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Alloy Steel

what is Alloy Steel


Alloy steel is a type of steel that has been alloyed with other elements to enhance its properties such as strength, hardness, durability, and resistance to corrosion. The alloying elements can include manganese, nickel, chromium, vanadium, molybdenum, silicon, and tungsten, among others.

Alloy steel is commonly used in a wide range of applications, including construction, manufacturing, transportation, and the production of tools and machinery. Its specific properties and composition depend on the intended use and the desired outcome. For example, adding chromium and molybdenum to steel can increase its resistance to corrosion, while adding nickel and tungsten can enhance its strength and toughness.

Overall, alloy steel is highly versatile and widely used due to its ability to offer improved mechanical properties over traditional carbon steel.


The specification for alloy steel depends on the specific type and application of the steel. Below are some common specifications for different types of alloy steel:


Alloy Steel TypeCommon ApplicationsTypical Specification
AISI 4140Automotive and machine parts, oil and gas industryC: 0.38-0.43%, Mn: 0.75-1.00%, Si: 0.15-0.35%, max P&S: 0.025%
AISI 4340Aerospace, oil and gas, power generationC: 0.38-0.43%, Mn: 0.60-0.80%, Si: 0.15-0.35%, max P&S: 0.025%
AISI 8620Gears, shafts, machine partsC: 0.18-0.23%, Mn: 0.70-0.90%, Si: 0.15-0.35%, max P&S: 0.040%
ASTM A387Pressure vessel applicationsVarious grades with different combinations of alloying elements, ranging from grade 11 to grade 91



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