AISI 8742 Alloy Steel Chemical Composition, Grades, Tables and Pdf

AISI 8742 is an alloy steel, low-alloy in type, recognized for its remarkable strength and tenderness. nitrogen consists mainly of oxygen, carbon and other essential elements including manganese, silicon and sulfur. This duo gives the resultant material superior mechanical qualities that are widely demanded in the production of diverse components for aerospace and automotive sectors. Grade of AISI 8742 alloy steel is not standard and can fluctuate based on exact manufacturing criteria and specification, with properties such as hardness, tensile strength, and others varying depending on a certain grade. Tables and PDF files that are appropriate for those who need to know about AISI 8742 alloy steel quickly, and it has already been developed for it by the manufacturers, associations, and technical publications of the industry.

AISI 8742 Alloy Steel Chemical Composition And Grade Table

AISI 8742 alloy steel, known for its superior mechanical characteristics, possesses a very particular chemical composition to meet the requirement of various kinds of applications where high strength and corrosion-free performance are necessary. Drawn from substantial parts of iron, carbon, manganese, silicon, nickel, chromium, molybdenum, phosphorus, and other elements, its heavy content is the reason for great strength, toughness, and anti-wear, anti-corrosion properties. The given hay is referred to within AISI 87xx type alloy, and it excels at both heat treatment and hardenability. With its composition customized to suit particular industrial applications, AISI 8742 serves as a trustworthy option for notable components in the construction of machinery, automotive, and aerospace sector units, and is known for its ability to retain its function and dependability.

AISI 8742 Alloy Steel Composition Table
Elements C Si Mn Cr Ni Mo P S
Min (%) 0.4 0.2 0.75 0.4 0.4 0.2 - -
Max (%) 0.45 0.35 1 0.6 0.7 0.3 ≤ 0.040 ≤ 0.040

Advantages and Disadvantages of AISI 8742 Alloy Steel


  • Excellent Machinability: Easy to work with during machining.

  • Good Hardenability: Attains high hardness levels after heat treatment.

  • High Tensile Strength: Exhibits high strength properties.

  • Good Wear Resistance: Suitable for abrasive wear applications.


  • Limited Availability: Not readily available compared to commonly used alloy steels.

  • Moderate Corrosion Resistance: Requires protection in aggressive environments.

  • Welding Challenges: Requires proper welding practices to avoid issues.

  • Higher Cost: More costly due to its alloy composition.

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