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Super duplex stainless steel used on pump valve product and preparation method thereof

A duplex stainless steel, super technology, applied in the field of stainless steel, can solve the problems of not being able to further improve the corrosion resistance and mechanical properties of duplex stainless steel, limit the corrosion resistance and mechanical properties, reduce the corrosion resistance of duplex stainless steel, and achieve blunt The effect of changing the range of chemical current, improving corrosion resistance and mechanical properties, and not being easy to crack

Active Publication Date: 2014-12-10
ZHANGJIAGANG FEILANG PUMP & VALVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the pump and valve products are generally made of austenitic stainless steel or duplex stainless steel. Duplex stainless steel has a two-phase structure - austenitic structure and ferrite structure, which makes duplex stainless steel have both austenitic stainless steel The characteristics of the ferritic stainless steel and the characteristics of the ferritic stainless steel, so the application of the duplex stainless steel is particularly extensive; During the smelting process, alloying elements generally gather in the ferrite structure, so the ferrite structure will change during the smelting process, while the austenite structure will basically not change, and the corrosion resistance and mechanical properties of duplex stainless steel cannot be further improved , which limits the improvement of its corrosion resistance and mechanical properties
In addition, in the process of smelting and solidification, a large number of σ-equal brittle phases and γ-phases will be precipitated in the crystal structure, and the places where a large number of σ-equal brittle phases and γ-phases precipitate are Cr and Mo-poor areas, which will make duplex stainless steel It is easy to crack during forging, and pitting corrosion generally occurs near the σ phase and γ phase, which will greatly reduce the corrosion resistance of duplex stainless steel, so this type of pump and valve products are easy to be corroded, and the service life of pump and valve products is longer short

Method used

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  • Super duplex stainless steel used on pump valve product and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] The super duplex stainless steel used in the pump valve product described in this embodiment is characterized in that its composition and weight percentage of each component are as follows: nickel: 6.5%, chromium: 25%, molybdenum: 4%, copper: 0.8 %, nitrogen: 0.25%, carbon ≤ 0.02%, manganese ≤ 1%, silicon ≤ 1%, phosphorus ≤ 0.03%, sulfur ≤ 0.025%, cerium: 0.05%, the balance is iron.

[0010] The preparation method of the above-mentioned super duplex stainless steel is as follows: put the relevant materials used in the intermediate frequency furnace for smelting, and after the materials are completely melted to form a molten metal melt, the molten metal melt is sampled and analyzed and the carbon content is adjusted so that the carbon content is low The weight percentage does not exceed 0.02%, and then pour the covering agent into the intermediate frequency furnace. The scientific name of the covering agent in this embodiment is: slagging agent. The main raw material of the ...

Embodiment 2

[0015] The super duplex stainless steel used in the pump valve product described in this embodiment is characterized in that its composition and weight percentage of each component are as follows: nickel: 8.5%, chromium: 24%, molybdenum: 3.5%, copper: 0.5 %, Nitrogen: 0.3%, Carbon ≤0.01%, Manganese ≤1%, Silicon ≤1%, Phosphorus ≤0.03%, Sulfur ≤0.02%, Cerium: 0.2%, the balance is iron.

[0016] The preparation method of the above-mentioned super duplex stainless steel is as follows: put the relevant materials used in the intermediate frequency furnace for smelting, and after the materials are completely melted to form a molten metal melt, the molten metal melt is sampled and analyzed and the carbon content is adjusted so that the carbon content is low The weight percentage does not exceed 0.02%, and then pour the covering agent into the intermediate frequency furnace to completely cover the surface of the molten metal and increase the furnace temperature to 1500°C for deoxidation an...

Embodiment 3

[0019] The super duplex stainless steel used in the pump valve product described in this embodiment is characterized in that its composition and weight percentage of each component are as follows: nickel: 7%, chromium: 26%, molybdenum: 3%, copper: 1 %, nitrogen: 0.2%, carbon ≤ 0.02%, manganese ≤ 1%, silicon ≤ 1%, phosphorus ≤ 0.02%, sulfur ≤ 0.025%, cerium: 0.1%, and the balance is iron.

[0020] The preparation method of the above-mentioned super duplex stainless steel is as follows: put the relevant materials used in the intermediate frequency furnace for smelting, and after the materials are completely melted to form a molten metal melt, the molten metal melt is sampled and analyzed and the carbon content is adjusted so that the carbon content is low The weight percentage does not exceed 0.02%, and then pour the covering agent into the intermediate frequency furnace to completely cover the surface of the molten metal melt and increase the temperature in the furnace to 1505°C fo...

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Abstract

The invention discloses super duplex stainless steel used on a pump valve product and a preparation method thereof. The super duplex stainless steel comprises the following components in percentage by weight: 6.5-8.5% of nickel, 24-26% of chromium, 3-4% of molybdenum, 0.5-1% of copper, 0.2-0.3% of nitrogen, less than or equal to 0.02% of carbon, less than or equal to 1% of manganese, less than or equal to 1% of silicon, less than or equal to 0.03% of phosphorus, less than or equal to 0.025% of sulfur, 0.05-0.2% of cerium and the balance of iron. The preparation method comprises the following steps: smelting; deoxidizing and slagging; deoxidizing for the second time; and finally, adding ferromanganese and a refining agent, and after ferromanganese and the refining agent are fully smelted in smelting metal liquor, pouring to obtain the super duplex stainless steel. The super duplex stainless steel disclosed by the invention has the advantages that the super duplex stainless steel has good corrosion resistance and mechanical property, so that the service life of pump valve products is greatly prolonged.

Description

Technical field [0001] The invention relates to the field of stainless steel, in particular to a super duplex stainless steel used in pump valve products and a preparation method thereof. Background technique [0002] With the rapid development of modern industry in our country, the application of various fluids with strong acid characteristics makes the requirements for the manufacturing materials of pump and valve products higher and higher. Pump and valve products not only have to withstand the hydraulic shock of the fluid, but also Withstand the erosion of various fluids with strong acid characteristics. At present, most of the pump valve products are generally made of austenitic stainless steel or duplex stainless steel. Duplex stainless steel has two-phase structure-austenitic structure and ferrite structure, which makes duplex stainless steel have both austenitic stainless steel At the same time, it also has the characteristics of ferritic stainless steel. Therefore, the ...

Claims

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Application Information

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IPC IPC(8): C22C38/44
Inventor 张莉华
Owner ZHANGJIAGANG FEILANG PUMP & VALVE
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