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Worm gear reducer requires not only strength requirements, but also good running, wear and wear resistance.
The worm is usually made of carbon steel or alloy steel. For less important transmissions and low-speed medium-load worms, 40 or 45 steels are often tempered or normalized, 220~230HBS; for high-speed heavy-duty worms, 150.5, 20Cr, 20CrMnTi and 20MnVB are used for precision carburizing. Quenching, 56~63RHC, can also be surface-quenched with 40, 45, 40Cr, 40CrNi, 45~50HRC.
Worm materials such as planetary reducers are usually manufactured using cast iron HT150, HT200, or the like.
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Common materials for worm gear reducer