熱門關鍵詞：濟南彩鋼板 | 濟南復合板 | 濟南彩鋼瓦 | 濟南c型鋼 | 濟南鋼結構 |
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?
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.
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 are residual stresses in hot-rolled C-section steel, but this is due to the residual stresses caused by uneven cooling. Under the action of external forces, there will be problems in deformation, stability and other properties, which are dangerous to some extent.
Hot rolling can destroy the casting structure of ingot and refine the defects of grain microstructure of steel, so as to change the compact structure and mechanical properties of steel. This change 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.
The main difference is
1. Cold rolled steel allows local buckling of the section, which can make full use of the bearing capacity of the member after buckling, while hot-rolled steel does not allow local buckling of the section.
2. The causes of residual stress in hot rolled section steel and cold rolled section steel are different, so the distribution on the section is also very different.
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