AISI 4620H Alloy Steel Chemical Properties, Grade, Table and Document

Alloy steel AISI 4620H is low carbon steels with case hardening and comprises of nickel and molybdenum with superior strength, toughness and wear resistance. Generally, there are usually elements like carbon, manganese, chromium, nickel, molybdenum, and silica featured in the chemical makeup of tool steels. Machinable and welding rigidity of solid surfaces belongs to the most valuable properties of the material that can be marked across the range of 220-260 HB. MPI4620H is most often used where high surface hardness is demanded, as in gears, spindles, and camshafts. It performs better under high shearing conditions and resistance to impact. Formalities in chemical characteristics, numeration and tables are elaborated in Technical specifications generated by application societies like the ASTM and SAE, in which these societies give their standards for the composition, mechanical properties and the heat treatment procedures.

AISI 4620H Alloy Steel Chemical Composition And Grade Table

AISI 4620H alloy steel is famed for its great performance on strength and hardenability which indicates to its multifunctionality towards applications in for example the automotive, aerospace, and the engineering industry. To vary the chemical formula depending on the application, one generally use elements of carbon, manganese, chromium, molybdenum and nickel and the correct proportion guarantees the desired mechanical properties. The AISI 4620H duct is covered by the composition table and its technical properties which are subject to scrutiny by engineers and manufacturers alike to form material selection and processing decisions. This alloy shows good welding properties and machining, what makes it usable and widespread among engineering applications.

AISI 4620H Alloy Steel Composition Table
Elements Iron, Fe Nickel, Ni Manganese, Mn Molybdenum, Mo Carbon, C Silicon, Si Sulfur, S Phosphorous, P
Min (%) 96.295 1.55 0.35 0.2 0.17 0.15 - -
Max (%) 97.58 2 0.75 0.3 0.23 0.35 ≤0.040 ≤0.035

Advantages and Disadvantages of AISI 4620H Alloy Steel


  • Heat Treatable: Can be heat treated to improve hardness and strength.

  • Good Machinability: Favorable machinability compared to other alloys.

  • Good Wear Resistance: High endurance in harsh wear and abrasion conditions.

  • Moderate Toughness: Provides balanced hardness with adequate toughness.


  • Limited Weldability: Cumbersome to weld due to alloying elements.

  • Cost: Higher cost compared to standard carbon steels.

  • Surface Sensitivity: Prone to surface breaking if mishandled during processing.

  • Complex Heat Treatment: Requires precise heat treatment for desired properties.

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