All about alloys Expanite hardening
Whatever Your Stainless Steel Alloy
-There is Always an Expanite Solution
Expanite® surface hardening and heat treatment is developed to increase case hardness and improve wear, galling and corrosion resistance of austenitic, martensitic, ferritic and duplex stainless steels as well as nickel-based and cobalt-chromium alloys. Expanite has experience working with many alloys – typical examples are.
The Purpose of the Expanite Surface Hardening and Heat Treatment Processes!
ExpaniteHigh-T
The purpose of this process is to dissolve nitrogen in the surface of stainless steel to a depth of 1mm. Peak hardness ranges from 280HV on austenitic grades to 950HV on martensitic/ferritic grades.
ExpaniteLow-T
The purpose of this process is to dissolve nitrogen and carbon in the surface of stainless steel to a depth in the range of 5-30µm. Peak hardness ranges from 1100 to 1300HV on all grades.
SuperExpanite®
The purpose of this process is to combine ExpaniteHigh-T and ExpaniteLow-T processes to achieve higher load bearing and corrosion properties. Firstly, the ExpaniteHigh-T process is applied to create a deep case depth with moderate nitrogen content. Secondly, the ExpaniteLow-T process is applied to create a high-hardness surface on top of the ExpaniteHigh-T zone. The Expanite process does not result in a coating, but a diffusion zone with an increased carbon and nitrogen content. We call this zone expanded austenite, expanded martensite or simply: Expanite.
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