AISI 4118 Alloy Steel Chemical Properties, Grades, Tables and Pdf

AISI 4118 is a low carbon alloy steel which has an excellent strength, toughness, and wear enough to survive the harsh conditions. Its chemical formula, (C,Mn,Si,Cr,Mo), emphasizes the fact that it is made from a wide variety of materials and it comes with incredible abilities suitable for a broad range of industrial uses. Modified grades of AISI 4118 are divided between the heat treatment conditions and mechanical properties. Grades that are used most usually are ASTM A29 A4118 and ASTM A322 A4118. Showing Tables indicating its mechanical properties like tensile strength, yield strength, and elongation, for easy reference is instantly accessible. The process of material selection and process optimization for the profound application in the manufacturing of parts used in automotive, aerospace and machinery is often facilitated by a PDF file that contains all the complete information on the AISI 4118 alloy.

AISI 4118 Alloy Steel Chemical Composition And Grade Table

AISI 4118 is a low carbon, steel chromium-molybdenum alloy with these characteristics that makes it the suitable grade for heavy machinery applications. The structure of this high-carbon steel is provided by its chemical content: manganese, phosphorus, sulfur, silicon, chromium, and molybdenum are all part of the equipment. Mostly, AISI 4118 is supplied for those areas that need goods characterised by high tensile strength, and ease of welding alongside, getting good service in various conditions. This alloy steel belongs to the family of material widely used in production of sprockets, shafes and other components in the car, aircraft and machine manufacturing industries, respectively. With suitable heat treatments it may develop the required mechanical properties, resulting in the fact that it can be used in a broad range of engineering applications.

AISI 4118 Alloy Steel Composition Table
Elements Iron, Fe Manganese, Mn Chromium, Cr Carbon, C Silicon, Si Molybdenum, Mo Sulfur, S Phosphorous, P
Min (%) 97.7 0.7 0.4 0.18 0.15 0.08 - -
Max (%) 98.49 0.9 0.6 0.23 0.35 0.15 0.04 0.035

Advantages and Disadvantages of AISI 4118 Alloy Steel


  • Heat Treatable: Can be upgraded by heat treatment to alter properties.

  • Good Weldability: Use is possible in welding actions with proper precautions.

  • High Strength: Exhibits high tensile strength, further enhanced by heat treatment.

  • Wear Resistance: Provides reasonable protection against wear and abrasion.


  • Limited Hardenability: Not as easy to harden as some other alloy steels.

  • Susceptible to Corrosion: May corrode if exposed to extreme conditions without protection.

  • Machining Challenges: Can generate difficulties during the metallic turning process.

  • Cost: More expensive than some other types of carbon steel.

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