Heat Treatment Of SUS321 347 Stainless Steel
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Heat treatment of SUS321 and SUS347 stainless steel bars: How to improve corrosion resistance and high temperature performance?
Core process of heat treatment: solution treatment + stabilization treatment
Solution treatment (Solution Annealing)
Purpose: dissolve carbides, form a single austenite structure, and improve corrosion resistance.
Eliminate cold working stress and improve processing performance.
Process parameters: Temperature: 1010~1150℃ (adjusted according to thickness, such as 1050℃ for thin-walled parts).
Insulation time: calculated according to thickness (for example: 25mm thick insulation for 1 hour).
Cooling method: rapid water cooling (to avoid carbide precipitation).
Stabilization Annealing
Purpose: Make titanium (SUS321) or niobium (SUS347) preferentially combine with carbon to form stable carbides (TiC/NbC) to prevent intergranular corrosion.
Process parameters:
SUS321: 850~880℃ insulation for 2~4 hours.
SUS347: 900~950℃ for 3~5 hours (niobium requires higher temperature to fully react).
Cooling method: air cooling or furnace cooling.
SUS321 vs SUS347
| Property | SUS321 (Titanium-Stabilized) | SUS347 (Niobium-Stabilized) | SEO Keywords |
|---|---|---|---|
| Stabilization Temperature | Lower (850–880°C) | Higher (900–950°C) | SUS321 heat treatment temperature, SUS347 heat treatment process |
| High-Temperature Performance | Limited creep resistance (<=650°C) | Superior oxidation resistance (>650°C) | High-temperature stainless steel heat treatment, SUS347 high-temperature resistance |
| Typical Applications | Automotive exhaust systems, heat exchangers | Nuclear piping, ethylene cracking |
