Stainless-steel smelting method

A smelting method and stainless steel technology, applied in the field of steelmaking, can solve problems such as affecting product quality, large investment, environmental pollution, etc., and achieve the effect of easy control of alloy composition

Active Publication Date: 2013-10-16
BEIJING SHOUGANG INT ENG TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

When scrap steel or stainless scrap steel is used as raw material, some residual heavy metals in scrap steel cannot be removed, which affects the quality of the final product. When molten iron is used as raw material, production facilities such as blast furnaces are required, which requires large investment, resource consumption, and serious environmental pollution.

Method used

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  • Stainless-steel smelting method

Examples

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Embodiment Construction

[0018] 1) Use the eccentric bottom electric arc furnace 1 to melt direct reduced iron to smelt crude molten steel with low phosphorus content. The main components of direct reduced iron are: C 1.4%; S 0.01%; P 0.04%; total iron content 92%; metallic iron content 84.64% %; FeO 9.47%; tapping temperature 1560°C, P content 0.025%, and then tapping into ladle 2.

[0019] 2) Mix the crude molten steel in the ladle 2 into the tapping groove structure electric arc furnace 3. Its task is to melt high-carbon ferrochromium, stainless steel return material and a small amount of scrap steel. These raw materials plus the molten steel provided by the eccentric furnace bottom electric arc furnace 1 are After smelting, the steel is tapped by mixing steel slag (for reducing chromium oxide in the slag), and the tapping temperature is 1660°C. After the slag is removed, the molten steel is blended into the AOD furnace 4 .

[0020] 3) The oxygen lance and the tuyeres on the side of the furnace bo...

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Abstract

The invention relates to a stainless-steel smelting method, belonging to the technical field of steel smelting. The process comprises the following steps: melting by using an ultrahigh-power electric-arc furnace with an eccentric bottom to reduce iron directly, wherein the electric-arc furnace is provided with a large-flow furnace wall cluster coal oxidation gun; alloying by using the electric-arc furnace in the steel tapping spout structure; refining by using an AOD furnace; refining by using a VOD furnace; and casting continuously. Each step of the stainless-steel smelting process has a definite target, and the equipment has a definite division of work, namely, the first electric furnace is used for melting to reduce iron directly and dephosphorize so as to provide the qualified crude molten steel, and the second electric furnace is used for alloying so as to provide the qualified mother liquid for the AOD furnace and finish the refining by the AOD furnace; the time rhythms are combined reasonably, thus the burden of the subsequent AOD furnace is reduced; more than 85% of alloy is added in the electric furnaces, thus the components of the alloy are easy to control; when the waste stainless steel resources are sufficient, the waste stainless steel can be smelted in the second electric furnace, and the mother liquid can be provided for the AOD furnace; and second electric furnace can be used for producing special steel according to the change of the market.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular provides a method for smelting stainless steel, which uses direct reduced iron as a raw material, and uses two electric furnaces for melting and alloying respectively. Background technique [0002] At present, the main raw materials for smelting stainless steel at home and abroad are mostly ordinary steel scrap, stainless steel scrap and molten iron. [0003] The smelting method of stainless steel scrap is mainly the two-step method of electric furnace-AOD furnace or the three-step method of electric furnace-AOD furnace-VOD furnace. When scrap steel or stainless steel scrap is used as raw material, some residual heavy metals in scrap steel cannot be removed, which affects the quality of the final product. When molten iron is used as raw material, production facilities such as blast furnaces are required, which requires large investment, resource consumption, and serious envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/12C21B13/14
Inventor 武国平张国栋张德国宋宇王庆周魏永义蒋治浩方颖
Owner BEIJING SHOUGANG INT ENG TECH
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