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Austenitic stainless steel smelted through laterite-nickle ore and production process of austenitic stainless steel

A technology for austenitic stainless steel and laterite nickel ore, which is applied in the field of stainless steel smelting technology, can solve the problems of long time for product formation, large equipment investment, and many production processes, so as to improve internal quality, reduce intermediate processes, and increase molten steel loading capacity. Effect

Inactive Publication Date: 2017-09-05
GUANGDONG GUANGQING METAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the purposes of the present invention is to address the above-mentioned deficiencies, to provide a kind of austenitic stainless steel smelted by laterite nickel ore and its production process, in order to solve the problem of high production cost of austenitic stainless steel in the prior art, large equipment investment, production process Many technical problems such as long time to produce products and low production capacity

Method used

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  • Austenitic stainless steel smelted through laterite-nickle ore and production process of austenitic stainless steel

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Effect test

Embodiment 1

[0033] This embodiment provides a kind of smelting austenitic stainless steel by using laterite nickel ore, and its chemical composition weight percentage ratio is: C: 0.042%, Si: 0.49%, Mn: 1.02%, Cr: 18.07%, Ni: 8.03% , N: 0.044%, Cu: 0.02%, P: 0.0287%, S: 0.0026%, O: 0.0042%, Ti: 0.008%, Mo: 0.025%, the rest are Fe and unavoidable impurity elements; Dg value = 6.98 .

[0034] The production process of the above-mentioned austenitic stainless steel is as follows:

[0035] Now take the production of austenitic stainless steel in φ5×40m drying kiln, φ4.4×100m rotary kiln, 33000KVA submerged arc furnace, 75tAOD furnace, LF ladle refining furnace, and a first-class 200*1600mm slab continuous casting machine as an example. Describe the production technique of the present invention:

[0036] (1) Match laterite nickel ore with different grades so that Ni in laterite nickel ore is 1.3~1.6%, Fe is 20.0~26.0%, P<0.01%;

[0037] (2) Use dry kiln coal powder as fuel to reduce the wat...

Embodiment 2

[0066] This embodiment provides a kind of smelting austenitic stainless steel by using laterite nickel ore, and its chemical composition weight percentage ratio is: C: 0.040%, Si: 0.54%, Mn: 1.05%, Cr: 18.12%, Ni: 8.04% , N: 0.046%, Cu: 0.04%, P: 0.0264%, S: 0.0039%, O: 0.0037%, Ti: 0.007%, Mo: 0.024%, the rest are Fe and unavoidable impurity elements; Dg value = 7.38 .

[0067] The production process of the austenitic stainless steel in the present embodiment is as follows:

[0068] Now take the production of austenitic stainless steel in φ5×40m drying kiln, φ4.4×100m rotary kiln, 33000KVA submerged arc furnace, 75tAOD furnace, LF ladle refining furnace, and a first-class 200*1600mm slab continuous casting machine as an example. Describe the production technique of the present invention:

[0069] (1) With different grades of lateritic nickel ore, Ni is 1.3~1.6%, Fe is 20.0~26.0%, P<0.01%;

[0070] (2) Dry kiln coal powder as fuel to reduce the water content of laterite ore...

Embodiment 3

[0100]This embodiment provides a kind of smelting austenitic stainless steel by using laterite nickel ore, and its chemical composition weight percentage ratio is: C: 0.039%, Si: 0.43%, Mn: 1.06%, Cr: 18.16%, Ni: 8.07% , N: 0.047%, Cu: 0.04%, P: 0.0291%, S: 0.0051%, O: 0.0045%, Ti: 0.006%, Mo: 0.023%, the rest are Fe and unavoidable impurity elements; Dg value = 6.85 .

[0101] The production process of the austenitic stainless steel in the present embodiment is as follows:

[0102] Now take the production of austenitic stainless steel in φ5×40m drying kiln, φ4.4×100m rotary kiln, 33000KVA submerged arc furnace, 75tAOD furnace, LF ladle refining furnace, and a first-class 200*1600mm slab continuous casting machine as an example. Describe the production technique of the present invention:

[0103] (1) With different grades of lateritic nickel ore, Ni is 1.3~1.6%, Fe is 20.0~26.0%, P<0.01%;

[0104] (2) Dry kiln coal powder as fuel to reduce the water content of laterite ore ...

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Abstract

The invention discloses austenitic stainless steel smelted through laterite-nickle ore and a production process of the austenitic stainless steel and belongs to a stainless steel smelting process. The stainless steel comprises, by mass percent, 0.030%-0.060% of C, 0.35%-0.60% of Si, 1.0%-1.3% of Mn, 18.00%-18.50% of Cr, 8.00%-8.10% of Ni, 0.025%-0.050% of N, 0%-0.5% of Cu, 0%-0.045% of P, 0%-0.0060% of S, 0%-0.0050% of O and the like. A homogenizing process is adopted, SiO2 / MgO and the like and slag composition operation of other process parameters are introduced for a first time, a stable slag melting temperature and electrical conductivity are achieved, and the energy consumption is greatly reduced. Laterite-nickel ore is subjected to double smelting of a rotary kiln, a submerged arc furnace and AOD, compared with traditional smelting, two middle working procedures of nickel and molten iron coasting and electric furnace remelting are reduced, the equipment and labor investment is reduced, the environment pollution caused by a storage area can be avoided, the process procedures are greatly shortened, the material forming time is shortened, and the stainless steel capacity is improved.

Description

technical field [0001] The invention relates to a stainless steel smelting process, more specifically, the invention mainly relates to an austenitic stainless steel smelted by laterite nickel ore and a production process thereof. Background technique [0002] Austenitic stainless steel has been produced for a long time, but the traditional stainless steel production method is to cast the thick nickel-iron alloy produced by the submerged arc furnace into nickel-iron nuggets, and then melt the nickel-iron nuggets in the electric arc furnace as the main raw material for smelting stainless steel. High chromium, slagging agent, return material and other raw materials are proportioned according to a certain ratio, and after decarburization, desulfurization and deoxidation, etc., the final refining is carried out, and the molten steel with AOD smelting composition and temperature is tapped and sent to the LF ladle refining furnace for composition and temperature adjustment, and f...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/50C22C38/44C22C33/04C21C7/068C21C7/072C21C7/00
CPCC22C38/02C21C7/0056C21C7/0685C21C7/072C22C33/04C22C38/001C22C38/04C22C38/42C22C38/44C22C38/50
Inventor 田伟光徐佳林刘光勇尹帮伍范孝亮王英
Owner GUANGDONG GUANGQING METAL TECH
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