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Why is stabilization treatment necessary for 304 stainless steel pipes

Mr. Laijing Bu January 9, 2026


Stabilization treatment is also known as homogenization treatment. This is applicable to austenitic stainless steels containing titanium or niobium. For 304 stainless steel tubes, the following four situations typically require stabilization treatment: 

1. Weld pipes with strict requirements for resisting intergranular corrosion; 

2. For use under high temperature conditions (above 350℃); 

III. Inspect the products that failed the intergranular corrosion test based on the sample inspection results; 

4. Pipe materials that require extensive re-welding; 

Key points: 

For the customers, intergranular corrosion is the issue they are most concerned about. Therefore, when dealing with steel pipes with strict requirements for intergranular corrosion, after the solution treatment, a stabilization treatment needs to be carried out again. Adding titanium or niobium to 18-8 stainless steel pipes can eliminate intergranular corrosion, but it is actually impossible to completely eliminate it. 

Because when the titanium or niobium content is insufficient, some excess carbon will react with chromium to form chromium carbide, even if the titanium or niobium content is qualified. However, due to the presence of a large amount of titanium nitride impurities in the stainless steel product tubes, the effective titanium content will still be reduced. 

The heating temperature for stabilization treatment should be higher than the temperature at which chromium carbide completely dissolves, but lower than the temperature at which titanium carbide or niobium carbide completely dissolves, so that chromium carbide can be completely dissolved while titanium carbide or niobium carbide is partially retained. 

Then it is slowly cooled to allow the portion of titanium carbide or niobium carbide that was dissolved in the austenite during heating to fully precipitate during the cooling process. Thus, almost all of the carbon is stabilized in the form of titanium carbide or niobium carbide. 

After such treatment, chromium carbide will no longer precipitate, and the chromium content in the solid solution can be retained. Thus, the 304 stainless steel tube will not have the tendency of intergranular corrosion. The stabilization treatment usually adopts a temperature range of 880 to 950℃, with a holding time of 5 to 6 hours. The cooling method can be either air cooling or furnace cooling.


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