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Production method for reducing air hole defects of casting blank of ultra low carbon enamel steel with C being less than or equal to 0.0030%

A production method and enamelled steel technology, applied in the field of iron and steel metallurgy, can solve the problems of reducing the number of casting furnaces, not removing pore adsorption, and deteriorating flow field, so as to reduce the pore defects of casting slabs, reduce the surface defect rate, and improve the pourability of molten steel sexual effect

Pending Publication Date: 2020-05-22
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The steel for ultra-low carbon enamel belongs to the titanium-containing aluminum-killed steel. During the continuous casting process, the fine inclusions in the steel are easy to accumulate on the wall of the nozzle to form a flow storage. On the one hand, it will deteriorate the flow field and increase the risk of slag entrainment; on the other hand It will also reduce the number of casting furnaces and increase production costs
[0004] Therefore, in the casting process of steel for enamelling, a large flow rate of stopper rod argon blowing (7L / min~10L / min) is often used to reduce the occurrence of flow accumulation, but this results in a large number of pores on the surface of the slab, especially in the On the narrow surface of the slab, there are often inclusions that have not been removed by adsorption in the pores, and some pores even contain captured mold slag. Although the slab has been flame-cleaned, the pores on the surface of the slab are still difficult to remove, which makes the subsequent rolling process exist. High risk, high incidence of surface defects

Method used

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  • Production method for reducing air hole defects of casting blank of ultra low carbon enamel steel with C being less than or equal to 0.0030%
  • Production method for reducing air hole defects of casting blank of ultra low carbon enamel steel with C being less than or equal to 0.0030%
  • Production method for reducing air hole defects of casting blank of ultra low carbon enamel steel with C being less than or equal to 0.0030%

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Effect test

Embodiment 1

[0032] A production method for reducing porosity defects in cast slabs of ultra-low carbon enamelled steel with C≤0.0030%. The chemical composition mass percentages of ultra-low carbon enamelled steel are: C: 0.0012%, Si: 0.01%, Mn: 0.14%, P: 0.013%, S: 0.027%, Als: 0.042%, Cu: 0.047%, Ti: 0.011%, N: 0.0061%, and the balance is Fe and unavoidable impurities.

[0033] Described production method comprises the following steps:

[0034] 1) Hot metal pretreatment: control of bright surface of slag removal before molten iron > 80%, control of bright side of slag removal after hot metal pretreatment desulfurization > 90%.

[0035] 2) Converter smelting: Converter smelting with top and bottom combined blowing, the flow rate of bottom blowing is 0.10~0.18m 3 / (min·t); after dephosphorization of the converter, the mass percentage of P is 0.012%, and the oxygen at the end of the converter is 411ppm; lime is added to 2.49kg / t steel during the tapping process, and the thickness of slag u...

Embodiment 2

[0042] A production method for reducing porosity defects in cast slabs of ultra-low carbon enamelled steel with C≤0.0030%. The chemical composition mass percentages of ultra-low carbon enamelled steel are: C: 0.0016%, Si: 0.01%, Mn: 0.21%, P: 0.015%, S: 0.022%, Als: 0.027%, Cu: 0.051%, Ti: 0.09%, N: 0.0053%, and the balance is Fe and unavoidable impurities.

[0043] Described production method comprises the following steps:

[0044] 1) Hot metal pretreatment: control of bright surface of slag removal before molten iron > 80%, control of bright side of slag removal after hot metal pretreatment desulfurization > 90%.

[0045] 2) Converter smelting: Converter smelting with top and bottom combined blowing, the flow rate of bottom blowing is 0.10~0.18m 3 / (min·t); The mass percentage of P in the converter is 0.010%, the oxygen at the end of the converter is 456ppm; lime is added to 2.62kg / t steel during the tapping process, and the slag thickness under the converter is 40mm.

[0...

Embodiment 3

[0052] A production method for reducing porosity defects in cast slabs of ultra-low carbon enamel steel with C≤0.0030%. The chemical composition mass percentages of ultra-low carbon enamel steel are: C: 0.0021%, Si: 0.01%, Mn: 0.16%, P: 0.013%, S: 0.030%, Als: 0.035%, Cu: 0.039%, Ti: 0.12%, N: 0.0059%, and the balance is Fe and unavoidable impurities.

[0053] Described production method comprises the following steps:

[0054] 1) Hot metal pretreatment: control of bright surface of slag removal before molten iron > 80%, control of bright side of slag removal after hot metal pretreatment desulfurization > 90%.

[0055] 2) Converter smelting: Converter smelting with top and bottom combined blowing, the flow rate of bottom blowing is 0.10~0.18m 3 / (min·t); the mass percentage of P in the converter is 0.013%, the oxygen at the end of the converter is 389ppm; lime is added in the tapping process of 2.34kg / t steel, and the slag thickness under the converter is 48mm.

[0056] 3) Al...

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Abstract

The invention discloses a production method for reducing air hole defects of a casting blank of ultra low carbon enamel steel with C being less than or equal to 0.0030%. A smelting process adopts a low-oxygen smelting mode to reduce generation of inclusions, the RH alloying process is optimized, and the inclusion removing rate is increased; and a low stopper blowing argon flow is adopted, and thecontinuous casting heats are increased on the basis of decreasing the casting blank defect incidence rate. Low-oxygen smelting of the ultra low carbon enamel steel is achieved, molten steel pourability is improved, generation of the air hole defects of the casting blank is reduced, and the surface defect rate of an ultra low carbon enamel steel plate is decreased to be 3% or below.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a production method for reducing pore defects of C≤0.0030% ultra-low carbon enamel steel billets. Background technique [0002] The enamel steel plate is safe, non-toxic, easy to clean, and prevents rust after being enamelled. It has been widely used in daily life, and is widely used in eating utensils and washing utensils. The excellent properties of high hardness, high temperature resistance, wear resistance and insulation on the metal body make the enamel products more widely used. [0003] The steel for ultra-low carbon enamel belongs to the titanium-containing aluminum-killed steel. During the continuous casting process, the fine inclusions in the steel are easy to accumulate on the wall of the nozzle to form a flow storage. On the one hand, it will deteriorate the flow field and increase the risk of slag entrainment; on the other hand It will also reduc...

Claims

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Application Information

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IPC IPC(8): C21C5/35C21C7/00C21C7/06C21C7/064C21C7/10C22C38/02C22C38/04C22C38/06C22C38/14C22C38/16
CPCC21C5/35C21C7/0006C21C7/06C21C7/064C21C7/10C22C38/001C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14C22C38/16
Inventor 杨克枝王占业常正昇李应江霍俊张立鑫张正群张乔英熊华报
Owner MAANSHAN IRON & STEEL CO LTD
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