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Tool Use and Tempering Treatment in Stainless Steel Casting

The geometrical parameters of the tool for stainless steel precision castings in operation require that the geometrical shape of the cutting part of the tool should be considered from the selection of the front and rear angles. Improving the surface roughness of the cutting part of the tool for stainless steel precision castings can reduce the resistance of chip curling and improve the resistance of the tool. Cost.
 
Stainless steel precision castings require tool rod materials in the manufacture. Because of its large cutting force in use, the tool rod must have sufficient strength and rigidity to avoid chattering and deformation in the cutting process. This requires the selection of appropriate large cross-sectional area of the tool rod and the use of high strength materials to manufacture the tool rod.
 
During the tempering process of stainless steel investment castings, the stress produced during quenching can be effectively eliminated to a certain extent. After quenching, the metastable structure of martensite and retained austenite can be decomposed and transformed. The tempering temperature of products usually falls below the eutectoid transformation temperature, with the highest tempering temperature being about 650 degrees C and the holding time not less than 2 hours.
 
As the tempering temperature of stainless steel investment castings increases, the martensite of stainless steel investment castings needs to precipitate carbon from the supersaturated state of carbon, which will effectively form dispersed and fine carbides. According to the requirements of casting performance, tempering temperature can be divided into three types: low, medium and high.
 
In the process of processing materials for stainless steel precision castings, impurities such as dirt and oil need to be removed. The product's return charge must effectively spray out its sand and oxide scales. After cleaning, it can be put into the furnace for smelting. After the steel melting pool is completely melted out, low carbon ferromanganese and low carbon ferrosilicon are put into alloying and pre-deoxidation as required.
 
The addition duration, time and method of various alloying elements in stainless steel investment castings are closely related to their recovery rate. The order and time of alloying elements are determined according to the following requirements: the alloying elements should be melted as soon as possible to make the composition uniform.