This low-carbon steel is a common choice for a variety of applications due to its combination of machinability, weldability, and moderate strength. It is generally supplied in the “as rolled” condition, meaning it’s not heat-treated, and exhibits a typical yield strength around 30,000 psi and tensile strength of approximately 55,000 psi. Its chemical composition, primarily iron with a small percentage of carbon (around 0.18-0.23%), along with traces of manganese, phosphorus, sulfur, and silicon, contribute to its characteristic properties.
The affordability and ease of fabrication make this material suitable for components that don’t require high strength or hardness. Its wide availability further contributes to its popularity. Historically, plain-carbon steels like this one have played a crucial role in industrial development, forming the backbone of numerous structural and mechanical applications. While higher strength alloys have emerged over time, this material remains a reliable and cost-effective option for many engineering challenges.
