
W. n 1.4460 MV274MDE DUPLEX


Other Martensitic steel types, according to MV process, are available on request.



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