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Smelting method for high-cleanliness chrome-molybdenum steel

A smelting method, chromium-molybdenum steel technology, applied in the field of metallurgy, can solve problems such as difficult removal of alumina inclusions, adverse effects on molten steel quality, and harsh conditions for electric furnace tapping, so as to reduce secondary oxidation, reduce refining power consumption, and reduce costs Effect

Active Publication Date: 2018-12-28
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a single manganese-based alloy and aluminum particle pre-deoxidation method is used in the tapping process, not only will the premature input of a strong aluminum-based deoxidizer under peroxidation conditions increase aluminum consumption, but it will also face difficulties such as large amounts of alumina inclusions that are difficult to remove. Detrimental effect on molten steel quality
In addition, the chromium-molybdenum steel with lower requirements for [P] content in the finished product requires more stringent electric furnace tapping conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The smelting method of the high-clean chromium-molybdenum steel 12Cr1MoVR of the present embodiment comprises electric furnace primary smelting, refining, and vacuum treatment processes, and the specific process steps are as follows:

[0018] (1) Initial electric furnace smelting process: After the electric furnace smelting is completed, C: 0.10%, P: 0.005%, the steel is tapped normally, and the molten steel is tapped into the red envelope of normal turnover. Calcium silicon alloy as deoxidizing material;

[0019] (2) Refining process: transfer the ladle to the refining position, add 0.3kg / t steel carbon powder and 1.5kg / t steel calcium carbide for pre-deoxidation, feed aluminum wire 1.8kg / t steel at one time after slag whitening, and add chromium-molybdenum The alloy is alloyed, the total retention time of white slag is 50min, and the slag is removed by hanging bag;

[0020] (3) Vacuum treatment process: After the VOD seat bag, first add 0.5kg / t of high-quality lime w...

Embodiment 2

[0023] The smelting method of the high-clean chromium-molybdenum steel 12Cr2Mo1R of the present embodiment comprises electric furnace primary smelting, refining, and vacuum treatment processes, and the specific process steps are as follows:

[0024] (1) Initial electric furnace smelting process: After the electric furnace smelting is completed, C: 0.09%, P: 0.005%, the steel is tapped normally, and the molten steel is tapped to the red envelope of normal turnover. Calcium silicon alloy as deoxidizing material;

[0025] (2) Refining process: transfer the ladle to the refining position, add 0.33kg / t steel carbon powder and 1.7kg / t steel calcium carbide for pre-deoxidation, feed aluminum wire 1.9kg / t steel at one time after slag whitening, and add chromium-molybdenum The alloy is alloyed, the total retention time of white slag is 52min, and the slag is removed by hanging bag;

[0026] (3) Vacuum treatment process: After the VOD seat bag, first add high-quality lime with a CaO co...

Embodiment 3

[0029] The smelting method of the high-clean chromium-molybdenum steel 12Cr2Mo1VR of the present embodiment comprises electric furnace initial smelting, refining, and vacuum treatment processes, and the specific process steps are as follows:

[0030] (1) Initial electric furnace smelting process: After the electric furnace smelting is completed, C: 0.08%, P: 0.004%, the steel is tapped normally, and the molten steel is tapped to the red envelope of normal turnover. Calcium silicon alloy as deoxidizing material;

[0031] (2) Refining process: transfer the ladle to the refining position, add 0.35kg / t steel carbon powder and 1.85kg / t steel calcium carbide for pre-deoxidation, feed aluminum wire 1.9kg / t steel at one time after slag whitening, and add chromium-molybdenum The alloy is alloyed, the total retention time of white slag is 53min, and the slag is removed by hanging bag;

[0032] (3) Vacuum treatment process: after the VOD seat, first add 1.1kg / t of high-quality lime with...

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Abstract

The invention discloses a smelting method for high-cleanliness chrome-molybdenum steel. The smelting method comprises the working procedures of electric furnace primary smelting, refining and vacuum treatment. As for the working procedure of refining, calcium carbide is used in refining, foaming slag can be quickly formed at a low temperature, the temperature increasing speed is increased, refining power consumption is lowered, gas suction of molten steel is reduced, and secondary oxidation of the molten steel is relieved; and after vacuuming is finished, a certain quantity of pure calcium lines are fed, the deep deoxidation effect can be enhanced, meanwhile, inclusions in the steel can be modified, and thus harm of the inclusions to the steel is lowered. The cleanliness of the chrome-molybdenum steel is improved through brand-new various novel steel smelting technologies such as earlier compositing weak deoxidation, later aluminum feeding deep deoxidation, prolonging of the vacuum maintenance time and soft blowing time, and calcium treatment after vacuuming, the content of O in the obtained molten steel can reach 10 ppm or below, in analysis on the inclusions in a finished steel product, the thickness of the A, B, C and D types of inclusions is smaller than or equal to 0.5 grade, uniformity of a steel plate structure is improved remarkably, the mechanical property of a steel plate is improved, and thus the smelting method has high application value.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for smelting high-clean chromium-molybdenum steel. Background technique [0002] Compared with the converter, the control of the carbon at the end point of the electric furnace is more difficult, and the overoxidation of the steel is more common. If a single manganese-based alloy and aluminum particle pre-deoxidation method is used in the tapping process, not only will the premature input of a strong aluminum-based deoxidizer under peroxidation conditions increase aluminum consumption, but it will also face difficulties such as large amounts of alumina inclusions that are difficult to remove. adversely affect the quality of molten steel. In addition, the chromium-molybdenum steel with lower requirements for the [P] content of the finished product has more stringent conditions for tapping the electric furnace. [0003] In recent years, with the increasing...

Claims

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Application Information

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IPC IPC(8): C21C5/52C21C7/10C21C7/06C21C7/00
CPCC21C5/52C21C7/0006C21C7/06C21C7/10Y02P10/20
Inventor 邓建军李杰李样兵吴艳阳牛红星袁锦程龙杰柳付芳尹卫江候敬超王东阳彭世宝赵向政刘德胜
Owner WUYANG IRON & STEEL
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