Brazing stainless steel requires careful consideration of several factors to ensure the process is effective and does not degrade the material.
5 Key Factors to Consider
1. Type of Stainless Steel
The temperature needed to braze stainless steel varies depending on the type of stainless steel being used.
2. Sensitization Temperature Range
For austenitic stainless steel without stabilizing elements like Ti or Nb, brazing should avoid the sensitization temperature range of 500-850°C. This prevents chromium carbide precipitation and reduces corrosion resistance.
3. Martensitic Stainless Steel Requirements
Martensitic stainless steel requires a more stringent temperature. It should either match the quenching temperature or be lower than the tempering temperature to avoid material softening.
4. Minimum Brazing Temperature
The minimum brazing temperature for most alloys is typically at least 25°C above the liquidus temperature. This ensures proper flow and reaction with the base metal.
5. Brazing Time and Cooling
The brazing time should be sufficient to uniformly heat all parts, usually between 5 and 10 minutes. Cooling should start after the braze soak, ensuring the temperature is at least 25°C below the solidus temperature before quenching to prevent braze alloy loss.
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