Jinan C-section steel is no stranger to everyone. To put it simply, it is a cold-formed section steel that looks like the "C" in the English letter, but it is divided into cold-rolled and hot C-section steel. These are also two ways of forming. In addition, the forming methods of C-section steel can also be divided into: galvanizing, hot galvanizing, punching and so on. What are the differences and similarities between these molding methods?

热轧和冷轧都是型钢或钢板成型的工序它们对钢材的组织和性能有很大的影响钢的轧制主要以热轧为主冷轧只用于生产小号型钢和薄板。

Hot rolling and cold rolling are the forming processes of section steel or steel plate, which have a great impact on the microstructure and properties of steel. The rolling of steel is mainly hot rolling, and cold rolling is only used to produce small section steel and thin plate.

冷轧C型钢就是指在常温下经过冷弯、冷拉等等一系列的冷加工把带钢加工成的。经过这种方式成型的钢虽然没有经过热态塑性压缩，但是它的截面内仍然存在着或多或少的残余应力，这对C型钢的弯曲特性会造成一定的影响。然而热轧C型钢是经热轧成型的内部会出项分层现象，这大大地削弱了受拉的能力，更为严重的是可能会出现层间撕裂的后果，这是非常危险的。并且热轧C型钢也存在着残余应力，不过这是由于不均匀冷却造成的残余应力，在外力的作用下，变形、稳定性以及抗疲劳等性能都会出现问题，这些在某种程度上来说，都是比较危险的。

Cold rolled C-section steel refers to the processing of strip steel through a series of cold processing such as cold bending, cold drawing and so on at room temperature. Although the steel formed in this way has not undergone hot plastic compression, there are still more or less residual stresses in its section, which will have a certain impact on the bending characteristics of C-section steel. However, the hot-rolled C-beam is formed by hot rolling, and there will be a delamination phenomenon inside, which greatly weakens the tensile capacity, and more seriously, it may have the consequence of interlayer tearing, which is very dangerous. Moreover, there is residual stress in hot-rolled C-section steel, but this is the residual stress caused by uneven cooling. Under the action of external force, there will be problems in deformation, stability and fatigue resistance, which are dangerous to some extent.

热轧可以破坏钢锭的铸造组织细化钢材的晶粒并显微组织的缺陷从而使钢材组织密实力学性能有所改善。这种改善主要体现在沿轧制方向上从而使钢材在一定程度上不再是各向同性体，浇注时形成的气泡、裂纹和疏松也可在高温和压力作用下被焊合。而冷轧则成型速度快、产量高且不损伤涂层可以做成多种多样的截面形式以适应使用条件的需要，冷轧可以使钢材产生很大的塑性变形从而提高了钢材的屈服点。

Hot rolling can destroy the casting structure of ingot, refine the grain of steel and eliminate the defects of microstructure, so as to improve the microstructure and mechanical properties of steel. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent, and the bubbles, cracks and porosity formed during pouring can also be welded under the action of high temperature and pressure. Cold rolling has the advantages of fast forming speed, high output and no damage to the coating. It can be made into a variety of cross-section forms to meet the needs of service conditions. Cold rolling can produce great plastic deformation of steel and improve the yield point of steel.

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