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Method and device for producing pig-iron based stainless steel without using a supply of electrical energy

A technology for supplying electric energy and stainless steel, which is applied in the field of manufacturing stainless steel, can solve problems such as lack of energy, and achieve the effects of reducing investment costs, reducing process costs, and reliable temperature control

Inactive Publication Date: 2009-09-23
SMS DEMAG AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disclosed method has the disadvantage that in the end only ferritic steels can be produced with this method due to the lack of energy.

Method used

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  • Method and device for producing pig-iron based stainless steel without using a supply of electrical energy
  • Method and device for producing pig-iron based stainless steel without using a supply of electrical energy

Examples

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Embodiment Construction

[0021] figure 1 A schematic diagram of an exemplary process line for manufacturing stainless steel is shown. The liquid pig iron quantity is divided after it has flowed out of the blast furnace 1 and charged into two twin AOD-L converters 2 , 3 arranged in parallel downstream of the blast furnace 1 . The DDD treatment and quenching and tempering and alloying of liquid pig iron are carried out here in the reverse sequence of the process steps. After treatment in the twin AOD-L converters 2, 3, the molten steel from the two twin AOD-L converters 2, 3 joins in the ladle 4 and flows from there for final matching / adjustment into the ladle furnace 5 and from there to the continuous casting machine 6 .

[0022] figure 2 The reverse flow of the process steps carried out in the duplex AOD-L converters 2 and 3 is shown. In the twin AOD-L converter 2 (on the left in the figure) DDD-treatment V7 is started, followed by charging and heating V8 by means of FeSi, and then AOD-treatment ...

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Abstract

The aim of the invention is to produce stainless steel for all stainless steel products both in the austenitic and the ferritic range, based on liquid pig-iron and FeCr solids, without using a supply of electrical energy. According to the invention, the liquid pig-iron, after being pre-treated in a blast furnace (1), is subjected to a DDD treatment (dephosphorisation, desiliconisation and desulphuration), is heated, finished or alloyed and deoxidated. The quantity of slag-free liquid pig-iron that has been pre-treated in the blast furnace (1) is separated and introduced into two classic 'twin' AOD-L converters (2, 3), where the required chemical process steps (of the DDD treatment and of the heating, decarburisation and alloying stages) take place in parallel contrary processes using autogenous chemical energy, the DDD treatment being carried out first in the first twin AOD-L converter (2) and the decarburisation being carried out first in the second twin AOD-L converter (3).

Description

technical field [0001] The invention relates to a method and a device for producing stainless steel on the basis of liquid pig iron and FeCr-solids without supplying electrical energy, wherein the liquid pig iron is pretreated in a blast furnace and DDD-treated (Dephosphorization, desiliconization, desulfurization) are then heated, tempered or alloyed and reduced in an AOD converter, and finally the treated molten steel is adjusted / conditioned in a ladle furnace. Background technique [0002] The use of AOD (Argon Oxygen Decarburization) converters for the production of special steels has been disclosed. WO 02 / 075003 therefore describes a computer-based and dynamic model-based control method based on continuous exhaust gas measurement, by means of which control method the necessary blowing rates (Blasrate) of oxygen and inert gas and additional materials are controlled . [0003] From EP 1 310 573 A2 a method is known for producing molten metal, in particular for refining ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12C5/00C21C7/06C21C7/068
CPCC21C7/0685C21C5/005C21C7/06C21C2300/08C21C7/00C21C7/068
Inventor J·赖彻尔
Owner SMS DEMAG AG