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Common Alloy Structural Steel Grade and Chemical Composition Table 2
AISI/SAE 8620
AISI/SAE 8620 is a common low-alloy steel that contains chromium to give it extra strength, durability and corrosion resistance. It is frequently used in the manufacturing of auto parts and various components in the aerospace and oil and gas industries. The addition of chromium gives the 8620 alloy the capability to resist stress corrosion, carburization and oxidation.
Chemical Composition
The chemical composition of the AISI/SAE 8620 alloy is outlined in the following table.
Element Content
Carbon 0.18 - 0.23%
Manganese 0.70 - 0.90%
Phosphorus 0.035% max
Sulfur 0.040% max
Silicon 0.15 - 0.30%
Chromium 0.40 - 0.60%
Molybdenum 0.15 - 0.25%
Nickel 0.30% max
Copper 0.25% max
Vanadium 0.12% max
Mechanical Properties
The AISI/SAE 8620 alloy has a range of mechanical properties that are affected by its composition and by the process of heat treating. Its ultimate tensile strength ranges from 415-2200 MPa (60-320 ksi), and it has good toughness and ductility properties.
Applications
AISI/SAE 8620 steel is ideal for use in applications where strength and durability are a top priority. It is commonly used in auto parts such as axles, camshafts, connecting rods and gears. Additionally, the 8620 alloy is used in the oil and gas industries for critical infrastructure components that are exposed to atmospheric corrosion, such as drill collars and down hole tooling. In the aerospace industry, it is used for landing gear components and other highly stressed parts.
