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Complex deoxidization process for nitrogen containing diphasic stainless steel

A duplex stainless steel and composite deoxidation technology, which is applied in the field of corrosion-resistant cast steel, can solve problems such as difficulty in ensuring the corrosion resistance of materials, and achieve the effects of improving safety and reliability, reducing maintenance times, and excellent seawater corrosion resistance

Inactive Publication Date: 2008-12-03
LUOYANG SUNRUI SPECIAL EQUIP
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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

[0018] 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. A duplex stainless steel induction furnace is adopted to smelt the duplex stainless steel; in the beginning period of a reduction period, manganese iron (1.0 to 4.0kg / t (molten steel)) plus silicoferrite (2.0 to 5.0kg / t (molten steel)) is processed through pre-deoxidation; strong Si-Ca deoxidant (1.0 to 4.0kg / t (molten steel)) is added in the molten steel for secondary deoxidation in a few minutes before tapping; Si-Ca powders (0.5 to 3.0kg / t (molten steel)) are adopted for the diffusive deoxidation technology in a steel ladle. By adopting the compound deoxidation technology method, the oxygen content can be reduced to 0.012 to 0.018 percent; the obtained stainless steel has excellent marine corrosion resistance; in the NaCl solution of 3.5 percent, the corrosion velocity can reach 2.0 to 8.0*10g / 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, etc.

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 deoxid...

Claims

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Application Information

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IPC IPC(8): C21C7/06
Inventor 靳新峰吴智信陈继志
Owner LUOYANG SUNRUI SPECIAL EQUIP
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