AISI 4142 Alloy Steel Chemical Composition, Grade, Table and Pdf

The AISI 4142 material is a medium alloyed steel which offers good strength and toughness. The predominant chemical composition of this category usually comprises of carbon, manganese, chromium, molybdenum and other elements in a small proportion. The grade is mostly used in the parts where high tension strength, wear resistance, engineered rods and other components of car industry, machinery, fossil fuel power plants, chemical industry and oil/gas industry would be focused on. The composition, therefore, will have the typical range of 0.40-0.45% carbon, 0.75-1.00% manganese, 0.90-1.20% chromium, and 0.20-0.30% molybdenum. The tables chart,pdf which describe the content, properties, and application of AISI 4142, can be freely obtained from reliable sources such as steel manufacturers and engineering organizations, to help the process of choosing the correct material and engineering design.

AISI 4142 Alloy Steel Chemical Composition And Grade Table

AISI 4142 is a combination of chromium-molybdenum alloy steel which is famous for its superior toughness and strength properties. Classified mainly from the carbon (C), manganese (Mn), molybdenum (Mo), manganese (Mn) and silicon (Si) as main component along with of chromium (Cr) and phosphorus (P), and sulfur (S) is the chemical composition. Grade tables of AISI 4142 reveal variations of designs including chemical properties and mechanical characteristics like hardness, yield strength, and tensile strengths, which are as a result of various heat treatment techniques. These tables are key references for engineers and manufacturers in the process of choosing the grade of AISI 4142 alloy steel that is applicable to a particular application and, therefore, ensures the best functionality and durability.

AISI 4142 Alloy Steel Composition Table
Elements Iron, Fe Chromium, Cr Manganese, Mn Carbon, C Silicon, Si Molybdenum, Mo Sulfur, S Phosphorous, P
Min (%) - 0.8 0.75 0.4 0.15 0.15 - -
Max (%) ≥ 96.725 1.1 1.1 0.45 0.3 0.25 ≤ 0.040 ≤ 0.035

Advantages and Disadvantages of AISI 4142 Alloy Steel


  • High Hardenability: Offers good depth of hardening suitable for high-strength applications.

  • Improved Wear Resistance: Better wear resistance compared to other alloy steels.

  • Moderate Machinability: Excellent material to machine in annealed or normalized condition.

  • Good Toughness: Retains reasonable toughness at high hardness.


  • Limited Weldability: Requires preheat treatment and stress relief after welding to prevent crack formation.

  • Lower Corrosion Resistance: Fragile under harsh conditions, especially high moisture.

  • Not Suitable for Elevated Temperatures: May experience reduced performance at high temperatures.

  • Cost: Higher cost compared to other carbon steels.

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