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Duplex stainless steel used on pump valve products

A technology of duplex stainless steel and products, applied in the field of duplex stainless steel, can solve the problems of corrosion and affect the normal production of chemical enterprises, and achieve the effect of high corrosion resistance

Inactive Publication Date: 2010-03-31
ZHANGJIAGANG FEILANG PUMP & VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of my country's chemical industry, all kinds of granular strong acid media have higher and higher requirements for the manufacturing materials of pump and valve products. The manufacturing materials of existing domestic pump and valve products generally use Ni-Cr type austenite Stainless steel, the pump and valve products made of this material are easily corroded by various strong acid media with particles, and the service life is as long as 1-2 months, as little as a few days, and it needs to be maintained and replaced frequently , seriously affected the normal production of chemical enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] The duplex stainless steel used in pump and valve products has the following composition and weight percentage of each component: C: 0.03%, Mn: 1.5%, Si: 1%, P: 0.04%, S: 0.02%, Cr: 23.5% , Ni: 6.5%, Mo: 3.5%, Cu: 1%, N: 0.3%, and the balance is Fe.

Embodiment 2

[0010] The duplex stainless steel used in pump and valve products has the following composition and weight percentage of each component: C: 0.02%, Mn: 1%, Si: 0.5%, P: 0.02%, S: 0.01%, Cr: 22% , Ni: 5%, Mo: 3%, Cu: 0.5%, N: 0.2%, and the balance is Fe.

Embodiment 3

[0012] The duplex stainless steel used in pump and valve products has the following composition and weight percentage of each component: C: 0.03%, Mn: 1.5%, Si: 1%, P: 0.04%, S: 0.02%, Cr: 21% , Ni: 4.5%, Mo: 2.5%, Cu: 1%, N: 0.1%, and the balance is Fe.

[0013] The smelting process of the duplex stainless steel used in the pump and valve products in the above three embodiments is the same. First, charge is added to the smelting furnace. After the charge forms a solution in the smelting furnace, chromium and molybdenum are added to the smelting furnace. , nickel, after the solution is formed, immediately add the covering agent to make slag, after the slag is formed, stir it fully, and then take a sample of the molten steel for analysis, if the analysis result finds that the slag is too thin or too thick, remove the slag and make a new slag. If the analysis results find that the slag meets the requirements, deoxidize the slag by using Si-Ca powder diffusion deoxidation, the we...

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PUM

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Abstract

The invention discloses duplex stainless steel with strong corrosion resistance, which is used on pump valve products. The duplex stainless steel comprises the following composition by weight percent:less than or equal to 0.03% of C, less than or equal to 1.5% of Mn, less than or equal to 1% of Si, less than or equal to 0.04% of P, less than or equal to 0.02% of S, 21-23.5% of Cr, 4.5-6.5% of Ni,2.5-3.5% of Mo, less than or equal to 1% of Cu, 0.1-0.3% of N, and the balance Fe. The invention has the advantages that compared with Ni-Cr type austenitic stainless steel, the duplex stainless steel used on the pump valve products has very high corrosion resistance, yield strength and wear resistance.

Description

technical field [0001] The invention relates to a duplex stainless steel, in particular to a duplex stainless steel used in pump and valve products. Background technique [0002] With the rapid development of my country's chemical industry, all kinds of granular strong acid media have higher and higher requirements for the manufacturing materials of pump and valve products. The manufacturing materials of existing domestic pump and valve products generally use Ni-Cr type austenite Stainless steel, the pump and valve products made of this material are easily corroded by various strong acid media with particles, and the service life is as long as 1-2 months, as little as a few days, and it needs to be maintained and replaced frequently , Seriously affected the normal production of chemical enterprises. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a duplex stainless steel with strong corrosion resistance used in pu...

Claims

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Application Information

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IPC IPC(8): C22C38/44
Inventor 陈世章
Owner ZHANGJIAGANG FEILANG PUMP & VALVE