Common materials of sprocket and hardness of tooth surface

Material: 15, 20

Heat treatment: carburizing, quenching, tempering

Hardness after heat treatment: 50 ～ 60HRC

Application range: Z≤25, master and driven sprocket with impact load

Material: 35

Heat treatment: normalizing

Hardness after heat treatment: 160 ～ 200HBS

Application range: Under normal working conditions, sprocket with many teeth (Z≤25)

Material: 40, 45, 50

Heat treatment: quenching, tempering

Hardness after heat treatment: 40 ～ 50HRC

Application range: sprocket without severe vibration and shock

Material: 15Cr, 20Cr

Heat treatment: carburizing, quenching, tempering

Hardness after heat treatment: 50 ～ 60HRC

Application range: important sprocket with dynamic load and large power transmission (Z≤25)

Material: 35SiMn, 40Cr, 35CrMo

Heat treatment: quenching, tempering

Hardness after heat treatment: 40 ～ 50HRC

Application range: Use high-quality chain, important sprocket

Material: Q235, Q275

Heat treatment: post-weld annealing

Hardness after heat treatment: 140HBS

Application range: large sprocket with medium speed and medium power

Material: ordinary gray cast iron (not lower than HT150)

Heat treatment: quenching, tempering

Hardness after heat treatment: 260 ～ 280HBS

Application range: Z2> 50 driven sprocket

Material: Bakelite with cloth

Application range: sprocket with power less than 6KW, high speed, stable transmission and low noise required.