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AOD (argon oxygen decarburization) refining and smelting process for preparing super duplex stainless steel pump valve

A duplex stainless steel, process technology, applied in the AOD refining method of valves, super duplex stainless steel pump field, can solve the problems of short service life, single structure of pumps and valves, no super corrosion resistance, etc., to improve the corrosion resistance Erosion, improved heat shrinkage, good welding performance

Active Publication Date: 2015-03-25
北票电力铸钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the above problems, provide an AOD refining method for preparing super duplex stainless steel pumps and valves, and solve the problems of existing pumps and valves with single organization, no super corrosion resistance, and short service life. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An AOD refining and smelting process for preparing super duplex stainless steel pump valves, the smelting process is

[0020] (1) Melt the steel in the intermediate frequency induction furnace and raise it to 1650°C, transfer the molten steel to the AOD furnace for refining, and then inject the mixed gas of oxygen and nitrogen;

[0021] (2) The initial injection ratio of oxygen and nitrogen is 6:1, and the flow rate of nitrogen is 50M3 / h;

[0022] (3) As the carbon content decreases, the injection ratio of oxygen and nitrogen is adjusted, and finally the nitrogen flow rate is adjusted to 120 M3 / h;

[0023] (4) After 1.2 hours of gas injection, the nitrogen content is 2 kg per ton of molten steel, and the volume occupies about 1.6 cubic meters. It exists in the steel, and finally super duplex stainless steel molten steel is obtained.

[0024] When refining 3A duplex steel, the internal control standard for the chemical composition of duplex stainless steel is

[0025] ...

Embodiment 2

[0030] An AOD refining and smelting process for preparing super duplex stainless steel pump valves, the smelting process is

[0031] (1) Melt the steel in the intermediate frequency induction furnace and raise it to 1650°C, transfer the molten steel to the AOD furnace for refining, and then inject the mixed gas of oxygen and nitrogen;

[0032] (2) The initial injection ratio of oxygen and nitrogen is 6:1, and the flow rate of nitrogen is 50M3 / h;

[0033] (3) As the carbon content decreases, the injection ratio of oxygen and nitrogen is adjusted, and finally the nitrogen flow rate is adjusted to 120 M3 / h;

[0034] (4) After 1.2 hours of gas injection, the nitrogen content is 2 kg per ton of molten steel, and the volume occupies about 1.6 cubic meters. It exists in the steel, and finally super duplex stainless steel molten steel is obtained.

[0035] When refining 3A duplex steel, the internal control standard for the chemical composition of duplex stainless steel is

[0036] ...

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PUM

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Abstract

The invention discloses an AOD (argon oxygen decarburization) refining and smelting process for preparing a super duplex stainless steel pump valve. The AOD refining and smelting process comprises the following steps of heating to 1650 DEC C after steel is melted to approach target ingredients by a medium-frequency induction electric furnace; blending molten steel in an AOD furnace and refining; then injecting nitrogen to ensure that nitrogen exists in steel, thereby finally obtaining molten super duplex stainless steel. With the adoption of the AOD refining method disclosed by the invention, the contents of harmful elements of sulphur, phosphorus and the like in the molten steel can be reduced, thus greatly decreasing the cost of stainless steel; the prepared steel is good in welding performance and anti-fatigue performance, and the heat-cracking, cold-cracking and quenching-cracking tendencies are reduced, thus really achieving energy-saving, consumption-reducing, green and environment-friendly purposes.

Description

technical field [0001] The invention relates to a smelting process of super duplex stainless steel pumps and valves, in particular to an AOD refining method for preparing super duplex stainless steel pumps and valves used in nuclear power, nuclear submarines, ships, seabed transportation, seawater desalination, etc. Background technique [0002] At present, domestic and foreign pump and valve stainless steel castings mostly use single-phase stainless steel such as ferrite and austenite. The single-phase austenitic structure has been widely used in valve castings in Europe and the United States; the ferritic-austenitic series duplex stainless steel is used to manufacture hull steel plates and forgings (rudder shafts, rudder posts, rudder tips, tail shafts) of high-speed ships. , intermediate shaft, etc.) and castings (propeller, valve body, corrosion-resistant impeller, etc.), there are problems such as single organization, no super corrosion resistance, and short service lif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/068C21C7/064C21C7/10C22C38/44
Inventor 王庆安丁树坤王子强王星伟王星海丁云鹏程国新王星强张进福李兴才
Owner 北票电力铸钢有限公司