Whatever your stainless steel alloy, there is always an Expanite solution!
Expanite® is developed to increase surface hardness and wear 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
201 / 301 / 303 / 304 / 305 / 308 / 310 / 316 / 904
420 / 440 / 17-4PH / 17-7PH
2205 / 2507
430 / 431 / 434
The purpose of the process:
The purpose of this process is to dissolve nitrogen in the surface of stainless steel to a depth in the range of 0.2-2 mm. Peak hardness ranges from 280HV on austenitic grades to 950HV on martensitic/ferritic grades.
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 1000-1200HV on austenitic grades to 1200-1800HV on martensitic/ferritic grades.
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.