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  Using different materials all bearing parts bearing industry production. Materials forprocessing, in order to achieve ideal performance, maximize performance and service life of the bearing. The material described here is the most commonly used. More information information-European high SI bearing co., Ltd.

  SAE 52100 bearing steel chrome

  The most commonly used materials, precision ball bearings, the products bearing structure of roller bearings and Taper roller bearings, 52100 chrome steel. These parts are bearings inner and outer rings, ball and roller. The chemical composition of steel with a high carbon content of chromium and 1.5%. Control processing and heat treatment method of bearing Assembly with high cracking resistance and hard surface of rolling contact fatigue resistance underground. Typical surface hardness of bearing components made of this material from 60~64 Rockwell c hardness scale (RC).

  Extra clean 52100 chrome steel

  Original steel used in the manufacture of high precision miniature bearing additionalsteps. The result is a very homogeneous fine grain structural steels, can complete the super smooth bearing contact surface, bearing is very quiet.

  Most common heat treatment method in steel is through hardened steel in a controlled atmosphere furnace. Bearing manufacturing steel continuous temperature up to120 ° c. operation

  At higher temperatures, it is possible that the thermal stability of the bearing Assembly. Through different heat treatment processes, production of bearings also operates at a temperature of 220 ° c and higher. The components for these applications, the need for tempering temperature corresponds to the temperature at a high service. This improves tempering treatment on the hardness of the material and adversely affect the carrying capacity of the bearing, lower.

  SAE 52100 is a very good general bearing steel. Due to its high hardness and wear resistance, good fatigue life of rolling bearings. However, chromium stainless steel corrosion resistance due to low chromium content. Bearing surface should be coatedwith antirust oil or block and protect.

  Stainless steel bearings

  Stainless steel material using the bearing components, because it is more resistantto corrosion due to the high chromium content (~ 18%) with the addition of nickel.Chromium reacts with oxygen, forming a layer of chromium oxide on the surface, the passivation film formed.

  Martensitic stainless steel AISI 440C

  400 series stainless steel carbon content is high enough to be hardened using standard methods of heat treatment to rc58. Due to the low hardness, load capacity 20%, bearings made from this material, than their 52100 chrome steel bearings. Carbon content level means the magnetic component. Corrosion resistance is "good", 440C materials are exposed to fresh water and a mild chemicals. This material is primarily used by American bearing manufacturers.

  440C stainless steel miniature bearings from the traditional will be slightly noisy, large carbides at grain boundaries, usually focused on the Raceway exposed in the process. Big bore of the bearing is not affected by this condition. From 400 series stainless steel bearings can be used in temperatures higher than chromium steel, up to 250 ° c continuous. Made of this material the bearings are generally more expensivethan chrome steel bearings.

  Martensitic stainless steel – acd34/ks440/x65cr13

  Many micro-bearings manufacturer, making their ring-and-ball, stainless steel lowercarbon and chromium content than AISI 440C known under several names, including acd34,ks440, and x65cr13. After the heat treatment, the material has less carbon,so bearing has excellent low-noise characteristics, and offers the same resistance to corrosion, 440C. From the material production of bearings, some manufacturerswill publish the same rated load of chrome alloy steel. This is due to the strict control of the heat treatment, hardness of RC 60 results. Although this is one of the mostwidely used stainless steel ball bearings, there is no such material AISI design.

  Martensitic stainless steels-SV30

  Martensitic stainless steels can be modified in the processing of the original steel byreducing carbon content and the introduction of nitrogen as an alloying element. Nitrogen increased thereby transformed into chrome chromium nitride saturated, whilechromium carbides. The result is a high strength, excellent organization extending fatigue life of high hardness steels like 100% (ii) in certain applications. This material also provides enhanced corrosion resistance, better than 440C and acd34 – 5 times. Bearing 20–40% can be taken of the use of the materials, but tend to be offset byincome price premium for superior performance. SV30 technical data sheet for more information is available.

  Heat treatment of bearing steel

  When the bearing steel in soft (unhardened), metallurgist pearlitic structure. In order to harden the steel must be heated to very high temperatures and then rapidly cooled. When 1750 ° f heat treatment furnace, the austenite structure from what is known of Pearlite. Quenched (cooled very quickly), then the structural transformation from austenite to martensite. Once transformed into martensite, steel is tough. However, at this point are not considered "thermal stability". This is because not all of theaustenite into martensite quenching process. This phenomenon is known as "reservations" austenitic ".

  If retained austenite in steel is not heat stable, over a longer period of time (even years) into martensite. This change was accompanied by increasing volume, known as metallurgy growth (not be confused with thermal growth). Metallurgy growth cancause dimensional changes and any form of steel parts such as bearings, even at room temperature.

  Rather than a product bearing accuracy problems in high precision (ABEC 5P,7P,9P)lack of micro-dimension stability of bearing can cause problems. In order to eliminate this unnecessary growth of metallurgical, steel must be subjected to thermal stability. This is done by low-temperature cycle is repeated 120 f retained austenite andtempering of a large part of martensite.

  Austenitic stainless steel AISI316

  Bearing components made of 300 series stainless steel materials having high corrosion resistance, non-magnetic due to the low carbon content. However, the tradeoff is, this material is not hardened, the bearing can only run in low load and speed. Bearing surface chemical reaction of oxygen is called passivation treatment; development of passive film on the surface of the protect the bearing against corrosion. Bestcorrosion resistance when the bearing is not completely submerged in the liquid (such as water). Bearings are special order items made from this material the minimum number, in addition, they are more expensive.

  300 series stainless steel

  Bearing cover seal washer and ball retainers is sometimes aisi303/304 stainless steel corrosion resistance because they have a moderate, is to form various shapes better.

  Carbon steel bearing

  Materials used in the production of carbon steel bearing assemblies and there are two basic types of medium and low carbon alloy steel.

  Medium carbon alloy steel

  From medium and low carbon alloy steel bearings are generally referred to as "halfprecision" or "commercial" bearings. Typical materials are aisi8620 or aisi4320. Inner and outer rings in a heat treatment process called hardening or carburizing and hardening. Bearings made from these materials can't be high-load or high operationspeed, they are not corrosive. Bearings made from these materials are usually lowcost.

  Low carbon alloy steel

  Bearing cage that is used in the production of low carbon steel, metal shield, metalwasher, and rubber seal. Common material is AISI C1008 and micro-controllers. Corrosion materials need to be protected with a coating of oil/grease (cage) or coated(shields). Home Minister and close more information can be found in the respectivetechnical reports.

  Plastic and nonmetallic bearings

  Plastic is sometimes used for bearing cages. Nylon is the most common plastic molding acetals (POM) is also used. Other polymers used in special bearing design for aspecific performance requirements, such as high speed, or the determination of thelow torque and low noise.

  By phenolic resin cage (phenolic) materials used in machine tool spindle of high speed ball bearings are the most common. Phenolic resin cage light weight and high strength. Processing costs, this material has LED increase in the use of plastics. Additional information is contained in a cage of technical bulletins.

  Seals

  Most common seal materials for rubber, nitrile rubber or rubber. It has good mechanical properties, can be used in a wide temperature range, and is resistant to manychemicals, and low cost. Such as fluoro elastic rubber and Silicon is expensive and they are typically used when an application requires their unique properties.

  Made of ceramic bearings

  Ceramic materials from falling into the specialized niche building bearing in the bearing industry. The most common arrangement is a kind of hybrid bearings, usually made of stainless steel and ceramic balls. The most common material is silicon nitrideceramics. Balls made from this material are very difficult, to rc78 has a very smoothsurface. Hybrid bearings, stainless steel bearings are more expensive than.

 

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