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Casting process and mechanical properties of stainless steel die castings
- May 11, 2018 -

In the manufacturing process of stainless steel die castings, the investment casting process is mainly used. In the process of operation, the fusible model is mainly made of fusible materials, and several layers of special fire-proof coatings are applied to the stainless steel die castings. After drying and hardening to form a monolithic shell, the model is then melted out of the shell with steam or hot water. The shell is then placed in a sand box, filled with dry sand, and the cast is placed The roasting furnace is subjected to high-temperature roasting. After the mold or the shell is fired, the molten metal is poured thereinto to obtain a casting.

Stainless steel die casting investment module of the dimensional accuracy requirements are very high, in the process of operation can generally reach CT4-6, the average precision investment castings although the high dimensional accuracy, but its consistency still needs to be improved (using The consistency of castings for high-temperature waxes is much higher.)

When the stainless steel die casting is used for die casting investment, it is mainly used in the production process that the cavity surface has a high degree of smoothness. Therefore, the surface finish of the investment die is also relatively high. In addition, the shell is made of a high-temperature resistant special binder and a refractory material made of a refractory material that is coated on the investment mold. The inner surface of the cavity that directly contacts the molten metal has a high degree of finish. Therefore, the surface finish of investment castings is higher than that of common castings.

Stainless steel die castings will, to a certain extent, have good resistance to oxidative direct corrosion and resistance to air oxidation at high temperatures, and can also be used as heat-resistant steel. This kind of steel has poor welding performance. When the Cr content is more than 16%, the as-cast microstructure is coarse. In the long-term heat preservation between 400-525° C. and 550-700° C., the “475° C.” brittle phase and the σ phase appear, making the steel brittle.

In the process of engineering application of stainless steel die castings, the main purpose is to use mechanical properties in the process of operation. Although these steels are used in the atmosphere corrosion and milder corrosion media, they have good resistance. Corrosion ability, but its corrosion performance is often not as a test item. Its chemical composition range is: Cr13%-17%, Ni2%-6%, C≤0.06%. The metallurgical structure is mainly low-carbon lath martensite. Therefore, it has excellent mechanical properties. Its strength index is more than twice that of austenitic stainless steel, and it also has good process performance, especially welding performance.