1. Annealing:
The Steel parts produced by mechanical operation processes such as casting, rolling or drawing, extruding, etc. develop internal stresses and change their internal structure. This renders them hard and brittle.
Annealing is carried out for such parts to remove the internal stresses and make them more ductile and less brittle.
Annealing consists of heating of steel parts to a temperature at or near the critical temperature of 900 degrees Celsius hold it at that temperature for a suitable time and when allowed to cool slowly in the Furnace itself.
2. Normalizing:
Normalizing is a heat treatment process similar to annealing in which the Steel is heated to about 50 degrees Celsius above the upper critical temperature followed by air cooling.
This results in a softer state which will be lesser soft than that produced by annealing.
This heat treatment process is usually carried out for low and medium carbon steel as well as alloy steel to make the grain structure more uniform and relieve the internal stresses.
3. Hardening:
Hardening is a heat treatment process carried out to increase the hardness of Steel.
It consists of heating Steel components to the temperature within or above its critical range. Held at this temperature for a considerable time to ensure thorough penetration of heat at this temperature well inside the component and then allowed to cool separately by quenching in water oil or brine solution.
4. Tempering:
This heat treatment process is carried out for steel parts that have been already hardened, in order to reduce bitterness and unequal stress develop as a result of hardening.
This process reduces brittleness and hardness but improves the tensile strength of Steel.
It increases the toughness of Steel at the expense of loss of some hardness.
ABOUT KEVA
Keva Casting is a professional casting company that focuses on Construction, Machinery, Automobile, Hardware, Pipeline and many other industries.
We provide top quality products with the best service based on our complete production chain including our own mold design, advanced production techniques, and full management of the supply chain. Keva Casting has two factories located in Zhucheng, China's Shandong province.
We use "shell molding", which is a new technique that has been developed in recent years.This new technique has simplified production procedures and reduced air pollution compared with traditional sand casting and investment casting. Shell making and core making are faster to ensure production in enormous quantities. The dimensions and surface finishing are satisfactory for all kinds of industrial requirements. Besides supplying our own formwork & scaffolding systems, our casting products also supply OEM services in various industries.