AISI 8655 Alloy Steel Chemical Composition, Grade, Tables and Pdf

The AISI 8655 is a low-alloy steel that is famous for its excellent strength, toughness, wear-resistance, which make it the first element in the applications that are used in industries like automotive, aerospace, and machinery. In its chemical make-up elements such as carbon, manganese, silicon, nickel, chromium and molybdenum, although selected in their exact proportions, are employed to reach the desired properties. The grade tables describe a grade of steel in detail, such as its mechanical properties and heat treatment in order to be better applied. These tables are always the industrialists' reference point while developers and manufacturers always have the tables, chart and PDFs to double check that the material selection and processing techniques have been done perfectly for the products to last longer without exhibiting any deviations in the performance. Accessible resources promote informed decision-making, and the smooth production process across several industries is made possible through these resources.

AISI 8655 Alloy Steel Chemical Composition And Grade Table

The steel with AISI 8655 alloy brand is a low-alloy steel for its exceptional toughness performance and strength that is ideal for several industrial uses. Usually, its chemical structure is made of contunious carbon, manganese, silicon, and phosphorus, sulfur, chromium, molybdenum and sometimes nickel. The composition of mix used may slightly differ depending upon the manufacturer or standards of the project. This alloy has a numbering under the Unified Numbering System (UNS) G86550 if we looking to the grades. This material is usually applied for the parts requiring the accuracy high strength and wear resistance (e.g. gears, shafts, and cars parts).

AISI 8655 Alloy Steel Composition Table
Elements Iron (Fe) Manganese (Mn) Carbon (C) Nickel (Ni) Chromium (Cr) Silicon (Si) Molybdenum (Mo) Sulfur (S) Phosphorus (P)
Min (%) 96.4 0.75 0.51 0.4 0.4 0.15 0.15 - -
Max (%) 97.6 1 0.59 0.7 0.6 0.35 0.25 0.04 0.035

Advantages and Disadvantages of AISI 8655 Alloy Steel


  • High Strength and Toughness: Provides superior tensile strength, yield strength, elongation, and creep resistance.

  • Good Fatigue Resistance: Resistant to fatigue failure under cyclic loading.

  • Machinability: Can be machined easily in annealed state; harder conditions are also manageable.

  • Weldability: Generally weldable using common welding methods.


  • Cost: Relatively higher cost compared to ordinary carbon steels.

  • Limited Hardenability: May not achieve fine grain size and profound hardening in thick sections.

  • Corrosion Resistance: Requires barrier protection like painting or coating for use in corrosive environments.

  • Brittleness: May become brittle if heat treated improperly.

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