Ss400 is a Japanese steel grade, which is equivalent to Q235 in China, but there is still a gap. Compared with Q235, there is no such material on the market. It depends on the requirements of your customers. If it can be replaced by the national standard, it will look good, cheap and worry-free. If you must use the Japanese standard, I can book futures for you. If you have a large number, there may be some boards on the market. It's all fate, hehe.