A method for smelting ultra-low carbon stainless steel in an intermediate frequency furnace

A technology of stainless steel and intermediate frequency furnaces, applied in furnaces, electric furnaces, furnace types, etc., can solve problems such as high temperature resistance, poor corrosion resistance, furnace piercing accidents, difficult decarburization, etc., achieve smooth surface, prevent furnace leakage, The effect of less burning loss

Active Publication Date: 2017-08-29
四川民盛特钢锻造有限公司
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Problems solved by technology

The carbon content of ultra-low carbon stainless steel ingots is less than 0.03%, and it is difficult to achieve decarburization by direct oxygen blowing during intermediate frequency smelting. In addition, the lining of intermediate frequency furnaces is thin, and improper oxygen blowing is prone to furnace accidents, and stainless steel that has only been smelted by intermediate frequency furnaces High temperature resistance and poor corrosion resistance are not suitable for special purposes and working environments such as nuclear power and thermal power production

Method used

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Embodiment

[0027] A method for smelting ultra-low carbon stainless steel in an intermediate frequency furnace, the specific steps of which are:

[0028] (1) Hot metal pretreatment: use a converter to carry out three-removal pretreatment on the hot metal, and control the sulfur content in the hot metal to ≤0.020%, the phosphorus content to ≤0.035%, and the silicon content to ≤1.00%;

[0029] (2) Intermediate frequency smelting: add ordinary steel scrap to the intermediate frequency furnace, smelt it into molten steel, and then add molten iron that has undergone three pretreatments;

[0030] (3) Oxygen blowing to reduce carbon: blowing oxygen into molten steel for carbon treatment, control carbon content ≤ 0.02%;

[0031] (4) Adding trace elements: through accurate calculation, add appropriate amount of carbon ferrochromium, ferronickel, and ferromolybdenum to molten steel, and control the content of chromium, nickel, and molybdenum in molten steel according to the type of stainless steel;...

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Abstract

The invention discloses a method for smelting ultra-low carbon stainless steel through an intermediate frequency furnace. The method comprises the specific steps of firstly, molten iron pretreatment; secondly, intermediate frequency smelting; thirdly, oxygen blowing and carbon reducing; fourthly, microelement adding; fifthly, deoxidation treatment; sixthly, casting shaping; and seventhly, electroslag remelting. An intermediate frequency furnace smelting manner and an electroslag remelting refining manner are adopted to produce the ultra-low carbon stainless steel, the production manner is flexible, and the material supply manner of small batches, multiple specifications and urgent demands of a customer can be met; the intermediate frequency furnace is high in smelting speed, good in power-saving effect, few in burning loss and low in energy consumption; the smelting efficiency is improved; and electroslag remelting refining is adopted to enable the inner structure of a steel ingot to be more compact, and the ultra-low carbon stainless steel is high in purity, low in sulfur containing, less in nonmetallic inclusion, smooth in surface, clean, even and compact and even in gold phase structure and chemical component.

Description

technical field [0001] The invention relates to the stainless steel smelting industry, in particular to a method for smelting ultra-low-carbon stainless steel with an intermediate frequency furnace. Background technique [0002] Ultra-low carbon steel refers to steel with a carbon content below 0.03%. Carbon is the traditional and most economical strengthening element. Carbon in steel increases the strength of steel through solid solution strengthening. However, with the increase of carbon content in the steel, the ductility and deep drawing performance of the rolled steel plate will be greatly reduced. With the development of industrial demand, the ultra-low carbon microalloying composition design system is adopted accordingly, which not only meets the requirements of steel strength performance, but also meets other requirements. [0003] The smelting of ultra-low carbon steel generally uses electric furnace or vacuum furnace for smelting. Such equipment is expensive and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52
CPCC21C5/52Y02P10/20
Inventor 余小明
Owner 四川民盛特钢锻造有限公司
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