8620 Steel

What is 8620 Steel and Why Is It So Popular in Manufacturing?

8620 steel is a low-alloy, nickel-chromium-molybdenum steel prized for its ductility, toughness, wear resistance, and hardenability. The nickel content provides excellent toughness and impact strength, while chromium and molybdenum enhance surface hardness and resistance to wear, making it a go-to material for high-performance applications.

Why 8620 Steel Stands Out

Ductility & Toughness – Nickel improves resilience under heavy stress and shock loads.
Wear Resistance – Chromium increases hardness and durability, even in abrasive environments.
Hardenability – Molybdenum enables deep hardening, extending the service life of critical components.
Versatility – Performs consistently across a wide range of industries.

Applications of 8620 Steel

Thanks to its mechanical properties, 8620 bar stock is widely used in industries that demand both strength and toughness. Common applications include:

Gears, shafts, and crankshafts
Automotive and aerospace components
Heavy machinery and mining equipment
Oil drilling rigs and energy sector parts
Defense and high-stress industrial equipment

At Mozaic Precision Metals, we supply precision-ground 8620 steel bar stock tailored to your specifications—delivering the toughness, accuracy, and reliability required for the most demanding manufacturing applications.

High External Strength, Good Internal Strength: 8620 Round Bar

8620 alloy steel round bar is a low-carbon, nickel-chromium-molybdenum alloy widely valued for its excellent combination of toughness, machinability, and wear resistance. Known for its balance of a hard, wear-resistant outer case and a soft, ductile core, 8620 steel is a top choice for parts requiring both durability and reliability under high-stress conditions.

Key Benefits of 8620 Alloy Steel

High Strength-to-Weight Ratio: Provides outstanding mechanical performance without adding excessive weight.
Excellent Machinability: Easily machined into complex shapes, reducing production time and costs.
Good Weldability: Low carbon content makes it easier to weld compared to many other alloy steels.
Wear Resistance: Carburizing produces a tough outer surface with excellent resistance to abrasion and wear.
Durability: Combines surface hardness with internal ductility for long service life under heavy loads.

Applications of 8620 Round Bar

Due to its superior combination of strength, toughness, and machinability, 8620 steel is widely used across industries such as automotive, construction, oil & gas, and general manufacturing. Common applications include:

Gears and pinions
Axles and shafts
Bolts, screws, and fasteners
Couplings and spindles
Structural supports and heavy machinery parts

Heat Treatment & Hardening

8620 steel responds well to carburizing, resulting in a hard external case with a ductile, shock-resistant core. This makes it ideal for components subject to friction, impact, or heavy wear. It also performs well in polishing and finishing operations. While it does not respond effectively to induction hardening due to its low carbon content, nitriding can be used to further enhance its surface hardness.

8620 Steel from Mozaic Precision Metals

At Mozaic Precision Metals, we supply premium 8620 alloy steel round bars manufactured to precise tolerances and superior surface finishes. Our products are trusted by industries that demand reliability, machinability, and long-lasting performance.

With over 60 years of combined expertise in precision grinding, our leadership team ensures each order meets the highest quality standards. Whether you need small-batch supply or large-volume orders, Mozaic Precision Metals provides steel solutions tailored to your application.

Contact us today to request a quote for 8620 round bar and discover why manufacturers nationwide trust Mozaic Precision Metals for precision-ground alloy steel.

Why 8620 Steel is the Go-To Material for Tough and Resilient Gear Applications

When it comes to manufacturing gears for high-stress applications, 8620 steel round bar is one of the most trusted materials. Known for its balance of strength, toughness, and machinability, 8620 steel is engineered to deliver outstanding performance and long-lasting reliability in demanding environments.

Chemical Composition of 8620 Steel

8620 alloy steel is a low-alloy grade containing a precise blend of chromium, molybdenum, and nickel. These alloying elements improve hardenability, tensile strength, and wear resistance. Its relatively low carbon content provides excellent weldability and machinability while allowing for effective carburizing to create a hard, wear-resistant surface with a tough, ductile core.

Key Properties of 8620 Steel Round Bar

High Strength & Toughness: Capable of withstanding heavy loads, shocks, and impacts without compromising durability.
Superior Wear Resistance: Resists abrasion, extending the service life of precision-machined gears.
Excellent Hardness: Responds well to heat treatment and carburizing, creating a strong case-hardened surface with a resilient core.
Good Machinability & Weldability: Easier to machine and fabricate compared to many other alloy steels.

Applications of 8620 Steel in Gear Manufacturing

Thanks to its strength and resilience, 8620 alloy steel is widely used in gear production across multiple industries:

Automotive: Transmission gears, axles, and differentials for cars, trucks, and off-road vehicles.
Heavy Machinery: Industrial gearboxes, excavators, tractors, and agricultural equipment.
Aerospace: Engine gears, landing gear systems, and flight control mechanisms requiring strength under extreme stress.

8620 Round Bar from Mozaic Precision Metals

At Mozaic Precision Metals, we supply precision-ground 8620 steel round bars manufactured to meet the highest industry standards. Every bar is carefully tested, analyzed, and finished to ensure superior performance in gear manufacturing and other high-stress applications.

With over 60 years of combined expertise in precision grinding, our leadership team ensures that every order delivers the toughness, accuracy, and reliability that industries demand. From automotive to aerospace, we are the trusted partner for high-quality alloy steel supply.

Contact us today to request a quote and secure premium-grade 8620 round bar stock for your next gear manufacturing project.