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Method for producing stainless steels

A technology of casting steel and containers, which is applied in the field of special steel manufacturing, can solve problems such as high energy consumption and temperature loss, and achieve the effect of saving process steps

Inactive Publication Date: 2005-10-12
SMS DEMAG AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this, high energy must be consumed and temperature losses are unavoidable

Method used

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  • Method for producing stainless steels
  • Method for producing stainless steels

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Embodiment Construction

[0023] Figure 1 shows an embodiment of the invention of a smelting plant comprising two process vessels. The smelting plant 1 consists of two process vessels 2, 3, which are operated alternately as an electric arc furnace step (1) and an oxygen blowing step (11). In the treatment vessel 2 on the left, the operating state of melting by means of an electric arc is shown; in the treatment vessel 3 on the right, the operating state of oxidation or oxygen blowing to reduce the carbon content of the melt is shown.

[0024] For blowing in oxygen, the spray gun 4 is fixed on a spray gun support arm 5, and the spray gun is passed coaxially with the main shaft of the container through a waste gas elbow 6 and the lid center hole 7 of a turning cover 8 of the treatment container 3 on the right into the upper part 9 of the container internal. The opening 10 of the exhaust gas elbow 6 rests against the cover core hole 7 of the cover 8 . The upper part 9 and the lower part 11 form the lowe...

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Abstract

The invention relates to a method for producing stainless steels, in particular steels containing chromium and chromium-nickel. The method is carried out in a melting device containing a metallurgical vessel, or in a melting device ( 1 ) containing at least two vessels ( 2, 3 ) for supplying a steel-casting installation, an electric arc furnace process ( 1 ) and an air-refining process taking place alternately in the two vessels ( 2, 3 ). To improve the efficiency of a method of this type, the aim of the invention is to carry out a reversible treatment of unreduced converter slag in the electric-arc furnace mode. To achieve this, in the first treatment stage, the slag ( 19 ) with a high chromium content is melted together with the added charge, the slag is then reduced during the melting process with the silicon and carbon under favorable thermodynamic conditions of the arc, once the slag has reached a minimum temperature of 1,490° C. and the slag is subsequently removed. The air-refining process is then carried out, during which the carbon content is reduced to a value of less than 0.9%. The metal slag ( 18 ) is tapped at a tapping temperature of between 1,620 and 1,720° C., the unreduced slag ( 19 ) with a high chromium content from the air-refining process remaining in the treatment vessel.

Description

technical field [0001] The invention relates to a method for manufacturing stainless steel, in particular to a method for manufacturing special steel containing chromium or chromium-nickel. Background technique [0002] For the production of chromium- or chromium-nickel-containing special steels, several multi-step processes carried out in smelting plants comprising at least two vessels have been disclosed. According to the corresponding process, decarburization is carried out until the carbon content is below 0.3%. For this, high energy must be consumed and temperature losses are unavoidable. [0003] DE 196 21 143 discloses a method. The method is carried out in a smelting plant comprising at least two vessels. Two vessels are operated in parallel, where each vessel can be used in turn as an electrode for melting the charge or as a lance for top blowing and / or blowing oxygen and oxygen mixture. These vessels are used first as smelting equipment and then as oxidation eq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00C21C5/00C21C5/52C21C7/068F27B3/04F27B3/22
CPCC21C5/005C21C5/5252C21C5/5264C21C7/0685C21C7/068
Inventor K·R·戈特青格S·莱姆克J·赖歇尔B·罗林格尔
Owner SMS DEMAG AG