Pitting Resistance Equivalent Number
Pitting resistance equivalent is a value that indicates the corrosion resistance of stainless steels to pitting corrosion. It considers chromium, molybdenum, and nitrogen. Higher values mean better corrosion resistance.
Physicochemical Mechanism of Action
The Pitting Resistance Equivalent (PRE) measures the corrosion resistance of a steel by the proportion of chromium, molybdenum, and nitrogen. These elements create a dense protective layer on the steel's surface that prevents rust formation.
Metallurgical Relevance & Welding Risks
A low PRE value can lead to pitting corrosion, especially in moist or salty environments. This can cause cracks and loss of mechanical properties in the steel.
Workshop Practice & Procedures
To increase pitting resistance, you can raise the content of chromium, molybdenum, or nitrogen. When welding stainless steels, it's important to ensure proper melting temperature and careful cooling to maintain PRE values.