AISI 4027 Molybdenum Alloy Steel Chemical Composition & Properties, Grade, Table and Pdf

AISI 4027 is a type of the low alloy molybdenum steel, which is known for its outstanding mechanical properties, including good strength, toughness, and wear resistance. In general, the elements found in the structure of this metal are carbon, manganese, phosphorus, sulfur, silicon, chromium, and molybdenum. Grade 4027 is known as a good option for through hardenability and is moreover heat treatable to reach the required mechanical properties. This makes it possible to use it for various applications like gears, shafts, axles, etc. which are usually needed to have high mechanical properties and therefore not vulnerable to wear and tear. Its properties are usually depicted by high elasticity or shear strength, as well as good resistance to stress at low loads. The chemical formula of AISI 4027 can be found in a specialized table, chart and Pdf dedicated to the same steel. This will help the engineers and manufacturers to find the chemical formula and properties of this steel.

AISI 4027 Alloy Steel Chemical Composition And Grade Table

AISI 4027, which is the low alloy strain often used for its impressive strength and toughness characteristics, is a famous steel. It has a standard atomic structure, which comprises the elements like carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum etc., and in some cases includes vanadium too. By extension of that, the composition of this steel alloy provides good ductility and abrasion resistance, the reason why it can be used in many applications that demand maximum strength and robustness. Thermomechanical heat treatment shows AISI 4027 a way to gain the necessary mechanical properties in order for the alloy to be used in sectors such as automotive, heavy machinery, and construction. Below is a typical grade table showcasing its composition and properties.

AISI 4027 Alloy Steel Composition Table
Elements Iron (Fe) Manganese (Mn) Carbon (C) Silicon (Si) Molybdenum (Mo) Sulfur (S) Phosphorus (P)
Min (%) 98.1 0.7 0.25 0.15 0.2 - -
Max (%) 98.7 0.9 0.3 0.35 0.3 0.04 0.035

Advantages and Disadvantages of AISI 4027 Molybdenum Alloy Steel


  • Good Wear Resistance: Provision of endurance in abrasion-intensive context.

  • High Strength: Can offer good tensile strength for other requirements for any application.

  • Toughness: Resists the applied loads and has capability to bear the impacts or loads that is applied on the structure.

  • Machinability: Machinability rating is high, better than majority of other high-alloy steels.


  • Corrosion Resistance: It forms moderate resistance and not for highly corrosive environment.

  • Weldability: Need prior and post-weld heat treatment to prevent crack formation.

  • Cost: Usually cost higher compared to plain carbon steels.

  • Availability: It may not be as easily procured as other forms of steel brands, which are usually more popular.

Related Topics

Here is another related topic that you may also like.