Is SS400 the same as Q235?

The SS400 and Q235 are similar to some extent, but not identical. SS400 is a way of marking Japanese steel, equivalent to the domestic Q235 steel. ss400 is a way of marking Japanese steel materials and is a judgment standard, equivalent to the domestic Q235 steel (also known as A3 steel). Foreign standard structural steel is often classified by tensile strength, such as SS400 (Japan is so marked), of which 400 means that the minimum value of σb is 400MPa Ultra-high strength steel refers to σb≥1373 Mpa steel.

Both SS400 and Q235 are steels used in construction and structures and have similar mechanical properties. SS400 is basically equivalent to China's Q235 steel (also known as A3 steel). The two are similar in the tensile strength of ‌, SS400 has a minimum tensile strength of 400MPa, while Q235 has a similar tensile strength requirement.

Although the two are similar in general, there are some differences in specific indicators. For example, Q235 has specific requirements for the content of carbon, silicon, manganese, sulfur, phosphorus and other elements, while SS400 only requires the content of sulfur and phosphorus to be less than 0.050%. In addition, SS400 has a yield point of 245MPa, which is slightly higher than that of Q235 (greater than 235MPa).