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Smelting method for rapidly heating refining furnace under low-alkalinity slag condition

A smelting method and refining furnace technology, which is applied in the field of smelting where the refining furnace heats up rapidly under the condition of low alkalinity slag, can solve the problem of difficulty in realizing multi-furnace continuous pouring and large-scale production, poor slag foaming effect, and inability to arc buried To achieve the effects of shortening the refining cycle, strong operability of the process, and reducing the heating pressure

Pending Publication Date: 2021-09-17
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the actual production process, when the LF furnace produces low-basic slag, due to the poor foaming effect of the slag, the arc cannot be effectively buried during the power transmission process, which makes it difficult to raise the temperature in the refining process, and the refining cycle is long, and it is difficult to realize multi-furnace continuous pouring and mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Production of non-quenched and tempered steel C with S content in the range of 0.060-0.070% 7 0S 6 .

[0036] 1) Molten steel enters the station, and the temperature is measured at 1524°C.

[0037] 2) Add 800kg of lime, 150kg of quartz sand, and stir for 1 minute with a large argon flow rate of 750L / min, and the slag melts well.

[0038] 3) Adjust the argon gas flow rate to 90L / min, power transmission, adjust to gear 5, arc current 42000A, arc voltage 200V; add 120kg calcium carbide and 40kg carburant during power transmission.

[0039] 4) The arc is stable during the power transmission process, and the flue gas in the furnace is milky white, and no deoxidizer is added.

[0040] 5) Power off after 20 minutes of power transmission, take slag sample (1), temperature measurement: 1606°C, slag sample (1) main components: CaO: 43.16%, SiO 2 : 18.25%, Al 2 o 3 : 13.96%, MgO: 9.06%, FeO+MnO: 1.49%, R: 2.36.

[0041] 6) Add 500kg of quartz sand and continue to power on. ...

Embodiment 2

[0044] Production of non-quenched and tempered steel 36MnVS with S content in the range of 0.035-0.045% 4 .

[0045] 1) Molten steel enters the station, and the temperature is measured at 1531°C.

[0046] 2) Add 850kg of lime, 160kg of quartz sand, stir for 1 minute with a large argon flow, and the slag melts well.

[0047] 3) Adjust the argon gas flow rate to 90L / min, and then power on, adjust to gear 5, arc current 42000A, arc voltage 200V, add 150kg calcium carbide during power transmission.

[0048] 4) The arc is stable during the power transmission process, and the flue gas in the furnace is yellowish white, and 30kg of calcium carbide is added.

[0049] 5) After 19 minutes of power failure, the slag sample (1) was taken, and the temperature was measured: 1604°C. Slag sample (1) main components: CaO: 42.58%, SiO 2 : 16.35%, Al 2 o 3 : 12.57%, MgO: 9.86%, FeO+MnO: 1.64%, R: 2.60.

[0050] 6) Add 480kg of quartz sand and continue to power on. After 3 minutes, the pow...

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Abstract

The invention relates to a smelting method for rapidly heating a refining furnace under a low-alkalinity slag condition. When sulfur-containing non-quenched and tempered steel is produced, the adding amount of quartz sand is controlled in the earlier stage of LF furnace refining, namely the alkalinity of slag is controlled, a certain amount of carbonaceous deoxidizing agent is added for deoxidation, the foaming performance of the slag is improved, and therefore power transmission and temperature rising are carried out under the condition that the electrode submerged arc effect is good, the temperature of molten steel is raised to the outbound temperature range, and finally low-alkalinity slag adjustment is carried out. By means of the smelting method, the heating rate of the refining furnace is greatly increased, the heating rate of the refining furnace is increased by 30%-40%, the refining period is shortened by 10-15 minutes, and the actual use and popularization value is obvious.

Description

technical field [0001] The invention relates to the technical field of copper-iron smelting, in particular to a smelting method for rapidly raising the temperature of a refining furnace under the condition of low-alkalinity slag. Background technique [0002] At present, with the development of my country's industry, the demand for high-performance materials in various industries, especially special steel, has increased significantly. Among them, the development of automotive steel requires technological upgrading, structural adjustment, variety optimization, quality improvement, and product optimization. The non-quenched and tempered steel used in the expansion connecting rod of automobile engines is an important material used by many automobile manufacturers in Europe. Now the domestic supply of steel is basically realized in China. [0003] "Sulfur" element is considered as a harmful impurity in general special steel, and it is required to be controlled as low as possible...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06
CPCC21C7/0087C21C7/06
Inventor 刘敏廖广府韦泽洪徐利军
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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