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Why use nitrogen welding for stainless steel welded pipes?
Why use nitrogen welding for stainless steel welded pipes?
The role of nitrogen in stainless steel welded pipes is mainly reflected in the structure, mechanical properties and corrosion resistance of stainless steel.
First of all, nitrogen is a very strong element, which can form and stabilize austenite and expand the austenite phase. It can also replace part of the nickel in stainless steel, reduce the ferrite content, and make the austenite more stable. Even under cold working conditions, the precipitation of harmful intermetallic phases and martensitic transformation can also be prevented.
The second is the effect of nitrogen on the mechanical properties of stainless steel: nitrogen can significantly increase the strength of stainless steel without reducing the plasticity and toughness of stainless steel; nitrogen can also improve the creep resistance, fatigue resistance, wear resistance and yield strength of stainless steel.
Finally, as an element that improves corrosion resistance, nitrogen can also form nitrogen in the NH4+ in the pores, eliminate the generation of H+, inhibit the pH value, thereby inhibit the occurrence and dissolution rate of pitting corrosion in the metal pores, and effectively improve local corrosion.
Therefore, in production, we always insist on using nitrogen as internal protection, which greatly reduces the probability of pipes from rusting at the weld seam in the later stage, and the pipes produced by some manufacturers that do not use nitrogen internal protection are easy to crack and rust at the weld seam. Nitrogen is required for welding of stainless steel welded pipes. For more stainless steel knowledge, you are also welcome to consult online or visit our factory!
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