Commonly used materials and heat treatment methods for gears
Commonly used gear materials are various grades of high-quality carbon structural steel, alloy structural steel, cast steel, cast iron, and non-metallic materials. Generally use forging or rolled steel. When the size of the gear structure is large and the wheel blank is not easy to forge, cast steel can be used; for open low-speed transmission, gray cast iron or ductile iron can be used. Steels with better comprehensive performance should be selected; high-speed gears are prone to pitting on the tooth surface, and materials with high tooth surface hardness should be selected; gears subject to impact load should be selected from materials with good toughness. For high-speed, light-load and low-noise gear transmissions, non-metallic materials, such as cloth bakelite, nylon, etc. can also be used. Commonly used gear materials and their mechanical properties are listed in the table below.
