AISI 4118H Alloy Steel Chemical Composition, Grades, Table and Online Pdf

AISI 4118H is a low carbon and relatively molybdenum containing alloy steel renowned for its exceptionally high strength and toughness properties. It puffs the gas and its chemical composition usually contains elements such as carbon, manganese, phosphorus, sulfur, silicon, chromium, molybdenum and in some cases, nickel. The precise formulation may include different additives or elements, or it can be designed per the manufacturer specifications and desired specifications for a particular application. AISI 4118H is frequently used to prepare gears, shafts, high strength components as well as internal and external parts, which require outstanding wearability and endurance for fatigue. Engineers and metallurgists often use detailed tables, chart, pdf and website information as their guides, looking for complete data on AISI 4118H steel alloys, grades, composition variations, mechanical properties, and processing guidelines, which aid the intelligent choice of materials.

AISI 4118H Alloy Steel Chemical Composition And Grade Table

AISI 4118H is a famous low carbon steel alloy, it stands out from other alloys because of its really great combination of strength, toughness, and wear resistance. Its main components the content of which is the carbon, manganese, chromium and molybdenum are chemical More often than not, this type of material is utilized in settings which require high strength and resistance, among others, gears, shafts and auto parts. Its capabilities are completely reliable of working under tough environmental and working conditions. It meets the requirement of the industry to have the accurately balanced, rules including all standards and grades, for producing products consistently and at a good quality. The Table below indicates the typical chemical composition of steel AISI 4118H alloy.

AISI 4118H Alloy Steel Composition Table
Elements Si Mn C Cr Mo P S Fe
Min (%) 0.15 0.7 0.18 0.4 0.08 - - -
Max (%) 0.35 0.9 0.23 0.6 0.15 ≤0.035 ≤0.040 Balance

Advantages and Disadvantages of AISI 4118H Alloy Steel

    Advantages:

  • High Hardenability: Has enhanced hardenability compared to standard 4118 steel.

  • Enhanced Strength: Develops better strength properties, particularly under hardened condition.

  • Improved Toughness: Exhibits better toughness for applications requiring high toughness levels.

  • Fatigue Resistance: Shows good resistance against fatigue failure.

    Disadvantages:

  • Increased Cost: Higher costs associated with elements incorporated and heat treatments.

  • Weldability Concerns: May have lower weldability than non-hardenable steels.

  • Machining Difficulty: Although easier to machine than some materials due to higher hardness.

  • Susceptibility to Decarburization: Prone to surface decarburization during heat treatments.

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