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Food-grade stainless steel coil is a stainless steel pipe with a length of tens to hundreds of meters. However, do you know why food-grade stainless steel coil needs to be annealed? Zyta from Hua Steel will introduce to you the reasons for annealing food-grade stainless steel coil. Food-grade stainless steel coil needs to be annealed during the production process. What is the purpose of doing this? 1. Reduce hardness and improve machinability. The hardness of stainless steel welded pipe is relatively large, about ≤201HBW; ≤92HRB; ≤210HV. Only under soft conditions can stainless steel welded pipe be successfully rolled and form the food-grade stainless steel coil we see. 2. Eliminate residual stress, stabilize size, reduce deformation and crack tendency. 3. Refine grains, adjust structure, and eliminate structural defects. Annealing process is widely used in production. According to the different annealing purposes of the workpiece, there are many specifications for annealing process, including full annealing and stress annealing. Among them, the most commonly used is the continuous bright annealing furnace for food-grade stainless steel coil. About the stainless steel material grade ,Hua steel company can supply you 304, 316,316L , welcome your inquiry or message!