Difficulties in processing hot bending of NM400 wear-resistant plate

1. Difficulties caused by material properties
High strength and high hardness: The hardness of NM400 wear-resistant plate reaches 400HBW level, and the yield point and tensile strength are high. For example, produced by Dillingen Steel in Germany, its tensile strength reaches 1200MPa and the yield point is 800MPa, which makes it easy to use during hot bending. During the process, greater bending force is required to deform it, which requires higher power and performance requirements for the hot bending equipment. At the same time, the material still has high strength at high temperatures and cannot be easily bent into the required shape, which increases the difficulty and complexity of the hot bending operation.
Easy to produce springback: Due to the high yield point of NM400 wear-resistant plate, even if the bending deformation occurs in the heated state during the hot bending process, when the external force is removed, due to its high strength and high hardness characteristics, there will be a larger The amount of elastic recovery makes it difficult to accurately control the shape and size after bending. It requires multiple attempts and precise adjustment of process parameters to achieve the ideal bending effect.

2. Difficulties related to hot bending process
Temperature control: During the heat bending process, it is difficult to accurately control the heating temperature. NM400 wear-resistant plates with different thicknesses and sizes may require different heating temperature ranges. If the temperature is too high, it may cause changes in the structural properties of the steel plate, affecting its wear resistance and other properties; if the temperature is too low, it will not be able to achieve good results. Due to the hot bending effect, the material has insufficient plasticity and is prone to defects such as cracks.
Hot bending speed control: If the hot bending speed is too fast, the stress inside the plate may not be released in time, and stress concentration may occur at the bending part, which may lead to cracks. If the hot bending speed is too slow, the production efficiency will be reduced, and the plate will be exposed to high temperatures. Staying down for too long may also affect its performance.

3. Difficulties in quality assurance after processing
Surface quality: During the hot bending process, due to the large bending force and high temperature, it is easy to cause scratches, oxide scale and other defects on the surface of the NM400 wear-resistant plate, which affects the appearance and surface quality of the plate and may require subsequent polishing and cleaning. Wait for the process to repair the surface.
Dimensional accuracy: factors such as the springback problem mentioned earlier and uneven deformation during the hot bending process make it difficult to ensure the dimensional accuracy of NM400 wear-resistant plates after hot bending, such as precise control of bending angle, bending radius and other dimensions. It is a challenge. For some application scenarios that require higher dimensional accuracy, more precise process control and measurement methods are needed.

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