... manufacture as carbon steels, high-strength low-alloy steels (HSLA), heat-treatedcarbon steels, and heat-treated constructional alloy steels. A typical stress-strain curve for a steel in each classification ... information for each of the steels is available from most steel producers and inpublications of the American Welding Society.1.1.1 Carbon SteelsA steel may be classified as a carbon steel if (1) the maximum ... HSLA steels.Because these steels offer increased strength at moderate increases in price over carbon steels,they are economical for a variety of applications.A242 steel is a weathering steel, ...