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Technology for producing peritectic steel by ultra-wide slab continuous casting machine

A slab continuous casting machine and production package technology, applied in the field of metallurgy, can solve problems such as difficult uniformity in the width direction of molten steel, uneven shrinkage in the width direction, and aggravation of cracks on the surface of the slab, so as to achieve a low probability of surface cracks and reduce the liquid surface fluctuations and reduce the effect of secondary oxidation

Active Publication Date: 2020-10-13
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that in the continuous casting process of peritectic steel, due to the peritectic reaction and other reasons, the primary slab shell is difficult to be uniform, and the grain sizes are different everywhere, which is very easy to induce the generation of surface longitudinal cracks; Due to the increase in the width of the wide slab, it is more difficult for the molten steel to be uniform in the width direction during the solidification process, and the unevenly solidified slab shell causes uneven shrinkage in the width direction and also aggravates the occurrence of cracks on the surface of the slab

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The process for producing peritectic steel by an ultra-wide slab continuous caster provided in this embodiment comprises the following steps:

[0024] S1. Load pouring molten steel into the ladle, the pouring molten steel is set as peritectic steel, and the carbon content in the peritectic steel is set to 0.12%;

[0025] S2. Fill the tundish with inert gas argon, set the inflation time to 10min or more, set the purity of argon to 99.8%, set the pressure of the sealed argon to 0.4MPa, and set the flow rate to 150l / min;

[0026] S3. Pouring molten steel from the ladle to the tundish by adopting the method of argon seal protection of the protective sleeve, and adding a covering agent to the tundish after pouring;

[0027] S4. Molten steel is injected from the tundish into the crystallizer by means of stopper rods and immersion protection. The contact surface of the crystallizer is sealed with nano-graphite mud, and mold slag is added to the mold after the inj...

Embodiment 2

[0033] Embodiment 2: A kind of ultra-wide slab continuous casting machine production process of peritectic steel provided by this embodiment, comprises the following steps: S1, pouring molten steel into ladle, pouring molten steel is set as peritectic steel, and peritectic The carbon content in the steel is set to 0.12%; S2, fill the tundish with inert gas argon, the filling time is set to more than 8mins, the purity of the argon is set to 99.7%, the pressure of the sealed argon is set to 0.4MPa, and the flow rate is set to 100l / min;

[0034] S3. Pouring molten steel from the ladle to the tundish by adopting the method of argon seal protection of the protective sleeve, and adding a covering agent to the tundish after pouring;

[0035] S4. Molten steel is injected from the tundish into the crystallizer by means of stopper rods and immersion protection. The contact surface of the crystallizer is sealed with nano-graphite mud, and mold slag is added to the mold after the injectio...

Embodiment 3

[0041] Embodiment 3: The process for producing peritectic steel by an ultra-wide slab continuous caster provided in this embodiment includes the following steps:

[0042] S1. Load pouring molten steel into the ladle, the pouring molten steel is set as peritectic steel, and the carbon content in the peritectic steel is set to 0.12%;

[0043] S2. Fill the tundish with inert gas argon, set the inflation time to 5min or more, set the purity of the argon to 99.5%, set the pressure of the sealed argon to 0.3MPa, and set the flow rate to 50l / min;

[0044] S3. Pouring molten steel from the ladle to the tundish by adopting the method of argon seal protection of the protective sleeve, and adding a covering agent to the tundish after pouring;

[0045] S4. Molten steel is injected from the tundish into the crystallizer by means of stopper rods and immersion protection. The contact surface of the crystallizer is sealed with nano-graphite mud, and mold slag is added to the mold after the inje...

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Abstract

The invention discloses a technology for producing peritectic steel by an ultra-wide slab continuous casting machine, and relates to the technical field of metallurgy. Filling of argon is more favorable to inclusion removing, and protective casing argon seal protection and immersion protection further improve purity of molten steel; casting powder is high in alkalinity, so that heat transfer of the casting powder is more uniform, and non-uniformity of a solidification initial stage of a solidified shell is reduced; a cobalt 60 radiation method and a liquid level feedforward control technologygreatly reduce liquid level fluctuation on the basis of realizing automatic detection and control of a liquid level; and aerosol cooling of a secondary cooling zone and a drawing speed are set at a suitable level, fluctuation of the liquid level of a crystallizer can be reduced, and the bonding phenomenon is not prone to generate due to improper control over the drawing speed. By means of the above steps and parameter setting, an initial solidified shell can be more uniform, the grain size can be kept consistent everywhere, during a molten steel solidification process, the solidified shell canbe evenly solidified, and therefore the probability of occurrence of cracks on the surface of a cast blank is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a process for producing peritectic steel by an ultra-wide slab continuous caster. Background technique [0002] The production process of continuously casting high-temperature molten steel into a slab with a certain cross-sectional shape and a certain size is called continuous steel casting, and the equipment required to complete this process is called continuous casting equipment. The electromechanical and hydraulic integration of steel pouring equipment, continuous casting machine body equipment, cutting area equipment, dummy bar collection and conveying equipment constitutes the core equipment of continuous steel casting, which is customarily called continuous casting machine. [0003] In recent years, my country's iron and steel technology has developed rapidly. Among them, the steel plate with C component in the peritectic region has a good balance of strength and toughne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/117B22D11/108B22D11/18B22D11/055B22D11/22B22D11/16B22D11/20
CPCB22D11/117B22D11/108B22D11/187B22D11/055B22D11/225B22D11/166B22D11/20
Inventor 钱志友伏兆勇王雄文雷永佳谢士超冯国辉王坤
Owner NANJING IRON & STEEL CO LTD
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