The key to stainless steel nitriding is to remove the passivation film. The passivation film is the reason why stainless steel is rust-proof and cannot be nitrided. Therefore, in order to nitride the stainless steel, the key is to remove the passivation film on the surface. The purpose of stainless steel nitriding is to increase its hardness and improve its resistance to abrasion and erosion. There are chemical and mechanical methods for removing the passivation film. (1) Sandblasting. The workpiece is sandblasted with fine sand at a pressure of 0.15-0.25 MPa before nitriding until the surface is dark gray, and the surface dust is immediately entered into the furnace. (2) Phosphating. Phosphating the workpiece before nitriding can destroy the oxide film on the metal surface and form a porous and porous phosphating layer, which is beneficial to the infiltration of nitrogen atoms. (3) Chloride bubbles. The blasted or finished workpiece is bubbled or coated with chloride to effectively remove the oxide film. Commonly used chlorides are TiCl2 and TiCl3. Ferritic, martensitic and austenitic stainless steels and heat resistant steels are commonly used for nitriding. The chemical method is to soak the workpiece in 50% by volume hydrochloric acid (temperature 70 degrees), and then clean it with water; Nitriding of high speed steel Generally, high-speed steel nitriding should not appear in 3 phases, otherwise the layer will become brittle. According to the above rules, high-speed steel should be subjected to low-temperature short-time nitriding. Because the thickness of the layer is thicker at lower temperatures, it is easier to control, and the nitrogen concentration on the surface of the layer is lower. The short-time low-temperature nitriding concentration is low and the toughness is good. High-speed steel (w18cr4v) generally uses 510-520 degrees Celsius) diameter "15-20 minutes for 15mm, larger for 25-32min, and 60min for large scale." Concerned about surprises Label: Stainless steel nitride Previous: Main uses of several main stainless steel materials Next: How to choose tool materials when cutting stainless steel Fuonce-Lighting , https://www.szfuoncelightings.com