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Duplex stainless steel alloy material and preparation method thereof

A technology of duplex stainless steel and alloy materials, applied in the field of steel alloy materials

Inactive Publication Date: 2011-12-28
JIANGSU JOSEN SPECIAL STEEL PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies in recent years have shown that after medium temperature aging in duplex stainless steel containing 25% Cr, compared with molybdenum, tungsten can delay the precipitation of brittle phases and reduce the embrittlement tendency of steel, but if the tungsten content is higher than 4%, It will also lead to embrittlement of steel due to the precipitation of Laves phase, but the precipitation range should be expanded at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A duplex stainless steel alloy material, the alloy material has the following composition and weight percentage: 0<C≤0.04%, S≤0.01%, Si≤1.0%, P≤0.015%, Cr: 21.5-24.5%, Ni: 3.0~5.5%, W: 0.3~1.5%, N: 0.150~0.25%, B: 0.001~0.01%, rare earth Ce or Y: 0.005~0.20%, and the rest is iron.

[0013] The preparation method of the alloy is as follows: the traditional smelting process is adopted, and the pure iron pipe is used to seal the master alloy when feeding, that is, the master alloy is prepared in advance. The composition of the master alloy is an alloy of Fe and Y, and the mass percentage of Y in the Fe-Y master alloy is 15%. After comprehensive measurement and calculation and batching and melting, it is poured and formed, and an economical duplex stainless steel alloy material is finally obtained. After hot forging and hot rolling in the as-cast state, and then solution treatment at 1050°C, the tensile fracture strength at room temperature is greater than 740MPa, ...

Embodiment 2

[0015] A duplex stainless steel alloy material, the alloy material has the following composition and weight percentage: C: 0.034%, S: 0.005%, Si: 0.60%, P: 0.013%, Cr: 22.9%, Ni: 4.6%, W : 0.51%, N: 0.19%, B: 0.004%, rare earth Ce or Y: 0.005-0.20%, and the rest is iron.

[0016] The preparation method of the alloy is as follows: adopting the traditional conventional smelting process method, and adopting the pure iron pipe sealing master alloy input method when feeding materials. That is, the master alloy is prepared in advance. The composition of the master alloy is an alloy of Fe and Y, and the mass percentage of Y in the Fe-Y master alloy is 15%. After comprehensive measurement and calculation and batching and melting, it is poured and formed, and finally a high-nitrogen and low-nickel duplex stainless steel alloy material is obtained. After hot forging and hot rolling in the as-cast state, and then solution treatment at 1050°C, the tensile fracture strength at room...

Embodiment 3

[0018] A duplex stainless steel alloy material, the alloy material has the following composition and weight percentage: C: 0.04%, S: 0.01%, Si: 1.0%, P: 0.015%, Cr: 24.5%, Ni: 5.5%, W : 1.5%, N: 0.25%, B: 0.01%, rare earth Ce or Y: 0.005~0.20%, and the rest is iron.

[0019] The preparation method of the alloy is as follows: adopting the traditional conventional smelting process method, and adopting the pure iron pipe sealing master alloy input method when feeding materials. That is, the master alloy is prepared in advance. The composition of the master alloy is an alloy of Fe and Y, and the mass percentage of Y in the Fe-Y master alloy is 15%. After comprehensive measurement and calculation and batching and melting, it is poured and formed, and finally a high-nitrogen and low-nickel duplex stainless steel alloy material is obtained. After hot forging and hot rolling in the as-cast state, and then solution treatment at 1050°C, the tensile fracture strength at room temp...

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Abstract

The invention discloses a duplex stainless steel material and a preparation method thereof, which have the following composition and mass percentage: 0<C≤0.04%, S≤0.01%, Si≤1.0%, P≤0.015%, Cr: 21.5-24.5% %, Ni: 3.0~5.5%, W: 0.3~1.5%, N: 0.150~0.25%, B: 0.001~0.01%, rare earth Ce or Y: 0.005~0.20%, and the rest is iron. The traditional smelting process method is adopted, and the pure iron pipe sealing master alloy input method is adopted when feeding materials, that is, the Fe-Ce master alloy or Fe-Y master alloy is prepared in advance, and after the comprehensive batching is melted, it is poured and formed, and finally obtained High performance economical duplex stainless steel alloy material. The object of the present invention is to provide a low-cost duplex stainless steel alloy material with good corrosion resistance and hot workability and a preparation method thereof.

Description

technical field [0001] The invention relates to a duplex stainless steel alloy material and a preparation method thereof, belonging to the technical field of iron and steel alloy materials. Background technique [0002] Duplex stainless steels consist of austenite and ferrite. The main components of duplex stainless steel are chromium, nickel, and molybdenum, and molybdenum is expensive as a ferrite forming element. In order to reduce costs, tungsten can be added to replace molybdenum in duplex stainless steel. Tungsten is a ferrite-forming element that acts similarly to molybdenum, but is about half as expensive as molybdenum. In addition, tungsten can withstand high temperature, and when dissolved in steel, it will form carbides with carbon to improve the strength of steel. In addition, tungsten can also increase the quenching temperature of steel, strengthen the refinement of steel section structure, and resist temper softening. Tungsten also has a significant effect ...

Claims

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Application Information

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IPC IPC(8): C22C38/54
Inventor 葛长胜
Owner JIANGSU JOSEN SPECIAL STEEL PRODS
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