Casting forming method for martensitic stainless steel casting

Abstract

The invention provides a casting forming method for a martensitic stainless steel casting. The casting forming method for the martensitic stainless steel casting comprises the following steps of providing a solid particle-shaped protective object, preparing a shell according to a pattern shape in a pre-drawn design drawing, burying the shell and an alloy material by using the protective object after the alloy material smelted into a liquid state is poured into the shell, and taking the casting out of the shell after the alloy material is condensed to form the casting. By the adoption of the technical scheme provided by the invention, the condensation process of the casting is completed in a closed space, and a high-temperature-resistant sand grain is a good heat conductor, so that heat on the surface of the shell is absorbed, the condensation speed of the alloy material is increased, the production efficiency is improved, the relation between the alloy material and external environment air is shielded, the alloy material can be effectively prevented from being oxidized, corresponding oxides can be prevented from being mixed in a casting material, the surface quality of the casting is improved, a metallographic structure of the casting material is prevented from being damaged, and the comprehensive performance of the casting is improved.

Description

Technical field [0001] The present invention relates to the field of casting process, in particular to a martensite-based method for casting a martensite stainless steel casting. Background technique [0002] In the molten casting production process, in order to ensure the casting, the casting, cold separation defects, casting castings, the melting type shell is high, the alloy liquid temperature is also high, and the alloy material for pouring is different. The preheating temperature of the housing, the difference between the process parameters of the casting temperature, when the alloy material is pouring alloy material, the alloy material is in direct contact with air during condensation, and some of the oxidized elements in the casting. If the elements such as carbon, silicon, manganese, etc. are easily oxidized to oxygen in the air, and the resulting oxide is inclusted in the casting material, forming a pit, a pit, a pit, forming a star-ray on the surface of the casting, whi...

AI Technical Summary

Problems solved by technology

[0002] In the production process of investment castings, in order to ensure the pouring of castings and reduce under-casting and cold shut defects, when pouring castings, the preheating temperature of the melting mold shell is higher, and the temperature of the alloy liquid is also higher. In addition, for casting different alloy materials, The process parameters of shell preheating temperature and pouring temperature are very different. When pouring alloy materials, during the condensation process of alloy materials, the surface of the incompletely formed casting is directly in contact with the air, and some easily oxidizable elements in the casting, Elements such as carbon, silicon, manganese, etc. are easily oxidized with oxygen in the air under high temperature conditions, and the oxides formed will be mixed in the casting material, forming pits dotted on the surface of the casting, which not only affects the appearance quality of the casting , so that these elements are missing in the final casting material, destroying the metallographic structure of the casting material, and affecting the physical, chemical and service properties of the casting

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