The measures to reduce the softening of EN10025-5 S235J2W weathering steel plate mainly depend on its chemical composition, microstructure and processing method.
For hot cut parts, the smaller the part, the greater the risk of softening of the whole part. If the temperature of steel plate exceeds 200-250℃, the hardness of EN10025-5 S235J2W weathering steel plate will decrease.
The best way to eliminate the softening risk of EN10025-5 S235J2W weathering steel plate is cold cutting, such as water jet cutting. If thermal cutting is necessary, plasma or laser cutting should be selected. This is because the flame cutting to provide more heat to the workpiece, thus increasing the temperature of the workpiece.
Underwater cutting method: it is an effective method to limit and reduce the softening zone of EN10025-5 S235J2W weathering steel plate. Water is used to cool EN10025-5 S235J2W weathering steel plate and cutting surface in the cutting process. Therefore, EN10025-5 S235J2W weathering steel plate can be cut in water or sprayed with water. The underwater cutting method can choose plasma or flame cutting.
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