Commercial Production · Alloy Steel · Nickel-Molybdenum Case-Hardening Steel Bar

4620 Round Steel Bar

A nickel-molybdenum alloy chosen for carburized gears and components that need a hard case and tough interior.

Purchase to your specification

4620 for production and repeat supply.

Buying 4620 for machining, forging, or component production? Send your dimensions, condition, and quantity per order. For repeat supply, include annual usage and release timing, or attach your existing RFQ.

Size & supply condition: State the diameter, length, and required condition. We confirm the available supply route against your order.
Finished to your requirement: Include production cutting, surface finish, tolerances, and any required heat treatment. Processing is reviewed with the material requirement.
Documentation & delivery: Specify mill certifications, testing, traceability, delivery date, and ship-to location so they can be included in the quote.

A grade name is the starting point. The governing specification, condition, dimensions, and testing define the material to be quoted.

Read the 4620 material profile ↓

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Your 4620 requirement

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Quantity / WeightCommercial requirements from 3,000 lb through truckload quantities.

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4620 Round Bar: Material Profile

4620 provides greater core carbon than 4615 while maintaining the case-hardening and toughness benefits of the 46XX family.

The intended section size, carburizing practice, case requirements, and final mechanical properties guide supply selection.

Purchase to the controlling ASTM, SAE, AMS, or customer specification. Section size, supply condition, mechanical properties, surface limits, testing, and heat/lot traceability can change the acceptable material and processing route.

Key Characteristics

Excellent carburizing response
Good core toughness
Good hardenability
Good impact resistance

Common Applications

Transmission gears
Pinions and shafts
Heavy-duty bushings
Powertrain components

Specification Requirements

Identify the governing specification and revision, product form, section size, condition, mechanical properties, testing, and certification requirements. The purchase specification and material certification govern the order.