SS400/SS490/SS540 U steel bar
SS400: It is a common carbon structural steel, also called A3 steel, which is equivalent to Q235 steel in China. "400" represents the lower limit tensile strength of 400Mpa, with moderate carbon content, and has good comprehensive properties such as strength, plasticity and weldability. As the thickness increases, its yield value decreases by 23. SS490: Although the relevant search results do not introduce its material properties in detail, it is speculated from the naming rules that "490" may represent that its lower limit tensile strength is 490Mpa, which should belong to the same structural steel category as SS400, and may be better than SS400 in strength and other properties. SS540: Similarly, "540" may mean that the lower limit tensile strength is 540Mpa. Compared with SS400 and SS490, its strength performance may be more outstanding.
