Grade Guide: S275 Steel
Chemical Composition
S275 is a low carbon steel. Low carbon steels are classified by having less than 0.3% carbon by weight. With a maximum carbon of 0.25%, S275 steel is easily machined, welded, and formed, making it extremely useful as a general-purpose steel. The low carbon also prevents heat treatment from having much of an effect on S275 steel. S275 steel usually has small amounts of other alloying elements as well, including manganese, sulfur, phosphorus, and silicon. These alloying elements are added to give the steel its desired chemical and mechanical properties. Since S275 does not contain large amounts of nickel or chromium, it lacks corrosion resistance.
Designation
Unlike most steel grades, S275 is not designated by its chemical composition. Instead, S275 is designated by its mechanical properties. This means that, while most grades must have added alloys that fit between certain percentages, S275 must meet specific mechanical standards. For example, steel bars and plates must have a minimum yield strength of 36,000 ksi or 275N/mm2 – hence the name S275. The tensile strength must be the range of 370 – 530 MPa.
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