Casting material for nuclear power steam turbine abrasion-resisting pump block and manufacturing method of casting material

Abstract

The invention discloses a manufacturing method of a casting material applied to a nuclear power steam turbine abrasion-resisting pump block. The manufacturing method includes the following steps that by mass percent, 2%-3.5% of aluminum, 7%-8% of iron, 1%-3% of manganese, 5%-7% of nickel and the balance copper are placed into a main frequency furnace, are heated to 1100 DEG C, are completely melted and then are subject to heat preservation. According to the casting material for the nuclear power steam turbine abrasion-resisting pump block, titanium boride ceramic particles are added into a traditional bronze material to be used for improving the hardness of a casting alloy material; and the corresponding rare earth element, namely lanthanum or cerium, is appropriately added to be used for further refining and improving the size particle organization structure of alloy internal materials, the strength and the hardness of the alloy material can be achieved without further forging or heat treatment of the material, and the requirement for the material for the nuclear power steam turbine abrasion-resisting pump block is further met.

Description

technical field

[0001] The invention relates to the field of alloy materials, in particular to a casting material applied to wear-resistant pump blocks of nuclear power steam turbines and a manufacturing method thereof. Background technique

[0002] Bronze material has good properties such as ductility and forgeability, so it is widely used. It is mainly used in the technical field of nuclear power steam turbines, specifically for forging various valve blocks and wear-resistant pump blocks. However, with the vigorous development of the nuclear power industry, the market demands more and better materials. Due to the defects caused by forging, the bronze ingots currently used are increasingly unable to meet the domestic and foreign high-standard pump and valve alloy ingots. demand. In addition, due to the internal structure of the material, the bronze material cast by sand casting is very easy to produce air hole surface inclusions, and it is not easy to secondary molding. ...

Examples

Embodiment 1

[0019] A method for preparing a casting material applied to a wear-resistant pump block of a nuclear power steam turbine, comprising the following steps:

[0020] 1), according to the ratio of aluminum: 2.4%, iron: 7.2%, manganese: 1.5%, nickel: 5.5%, copper: the mass percentage of the balance, configure the raw materials, put them in a power frequency electric furnace, and heat them to 1100 degrees , after completely melting and keeping warm;

[0021] 2), add the rare earth element lanthanum or cerium: 1.5%, by mass percentage, in the middle of the alloy solution being kept warm, open the vibrating device and the stirring device, the vibration frequency of the vibrating device is: 10 times / second; the stirring rate of the stirring device is : 150 rpm, stirring time: 5-10 minutes;

[0022] 3) Add 6.5% of titanium boride with a particle size greater than 100 microns to less than 200 microns, by mass percentage, into the alloy solution, and stir again at the same time, the stir...

Embodiment 2

[0027] Embodiment 2 is different from Embodiment 1 only in the ratio of raw materials, and is the same in other respects. Therefore, only the differences will be described below.

[0028] The mass percentage of each component in step 1) is: aluminum: 3.0%, iron: 7.6%, manganese: 2%, nickel: 6%, copper: balance.

[0029] The mass percentage of the rare earth element lanthanum or cerium in step 2) is: 2%.

[0030] The mass percentage of titanium boride in step 3) is: 7%.

[0031] According to the second embodiment, basically the same effect as that of the first embodiment can be achieved.

Embodiment 3

[0033] Embodiment 3 is different from Embodiment 1 and 2 only in the ratio of raw materials, and is the same in other respects. Therefore, only the differences will be described below.

[0034] The mass percent of each component in step 1) is: aluminum: 3.2%, iron: 7.8%, manganese: 2.5%, nickel: 6.5%, copper: balance.

[0035] The mass percentage of the rare earth element lanthanum or cerium in step 2) is: 2.5%.

[0036] The mass percentage of titanium boride in step 3) is: 7.5%.

[0037] According to the third embodiment, basically the same effects as those of the first and second embodiments can be achieved.

[0038] Material experiment data performance comparison table:

[0039]

[0040] It can be seen from the above table that the hardness and yield of the material are improved and the porosity of the material is reduced through the casting of the material in the present invention.

technical field

[0001] The invention relates to the field of alloy materials, in particular to a casting material applied to wear-resistant pump blocks of nuclear power steam turbines and a manufacturing method thereof. Background technique

[0002] Bronze material has good properties such as ductility and forgeability, so it is widely used. It is mainly used in the technical field of nuclear power steam turbines, specifically for forging various valve blocks and wear-resistant pump blocks. However, with the vigorous development of the nuclear power industry, the market demands more and better materials. Due to the defects caused by forging, the bronze ingots currently used are increasingly unable to meet the domestic and foreign high-standard pump and valve alloy ingots. demand. In addition, due to the internal structure of the material, the bronze material cast by sand casting is very easy to produce air hole surface inclusions, and it is not easy to secondary molding. ...

Examples

Embodiment 1

[0019] A method for preparing a casting material applied to a wear-resistant pump block of a nuclear power steam turbine, comprising the following steps:

[0020] 1), according to the ratio of aluminum: 2.4%, iron: 7.2%, manganese: 1.5%, nickel: 5.5%, copper: the mass percentage of the balance, configure the raw materials, put them in a power frequency electric furnace, and heat them to 1100 degrees , after completely melting and keeping warm;

[0021] 2), add the rare earth element lanthanum or cerium: 1.5%, by mass percentage, in the middle of the alloy solution being kept warm, open the vibrating device and the stirring device, the vibration frequency of the vibrating device is: 10 times / second; the stirring rate of the stirring device is : 150 rpm, stirring time: 5-10 minutes;

[0022] 3) Add 6.5% of titanium boride with a particle size greater than 100 microns to less than 200 microns, by mass percentage, into the alloy solution, and stir again at the same time, the stir...

Embodiment 2

[0027] Embodiment 2 is different from Embodiment 1 only in the ratio of raw materials, and is the same in other respects. Therefore, only the differences will be described below.

[0028] The mass percentage of each component in step 1) is: aluminum: 3.0%, iron: 7.6%, manganese: 2%, nickel: 6%, copper: balance.

[0029] The mass percentage of the rare earth element lanthanum or cerium in step 2) is: 2%.

[0030] The mass percentage of titanium boride in step 3) is: 7%.

[0031] According to the second embodiment, basically the same effect as that of the first embodiment can be achieved.

Embodiment 3

[0033] Embodiment 3 is different from Embodiment 1 and 2 only in the ratio of raw materials, and is the same in other respects. Therefore, only the differences will be described below.

[0034] The mass percent of each component in step 1) is: aluminum: 3.2%, iron: 7.8%, manganese: 2.5%, nickel: 6.5%, copper: balance.

[0035] The mass percentage of the rare earth element lanthanum or cerium in step 2) is: 2.5%.

[0036] The mass percentage of titanium boride in step 3) is: 7.5%.

[0037] According to the third embodiment, basically the same effects as those of the first and second embodiments can be achieved.

[0038] Material experiment data performance comparison table:

[0039]

[0040] It can be seen from the above table that the hardness and yield of the material are improved and the porosity of the material is reduced through the casting of the material in the present invention.

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