Chemical Composition of Mild Steel A36 Plates

Mild Steel A36 Plates

One of the most popular metals for structural purposes is steel. It is ductile, formable, tough, strong, and weldable. It is crucial to understand some of the primary characteristics of A36 steel because there are numerous varieties of steel available, each having distinct chemical and mechanical qualities.

Chemical Structure

Low carbon steel is A36. Steels that contain less than 0.3 percent carbon by weight are referred to as low carbon steels. This makes A36 steel a very valuable general-purpose steel because it makes it simple to process, weld, and mould. Additionally, due to the low carbon content, heat treatment has little to no impact on A36 steel. Manganese, sulphur, phosphorus, silicon, and other alloying elements are frequently present in A36 steel in minor concentrations. To give A36 steel the desired chemical and mechanical qualities, alloying materials are added. A36 does not have great corrosion resistance since it does not include significant concentrations of nickel or chromium.


American Society for Testing and Materials (ASTM) A36 steel is not classified by chemical composition, unlike the majority of AISI grades like 1018, 1141, or 4140. Instead, mechanical characteristics are used to identify A36. This indicates that while A36 must adhere to particular technical requirements, most grades must have additional alloys that fall within a range of percentages. For instance, the minimum yield strength for steel bars and plates is 36,000 pounds per square inch. While A36 steel must adhere to several chemical composition standards, the yield strength requirement is the most crucial one.

Additional Mechanical Features

Ultimate tensile strengths for A36 steel can range from 58,000 to 79,800 psi. The precise ultimate tensile strength depends on a number of variables, including chemical makeup and forming technique. When subjected to tensile testing, A36 is comparatively ductile and can stretch to around 20% of its initial length. At room temperature, it has good impact strength thanks to its strength and ductility.

Making of the A36

The production of Mild Steel A36 Plates is comparable to that of other carbon steels. In the beginning, coal and iron ore are mixed in a furnace. As alloying elements are added to the molten steel, impurities are burnt away. When the A36 steel has reached the desired chemical composition, it is solidified into a rectangular ingot. Typically, A36 steel is hot rolled. This indicates that it is rolled to its precise proportions while the ingot is heated to a high temperature.

The Usage of A36

Because it is relatively inexpensive, A36 steel is utilized in a wide range of industries for a variety of applications. The mechanical characteristics, as already indicated, make it especially suitable for structural applications. A36 steel is used in the construction of many bridges. A36 steel is widely used to construct buildings due to its great strength and hardness. Components for the automotive, building, heavy equipment, and oil and gas industries are also made with A36 steel.


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