Analysis of Cutting Delayed Cracks in Wear-resistant Steel Plate NM400

Wear-resistant steel plate NM400 is a high-strength steel plate with excellent wear and corrosion resistance properties. With its high hardness and strength, it can provide superior protection for mechanical components and structures against wear, corrosion, and other types of damage. This steel is commonly used for construction and aerospace components, in industrial and automotive applications, for heavy-duty equipment and for stockpiling.
    
Cutting delayed cracks in wear-resistant steel plate NM400 can significantly reduce the welding and cutting time.Due to its excellent wear and corrosion resistance, prolonged exposure to high temperatures, or even intermittent contact with aggressive chemicals, NM400 can suffer from delayed cracking during cutting. Delayed cracking occurs when hard and brittle pieces of the material are detached or break down as a result of processing or welding operations. This occurrence is particularly harmful as, depending on the cutting temperature, it can weaken the entire surface of the steel plate.
    
Welders and fabricators must take preventive measures to avoid cutting delayed cracks in wear-resistant steel plate NM400:
    
First of all, when welding or cutting the plate, preheat the plate to at least a temperature of 100°C. Preheat the steel plate slowly˜from room temperature up to its required temperature. This is essential for avoiding cutting delayed cracks and for increasing the weldability of the steel.
    
Second, after preheating has been completed, maintain the steel plate at a uniform temperature throughout the entire welding or cutting process. If the temperature of the steel is uneven, the process will lead to strain concentrations that can cause cracking along the weld seam or along the edge of the material.
    
Third, to ensure a uniform temperature, use a cooling system during the operation. Cooling systems are designed to keep the temperature at a constant level and to eliminate heat stresses in the material. For welding operations, cooling systems may include water cooling and air cooling.
    
Finally, reduce grinding or welding near the edges of the steel plate. By doing this, the risk of cutting delayed cracks can be considerably reduced.
    
When cutting delayed cracks occur in wear-resistant steel plate NM400, they should be properly addressed. These cracks can be welded together with a backing layer of steel. Special care should be taken to ensure that the weld is properly made, as any weaknesses can lead to further cracking or even complete destruction of a welded part.
    
By following the above-mentioned preventive measures and considering the necessary repair solutions, fabricators and welders can ensure that their wear-resistant steel plate NM400 is safely cut with minimal risk of unpleasant surprises like delayed cracks.

---