What is the difference between A36 and A588?

A36 and A588 are two different grades of steel that are commonly used in various applications. Here are the key differences between A36 and A588:

Chemical Composition: A36 is a carbon steel that typically contains a maximum of 0.29% carbon, while A588 is a low-alloy steel that contains additional alloying elements such as copper, chromium, and nickel. The exact chemical composition may vary depending on the specific product specifications.

Strength and Mechanical Properties: A36 has a minimum yield strength of 36,000 psi (250 MPa) and a minimum tensile strength of 58,000-80,000 psi (400-550 MPa). A588, on the other hand, has a minimum yield strength of 50,000 psi (345 MPa) and a minimum tensile strength of 70,000-90,000 psi (485-620 MPa). A588 generally offers higher strength compared to A36.

Corrosion Resistance: A36 is not designed to be corrosion resistant and will typically undergo surface corrosion when exposed to atmospheric conditions. A588, however, is a weathering steel that exhibits enhanced corrosion resistance. It forms a protective layer of rust or patina on its surface when exposed to the elements, which helps mitigate further corrosion.

Applications: A36 is widely used in general structural applications such as buildings, bridges, and machinery. It is suitable for a wide range of applications where moderate strength and good weldability are required. A588, due to its improved corrosion resistance, is often used in outdoor structures, such as bridges, construction equipment, and architectural components.

These differences are general characteristics, and the specific properties and requirements can vary based on the manufacturer and product specifications. It is recommended to consult the relevant standards and guidelines or contact the manufacturer for detailed information on each specific grade and its suitability for a particular application.