Production method of ultralow-oxygen titanium-containing ferrite stainless steel

A production method, ultra-low oxygen technology, applied in the field of stainless steel smelting, can solve problems such as insufficient consideration, and achieve the effects of inhibiting magnesia-aluminum spinel, low oxygen content, and simple operation

Active Publication Date: 2011-09-28
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Production method of ultralow-oxygen titanium-containing ferrite stainless steel
  • Production method of ultralow-oxygen titanium-containing ferrite stainless steel
  • Production method of ultralow-oxygen titanium-containing ferrite stainless steel

Examples

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Embodiment 1

[0056] Requirements for VOD of the refining equipment in this embodiment: the equipment can handle 120t of molten steel, the ultimate vacuum is less than 100Pa, and the total blowing capacity of argon blowing at the bottom is higher than 60Nm 3 / h, the ladle refractory material is magnesium calcium brick. The type of steel is 430L, the amount of molten steel is 104000kg, and the initial composition of molten steel before VOD smelting is:

[0057] C: 0.4%, Si: 0.17%, Cr: 16.4%, S: 0.005%, N: 0.017%, Mn: 0.56%, P: 0.015%, all O: 0.02%, Ti: 0.01%, Al: 0.001% , and the rest are Fe and trace impurity elements.

[0058] Initial temperature: 1600°C.

[0059] The implementation steps of this embodiment are as follows (see figure 2 ):

[0060] (1) The molten steel has undergone vacuum oxygen blowing decarburization and free decarburization treatment, and the total oxygen blowing volume is 1350Nm 3 After the treatment, the main components of molten steel are:

[0061] C: 0.009%, ...

Embodiment 2

[0083] Requirements for VOD of the refining equipment in this embodiment: the equipment can handle 120t of molten steel, the ultimate vacuum is less than 100Pa, and the total blowing capacity of argon blowing at the bottom is higher than 60Nm 3 / h, the ladle refractory material is magnesium calcium brick. The type of steel is 439, the amount of molten steel is 110,000kg, and the initial composition of molten steel before VOD smelting is:

[0084] C: 0.35%, Si: 0.04%, Cr: 17.6%, S: 0.005%, N: 0.011%, Mn: 0.22%, P: 0.013%, all O: 0.02%, Ti: 0.01%, Al: 0.001% , and the rest are Fe and trace impurity elements.

[0085] Initial temperature: 1600°C.

[0086] The implementation steps of this embodiment are as follows:

[0087] (1) The molten steel has undergone vacuum oxygen blowing decarburization and free decarburization treatment, and the total oxygen blowing volume is 1094Nm 3 After the treatment, the main components of molten steel are:

[0088] C: 0.005%, Si: 0.01%, Cr: 16...

Embodiment 3

[0111] Requirements for VOD of the refining equipment in this embodiment: the equipment can handle 120t of molten steel, the ultimate vacuum is less than 100Pa, and the total blowing capacity of argon blowing at the bottom is higher than 60Nm 3 / h, the ladle refractory material is magnesia carbon brick. The steel type is 409L, the amount of molten steel is 107000kg, and the initial composition of the molten steel before VOD smelting is:

[0112] C: 0.26%, Si: 0.15%, Cr: 11.5%, S: 0.004%, N: 0.013%, Mn: 0.3%, P: 0.013%, all O: 0.025%, Ti: 0.02%, Al: 0.001% , and the rest are Fe and trace impurity elements.

[0113] Initial temperature: 1620°C.

[0114] The implementation steps of this embodiment are as follows:

[0115] (1) The molten steel has undergone vacuum oxygen blowing decarburization and free decarburization treatment, and the total oxygen blowing volume is 938Nm 3 After the treatment, the main components of molten steel are:

[0116] C: 0.006%, Si: 0.01%, Cr: 10.8...

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Abstract

The invention discloses a production method of ultralow-oxygen titanium-containing ferrite stainless steel, which comprises the following steps: 1) preparing molten ferrite stainless steel under a vacuum condition in a vacuum oxygen blowing decarburization furnace, wherein the carbon mass percentage content and nitrogen mass percentage content in the molten ferrite stainless steel are both less than 0.01 percent; 2) performing deoxidization, namely adding 6 to 12 kilograms of aluminum block or grains into each ton of steel and adding 10 to 28 kilograms of active lime into each ton of steel; 3) alloying silicon and aluminum, namely adding 2 to 9 kilograms of silicoferrite which contains 70 to 80 percent of silicon into each ton of steel and adding 0 to 1 kilogram of aluminum blocks or grains into each ton of steel, wherein the aluminum content is 0.02 to 0.1 percent; 4) performing desulphurization; (5) breaking vacuum; 6) softly stirring; 7) feeding titanium wires; 8) feeding silicon and calcium wires, wherein the calcium content is 5 to 30ppm; 9) softly stirring; and 10) continuously casting. The method can be used for producing ultralow-oxygen titanium-containing ferrite stainless steel, prevent or inhibit forming magnesia alumina spinel which are harmful impurities in a production process, improve product quality, prevent the water gap of tundish from being blocked in a continuous casting process and guarantee smooth production.

Description

technical field [0001] The invention relates to the field of stainless steel smelting, in particular to a production method of ultra-low oxygen titanium-containing ferritic stainless steel. Background technique [0002] At present, ferritic stainless steel, which is less dependent on nickel resources, has been paid more and more attention by the society. The interstitial elements carbon and nitrogen in ferritic stainless steel seriously affect its performance, mainly room temperature brittleness, corrosion resistance and weld extension sex. For ferritic stainless steel, the purity of molten steel also affects the performance of steel. High purity can prolong the service life of stainless steel and improve the surface quality of products. The purity of molten steel is mainly characterized by the content of total oxygen and sulfur , the total oxygen content represents the sum of the dissolved oxygen content in the steel and the oxygen content in the inclusions in the molten s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06C21C7/064C21C7/10B22D1/00
Inventor 徐迎铁陈兆平
Owner BAOSHAN IRON & STEEL CO LTD
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