The price of drywall screws on the market now varies greatly. Cheap drywall screws only cost more than 5,000 a ton, and the more expensive ones are nearly twice as expensive. So what is the reason for such a big price difference? The production of drywall screws is a professional technical job. Today we will take a look at the production process of drywall screws.
The production process of drywall screws generally includes heat treatment, quenching, annealing, tempering, and other steps.
Drywall screw heat treatment: It is a method to change the properties of the steel by heating the steel to different temperatures and then using different cooling methods. Nowadays, the commonly used heat treatments are quenching, annealing, and tempering. What kind of effects will each of these three methods produce?
Drywall screw quenching: The heat treatment method in which the steel is heated to above 942 degrees Celsius to make the steel crystals to an austenitic state, and then immersed in cold water or cooling oil to quench the steel crystals to the martensitic state. This method can increase the strength and hardness of steel. There is a very big difference between the strength and hardness of the steel with the same label after quenching and without quenching.
Drywall screw annealing: a heat treatment method in which the steel is also heated to austenitic state and then naturally cooled in the air. This method can reduce the strength and hardness of the steel, improve its flexibility, and facilitate processing. Generally, steel will go through this step before processing.
Tempering: Whether it is quenched, annealed, or formed by pressure processing, the steel will produce internal stress. The imbalance of internal stress will affect the structure and mechanical properties of the steel from the inside, so a tempering process is required. The material is continuously insulated at a temperature of more than 700 degrees, changing its internal stress and then naturally cooled.