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A kind of high-silicon-nickel-copper alloy rotary casting and its casting method

A technology of high-silicon-nickel-copper and rotators, which is applied in the field of high-silicon-nickel-copper alloy rotators and their castings. It can solve the problems of coarse grain structure, low yield, and easy cracking of castings, and eliminate component segregation. and inclusions, high product yield, and dense structure and grain

Active Publication Date: 2019-10-08
SHANGHAI ZHONGZHOU SPECIAL ALLOY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the problems of silica sol investment casting and centrifugal casting in the prior art. During the production process, the molten steel is oxidized, which leads to inclusions and serious discontinuous structures in the casting matrix, and the products produced are very easy to form internal Porosity, slag inclusion and porosity, extremely low yield, coarse crystal grains of castings, easy to form cracks, and comprehensive performance of the product cannot reach the international advanced level. A high-silicon-nickel-copper alloy rotary casting and its casting are provided. method
Casting method of the present invention can be used for producing the high-silicon-nickel-copper alloy casting with the step of difference in wall thickness, also can be used for producing the high-silicon-nickel-copper alloy casting with larger diameter (more than 12 inches), the method solves the problem of molten steel oxidation and the problem that castings are extremely easy to crack, the yield of products produced by it is higher, and the structure and grain of the high-silicon-nickel-copper alloy gyratory castings of the present invention are more compact, eliminating component segregation and inclusions, and the gas content of the centrifugal casting matrix , impurity content have reached the level of ultra-vacuum precision casting, and the product has high hardness, high strength, high wear resistance and excellent anti-adhesion, high temperature resistance and corrosion resistance

Method used

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  • A kind of high-silicon-nickel-copper alloy rotary casting and its casting method
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  • A kind of high-silicon-nickel-copper alloy rotary casting and its casting method

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Embodiment 1

[0035] (1) Prepare the mold of the M25S material disc sleeve with an outer diameter of 6 inches and a height of 5.7 inches. When making the metal mold, R20 rounded corners are set at the corners of the steps (such as figure 1 ) to reduce casting stress and ensure hardness requirements.

[0036] (2) Preheating the metal mold until the temperature of the metal mold is 245° C., spraying the paint in the inner cavity of the metal mold;

[0037] (3) Close the mold, reinforce it with bolts, and wait for pouring;

[0038](4) Put M25S and ingredients C: 0.18-0.22% and Si: 3.8-4.2% that can guarantee the hardness requirements into the vacuum induction furnace, isolate the air, and melt the material in a vacuum state. When the molten steel is in the vacuum furnace After the internal refining is finished, pour the molten steel into the tundish that has been put into the furnace in advance and add an equal proportion of quaternary mold slag (a mixture of lime, fluorite, corundum, and mag...

Embodiment 2

[0040] (1) Prepare the mold of the M25S material guide sleeve with an outer diameter of 11.1 inches and a height of 10.2 inches, and directly straighten the outer steps and small step slopes (such as figure 2 ), its purpose is to form a gradually thickened structure from the outside to the inside, so as to reduce the phenomenon of excessive cooling caused by sudden changes in wall thickness, and facilitate the casting to solidify from the outside to the inside at a uniform speed.

[0041] (2) Preheating the metal mold until the temperature of the metal mold is 225° C., spraying the coating in the inner cavity of the metal mold;

[0042] (3) Close the mold, reinforce it with bolts, and wait for pouring;

[0043] (4) Put M25S and ingredients C: 0.18-0.22% and Si: 3.8-4.2% that can guarantee the hardness requirements into the vacuum induction furnace, isolate the air, and melt the material in a vacuum state. When the molten steel is in the vacuum furnace After the internal refi...

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Abstract

The invention discloses a high-silicon nickel-copper alloy rotary body type casting and a casting method thereof. The casting method comprises the following steps that (1) a metal mold of the high-silicon nickel-copper alloy rotary body type casting is prepared; (2) the metal mold is preheated, and coating is sprayed into an inner cavity of the metal mold later; (3) the mold is closed and reinforced for casting; and (4) a high-silicon nickel-copper alloy, carbon and silicon are smelted into molten steel in a vacuum induction furnace, the molten steel is placed into a tundish later, meanwhile the rotary speed and rotary time of a centrifugal machine are adjusted, the molten steel is subjected to centrifugal casting through an argon-shielding casting system, the casting temperature is 1450-1470 DEG C, the mold is drawn, the casting is taken out, and natural cooling is conducted. According to the casting method, the problem of M25S alloy centrifugal casting molten steel oxidation is solved, and the finished product ratio is higher; and casting structure crystalline grains are more compact, component segregation and inclusions are eliminated, and the product has high hardness, high strength, high wear resistance, good anti-adhesive performance, good anti-high-temperature performance and good corrosion resistance.

Description

technical field [0001] The invention relates to a high-silicon-nickel-copper alloy rotary casting and a casting method thereof. Background technique [0002] M25S is a Ni-Cu-Si-Fe-Mn series dispersion-strengthened nickel-copper alloy, also known as high-silicon Monel. The silicon content is as high as 4%, and the addition of silicon improves the strength, hardness and recrystallization temperature of the alloy, and improves the casting performance of the alloy. [0003] Conventional high-silicon-nickel-copper alloy castings generally adopt the process of precision casting (that is, silica sol investment casting) or centrifugal casting. Precision casting is to make a mold first, use this mold to make a wax model that matches the size and shape of the drawing, and then assemble the pouring riser, and then enter the shell making process. Finally, form a cavity that is the same as the requirements of the drawing and wrap the mold shell outside. After a period of time, it will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/00B22D27/00
Inventor 唐九和张庆东赵爱东
Owner SHANGHAI ZHONGZHOU SPECIAL ALLOY MATERIALS