8620 Steel: Carburized Gears and Pins

8620 is a nickel-chromium-molybdenum alloy steel commonly specified for case-hardening work. Material reference.

Carburized Gears and Pins

Define a hard wearing surface separately from the core needed to support it. For a carburized pin, the final grinding allowance matters because it changes the remaining case; for a gear, distortion can change the finishing route and inspection cost.

Manufacturing and acceptance checks

Put effective case depth, core requirements and final surface hardness on the enquiry. Identify masking, thread protection and the stage at which case depth is measured. If 9310 is proposed, require a technical comparison for the same geometry and load before changing the grade.

Compare related options

• 9310 Steel
• 20CrMnTi Steel

Reference and scope

Alro: metals product and specification guide provides material or specification background. The checks above are purchasing guidance; final acceptance values must come from the agreed grade, product specification and condition.

Send a drawing and material requirements for review. Include quantity, critical dimensions and the inspection evidence required with delivery.