AISI 8620H Alloy Steel

 

 

Chemical Composition:

 

Carbon (C): 0.17 - 0.23%

Silicon (Si): 0.15 - 0.35%

Manganese (Mn): 0.60 - 0.95%

Sulfur (S): ≤ 0.015%

Phosphorus (P): ≤ 0.025%

Chromium (Cr): 0.35 - 0.65%

Nickel (Ni): 0.35 - 0.75%

Copper (Cu): ≤ 0.30%

Molybdenum (Mo): 0.15 - 0.25%

 

Mechanical Properties:

 

Tensile Strength (σb): ≥ 1176 MPa (120 ksi)

Elongation (δ5): ≥ 9%

Reduction of Area (ψ): ≥ 45%

Impact Toughness Value (αkv): ≥ 78 J/cm² (8)

 

Heat Treatment Process:

 

Annealing: Heat to 820°C - 850°C, hold for a sufficient time to ensure the steel is fully heated, and then cool in the furnace. This process helps to refine the microstructure, improve ductility, and reduce hardness, making it easier for subsequent processing.

Normalizing: Can be carried out at a similar temperature range as annealing. Normalizing refines the grain structure and improves the uniformity of the material, enhancing its mechanical properties and stability.

Carburizing: Usually done at a temperature of 900 - 920°C. It involves introducing carbon into the surface of the steel to increase its carbon content and hardenability. After carburizing, the steel is typically quenched in oil or water to obtain a hardened surface layer.

Quenching: For AISI 8620H, quenching is often carried out at a temperature around 880°C ± 20°C for the first time and 790°C ± 20°C for the second time, followed by oil cooling. Quenching rapidly cools the steel to form a martensitic structure, which imparts high hardness and strength to the material.

Tempering: Conducted after quenching, usually at a temperature range of 150 - 200°C. Tempering helps to reduce the brittleness caused by quenching, adjust the hardness and toughness balance, and improve the material's impact resistance and stability.

 

The specific heat treatment process parameters may vary depending on the actual requirements and the specific composition and condition of the steel. Appropriate heat treatment can significantly improve the performance and service life of AISI 8620H Alloy Steel, making it suitable for applications such as gears, bearings, shafts, and other mechanical parts that require high strength, wear resistance, and toughness, especially in the automotive, machinery, and aerospace industries.

 

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