Most NM400 steel plates are subject to both cold cutting and hot cracking during the cutting process, and the same applies to wear-resistant steel plates. Cold cutting refers to waterjet cutting, sawing, or abrasive cutting. Hot opening includes flame cutting, back-particle cutting, and laser cutting. An important issue when cutting NM400 wear-resistant steel plates is...

When cutting Nm400 wear-resistant thick plates, the tendency for cutting edges to increase with the thickness and hardness of the steel plate. To prevent cracks in the steel plate, whether through hot cutting or cold shearing, it is important to pay attention to relevant requirements and further improve cutting quality.

When Nm400 wear-resistant steel develops cracks, they typically appear within 48 hours to several weeks after cutting. Therefore, the切口 cracks are classified as烟性裂纹 (smoke cracks). The thicker and harder the steel plate, the larger the切口 cracks. A more effective way to prevent cracking of the steel plate is to preheat it before cutting.

The preheating temperature for Nm400 wear-resistant steel plates primarily depends on the quality grade of the steel plate and its thickness. The preheating methods can include flame combustion, electronic heating pads, or oven heating. To confirm the preheating effect of the steel plate, it is necessary to test the required temperature on the surface of the blanket added to the hot spot. Please note that the entire interface of the wear-resistant steel plate should be heated uniformly to avoid partial overheating in the areas in contact with the heat source.