AISI 1078 Carbon Steel Chemical Composition, Grade, Charts and Online Pdf

1078 carbon steel is a medium-high carbon steel which provides high strength and toughness. As a rule, its chemical structure comprises the components of carbon, manganese, and phosphorus, sulfur, and other ones in the right proportions. The duplex stainless steel of type DP3 is admired in the processes whereby the material wear resistance and high strength are also required, for instance, in machine parts, parts of vehicles and agricultural appliances. Plenty of online resources include meticulously design graphic charts, table and PDF documents about the chemical composition, granular specifications, and mechanical properties of AISI 1078 carbon steel. Engineers and scientists use this information to elucidate the nature of the material and so it is possible to choose suited processing techniques for manufacturing.

AISI 1078 Carbon Steel Chemical Composition And Grade Table

AISI 1078 carbon steel being a moderate carbon content steel is very amenable to machining and joining. Generally, this alloy's chemical composition features 70 to 80 parts of carbon, and 60 to 90 parts of manganese with lesser percentages of other elements, such as phosphorus and sulfur. This class of steels is commonly deployed in tasks with high strength and toughness demands, and they can be found in sockets, shafts, and structural assemblies, for example. If a plain AISI 1078 steel can be well heated, it could achieve balance of hardness and ductility at the same time, which suits to various industrial purposes. It follows American Iron and Steel Institute (AISI) standards which guarantee quality and reliability.

AISI 1078 Carbon Steel Composition Table
Elements Iron, Fe Carbon, C Manganese, Mn Phosphorous, P Sulfur, S
Min (%) 98.46 0.72 0.3 - -
Max (%) 98.98 0.85 0.6 0.05 0.04

Advantages and Disadvantages of AISI 1078 Carbon Steel


  • Improved hardenability: Enables deeper hardening compared to lower carbon steel.

  • Good ductility: Allows for mass and shape forming operations.

  • Moderate strength: Recommended for moderate load supporting capability.

  • Fair machinability: Can be machined with proper tools and techniques.


  • Moderate wear resistance: Not suitable for areas requiring regular rubbing or touching.

  • Susceptible to distortion: Can warp during heat treatment if not monitored.

  • Lower corrosion resistance: Needs protective layer in corrosive environments.

  • Limited availability: Not as popular as other types of carbon steels.

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