Ferritic Stainless Steel
Expanite surface hardening can be applied to a variety of alloy materials and all main categories of stainless steel including Ferritic.
Ferritic stainless steel is on of the major categories of stainless steel include martensitic, austenitic, duplex, and precipitation hardened variants. A significant portion of the AISI 400-series stainless steels falls into the category of ferritic steels. In contrast to austenitic variants, these exhibit lower susceptibility to cold working for hardening, reduced weldability, and are not recommended for use at cryogenic temperatures. However, certain types within this category, such as 430, demonstrate outstanding corrosion resistance and exceptional heat tolerance.
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UNS S43000 / AISI 430 / 1.4016
AISI 430 stainless is a corrosion- and heat-resisting 17% chromium ferritic stainless steel used for all types of decorative trim as the color resembles that of chromium plate when buffed. Ferritic stainless steels generally have better engineering properties than austenitic grades but have reduced corrosion resistance because of the lower chromium and nickel content. They are also usually less expensive. Ferritic stainless steels have a body-centered cubic crystal system and contain between 10.5% and 27% chromium with very little nickel, if any, but some types can contain lead. Most compositions include molybdenum; some, aluminium or titanium. Ferritic stainless steels are best known for their excellent ductility, making them a frequent material for kitchenware and automotive parts.
| AISI |
EN |
| 405 |
1.4000 |
| 409L |
1.4512 |
| 410L |
1.4003 |
| 430 |
1.4016 |
| 439 |
1.4510 |
| 430Ti |
1.4511 |
| 441 |
1.4509 |
| 434 |
1.4113 |
| 436 |
1.4513 |
| 444 |
1.4521 |
| 447 |
1.4592 |
The purpose of the process:
ExpaniteHigh-T
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.
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 1100-1300HV.
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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