Iron (steel) also contains components other than iron. "Pure iron" consisting of only iron is rarely found on the market. The representative non-iron element contained in iron (steel) is "carbon". The properties of steel change depending on the structure of iron and carbon contained in steel. For example, just as salt water evaporates rapidly to obtain fine crystals and evaporates slowly to obtain larger crystals, the iron and carbon structure also changes with the temperature and cooling rate of iron. We call the method of changing the iron structure to obtain the desired properties by using this property "heat treatment".
Normal heat treatment heats the entire part and must maintain the temperature for a long time. For this purpose, a large heating furnace and water cooling (oil cooling) equipment are required, which is costly. However, in the case of gears, for example, there are many cases where the entire part does not need to have strength and only the gear part needs strength. In this case, surface quenching or carburizing quenching and carburizing quenching are performed. High-frequency quenching, which heats only the surface of the part by electromagnetic induction close to the coil, is the most commonly used method for surface quenching. Summary Heat treatment has various purposes, such as hardening or softening metal materials and making them suitable for processing. In particular, quenching and tempering are common methods of gaining strength in metals and making parts resistant to fatigue, so it is best to remember the process and its effects.
Seamless Pipe
