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A smelting method for reducing iron oxide scale on the surface of slab

A technology of surface oxidation and smelting method, applied in the field of metallurgy, can solve the problems of not achieving normal cooling effect, increasing the production of iron oxide scale, high temperature of secondary cooling water, reducing the thickness of iron oxide scale, improving cooling uniformity, reducing The effect of clogged nozzles

Active Publication Date: 2022-04-19
NANJING IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The temperature of the secondary cooling water is too high, which cannot achieve the normal cooling effect, and the surface temperature of the slab is high, resulting in a high surface temperature of the slab, which increases the amount of oxide scale

Method used

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  • A smelting method for reducing iron oxide scale on the surface of slab

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Embodiment 1

[0032] Aiming at the problem that the oxide scale on the surface of the slab is relatively thick (the average thickness of the surface oxide scale of the original peritectic alloy steel slab reaches 1.50-1.63mm), the method of the present invention is applied to carry out the oxide scale on the surface of the slab by dividing the casting machine and the steel type. Actual measurement evaluation. Increase the specific water volume of the secondary cooling from 0.60L / Kg to 0.70L / Kg, control the surface temperature of the slab at 8°C-30°C, and the temperature of the secondary cooling water ≤ 30°C, compare and evaluate the thickness of the oxide scale on the surface of the slab, and the average thickness is from 1.45mm is reduced to 0.65mm, the specific test process data are shown in Table 1:

[0033] Table 1: Thickness of oxidized iron scale on the surface of slab before and after secondary cooling process test (unit: mm)

[0034]

[0035] Table 2: Secondary cooling process t...

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Abstract

The invention discloses a smelting method for reducing oxide scale on the surface of a slab. By adjusting and optimizing the continuous casting secondary cooling process, the continuous casting secondary cooling intensity is increased from 0.60 L / Kg to 0.70 L / Kg, and the casting machine is controlled. The fluctuation range of the proportion of cooling water in each zone from the upper part to the lower part improves the cooling uniformity of the slab in the casting direction, and achieves a good secondary cooling water spray atomization effect by reducing nozzle clogging. The thickness of the oxide scale on the surface of the slab is significantly reduced, and the average thickness is reduced from 1.45mm To 0.65mm, the recovery rate of continuous casting molten steel is improved, and the economic benefit is remarkable.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a smelting method for reducing iron oxide scale on the surface of a slab. Background technique [0002] The iron oxide scale on the surface of the continuous casting slab is formed by the reaction of the iron element on the surface of the slab with the oxidizing gas oxygen and water in the environment at high temperature. The iron oxide content on the surface of the continuous casting slab is too high, which will affect the yield of molten steel and cause unnecessary waste of molten steel. Factors affecting the amount of oxide scale on the surface of the slab and key points of process control include: [0003] 1. Continuous casting secondary water distribution process [0004] The cooling of the billet in the casting direction should be uniform, the atomization effect of the secondary cooling spray water should be good, and the proportion of evaporation should be high to ens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/22
CPCB22D11/22B22D11/225
Inventor 常运合吴伟勤陈从俊
Owner NANJING IRON & STEEL CO LTD