Why Use Nitrogen when Welding Stainless Steel Pipes

The role of nitrogen in stainless steel welded pipes reflected on three aspects: stainless steel matrix structure, mechanical properties and corrosion resistance. Research shows that nitrogen is an element that forms and stabilizes austenite very strongly and expands the austenite phase. It can replace part of nickel in stainless steel, reduce the ferrite content in steel, and make austenite more stable. It can prevent the precipitation of harmful intermetallic phases and avoid martensitic transformation even under cold working conditions.

The effect of nitrogen on the mechanical properties of stainless steel manifested in: nitrogen improves the strength of stainless steel without reducing the plastic toughness of the material; nitrogen can improve the creep resistance, fatigue resistance, wear resistance and yield strength of stainless steel. As an element that improves corrosion resistance, nitrogen can form NH4+ in the pores, eliminate the generated H+, inhibit pH, thereby inhibiting the occurrence of pitting corrosion and the dissolution rate of metals in the pores, and improve local corrosion performance.

This is the reason why the stainless steel pipe needs to be welded with nitrogen, which can not only make the welding stronger, but also improve the performance of the pipe.

HCADTO Stainless Steel Co., Ltd. the Stainless Steel Division of ADTO GROUP, specializes in manufacturing stainless steel pipes, stainless steel angle bar, flat bar, round bar, square bar, hexagonal bar and channel bar in various grades and sizes. Our years of production experience and manufacturing facilities will ensure the good quality and competitive duration of our products.