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Continuous casting thick slab with high-density core and production method thereof

A production method and density technology, applied in the manufacture of converters, etc., can solve problems such as segregation and cracks in the center of the slab, and achieve the effects of high core density, low risk of internal cracks, and large thickness of the slab

Active Publication Date: 2022-01-21
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is that it is not necessary to renovate the continuous casting machine under heavy pressure, and overcome defects such as slab center segregation and cracks in the production of core high-density continuous casting thick slabs in the prior art, Provided is a core high-density continuous casting thick slab and its production method

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  • Continuous casting thick slab with high-density core and production method thereof
  • Continuous casting thick slab with high-density core and production method thereof

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Embodiment 1

[0038] This embodiment provides a production method of high-density continuous casting thick slabs at the core. The continuous casting thick slabs go through the main processes of "hot metal pre-desulfurization→converter smelting→LF refining→RH vacuum refining→continuous casting":

[0039] ①Steelmaking process, the molten iron mixed into the converter must be desulfurized pre-treated and cleaned of slag, the sulfur content is 0.0028%, the temperature is 1380°C, and the impurity content in the scrap steel is controlled (the sulfur content is 0.005%); the phosphorus content of the converter tapping is 0.0052%, the sulfur content is 0.0035%, the tapping temperature of the converter is 1660°C, and the basicity of the final slag of the converter is 3.8.

[0040]② Refining process, after the molten steel is in place, open the bottom and blow argon, the pressure is 0.5Mpa, the LF power-on time is 12min, and the deep degassing time is 25min under the condition of RH vacuum degree ≤ 2mb...

Embodiment 2

[0045] This embodiment provides a production method of high-density continuous casting thick slabs at the core. The continuous casting thick slabs go through the main processes of "hot metal pre-desulfurization→converter smelting→LF refining→RH vacuum refining→continuous casting":

[0046] ①Steelmaking process, the molten iron mixed into the converter must be desulfurized pre-treated and slag cleaned, the sulfur content is 0.0022%, the temperature is 1375 °C, and the impurity content in the scrap steel is controlled (the sulfur content is 0.005%); the phosphorus content of the converter tapped steel is 0.0048%, the sulfur content is 0.0031%, the tapping temperature of the converter is 1652°C, and the basicity of the final slag of the converter is 3.7.

[0047] ② Refining process, after the molten steel is in place, open the bottom and blow argon, the pressure is 0.5Mpa, the LF power-on time is 15min, and the deep degassing time is 20min under the condition of RH vacuum degree ≤...

Embodiment 3

[0052] This embodiment provides a production method of high-density continuous casting thick slabs at the core. The continuous casting thick slabs go through the main processes of "hot metal pre-desulfurization→converter smelting→LF refining→RH vacuum refining→continuous casting":

[0053] ①Steelmaking process, the molten iron mixed into the converter must be desulfurized pre-treated and cleaned of slag, the sulfur content is 0.0031%, the temperature is 1392°C, and the impurity content in the scrap steel is controlled (the sulfur content is 0.005%); the phosphorus content of the converter tapping is 0.0057%, the sulfur content is 0.0030%, the tapping temperature of the converter is 1668°C, and the basicity of the final slag of the converter is 4.0.

[0054] ② Refining process, after the molten steel is in place, open the bottom and blow argon, the pressure is 0.5Mpa, the LF power-on time is 10min, and the deep degassing time is 30min under the condition of RH vacuum degree ≤ 2m...

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Abstract

The invention belongs to the technical field of steel smelting, and particularly relates to a continuous casting thick slab with a high-density core and a production method thereof. The production method mainly comprises the working procedures of molten iron pre-desulfurization, converter smelting, LF refining, RH vacuum refining, continuous casting and the like. In the field, it is generally considered that high pulling speed and the high superheat degree are not beneficial to control over casting blank segregation, but according to the method, high pulling speed (0.7-0.8 m / min) and high superheat degree (35-50 DEG C) casting and secondary cooling area forced cooling technologies are adopted, columnar crystal growth is promoted, and it is kept that a center liquid core has good fluidity while the high density of columnar crystals is guaranteed; and according to segregation, looseness and deformability characteristics of the liquid core under different solid-phase fractions, different pressing rates are adopted in different solid-phase fraction intervals, reverse flow of center-concentrated molten steel is promoted, center segregation of a casting blank is reduced, internal density is improved, and meanwhile, cracks are not generated.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a high-density continuous casting thick slab at the core and a production method thereof. Background technique [0002] With the rapid development of my country's economy, heavy machinery, transportation, petrochemical, shipbuilding, marine engineering and other fields have developed rapidly. At the same time, higher requirements have been put forward for the quality and size of steel materials, which has greatly promoted the production of thick steel plates. The rapid development of technology and equipment technology. The continuous casting metal yield reaches 98%, which is much higher than the traditional die casting process. The continuous casting process has a fast cooling rate and light element segregation. At the same time, it saves the blanking process, shortens the production process, and is easy to realize mechanical automation, thus becoming ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/18B22D11/22C21C5/28C21C7/10C21C7/04C22C38/14
CPCB22D11/18B22D11/225C21C5/28C21C7/10C21C7/04C22C38/14Y02P10/20
Inventor 麻晗马建超张康晖
Owner ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD
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