Advantages and disadvantages of hot rolling process of wear-resistant plate
Wear-resistant plate manufacturing process there are two kinds of hot rolling and cold rolling, any kind of wear-resistant plate can be manufactured using these two methods, then since they can be manufactured why there are two methods, it is because they each have shortcomings, each has advantages, we can according to their specific needs, pay more attention to which aspect of the performance of the selection of manufacturing methods. Because the wear-resistant plate hot rolling process is more common, the following take you to understand the advantages and disadvantages of the wear-resistant plate hot rolling process.
Advantages of wear-resistant plate hot rolling: It can damage the ingot casting structure, eliminate some fine defects on the structure, refine the steel grain, make the steel structure more tightly organized, and improve the overall performance. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent; Some defects such as bubbles, cracks and looseness formed during pouring can be eliminated under high temperature or high pressure.
Many things follow the principle of thermal expansion and cold contraction, so is the wear-resistant plate, when the weld is treated, the local contract-induced strain can reach several times the yield point, and the stress is much larger than the load caused. In addition, under huge pressure, the non-metallic inclusions, some sulfides or oxides inside the wear-resistant plate are pressed into sheets, and the phenomenon of stratification appears. Delamination greatly worsens the tensile properties of steel along the thickness direction, and may cause interlayer tearing when the weld is contracted.
Another situation is that if the wear plate hot rolling process is used, if the cooling is not uniform, it will cause residual stress. Residual stress is the internal self-equilibrium stress in the absence of external force, many hot-rolled wear-resistant plates will encounter this situation, the larger the steel section size, the greater the residual stress. Under normal circumstances, the residual stress can maintain its balance with each other, but the wear-resistant plate needs to be handled under the action of external forces in many cases, and the balance will be destroyed at this time. Such as deformation, stability, anti-fatigue and other aspects of the operation will cause a bad situation.
