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A heavy rail steel converter smelting method capable of reducing oxygen content during tapping

A technology of converter smelting and oxygen content, which is applied in the manufacture of converters, etc., can solve problems such as unfavorable temperature, stable control of steel material consumption, large dependence on experience operation, and influence on the stability of production process, so as to solve unstable factors and improve Effect of control level, improvement of service fatigue life and safety

Active Publication Date: 2021-07-27
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual operation, since the change of the gun position needs to be changed in combination with conditions such as furnace conditions, slag conditions, molten pool temperature, and molten steel composition, and combined with oxygen supply intensity and pressure for blowing operations, it is highly dependent on experience and operation, which is not conducive to Stable control of indicators such as molten steel composition, temperature and steel material consumption, thus affecting the stability of the entire production process

Method used

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  • A heavy rail steel converter smelting method capable of reducing oxygen content during tapping
  • A heavy rail steel converter smelting method capable of reducing oxygen content during tapping
  • A heavy rail steel converter smelting method capable of reducing oxygen content during tapping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A heavy rail steel converter smelting method for reducing oxygen content of steel, the steps:

[0032] 1) In the initial stage of smelting, the oxygen gun is continuously blowing oxygen at 1.65m during this period, and the oxygen pressure is controlled at 0.8 MPa and oxygen flow at 3.0 nm. 3 / min · ton steel; lime is added in accordance with 30kg / ton steel; the first addition of lime is added when starting smelting, and its addition is not less than 60% of the total amount; the first lime is added after the end, Immediately, add a light burning dolomite according to 12kg / ton steel; when smelting to 180s, the remaining lime is added for the second time. After the remaining lime is added, the iron ore is added according to 10kg / ton steel;

[0033] 2) In the middle of the converter smelting, the end of the 750S is smelted. During this time, the oxygen gun is still maintained at 1.65m, and the oxygen pressure is controlled at 0.7 MPa, and the oxygen flow is 2.6 nm. 3 / m...

Embodiment 2～6

[0037] The implementation process except that the rest is the same as in Example 1, Table 1 shows the main process parameters of the embodiments and the finite oxygen, carbon content and steel temperature control levels.

[0038] Table 1 Main Process Parameters of Embodiments of the Invention

[0039]

[0040] Continued table 1

[0041]

[0042]

[0043] Examples 2 to 6 In the production method of the present invention, the temperature of the end point is controlled above 1630 ° C, and the phosphorus content is controlled at 0.015% or less, and the carbon content is 0.35 ~ 0.50%, the oxygen content is less than 120 ppm, and the amount of carbonaceous agent is used in 42.3. % ~ 52.9%, reducing the amount of deoxidation alloy is 11.7% to 15.8%, thereby reducing the number of internal oxide inclusions in steel, improving the level of steel clean and cleanness control level and the use of fatigue life and safety of rails.

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Abstract

A heavy rail steel converter smelting method that can reduce the oxygen content during tapping: the first 350s of converter smelting is the initial smelting period. Two batches are added; from the end of the initial period to 750s is the mid-smelting period, during which the oxygen lance position is still kept at 1.6-1.7m for continuous oxygen blowing, and lime and iron ore are added in sequence when the smelting reaches 450s; The end of the mid-term to 900s is the final stage of smelting. During this period, the position of the oxygen lance is still kept at 1.6-1.7m for continuous oxygen blowing, and lime and lightly burned dolomite are added in sequence. The present invention solves the unstable factors caused by the dynamic control of the lance position and empirical operation by keeping the oxygen lance position fixed; while ensuring effective dephosphorization, the oxygen content at the end of the converter blowing can be kept below 120PPm, thereby enabling Reduce the amount of carburizer by 40% to 60%, and reduce the amount of deoxidized alloy by 10% to 20%, thereby reducing the inclusion of endogenous oxides in the steel and improving the service life and safety of the rail.

Description

Technical field [0001] The present invention relates to a smelting method of steel type, especially in a smelting method of heavy rail steel converter; the present invention is a smelting process for the top-bottom pressure. Background technique [0002] In recent years, with the development of railway transportation, the fatigue of heavy rails has also put forward higher requirements, such as high strength, high resistance, and good anti-fatigue. Performance, etc. At present, high-carbon steel such as heavy rail steel is mostly used in converter, and the end point is about 0.08% to 0.15%, and the production method of rehydrogenation is added after deoxidation. Such methods are deoxidized and the amount of carbonated dosage is large, the alloy is high and produces a large amount of endogenic oxide inclusions. It is well known that rail fatigue properties and service life are closely related to steel clean, and the effective control of inclusions can significantly improve steel an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/35C21C5/36C21C7/064
CPCC21C5/35C21C5/36C21C7/0645
Inventor 郑建国周剑华陈光友朱敏费俊杰王瑞敏欧阳珉路赵国知
Owner 武汉钢铁有限公司
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