These Benefits Can Be Categorized Into Six Key Areas

Bright Annealing / Bright Quenching (Most Common Application): When steel is heated to high temperatures, exposure to air causes rusting, oxidation, surface decarburization, and insufficient hardness. By introducing nitrogen to displace the air, workpieces emerge from the furnace with a bright, silvery-white finish, free of oxide scale. This completely eliminates surface decarburization while guaranteeing the required hardness and wear resistance. It is an essential process for the annealing of molds, bearing steels, stainless steels, and steel strips.

Carburizing and Carbonitriding Protection: Nitrogen is used to dilute the furnace atmosphere, thereby stabilizing the carbon potential and ensuring a uniform carburized layer. This results in consistent workpiece hardness, minimizes internal oxidation, and enhances the overall metallographic quality.

Tempering and Solution Treatment: For processes such as stainless steel solution treatment and high-temperature tempering, nitrogen purging prevents intergranular corrosion and stabilizes the metallurgical structure, ensuring the material remains free of discoloration or blackening.

Gas Quenching (Common in Vacuum Furnaces): Following vacuum heating, high-pressure nitrogen is rapidly introduced to facilitate rapid cooling. This method minimizes deformation, ensures uniform hardness, and serves as an effective alternative to oil quenching, leaving the workpieces clean and free of oil residue.