The residual compressive stress on the hot-dip galvanized square tube can improve its wear-resistant properties and the fatigue front of the tensile stress, while the residual tensile stress on the square tube is actually opposite to the compressive stress. Next, let me introduce to you why the prestress remains on the galvanized square pipe.
Residual stresses due to deformation caused by cold plasticity. When the galvanized square tube is processed, the machined surface of the square tube is caused by the strong cold plasticity due to the effect of the cutting force. The most prominent cause of this cold plastic deformation is that the knife above the knife faces the extrusion of the surface of the square tube and the plastic deformation produced by the friction. Because the base metal of the square tube is in an elastic state at this time.
After the cutting force is disappearing, the metal of the matrix tends to be restored. At this time the galvanized square tube has been restricted by the shape of the plastic surface, causing the matrix to be unable to restore the original shape, so that the stress on the surface will remain on the surface, and the stress remaining on the surface of the surface will lead to it. The wear resistance and the strength of anti fatigue decrease.
Thank you for your busy schedule to pay attention to the product information released by the company. If you want to know more, you can come to our company for consultation. We welcome your presence and cooperate with you!