1: Does bearing steel rust? Yes, it will rust. Bearing steel, including stainless steel, rusts. Although stainless steel is claimed to be rust-free, it does in fact rust, and in fact there is no rust-free steel in the world! 2: How does bearing steel rust? The so-called stainless steel, it means that the degree of corrosion resistance is just different. Corrosion rate <0.01mm/y, considered “fully corrosion-resistant”. Corrosion rate <0.1mm/y, it is considered “corrosion resistant”. Corrosion rate > 0.1mm/y, is considered “not corrosion-resistant”, that is, general steel. In addition to a small number of bearing steel is stainless bearing steel, most of them are ordinary corrosion-resistant steel, so rust is not surprising, very normal. 3: Why do bearings rust? Bearing rust is related to the material and the environment in which it is used. Bearing steel itself contains carbon and will react when it encounters water vapour. If you want to prevent the bearings from rusting, you should do a good job of anti-rust treatment. Or use non-steel bearings. Metal products are prone to rusting after oxidation, and stainless steel bearings are no exception. Many factors affect its rust: such as the chemical composition and structure of the metal material itself; the surface finish (oxygen concentration difference battery corrosion); the composition and pH of the solution in contact with the metal surface; and the environment in which it is located and many other factors, these are the direct factors that make the bearing rust. In addition, when we use the bearings, do not use your hands to directly touch the items, because when sweat and bearing contact, will form a layer of sweat film on the bearing surface, sweat film will cause electrochemical effects on the bearing, corrosion of the bearing. Therefore, we should use special tools such as special gloves or finger covers to pick up the bearings and not to contact them directly with our hands. 4: Will the bearings made of GCr15 bearing steel rust in outdoor environment? The Cr content of this steel is too small, the value behind the bearing steel is the Cr content, the unit is one thousandth, the Cr content of GCr15 is only about 1.5%, if the Cr content can be close to the 13% cut-off, the rust prevention effect is better, for example, Cr12 (containing Cr 12% or so) type of steel is basically Not much rusting. 5: Can bearing steel be rust-proof? Although the Cr content of bearing steel is relatively high, it has a certain effect of rust prevention, but the Cr content of steel is small, the Cr content of GCr15 is only about 1.5%, the Cr element at this time is to improve the mechanical properties of steel, bearing steel Cr is to improve the hardenability is not used to prevent rust. As with metals in general, wet conditions can cause rusting. Therefore, rust prevention measures for bearings and their parts are still very necessary. 6: Methods to prevent rusting of bearings? ①Surface cleaning method. Cleaning must be based on the nature of the surface of the rust prevention material and the prevailing conditions, and the appropriate method must be selected. Solvent cleaning, chemical treatment cleaning and mechanical cleaning methods are commonly used. When the surface is dry and clean, filtered dry compressed air can be used to blow it dry, or a 120~170℃ dryer can be used to dry it, or a clean gauze can be used to dry it. ②Methods of applying anti-rust oil (1) Immersion method: Some small bearings are immersed in antirust grease to allow a layer of antirust grease to adhere to their surface. The thickness of the oil film can be achieved by controlling the temperature or viscosity of the anti-rust grease. (2) Brushing method: Used for large bearings that are not suitable for soaking or spraying. When brushing, care should be taken not to produce a build-up, but also to prevent leakage. (3) Spray method: Some large bearings cannot be oiled by the immersion method, and are generally sprayed with filtered compressed air at approximately 0.7Mpa pressure in a clean air area. The spray method is suitable for solvent diluted anti-rust oil or thin layer of anti-rust oil, but perfect fire and labour protection measures must be adopted.