Alloy Steels. Alloy steels contain alloying elements (e.g. manganese, silicon, nickel, titanium, copper, chromium, and aluminum) in varying proportions in order to manipulate the steel's properties, such as its hardenability, corrosion resistance, strength, formability, weldability or ductility.‎Stainless Steel · ‎4 Types of Steel and Their Uses · ‎Steel's Properties, History, and. Table of steel composition and related specifications. Additionally, SAE ASTM and AISI common carbon and alloy steel refereces and typical applications data is. Alloy steel is made by combining carbon steel with one or several alloying elements, such as manganese, nickel, titanium, copper, chromium.


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Aluminium dissolves in the ferrite alloy steel composition forms the compounds Al2O3 and AlN. The type of carbide that chromium forms depends on the amount of carbon and other types of alloying elements present.

Tungsten and molybdenum form carbides if there is enough carbon and an absence of stronger carbide forming elements i. Vanadium, titanium, and niobium are strong carbide forming elements, forming vanadium carbidetitanium carbideand niobium carbide alloy steel composition, respectively.

Manganese and nickel lower the eutectoid temperature and are known as austenite stabilizing elements.


With enough of these elements the austenitic structure may be obtained at room temperature. Carbide-forming elements raise the eutectoid temperature; these elements are known as ferrite stabilizing elements.

However, variations in carbon have the alloy steel composition effect on mechanical properties, with increasing carbon content leading to increased hardness and strength.

As such, carbon steels are generally categorized according to their carbon content. As a group, carbon steels are by far alloy steel composition most frequently used steels.

Low-carbon steels contain up to 0.

Classification of Carbon and Low-Alloy Steels

The largest category of alloy steel composition class of steel is flat-rolled products sheet or stripusually in the cold-rolled and annealed condition. The carbon content for these high-formability steels is very low, less than 0.

Typical uses are in automobile body panels, tin plate, and wire products. For rolled steel structural plates and sections, the carbon content may be increased to approximately 0.

These materials may be used for stampings, forgings, seamless tubes, and boiler plate. Medium-carbon steels are similar to low-carbon steels except that alloy steel composition carbon ranges from 0.

Classification of Carbon and Low-Alloy Steels

Increasing the carbon content to approximately 0. The uses of medium carbon-manganese steels include shafts, axles, gears, crankshafts, couplings and forgings.

Steels in the 0. High-carbon steels contain from 0.

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High-carbon steels are alloy steel composition for spring materials and high-strength wires. Ultrahigh-carbon steels are experimental alloys containing 1. These steels are thermomechanically processed to produce microstructures that consist of ultrafine, equiaxed grains of spherical, discontinuous proeutectoid carbide particles.

The HSLA steels have low carbon contents 0. Small quantities of chromium, nickel, molybdenum, copper, nitrogen, vanadium, niobium, titanium and zirconium are used in alloy steel composition combinations.


The various types of HSLA steels may alloy steel composition have small additions of calcium, rare earth elements, or zirconium for sulfide inclusion shape control.

Low-alloy Steels Low-alloy steels constitute a category of ferrous materials that exhibit mechanical properties superior to plain carbon steels as the result of additions of alloying elements such as nickel, chromium, alloy steel composition molybdenum.

Total alloy content can range from 2. For many low-alloy steels, the primary function of the alloying elements is to increase hardenability in order to optimize mechanical properties and toughness after heat treatment.


In some cases, however, alloy additions are used to reduce environmental degradation under certain alloy steel composition service conditions.

As with steels in general, low-alloy steels can be classified according to: Chemical composition, such as nickel steels, nickel-chromium steels, molybdenum steels, chromium-molybdenum steels Heat treatment, such as quenched and tempered, normalized and tempered, annealed.

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