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Strength and Versatility of Alloy Steel


Our alloy steel round bar stock contributes much to the aerospace construction industries and works best in forging operations.

O’Hare Precision Metals is a committed alloy steel round bar supplier and precision grinding services provider that is considered a leader in supplying businesses with quality alloy steels and forgings, which are in high demand in industrial applications.

Alloy Steel

Alloy steels possess forging capabilities, encompassing flanges, discs, hubs, seamless rolled rings, blocks, cylinders, and sleeves, shafts, and stepped shafts. However, their capabilities extend beyond that. Primarily, alloy steels find application in the automotive industry and aircraft construction and components. This steel type is also capable of tempering and quenching at various rates to achieve elevated strength and toughness.

What distinguishes alloy steels? They undergo alloying by incorporating a diverse range of elements, with levels ranging from 1% to 50% by weight, to further enhance their mechanical properties.

These metals acquire crucial elements, such as nickel, magnesium, molybdenum, chromium, aluminum, and vanadium, during the tempering and quenching process, aiding in bringing out their finest qualities.

The addition of these elements serves to augment hardenability, enabling the steel to attain greater depth during the hardening process. Consequently, the toughness and strength of the entire forged component are ensured after heat treatment, setting it apart from other metals and steel types.

Alloy steels with medium to high carbon levels pose challenges in welding. However, by reducing the carbon content from 1% to 3%, alloy metals can achieve improved formability and weldability, reinforcing the material.


We extend our inventory of alloy steels available in varying sizes, grades, shapes, and forms. These engineering alloys can heat treatment for an extensive range of mechanical properties. At O’Hare Precision Metals, we produce alloy steels and centerless ground bar supplies that are forged and machined to a near-perfect dimension and tight tolerances.

As an expert alloy steels and centerless ground bar supplier, the quality of our production is constantly tested and inspected in terms of quality from the very start of the process up until it’s finished, just so that we can always meet the customer’s criteria and requests when they need it.


Alloy steel primarily dominates the action in aerospace construction and framing due to its high strength and lightweight properties.

Aircraft Alloy Steel

We stock aircraft alloy steels that possess significant functions in aircraft construction and the aerospace industries. As a result, alloy steel’s properties can be modified and enhanced to increase hardness, corrosion resistance, durability, and other factors that are crucial in the aircraft construction and aerospace industry.

This capability of alloy steel makes it highly appealing, particularly when working under extreme conditions where these properties are vital.

Alloy steels can be categorized into low-alloy and high-alloy, with high-alloy steel being commonly sought after in the aircraft construction and aerospace industry. This type of high-alloy steel is characterized by a high percentage of alloying elements.

To cater to the needs of companies in the aerospace industry, O’Hare Precision Metals offers a comprehensive range of aircraft high-alloy steel round bar stock, available in precision and centerless ground bar forms.

At O’Hare Precision Metals, we prioritize producing alloy steels with precise tolerances and exceptional quality, available in various sizes and shapes to meet the specific requirements of our customers across local and global markets.

Our aircraft quality metals undergo rigorous testing, approval, and certification to ensure their suitability for manufacturing aircraft parts. Please explore our range of products suitable for your aircraft applications and feel free to contact us for further information.

If your desired material is not included in our product options, please reach out to us via call or by contacting us to request a quote tailored to your alloy steel round bar stock specifications today!


An alloy is a mixture of two or more elements that when mixed, continue to retain their metallic properties. Not all varieties have to contain alloys, as the constituents don’t react chemically.

Alloy Steel Grades

An example of this would be adding a particular portion of chromium or nickel to iron with a dash of carbon, often resulting in stainless steel. Still, when you mix metal sodium and halogen chlorine, this does not form an alloy.

Alloy steel grades are versatile as they combine toughness, strength, fatigue strength, and wear resistance. Alloy steels are made out of many elements and metals that are alloyed together to create rigid properties required in various applications in various industries.

Alloy steel grades mostly have reasonable strength that can withstand high temperatures around 600° and above, as well as maintain excellent atmospheric corrosion resistance. These alloy grades are ideal for multiple forgings to form accurate sizes intended for a specific application. It is advisable to forge alloy steel grades that are not below 1600°.

Alloy steel grades are mainly fit for various applications like aerospace, agricultural, and defense industries, myriad uses in automotive and gas sectors, and typical services in shafts, spindles, and forged gears.

In addition, with its featured properties, alloy steel grades can undergo a lot of machining operations and conditions, such as:

  • Heat Treatment
  • Annealing
  • Normalizing
  • Hardening
  • Tempering
  • Welding

Their machinability is highly permitted with its optimum structure. Since alloy steel grades possess good weldability, they can be forged easily through any commercial method.


4120has good rigid strength propertiesused for forging applications such as forged valve bodies and pumps
4125a chromium-molybdenum alloy steel displays good strength and toughness propertiesautomotive and engineering gear, engine construction – steering knuckles, forged crankshafts, etc.
4130readily machineable, weldable, and malleable, has brutal strengthcommercial and military aircraft, machine tools, automotive, hydraulic tools, aerospace, auto racing
4135low-alloy steel, capable of being heat treated, and has reasonable toughnessforged shafts, fixtures, collars, jigs, spindles
4140provides good hardness penetration, wear-resistant, tough, and ductilehighly stressed parts or components subjected to severe wear
4142medium-carbon steel, readily heated and has brutal strengthdie holders, forged gears, collets, spindles, arbors, flanges, axles, clutch parts, etc.
4145chromium-molybdenum low alloy steel, readily generated, welded, and machineddrill collars, shafts, forged gears, rolls for paper mills, tool holders, and pump shafts
4150low-alloy steel has good atmospheric corrosion resistance and strengthforgings in the aerospace, gas, and oil industries, forged gears, posts, and spindles
4340nickel-chromium-molybdenum alloy has high toughness and fatigue strengthcommercial and military aircraft, machine tool applications, automotive systems, forged steel crankshafts
52100high carbon, chromium alloy steelfor highly stressed parts like aircraft bearing
6150fine-grained carbon-chromium alloy steel, highly abrasion resistantgear and engine construction, forged crankshafts, connecting rods, pump and gear shafts, spindles, and steering knuckles
8620most widely used carburizing alloy has high core strengthforged camshafts, gears, and fasteners
8740nickel-chromium low alloy steel has rigid strength propertieshigh-strength forged fasteners
9310low alloy steel has good hardenability and fatigue strengthcrankshafts, heavy-duty gear shafts, gears in truck and aircraft construction

O’hare Precision Metals is a centerless ground bar and precision grinding services provider that prides itself on the quality of alloy steel round stock that we, as one of the top alloy steel round bar ssuppliers, can provide you and other clients.

If you would like to know more about the kinds of services and products that we can offer you, then contact us now and send a quote for your required product.

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Contact Info

O’hare Precision Metals specializes in centerless grinding services and provide precision ground bar materials, focusing high tolerance and offering essential machining services.
O’hare Precision Metals, LLC
2404 W. Hamilton Rd. Arlington Heights, IL 60005
Tel.No. (847) 640-6050
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