ss400 is a kind of marking method of Japanese steel material and a kind of judging standard. 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.Due to moderate carbon content, good comprehensive performance, strength, plasticity and welding properties have been better matched, the most widely used.

SS330 is a kind of high strength, corrosion resistance and wear resistance steel, because of its excellent properties, it is widely used in machinery manufacturing, construction engineering and shipbuilding. The tensile strength of SS330 is as high as 400-540 mpa, which is a high-strength steel with good mechanical properties. At the same time, SS330 has good plasticity and toughness, which can meet different material processing and process requirements.

SS490 is a hot-rolled pickling steel strip widely used in general structural applications. It is known for its exceptional strength, durability and versatility and is suitable for a variety of construction projects. SS490 is produced by a hot rolling process and then pickled to remove surface impurities and oxide layers, resulting in a clean and smooth surface finish. This steel strip has good weldability, machinability and formability, and is easy to manufacture and assemble.