Complex deoxidization process for nitrogen containing diphasic stainless steel

A technology of duplex stainless steel and composite deoxidation, applied in the field of corrosion-resistant cast steel, to achieve the effect of reducing maintenance times, excellent seawater corrosion resistance, and reducing life-cycle costs

Inactive Publication Date: 2011-06-15
LUOYANG SUNRUI SPECIAL EQUIP
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AI Technical Summary

Problems solved by technology

A single deoxidation method is difficult to guarantee the corrosion resistance of the material

Method used

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Embodiment Construction

[0020] 2T induction furnace smelting, at the beginning of the reduction period, 2.0kg ferromanganese / t is used in the furnace 钢水 , 3.0kg ferrosilicon / t 钢水 Carry out initial deoxidation; 5 minutes before tapping, insert a block (particle size 10mm-20mm) Si-Ca deoxidizer into molten steel in the furnace to carry out precipitation deoxidation, and the addition amount is 1.5kg / t 钢水 ; Si-Ca powder is used in the ladle for diffusion deoxidation, and the addition amount is 1.0kg / t 钢水 . When using induction furnace to melt SS2377 nitrogen-containing duplex stainless steel, the oxygen content can be reduced to 0.015%. Seawater corrosion resistance can reach 4.0×10 -3 g / m 2 h.

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Abstract

The invention discloses a compound deoxidation technology method of a nitrogen-containing duplex stainless steel, including a melting process by adoption of a duplex stainless steel induction furnace. The invention is characterized by using a deoxidizer ferromanganese and ferrosillicon for primary deoxidation after digging up oxidizing slags and entering the beginning of the reduction period, using the deoxidizer Si-Ca for secondary deoxidation before tapping, using the deoxidizer Si-Ca powder for third deoxidation in a ladle. By adopting the compound deoxidation technology method, the oxygen content can be reduced to 0.012 to 0.018 %; the obtained stainless steel has excellent marine corrosion resistance; in the 3.5 % of NaCl solution, the corrosion velocity can reach 2.0 to 8.0*10<-3>g / m<2>h; the method has wide application prospect in the industries such as seawater, sewage water, paper making, stack gas desulfurization in an electric power plant and the like.

Description

technical field [0001] The invention relates to the technical field of corrosion-resistant cast steel, in particular to a compound deoxidation process method for nitrogen-containing duplex stainless steel. Background technique [0002] The multi-step composite deoxidation process is mainly aimed at the manufacturing process of nitrogen-containing duplex stainless steel castings. Nitrogen-containing duplex stainless steel castings are currently mostly used in pump and valve equipment such as seawater, sewage, papermaking, and flue gas desulfurization in power plants, and the materials are required to have excellent corrosion resistance. The main problems currently existing: [0003] When the induction furnace is used for smelting, the single deoxidation method is used, the deoxidation of the molten steel is not sufficient, the oxidation slag is easily formed inside the casting, and the corrosion resistance of the material cannot be guaranteed. [0004] At present, Al deoxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06
Inventor 靳新峰吴智信陈继志
Owner LUOYANG SUNRUI SPECIAL EQUIP
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