Alloy Steel 8620

Alloy steel 8620 is a low-alloy steel containing nickel, chromium, and molybdenum with high strength and toughness. It is a commonly used steel that can be carburized.

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Alloy steel valve cage machined part close-up

G86200
1.6523

530 MPa

Ultimate Tensile Strength
385 MPa

Yield Strength
205 GPa

Young's Modulus(Elasticity)
20 %

Elongation at Break

At a Glance

Material Type
Metal
Material Name
Alloy Steel 8620
Alternative Names
G86200 | 1.6523
Process Compatibility
CNC Milling, CNC Turning

Properties Table of Alloy Steel 8620

Properties

Ultimate Tensile Strength 530 MPa(77,000 psi)
Yield Strength 385 MPa(55,800 psi)
Young's Modulus(Elasticity) 205 GPa(29,700 ksi)
Elongation at Break 20%
Physical Properties
Corrosion Resistance Moderate corrosion resistance, susceptible to corrosion in certain environments
Magnetism Ferromagnetic
UV Resistance Limited UV resistance
Weldability Good weldability with proper pre-weld and post-weld procedures
Thermal Properties
Maximum Service Temperature Approximately 500°C(932°F)
Thermal Expansion Coefficient 11.7 x 10^-6/°C(20-100°C)
Thermal Conductivity 46.6 W/m·K(20°C)
Electrical Properties
Electrical Resistivity ~7.6 x 10^-7 ohm.m
ESD Safety Conductive

Applications of Alloy Steel 8620

Gears for automotive and industrial machinery
Camshafts in engine systems
Axles for automotive and machinery
Fasteners such as bolts and nuts
Aircraft parts requiring high strength and toughness
Forged components that require good hardenability and strength

Advantages of Alloy Steel 8620

Excellent hardenability
High strength and toughness
Versatility for various applications
Suitable for gears, crankshafts, and heavy-duty machinery components
Case-hardening ability enhances wear resistance
Durable performance in demanding conditions

Raw Stock

CNC Machined

Finished Parts

Alloy Steel 8620 — Machining Notes

Alloy Steel 8620 in CNC
is Alloy Steel 8620?

Alloy Steel 8620 in CNC Machining

Alloy steel 8620 is a low-alloy steel containing nickel, chromium, and molybdenum with high strength and toughness. It is a commonly used steel that can be carburized.

We offer Alloy 8620 in various forms, such as bars, tubes, and plates. It has a hard outer layer and a durable, ductile core that undergoes minimal distortion during heat treatment. It is flexible during hardening, allowing for the enhancement of case/core properties. When CNC machining Alloy Steel 8620, we consider cutting speeds, feeds, and tool materials. Carbide tools are often preferred for their durability. Proper lubrication during machining helps improve surface finish and tool life.

Alloy steel 8620 is improved through heat treatments. We can forge it quickly and then normalize it for better machining. We can also fully anneal it before machining, followed by case hardening and immediate tempering. Tempering at 150℃ – 200℃ enhances toughness without much impact on strength. For carburizing, we heat at 900℃ – 925℃ and follow with a tailored hardening and tempering cycle for optimal properties.

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What is Alloy Steel 8620?

Alloy Steel 8620 is a carburizing alloy with excellent hardenability and case-hardening properties. It is composed of around 0.2-0.5% carbon, 0.5-0.7% manganese, 0.4-0.7% chromium, 0.4-0.6% molybdenum, and 0.4-0.7% nickel. Its low carbon content makes it suitable for welding.

The nickel content enhances toughness, while chromium and molybdenum contribute to its wear resistance and strength. It is widely used in various industries because of its cost-effectiveness and superior quality.

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FAQ

What is the difference between 4140 and 8620 steel?

4140 alloy steel and 8620 steel differ in carbon content, with 8620 having slightly less and containing nickel. Both share similar amounts of chromium and molybdenum. 8620 steel is well-suited for carburization case hardening.

What do you weld 8620 with?

When welding 8620 using TIG, consider using "oxweld" or ER 70S-2. The CNC'd "teeth" aid alignment, reducing the needed heat input during welding. Welding 8620 steel typically requires preheating and post-weld heat treatment to minimize the risk of cracking. Gas tungsten arc welding (GTAW) or shielded metal arc welding (SMAW) with appropriate filler materials can also be used.

What are common heat treatments for 8620 alloy steel?

Typical heat treatments for 8620 include normalizing, annealing, and case hardening processes like carburizing and hardening.