Preparation method of pure-nickel valve body casting

A pure nickel casting technology, applied in the field of preparation of pure nickel valve body castings, can solve the problems of low efficiency and high production cost, and achieve the effect of improving production efficiency and reducing production cost

Active Publication Date: 2019-06-11
SHANGHAI ZHONGZHOU SPECIAL ALLOY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the defects of low efficiency and high production cost when using the method of vacuum smelting to prepare pure nickel valve body castings in the prior art, and provide a preparation method of pure nickel valve body castings

Method used

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  • Preparation method of pure-nickel valve body casting
  • Preparation method of pure-nickel valve body casting
  • Preparation method of pure-nickel valve body casting

Examples

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Effect test

Embodiment 1

[0049] A kind of preparation method of pure nickel valve body casting, such as figure 1 As shown, it includes the following steps:

[0050]Protect 100kg of pure nickel master alloy with argon gas, and use a 500kW non-vacuum intermediate frequency induction furnace for melting under non-vacuum conditions to obtain molten steel. The smelting temperature is 1530° C. to 1560° C., the smelting is 50 minutes, and the liquid surface of the molten steel is covered with a covering agent, and the height of the covering agent on the surface of the molten steel is 10 mm. When the temperature of the molten steel reaches 1530-1540°C, deoxidation treatment is carried out. First add deoxidizer Ti (purity greater than 99%, dosage is 0.05% of the total mass of molten steel) to the molten steel, and deoxidize for 2 minutes; then add deoxidizer Al (purity greater than 99%, consumption is 0.05% of the total mass of molten steel), deoxidation 1min; finally add deoxidizer Ni-Mg alloy (the content o...

Embodiment 2

[0052] A preparation method of pure nickel valve body casting, it comprises the steps:

[0053] Protect 100kg of pure nickel master alloy with argon gas, and use a 500kW non-vacuum intermediate frequency induction furnace for melting under non-vacuum conditions to obtain molten steel. The smelting temperature is 1530° C. to 1560° C., smelting for 50 minutes, and the liquid surface of the molten steel is covered with a covering agent, and the height of the covering agent on the surface of the molten steel is 11 mm. When the temperature of molten steel reaches 1530-1540°C, deoxidation treatment is carried out, first add deoxidizer Ti (purity greater than 99%, dosage is 0.1% of the total mass of molten steel) to molten steel, and deoxidize for 2 minutes; then add deoxidizer Al (purity greater than 99%, the consumption is 0.1% of the total mass of molten steel), deoxidation 1min; finally add deoxidizer Ni-Mg alloy (the content of Mg is 20% of the total mass of deoxidizer Ni-Mg all...

Embodiment 3

[0055] A preparation method of pure nickel valve body casting, it comprises the steps:

[0056] Protect 100kg of pure nickel master alloy with argon gas, and use a 500kW non-vacuum intermediate frequency induction furnace for melting under non-vacuum conditions to obtain molten steel. The smelting temperature is 1530° C. to 1560° C., smelting for 50 minutes, and the liquid surface of the molten steel is covered with a covering agent, and the height of the covering agent on the surface of the molten steel is 12 mm. When the temperature of molten steel reaches 1530-1540°C, deoxidation treatment is carried out. First add deoxidizer Ti (purity greater than 99%, dosage is 0.08% of the total mass of molten steel) to the molten steel, and deoxidize for 2 minutes; then add deoxidizer Al (purity greater than 99%, the consumption is 0.08% of the total mass of molten steel), deoxidation 1min; finally add deoxidizer Ni-Mg alloy (the content of Mg is 20% of the total mass of deoxidizer Ni-...

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Abstract

The invention discloses a preparation method of a pure-nickel valve body casting. The method comprises the following steps that 1, on the condition of inert atmosphere and non-vacuum, a pure-nickel mother alloy is smelted, and molten steel is prepared; 2, the surface of the molten steel is covered with a coverage agent; 3, deoxidization treatment is carried out under the effect of a deoxidizing agent, and deoxidized molten steel is prepared, wherein the deoxidizing agent comprises a deoxidizing agent Ti, a deoxidizing agent Al and a deoxidizing agent Ni-Mg alloy; and the adding sequence of thedeoxidizing agent is the deoxidizing agent Ti, the deoxidizing agent Al and then the deoxidizing agent Ni-Mg alloy; and 4, in a die shell, the deoxidized molten steel is poured, so that the pure-nickel valve body casting is prepared, wherein the pouring temperature is 1450-1500 DEG C, and the temperature of the die shell is 200-700 DEG C. According to the preparation method, smelting and pouringof the pure-nickel valve body casting is achieved on the non-vacuum condition, the production cost of the casting is reduced, the production efficiency is also improved substantially, the quality meets the national standard, and the casting is applicable to industrialized production.

Description

technical field [0001] The invention relates to a preparation method of a pure nickel valve body casting. Background technique [0002] Due to its excellent corrosion resistance, pure nickel materials are often used in various harsh corrosive environments in the chemical industry, and chemical equipment also has high quality requirements for pure nickel castings. Compared with other nickel alloys, pure nickel is easier to absorb oxygen and gas during the smelting stage. In order to solve the problem of easy oxidation and gas absorption of pure nickel, the best melting method is vacuum melting. [0003] At present, the industry prepares pure nickel castings with a wide range of usage and excellent performance, which are generally melted in vacuum melting furnaces, and then cast into castings. However, the price of vacuum furnace equipment is generally high, and the efficiency of vacuum smelting is also low. For some enterprises that do not have vacuum equipment but need to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02C22B23/06
Inventor 王小元赵爱东
Owner SHANGHAI ZHONGZHOU SPECIAL ALLOY MATERIALS
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