Forging Heat Treatment Process – Normalising for Open and Closed Die Forgings
importance of “Normalising” in Forged Components while Quality Forging Process Manufacturing
In this process Normalising while Heat Treatment Process of Forging– the part (component) has to heated 30 0C to 40 0C more temperature then AC3 and ACm temperature. Part maintains on this temperature, Because of this steel have been totally austenitic. Then after part cool down in atmosphere.
This process performs to increase machine ability and tensile strength of forgings and castings. Also useful to remove stresses generated due to forging, hammering, bending and cold working. Also to achieve uniform structure, relieve stress and increase toughness. Steel has been hard and brittle due to cold working because of that it is unsuitable for forging. Normalising is also useful to remove deformations generated due to hot working.
This process increases Yield point, ultimate tensile strength and impact strength. This is a fast process. Normally used for big castings, forgings and low carbon steel. Cooling rate decided according to size and shape of the part. We can achieve hardness till 140 to 240 BHN.
Normalising Process Is Performs For Following Purposes:
- To achieve uniform structure
- To refine grain size
- To achieve required strength of heavily soft and ductile steel
- To reduce internal stress
- To get better weld structure
- To achieve hard and strong steel than full annealing
- To enhance engineering properties of steel
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