In the CSA system for steel specifications, which element indicates the yield strength and type of steel?

• A. Structural steel plate and shapes
• B. A number code denoting yield strength in MPa followed by a letter indicating type of steel
• C. The last two digits indicating carbon range
• D. The year of issue

Answer: (B)

In the CSA system, the designation for steel grades directly communicates both how strong the material is and what kind of steel it is. The yield strength is shown as a number in megapascals, telling you how much stress the steel can withstand before it yields. Immediately after that number comes a letter that specifies the steel type, such as weathering steel or another category. This combination—a yield strength value in MPa followed by a letter indicating the steel type—is the clear, standardized way CSA encodes both performance and material family in one label. For example, a designation like 350W means a yield strength of 350 MPa and the weathering steel type. Other options describe different aspects (like product form, carbon range, or issue year) and do not summarize strength and type in a single, comparable code.