When the steel yield to a certain extent, due to the rearrangement of internal grains, its resistance to deformation is improved again. At this time, although the deformation develops rapidly, it can only increase with the increase of stress until the stress reaches the maximum value. After that, the ability of the steel to resist deformation is significantly reduced, and a large plastic deformation occurs at the weakest part, where the cross-section of the specimen is rapidly reduced, necking phenomenon occurs, until fracture failure. The maximum stress value of steel before tensile fracture is called strength limit or tensile strength.
SS400 is a marking method of Japanese steel, which is actually domestic Q235 steel. It is a kind of steel material. Q represents the yield of this material. The latter 235 refers to the yield value of this material, which is about 235. And the yield value will decrease with the increase of the thickness of the material. Due to its moderate carbon content, good comprehensive properties, good combination of strength, plasticity, welding and other properties, it is the most widely used. It is often rolled into wire rod or round steel, square steel, flat steel, angle steel, I-beam, channel steel, window frame steel and other section steel, medium and thick steel plate. It is widely used in architecture and engineering structures. It is used for making steel bars or building plant frames, high-voltage transmission towers, bridges, vehicles, boilers, containers, ships, etc. it is also widely used as mechanical parts with low performance requirements. C. Grade D steel can also be used as some professional steel.
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