Factors Influencing Brightness of Stainless Steel Caps during Annealing

　　After annealing, the brightness of the Stainless Steel Caps decides the quality of the product. There are many factors affecting its brightness. Here are the five most important factors for you:

　　1. Whether the annealing temperature reaches the prescribed temperature or not, the heat treatment of Stainless Steel Caps usually adopts solution heat treatment, which is commonly called "annealing", and the temperature range is 1040-1120 degrees (Japanese standard). You can also observe the holes in the annealing furnace. The ASTM 2 Inch Quality Stainless Steel Pipe Fitting Cap in the annealing zone should be incandescent, but there is no sagging of the softening hanger.

　　2. The annealing atmosphere generally uses pure hydrogen as the annealing atmosphere. The purity of the atmosphere is better than 99.99%. If the other part of the atmosphere is inert gas, the purity can also be lower, but absolutely can not contain excessive oxygen and water vapor.

　　3. The sealed bright annealing furnace of the furnace body should be closed and isolated from the outside air; only one exhaust outlet (used to ignite the exhausted hydrogen) is open when hydrogen is used as protective gas. Soap water can be used to smear the cracks in each joint of the annealing furnace to see if it runs out. The most easily runs out is the place where the annealing furnace enters and leaves the tube. The sealing rings in this place are particularly easy to wear and tear, so it is necessary to check and replace them frequently.