How to prevent the self tapping screw from hardening and bending?

For those who often use self tapping screws, it is obvious that self tapping screws must undergo heat treatment, which is what we usually call hardening. Since self tapping screws or screws are used for drilling and tapping to achieve tight connection, it requires that self tapping screws themselves have strong hardness, so that they can play a role< br> The wire hardness of the self tapping screw just produced is not enough to meet the requirements of customers. At this time, we need to heat treat the screw, that is, harden the screw. At that time, we often did not pay attention< br> In the process of hardening, some tapping screws will bend, especially long screws. So, in this case, what should we pay attention to? How can we better prepare for this and reduce the damage of screws< br> Heat treatment leads to the bending of tapping screws, which is often caused by the stacking problem of heating tapping screws. The long screw has a large area, and some screws are not uniform due to stacking, resulting in bending. Of course, in addition to this reason, there are many other factors that determine this< br> For example, too fast furnace temperature rise and too high quenching temperature are variable bending factors. When the furnace temperature is too high, the critical point of the material is too large, and deformation is easy to occur< br> Therefore, whether it is a hard factory or a consumer, we should understand the above points during the heat treatment and hardening of self tapping screws to prevent defective products or damaged screws< br>