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Material Info

ISO

P

Material Group - Bearing Steel


The main requirements of bearing steel are high hardness, elastic properties, Resistance to fatigue and contact fatigue failure. These requirements are satisfied by high carbon alloy steels

Chemical Composition

Bearing steel has carbon content in the range of 0.55 to 1.10 percent, manganese, silicon, phosphorus and sulfur up to a maximum of 0.03 percent and chromium in the range of 0.5 to 2.0 percent. The remaining percent is iron. The chemical properties determine the anti-corrosive properties of the bearing steel. The chemical composition of the steel also dictates its mechanical and physical properties such as the strength and hardness, toughness and brittleness and ductility and malleability.

Hardness

Bearing steel has enormous hardness. A minimum expected hardness for bearing components is 58 Rc Bearing steel has a bending strength of 2400 MPa (Pascal Unit) and can withstand high stress and centrifugal forces. But it has a low corrosion resistance.
Carbon increases the strength of bearing steel. Strength ensures that parts (i.e., bearings) made from it do not deform on the application of stress and load. Ductility and weldability, however, decrease with increasing carbon content. In addition to this, bearing steel is designed to have high fatigue strength and life and needs to respond uniformly to the heat treatment process. It should have a compact structure with a consistent grain flow and a fine grain size that imparts high impact toughness to the alloy.

Physical Properties

Bearing steel is magnetic in nature and is a good thermal and electrical conductor.
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