Long-life steelmaking tundish dry material processing and using process

A processing technology and long-life technology, applied in the field of refractory materials, can solve the problems of the life-limiting link of slag corrosion resistance, the increase of the temperature of the tundish shell, and the thinning of the dry material of the working layer, so as to improve the service life and improve the Sintering resistance, the effect of solving safety hazards

Pending Publication Date: 2021-08-10
本溪市众信冶金炉料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dry material working lining at the tundish slag line is eroded by the tundish covering agent and steel slag, and its slag erosion resistance becomes the limiting link of the tundish service life
[0004] However, the use time of the existing tundish dry material used for steelmaking generally does not exceed 50 hours. If the time is prolonged, the dry material in the working layer will become thinner, and the temperature of the tundish shell will rise, which will pose a safety hazard to the continuous casting production. Therefore, it is necessary to provide a A long-life steelmaking tundish dry material processing and its application process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The steelmaking tundish dry material processing process includes the following steps:

[0026] Step 1: Determine the formula and conduct tests in the laboratory. The test proves that because silicon carbide has good corrosion resistance and erosion resistance, adding silicon carbide to the slag line dry material can improve its service life, and adding scales to the wall dry material Graphite, which increases resistance to sintering and thus increases service life.

[0027] Step 2: Selection of raw materials. The dry material is made of high-grade fused magnesia and silicon carbide. Put an appropriate amount of fused magnesia, silicon carbide and their auxiliary materials into a mixer to stir and knead to obtain a dry slag line. For the formula material, put appropriate amounts of fused magnesia, silicon carbide and flake graphite into the mixer to stir and knead to obtain the wall-coated dry formula material;

[0028] Step 3: Safe production, marking the production da...

Embodiment 2

[0030] The process of using dry material in steelmaking tundish includes the following steps:

[0031] S1: Arrange technical personnel on site to follow up the construction, use different dry materials for the slag line and cladding wall, and improve the erosion resistance of the slag line dry material and the sintering resistance of the cladding dry material in a targeted manner;

[0032] S2: Technicians track the pouring process, measure the temperature of the tundish shell at any time, and observe whether the dry material falls off during use;

[0033] S3: Measure the slag line erosion thickness and the sintered thickness of the tundish wall after the tundish is used and off-line, track the turning over of the tundish, and observe the difficulty of turning over the tundish;

[0034] S4: Summarize the test data and complete the test.

Embodiment 3

[0035] Embodiment 3, in the step 2 of preparing the intermediate material, an appropriate amount of sintering aid iron red can be added. The raw material magnesia for preparing the intermediate material is ultrafine powder, and the particle size of the ultrafine powder is less than 2 μm. Its raw materials are fused magnesia and silicon carbide. The weight ratio is 4:6. The order of adding raw materials to the mixer in the production steps must be strictly followed. The mixing step is divided into premixing and further mixing. The control time is 20-25 minutes, and further mixing is to put the sintering agent, auxiliary materials and premix into the mixer for mixing, the time is controlled for 15-20 minutes, and the mixing temperature can be controlled at room temperature.

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Abstract

The invention discloses a long-life steelmaking tundish dry material processing and using process, which comprises a steelmaking tundish dry material processing process and a steelmaking tundish dry material using process, and the steelmaking tundish dry material processing process comprises formula determination, raw material selection, safe production, and delivery after production dates and batches are marked. The steelmaking tundish dry material using process comprises the steps that technicians are arranged on site to track construction; the technicians track the steel casting process and measure the temperature of the tundish shell at any time; the erosion thickness of a slag line and the sintering thickness of a tundish wall are measured after the tundish is used off line, the tundish is tracked and turned, and the difficulty of turning the tundish is observed; and test data is summarized. According to the dry material, the service time of the tundish can be greatly prolonged and can reach 50 hours or more, the erosion of an impact area and a slag line position is relatively shallow and is about 1 / 3 of the construction thickness, the tundish wall is basically not eroded, the temperature of a tundish shell is lower than 280 DEG C, the potential safety hazard of the tundish is solved, meanwhile, the cost of refractory materials per ton of steel is reduced, and the tundish runs safely.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a long-life steelmaking tundish dry material processing and its application process. Background technique [0002] Steelmaking refers to controlling the carbon content (generally less than 2%), eliminating harmful elements such as P, S, O, and N, retaining or increasing beneficial elements such as Si, Mn, Ni, and Cr, and adjusting the ratio of elements to obtain the best Performance, put the pig iron for steelmaking into the steelmaking furnace and smelt it according to a certain process to obtain steel. Steel products include steel ingots, continuous casting slabs and direct casting into various steel castings. Generally speaking, steel generally refers to steel rolled into various steel products. Steel belongs to ferrous metal but steel is not exactly equal to ferrous metal. [0003] The tundish is located between the ladle and the mold, and is used to receive molten stee...

Claims

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Application Information

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IPC IPC(8): C04B35/04
CPCC04B35/04C04B2235/3826C04B2235/9607
Inventor 余澍
Owner 本溪市众信冶金炉料有限公司
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