Rolling bearing steel
April 25, 2019
Rolling bearing steel is a steel used to manufacture rolling elements and inner outer rings of rolling bearings, and is usually used in a quenched state. Rolling bearings are subjected to high alternating loads during operation, and the contact stress between the rolling elements and the inner and outer rings is large, and at the same time they work in the lubricant medium. Therefore, the rolling bearing steel has high compressive strength and fatigue strength, and has certain toughness, plasticity, wear resistance and corrosion resistance. The internal structure and composition of the steel are uniform, and the dimensional stability after heat treatment is good. The commonly used rolling bearing steel is a high carbon low chromium bearing steel with a carbon content of 0.95% to 1.10% and a chromium content of 0.40% to 1.60%, such as GCr6, GCr9, GCr15, and the like.
In order to meet the requirements of the bearing under different working conditions, special-purpose bearing steels have been developed, such as impact-resistant carburized bearing steel for rolling mill bearings, high-temperature bearing steel for aerospace engine bearings and working in corrosive media. Stainless bearing steel, etc.
Heat treatment process and heat treatment of GCr15 bearing steel
Spheroidizing or softening annealing. The aim is to reduce hardness, uniform organization, improve machinability and prepare for quenching. It is mainly used for eutectoid steel and hypereutectoid steel (carbon content greater than 0.77%) such as carbon tool steel, alloy spring steel, rolling bearing steel and alloy tool steel.
How to make bearing steel
1, lower billet, 2, forging, stamping (outer ring, inner ring) 3, machining (outer ring, inner ring) 4, heat treatment 5, fine grinding (outer ring, inner ring forming)
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