Converter steelmaking process

A converter steelmaking and refining period technology, applied in the direction of manufacturing converters, etc., can solve the problems of increased scheduling difficulty, low steelmaking efficiency, temperature loss, etc., to improve the use efficiency, improve the quality of steel grades, and reduce the temperature drop of molten iron. Effect

Inactive Publication Date: 2004-01-28
CENT IRON & STEEL RES INST
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AI Technical Summary

Problems solved by technology

For example, NKK Fukuyama Plant in Japan uses desulfurized molten iron to dephosphorize through a dedicated dephosphorization converter, and then re-blends it into another converter for decarburization and refining, which increases the difficulty of scheduling and also causes temperature loss.
As a result, steelmaking efficiency is low, energy consumption is high, and cost is high (Kobe Steel Technical Report. 38(1): 9; Iron and Steel, 1990, (11): 1817)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] According to the converter steelmaking method of the present invention, 3 heats of steel are smelted on a 90-ton converter, and the raw materials are blast furnace molten iron and steel scrap. The ratio of molten iron and steel scrap, as well as the composition and temperature of molten iron are shown in Table 1. After the molten iron is mixed into the converter, the three-removal pretreatment is carried out first, and the top-bottom composite blowing is started, and the dephosphorization agent is added at the same time. The amount of the dephosphorization agent and the chemical composition of the dephosphorization agent are shown in Table 2. After the pretreatment, the furnace is turned over to discharge slag, and 1 / 2-2 / 3 of the primary slag is poured out, and then lime is added for decarburization and refining. The top-bottom combined blowing system and lime addition amount during the pretreatment period and decarburization refining are listed in Table 3. After the d...

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Abstract

The convertor steel-smelting method adopts the top and bottom combined converting process, uses molten iron and solid iron material as raw material, their weight percentage are, molten iron 85%-95% and solid iron material 5-15%. The pretreatment of desilication, dephosphorization and decarbonization of molten iron and decarbonizing refining process are implemented in same convertor, i.e. front stage is pretreatment of molten iron, and late stage is decarbonizing refining stage, in the pretreatment stage the dephosphorization agent can be added, the top-bottom combined converting process can be adopted, top converting adopts flow rate changed oxygen supply, and its medium and late stage adopts weak oxygen supply, and the decarbonizing refining stage adds lime, makes secondary slag formation and adopts large quantity of oxygen to make top and bottom combined converting process.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and relates to a converter steelmaking production process. It is suitable for various converters for desiliconization, dephosphorization and decarburization of molten iron, three de-pretreatment and decarburization refining. Background technique [0002] Phosphorus is a harmful impurity in steel, which is easy to segregate at the grain boundary, causing the steel to be "cold and brittle", and significantly reducing the low temperature impact toughness of the steel. Generally, with the increase of carbon, nitrogen and oxygen content in steel, this harmful effect of phosphorus is enhanced. In addition, the segregation degree of phosphorus in the slab is very large, which highlights its harmful effect. With the improvement of users' requirements for steel quality, the requirements for phosphorus content in steel are becoming more and more stringent, and it is required to reduce the phospho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28
Inventor 刘浏佟溥翘金振坚郑丛杰曾加庆高建军布焕存胡砚斌米谷明
Owner CENT IRON & STEEL RES INST
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