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

4615 Round Steel Bar

A low-carbon nickel-molybdenum alloy used for carburized parts requiring toughness and a durable wearing surface.

Purchase to your specification

4615 for production and repeat supply.

Buying 4615 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 4615 material profile ↓

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4615 Round Bar: Material Profile

4615 is intended for case-hardened components where nickel supports toughness and molybdenum improves hardenability.

Include the required case depth, surface hardness, core properties, bar condition, and governing material specification.

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

Good case-hardening response
Tough core
Good fatigue resistance
Machinable before carburizing

Common Applications

Gears and pinions
Bushings and sleeves
Small shafts
Case-hardened transmission parts

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.