4140 Cold Rolled Steel

In steel manufacturing, rolling is a forming process whereby metal materials are passed through a pair of rollers. There are different types of rolling; the most common are hot rolling and cold rolling. Rolling is classified according to the temperature of the metal rolled. Cold rolling is the process that occurs when the metal is below its recrystallization temperature. When the metal is higher than its recrystallization temperature it is referred to as hot rolling.

The term steel refers to iron whereby 0.02 to 1.7% carbon has been added. There are many different types of steel and various alloys and applications for each type. Generally steel is low cost and it is easy to finish with paint or other coatings. This makes steel a popular choice for many different types of products. It is used commonly in the manufacturing of automobiles, homes, cutlery, appliances and magnetic cores just to name a few. Steel does however, have poor corrosion resistance.

The numeric system that describes types of steel helps to determine the alloying ingredients by the first two digits of the alloy number, and the last two digits refer to the carbon content. Generally, as carbon is added, machinability and weldability decreases but strength increases.

4140 Cold Rolled Steel an oil-hardened steel that has fairly high hardenability. They have a chromium content that allows good hardness and the molybdenum provides uniformity of hardness and high strength. 4140 responds well to heat, resisting up to 1000 degrees Fahrenheit and are quite easy to machine in the heat treated state. It responds particularly well to forging as it has self-scaling characteristics.

Cold Rolled 4140 Steel is well regarded for its wear resistance, toughness, strength and ability to resist stress at high temperatures. For this reason, it is one of the most extensively used alloys. 4140 is also available as a leaded steel which improves the machinability without forfeiting other important properties.

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