Round steel link chain making for 30+ years
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SHANGHAI CHIGONG INDUSTRIAL CO., LTD

(round steel link chain manufacturer)

What is The Hardening Process of Round Link Conveyor Chain Sprocket?

Conveyor chain sprocket teeth can be hardened by means of the flame or induction hardening.

The chain sprocket hardening results obtained from both methods are very similar, and the choice of either method depends on equipment availability, batch sizes, sprocket size (pitch) and product geometry (bore size, holes in the heat affected zone and keyways).

Hardening teeth substantially increases conveyor chain sprocket life and is recommended for long term conveying application particularly where abrasion is an issue.

Degree of hardness

This is initially determined by the steel material used to manufacture the chain sprocket but hardness levels may be reduced by subsequent tempering to meet specified levels.

The majority of conveyor chain sprockets are made from C45 casting which contains 0.45% carbon. The case hardened teeth hardness of this material is 45-55 HRC and it may be tempered back to any specified hardness level below this.

If the application requires the chain sprocket to wear preferentially to the round link chain the hardness level specified for the sprocket would be 5-10 HRC points lower than the round link chain. A typical chain sprocket hardness specified for this type of application is 35-40 HRC.

Case hardness depth

1.5 – 2.0 mm is typical hardness depth however deeper cases may be obtained for special applications.

Chain Sprocket Hardened Area

The critical area to harden is the sprocket teeth surface with contact with chain links. This varies depending on the sprocket teeth type however typically it is the concave area of the sprocket tooth (i.e., pocket teeth sprocket) where the chain links contact the tooth. The root of the tooth is theoretically not subject to wear and does not need hardening however it is usually hardened as part of either process (flame or induction). When a conveyor chain sprocket has extended pitch line clearance or relief in this area it is not necessary to harden this section of the tooth.

Post time: Mar-16-2023

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