Does the cold drawn pipe need nitrogen during welding ?
Nitrogen is used in the processing of cold drawn tubes and other stainless steel products, especially during welding. Maybe many friends don't understand why it is necessary to use nitrogen in the welding of cold-drawn pipes. Next, Wuxi Qifang Steel Pipe Co., Ltd. will give you popular science knowledge.
The role of nitrogen in cold drawn tubes is mainly reflected in three aspects: stainless steel matrix structure, mechanical properties and corrosion resistance. Studies have shown that nitrogen is an element that strongly forms and stabilizes austenite and extends the austenite phase. It can replace part of nickel in stainless steel, reduce the ferrite content in steel, and make austenite more stable. Harmful intermetallic phase separation and martensitic transformation are avoided even under cold working conditions. The influence of nitrogen on the mechanical properties of stainless steel is mainly reflected in: nitrogen significantly improves the strength of stainless steel, but does not reduce the plastic resistance 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+ , suppress the pH value, inhibit the occurrence of pitting corrosion and the dissolution rate of metal in the pores, and improve the local corrosion function. Cold-drawn tubes are widely used in stainless steel, food equipment, general chemical equipment and atomic energy industrial equipment. Precision steel pipe is a multi-purpose cold-drawn pipe widely used in the production of equipment and components that require excellent functions (corrosion resistance, forming). Its high temperature function can reach 1000-1200 degrees. 304 stainless steel has excellent corrosion resistance and corrosion resistance. The concentration of 304 stainless steel is lower than 65% of the boiling point of nitric acid , which has strong corrosion resistance. It also has excellent corrosion resistance to alkaline solutions and most organic and inorganic acids.
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