Heat treatment of precision castings
Due to the different purposes of precision castings, there are many heat treatment methods, which can be basically divided into two categories. The first is that the structure will not change or should not be changed by heat treatment, and the second is that the basic structure will change. The first heat treatment procedure is mainly used to relieve internal stress caused by different cooling conditions and conditions during stainless steel casting. Due to heat treatment, the structure, strength and other mechanical properties of precision castings will not change significantly.
For the second type of heat treatment, al Qaeda has undergone major changes, which can be roughly divided into five categories:
1. Softening annealing: Its purpose is mainly to decompose carbides, reduce their hardness and improve processability. For ductile iron, the aim is to obtain a more ferritic structure.
2. Normalizing treatment: The main purpose is to obtain pearlite and sorbite to improve the mechanical properties of stainless steel castings.
3. Quenching treatment: mainly to obtain higher hardness or wear resistance, and at the same time to achieve high surface wear resistance.
4. Surface hardening treatment: mainly to obtain a hardened surface layer, and at the same time to obtain high surface wear resistance of precision castings.
5. Precipitation hardening treatment: mainly to obtain high strength without sharp change in elongationFenghua Xinke Precision Casting Co., Ltd is a enterprise specializing in the manufacturing of Silica Sol Castings,Lost Wax Investment Castings,Coated Sand Castings and finished products in stainless steel,carbon steel and low alloy steel. Our company is a world class manufacturer and supplier of investment castings with silica sol or water glass process in China. We both have our own steel casting foundry and CNC machining factory,which enable us to supply both precision castings and finished products with an annual production capacity of over 20,000 tons. As OEM Agricultural Casting Manufacturers and Custom Construction Machinery Casting Factory, our products cover a wide range of industries including train & railway, automobile & truck, construction machinery, mining machinery, forklift, agricultural machinery, shipbuilding, petroleum machinery, construction, valve and pumps, electric machine ,hardware, power equipment and so on. We are capable to custom Forklift Casting according to customers’ drawings or samples.We are familiar with the various industrial standards, such as Chinese GB, American ASTM, AISI , German DIN, French NF, Japanese JIS, British BS, Australian AS and Association of American Railroads (AAR ) and other industrial standards. Our products are mainly exported to over 30 countries such as USA,Germany,Japan,Spain,Italy,UK,Korea,Australia, Canada and etc.
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