For those who use China Nut, it is clear that self-tapping screws must be heat treated, which is what we often call hardening. Because self-tapping screws or screws are used for tapping and tapping to achieve a tightening connection, the screws themselves should have strong hardness to make them work.
For the newly produced screws, the hardness of the screw wire itself is not enough to meet the customer's requirements. At this time, we need to go through the heat treatment of the screw, that is, hardening the screw. At that time, when we were not paying attention, some screws would bend during the hardening process, especially the occurrence of long screws. So in this case, what should we pay attention to when strengthening? How can we better prevent this from happening and reduce the damage to the screws?
Heat treatment causes the screw to bend, which is often a problem with the stacking of heating screws. The area of long screws is large, and part of the area of the screws is not evenly heated due to stacking, which results in bending. Of course, in addition to this reason, there are some factors that determine it. For example, the furnace temperature rises too fast, the temperature is too high during quenching, etc., which are all factors of bending. The temperature in the heating furnace exceeds the critical point of the material too much, and it is prone to deformation.
Therefore, both Bolt Factory and consumers should understand that when self-tapping screws are heat treated and hardened, the above points should be paid attention to to prevent defective products or damage the screws.