What is the choice of carburizing process for locking self-tapping screws?


As we all know, there are many main factors that affect […]

As we all know, there are many main factors that affect the carburizing process of locking self-tapping screws, such as temperature and time. When the screw material, carburizing temperature and carbon potential are determined, the carburizing time will be determined according to the depth of the carburized layer. The shallow carburizing time is about 1~1.5h. The active atoms produced by various carburizing agents or carburizing gases at high temperatures are different. The carburizing potential in the continuous mesh belt furnace is set at 1.0%~1.2%; while the alloying elements in the steel absorb the steel The capacity of carbon and the diffusion of carbon into the interior have a great influence. Mn, B, Ti carbide forming elements can increase the carbon content of the surface of the cemented layer. Under the conditions of high toughness and proper hardenability, the locking self-tapping screws are usually made of 20Mn, 20MnTiB, SCM435, SCR435 and SWRCH35K steel .
SHANGHAI ZINSN INDUSTRIAL CO.,LTD., which applies this technology, has been producing locking self-tapping screws for many years, with stable and reliable product quality. However, it must be noted that the oil and gas carried by the uncleaned locking self-tapping screws has a significant impact on the atmosphere in the furnace. If it is not cleaned, it will directly affect the atmosphere and control accuracy of the furnace. Also pay attention to whether there is residue on the mesh belt when the furnace is empty. Yellow powder, if any, the cleaning of locking self-tapping screws should be taken seriously. Since the mesh belt furnace does not have air cooling conditions after carburizing, low-alloy steel or carbon steel should be used as far as possible to carburize direct quenching process.

Self Tapping Screws