Resistance to oxidation of heat resistant castings and their advantages in use

- Jul 25, 2018-

Heat-resistant castings mainly used in production process of the fusible materials meltability model, on which the coated with several layers of tailor-made refractory coating, effective after the drying and hardening formed a whole shell, again USES the steam or hot water from the melt in the shell model, and then put type shells in the sand, dry sand by filling in all round its modelling, finally will be cast into the furnace after high temperature roasting (such as high strength shell, can need not modelling and will release the shell directly after roasting), cast type or shell after roasting, and are casting in pouring molten metal.


Heat resistant castings mainly refers to the work under high temperature, when making use of its products mainly in the power plant, boiler, gas turbines, internal combustion engines, and aircraft engine is closely related to the technological progress of each industrial sector because of all kinds of machines, devices use of temperature and stress is different, and different environment, so adopted by the steel types are different.

Heat resistant castings can significantly improve their ability to resist oxidation at high temperature and change the matrix of cast iron into single-phase ferrite.In addition, silicon and aluminum can increase the phase transition point, so that it does not occur solid phase transition at the working temperature, which can reduce the volume change and microcracks caused thereby.Chromium can form stable carbide and improve the thermal stability of cast iron.Commonly used heat - resistant cast iron are medium - silicon cast iron, high - chromium cast iron, nickel - chromium cast iron and so on.