What is low alloy high strength structural steel?

Low-alloy high-strength structural steel refers to steels that add some alloying elements during the steelmaking process, and the total amount does not exceed 5%. After adding alloying elements, the strength of steel can be significantly improved, so that the three main control indicators of strength, stiffness, and stability of steel structural components can be fully exerted, especially in large-span or heavy-load structures, the advantages are more prominent, generally comparable to carbon Steel saves about 20% of steel consumption.

Chinese standard of low-alloy high-strength structural steel is GBT 1591-2018 standard. Its brand representation method is the same as that of carbon structural steel. The yield point value and quality grade symbols (A, B, C, D, E) are arranged in sequence. There are five types of grades: Q295, Q345, Q390, Q420, and Q460.

Common grades: Q345A,Q345B, Q345C, Q345D, Q390B, Q390C, Q390D, Q390E, Q460C, Q460D, Q460E