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stainless steel annealing
expanite and stainless steel hardening
expanite and stainless steel hardening

Expanite / Stainless Steel Surface Hardening Heat Treating

Expanite High-T Process

ScreenHunter_41_Dec__10_16_36.jpgA high-temperature solution-nitriding process diffuses nitrogen deep into the bulk material. This process elevates the hardness of the material just below the surface which creates a unique load-bearing capacity and improves the corrosion resistance of the material. This process is performed at a high temperature to avoid chrome carbide or chrome nitride precipitation and improve corrosion resistance by converting any surface deformation martensite to austenite.

Benefit: Get all the benefits of solution annealing the core material while also deep case hardening the surface and increasing corrosion resistance.

Expanite Low-T Process

ScreenHunter_42_Dec__10_16_37.jpgA low-temperature surface-hardening process, by which a double hardened zone containing nitrogen and carbon is established. Nitrogen adds increased surface hardness while carbon bridges the gap to the softer core. A smooth hardness profile is tailored. The process is performed at low temperatures to avoid any chrome carbide or chrome nitride precipitation and retain the stainless steel's corrosion resistance.

Benefit: Controlled surface hardness between 1000-1800 HV.

Super Expanite Process

ScreenHunter_43_Dec__10_16_37.jpgBy combining the Expanite High-T and Expanite Low-T processes you create a thin case depth of previously unattainable surface hardness supported by a deeper case depth which has a very strong load-bearing capacity. Superior corrosion, wear and fatigue properties is the outcome. Super Expanite is simply setting new standards for what can be achieved by surface-hardening stainless steel with no loss of corrosion resistance.

Benefit: Superior corrosion, wear, scratch and fatigue properties.

Additional Expanite/ Stainless Steel Surface Hardening Advantages
  • Expanite processes are applicable to the most common stainless steel alloys including austenitic, martensitic, ferritic, PH, and duplex grades.
  • Expanite processes typically run day-to-day, which means that lead-times are significantly lower than alternatives.
  • Expanite processes are gaseous, thus parts can be treated as bulkware.
  • Expanite processes can deliver parts that withstand 1000+ hours in salt spray, while having a controlled surface hardness of 1000-1800 HV.
Inquiries for this process should be directed to Craig Zimmerman, Director-Technical.
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