Method for double alloying and nanophase modification of steel by atomic nitrogen

Inactive Publication Date: 2015-12-31
OTKRYTOE AKTSIONERNOE OBSHCHESTVO NOVOKUZNETSKIJ METALLURGICHESKIJ KOMB
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Problems solved by technology

However, the technology of steel alloying with nitrogen containing ferroalloys and purging a liquid phase of steel with nitrogen gas has significant...

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Production of Steel for Construction Industry

[0024]A purpose of using the new technology of alloying and modifying steel for construction industry is to increase the strength, ductility and cold-resistance of steel in order to reduce a metal content (weight) of building structures by 20-25% and guaranteed operation under climatic conditions up to −65° C. In steel industry, in the production of steel for construction industry, there is a task of ensuring decrease of production costs (prime cost) by saving up to 50-60% of expensive alloying elements without compromising GOST standards related to the strength of steel.

[0025]Currently for production of building structures manufacturers widely use manganese steel, for example, of the 14G2 grade containing weight percentages of: 0.12-0.18 C; 1.2-1.6 Mn; 0.17-0.37 Si; as well as steel of the 09G2S grade containing weight percentages of: ≦0.12 C, 0.5-0.8 Cu, 1.3-1.7 Mn. A disadvantage of said steel is a high content of Mn, increased product...

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Abstract

A new technology of intense double alloying and modification involves introduction, during the process of secondary treatment of steel, of nitrogen-containing substance in urea (NH2)2CO into a ladle with a steel melt, which at a temperature of the steel liquid phase of approximately 1650° C. dissociates in an explosive manner, releasing atomic nitrogen. Conversion or transformation of an explosive dissociation of urea into an intensive process of self-propagating synthesis of nitride nanophases is carried out using differentiated by the amount and time schemes of the input of urea into steel melt, wherein the basic parameters, depending on the type of steel, are the flow rate of urea per tonne of steel in the range of 0.4-1.8 kg/tonne and speed of its input into the melt in the range of 5.0-8.0 kg per minute.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International application no. PCT / RU2013 / 000190, filed on Mar. 13, 2013, the content of which is hereby incorporated herein by reference in its entirety.BACKGROUND[0002]1. Field of the Disclosure[0003]The present invention relates to ferrous metallurgy, namely, to the alloying and modification of steel with atomic nitrogen, which in contrast to molecular nitrogen, possesses unique physico-chemical properties, a very high chemical potential and highest energy potential, under influence of which the nature of the steel alloying and modification changes and causes fundamental physical qualities of steel.[0004]2. Description of the Related Art[0005]An object of the present invention relates to the ferrous metallurgy, namely, to secondary steel treatment, which is smelted in any steel melting unit and transformed into a casting ladle, where further technological operations related to deoxidation, alloying,...

Claims

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Application Information

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IPC IPC(8): C22C33/00C22C38/06C22C33/04C22C38/02C22C38/00C22C38/42C22C38/04
CPCC21C7/0075B82Y30/00C22C38/02C22C38/06C22C38/04C22C38/16C22C38/001C22C33/04C22C33/006C22C38/42C22C38/08C22C38/002C21C7/00
Inventor PARSHIN, VLADIMIR ANDREEVICHGOROKHOV, YURY LEONIDOVICH
Owner OTKRYTOE AKTSIONERNOE OBSHCHESTVO NOVOKUZNETSKIJ METALLURGICHESKIJ KOMB
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