Nickel-containing ferrite stainless steel smelted through laterite nickel ore and preparation method thereof

A technology of laterite nickel ore and stainless steel, applied in the field of iron and steel metallurgy, can solve problems such as adverse effects, and achieve the effect of reducing intergranular corrosion and pitting corrosion

Active Publication Date: 2019-12-20
王萍 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the viewpoint of the International Nickel Institute, reducing the use of nickel in stainless steel is a process choice in consideration of cost and price. There is no data showing the adverse effects of nickel on the structure and performance of stainless steel.

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0039] A method for preparing the nickel-containing ferritic stainless steel, the preparation method specifically includes the following steps:

[0040] S1. The raw material is the surface ore of low-nickel laterite nickel ore, which is smelted into molten iron by blast furnace or submerged thermal electric furnace, and then sent to AOD for blowing; During the smelting process, according to the Cr composition requirements of the nickel-containing ferritic stainless steel, the adjustment of the lower limit target of the Cr composition is completed, and the adjustment of the lower limit target of the main alloy elements Ni, Mn, and Si is completed;

[0041] S2. Transfer the molten steel from AOD blowing in S1 to the LF furnace, and make the C content and P content of the molten steel entering the LF furnace below the lower limit of the final composition, so as to prevent the increase of C in the later stage and leave room for the increase of C and P in the later operation ;

[...

Embodiment 1

[0053] The basic composition of a medium chromium nickel-containing ferritic stainless steel smelted from laterite nickel ore is calculated by mass percentage: C0.01-0.07%, Si≤0.8%, Mn≤0.8%, Cr 16%, Ni≤1.6%, P≤0.05%, S≤0.030%, Al0.01-0.05%, all O≤40ppm, and the rest are Fe and unavoidable impurities.

[0054] Wherein, the metallographic structure of the medium-chromium nickel-containing ferritic stainless steel is: a small amount of nano-scale carbides are evenly distributed on the ferrite matrix, the average size of the carbides is controlled below 400 nanometers, and the average grain size is less than 8 microns; Yield strength σ 0.2 ≥350MPa, breaking strength ≥450MPa, elongation ≥20%.

[0055] Wherein, the neutral salt spray corrosion resistance of the medium chromium-containing nickel-containing ferritic stainless steel is equal to or better than that of the austenitic stainless steel 304 stainless steel, and is close to that of the ferritic stainless steel 430.

[0056]...

Embodiment 2

[0068] The basic composition of a high-chromium nickel-containing ferritic stainless steel smelted from laterite nickel ore is calculated by mass percentage: C0.01-0.07%, Si≤0.8%, Mn≤0.8%, Cr 24%, Ni≤1.6%, P ≤0.05%, S≤0.030%, Al0.01-0.05%, total O≤40ppm, the rest is Fe and unavoidable impurities.

[0069] Wherein, the metallographic structure of the high-chromium-nickel-containing ferritic stainless steel is: a small amount of nano-scale carbides are evenly distributed on the ferrite matrix, the average size of the carbides is controlled below 400 nanometers, and the average grain size is less than 8 microns; Yield strength σ 0.2 ≥350MPa, breaking strength ≥450MPa, elongation ≥20%.

[0070] Wherein, the neutral salt spray corrosion resistance of the high-chromium nickel-containing ferritic stainless steel is equal to or better than that of 316 stainless steel.

[0071] Wherein, the preparation method of the high-chromium nickel-containing ferritic stainless steel comprises t...

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Abstract

The invention provides nickel-containing ferrite stainless steel smelted through laterite nickel ore and a preparation method thereof and belongs to the field of ferrous metallurgy. Basic components comprise 0.01-0.07 wt% of C, smaller than or equal to 0.8 wt% of Si, smaller than or equal to 0.8 wt% of Mn, 14-26 wt% of Cr, smaller than or equal to 1.6 wt% of Ni, smaller than or equal to 0.05 wt% of P, smaller than or equal to 0.030 wt% of S, 0.01-0.05 wt% of Al, smaller than or equal to 40 ppm of full O, and the balance Fe and inevitable impurity. The steel is based on the chromium-containingcharacteristic and the low-nickel characteristic of laterite nickel ore surface layer ore, effective components of resources are utilized for creating multiple kinds of nickel-containing ferrite stainless steel. The laterite nickel ore surface layer ore nearly abandoned is recycled and has value, according to the nickel-containing ferrite stainless steel, component adjustment and technology selection are carried out according to the needs of neutral salt mist corrosion resistance and pitting corrosion resistance, thus the functionality needs of multiple kinds of stainless steel can be met, andindustrialized production and use are benefitted.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a nickel-containing ferritic stainless steel smelted from laterite nickel ore and a preparation method thereof. Background technique [0002] The reserves of laterite nickel ore resources on the earth are as many as several hundred billion tons, and they are geologically stratified in layers ranging from a few meters to tens of meters deep on the earth's surface according to the nickel content. Among them, the middle ore contains high nickel, which can reach more than 1.0%, and has the value of smelting nickel metal, and generally becomes the raw material of 300 series stainless steel. [0003] Lateritic nickel ore, a natural alloy ore with high iron content, is a huge resource. Although lateritic nickel ore has a high iron content in the surface layer, including valuable alloys such as chromium, nickel, and cobalt, the metal content can reach more than 55%, but because ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/18C22C38/40C22C38/04C22C38/02C22C33/04C21C7/06C21C7/064C21C7/072C21C7/076
CPCC22C38/06C22C38/18C22C38/40C22C38/04C22C38/02C22C33/04C21C7/06C21C7/064C21C7/072C21C7/076Y02P10/20
Inventor 王平赵永璞
Owner 王萍
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