Why Use Nitrogen When Welding Stainless Steel Pipes?

In the stainless steel industry, nitrogen is often used, especially in the welding process of stainless steel welded pipes. Many wonder why this is necessary. Here's an explanation:

1. Structural Stability: Nitrogen plays a crucial role in the structure, mechanical properties, and corrosion resistance of stainless steel. It strengthens and stabilizes the austenite phase, making it more stable and reducing ferrite content.

2. Mechanical Properties: Nitrogen increases the strength of stainless steel without compromising ductility and toughness. It enhances creep resistance, fatigue resistance, wear resistance, and yield strength.

3. Corrosion Resistance: Nitrogen helps prevent pitting and enhances local corrosion resistance by forming nitrogen gas in pits and reducing the dissolution rate of metal in corrosive environments.