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Method for producing high-alloy high-strength peritectic steel with compact strip production (CSP) sheet continuous casting machine

A high-strength, continuous casting machine technology, applied in the field of thin slab continuous casting, can solve the problems of surface longitudinal cracks, aggravate surface longitudinal cracks, grain boundary embrittlement, etc., achieve uniform stress, and solve the effect of deep surface vibration

Active Publication Date: 2018-11-16
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reasons are as follows: (1) Steels with a carbon content in the range of 0.08%-0.12% undergo peritectic reaction during the initial solidification process, and this process is accompanied by a large linear shrinkage. The thermal resistance increases due to the air gap, the thickness of the billet shell is uneven, resulting in sags, and longitudinal cracks are generated due to thermal stress and mechanical stress in the crystallizer, which may cause surface longitudinal crack defects in light cases, or cracks and breakout accidents in severe cases
(2) Nb, Ti, Mo, Cr and other alloying elements can effectively improve the strength of steel, but at the same time, it also increases the precipitation of fine carbon, nitrogen and carbonitride along the austenite grain boundary, resulting in grain boundary brittleness. If the secondary cooling water distribution is unreasonable, the longitudinal cracks on the surface will be aggravated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The specific casting parameters and operation steps are as follows:

[0018] 1) After molten iron desulfurization, converter decarburization and dephosphorization, and LF refining treatment, the qualified molten steel composition is: C is 0.088%, Si is 0.44%, Mn is 1.50%, S is 0.006%, P is 0.014%, and Nb is 0.035%, Ti is 0.020%, Mo is 0.23%, Cr is 0.16%, and the rest is Fe and trace elements;

[0019] 2) The tundish protective casting with air curtain retaining wall is installed. During the casting process, the superheat of molten steel is controlled at 20°C, the flow rate of argon gas at the air curtain retaining wall is controlled at 0.55Mpa, and the flow rate of argon gas sealing at the long nozzle of the ladle is 8.35Nm 3 / h, the MgO% content of the covering agent used is 82.3%, and the silicon content is 2.38%;

[0020] 3) For primary cooling of the funnel-type thin-plate continuous casting mold, the basicity of the mold slag used is 1.10, the melting temperature ...

Embodiment 2

[0025] The specific casting parameters and operation steps are as follows:

[0026] 1) After molten iron desulfurization, converter decarburization and dephosphorization, and LF refining treatment, the qualified molten steel composition is: C is 0.126%, Si is 0.41%, Mn is 1.48%, S is 0.006%, P is 0.012%, and Nb is 0.026%, Ti is 0.024%, Mo is 0.21%, Cr is 0.18%, and the rest is Fe and trace elements;

[0027] 2) The tundish protective casting with air curtain retaining wall is installed. The superheat of molten steel is controlled at 23°C during the casting process, the argon gas flow rate of the air curtain retaining wall is controlled at 0.58Mpa, and the argon gas sealing flow rate of the long nozzle of the ladle is 8.64Nm 3 / h, the MgO% content of the covering agent used is 82.3%, and the silicon content is 3.11%;

[0028] 3) For primary cooling of the funnel-type thin-plate continuous casting mold, the basicity of the mold slag used is 1.11, the melting temperature is 1060...

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Abstract

The invention discloses a method for producing a high-alloy high-strength peritectic steel with a compact strip production (CSP) sheet continuous casting machine. The method comprises the following steps that preliminary desulphurization of molten iron is conducted; decarburization, dephosphorization and transition of furnace are conducted; refining treatment outside a ladle furnace(LF) is conducted, and qualified molten steel is obtained; tundish protective casting of an air curtain retraining wall is mounted; first cooling of a funnel type sheet continuous casting machine is conducted; recooling with automatic water distribution is conducted; push bending and straightening are conducted; shearing of a mechanical swinging shear is conducted; and high-alloy high-strength peritectic steel casting blanks are obtained. According to the method for producing the high-alloy high-strength peritectic steel with the CSP sheet continuous casting machine, cooperation of water volume and water temperature is achieved through adoption of high crystallization rate casting powder and a crystallizer, and low cooling is achieved; generation of surface indentation and cracks of blank shell in the crystallizer because peritectic characteristic line contracts too much is effectively controlled; the problem that surface vibration is deep is effectively solved through high-frequency and small-amplitude technology; smooth casting and stable control over quality of the high-alloy high-strength peritectic steel under the CSP sheet continuous casting high pulling speed are achieved; compared with the prior art, surface defect rate of the casting blanks is controlled below 0.5%; and international advanced level is reached.

Description

technical field [0001] The invention belongs to the technical field of thin slab continuous casting, and in particular relates to a method for producing high-alloy high-strength peritectic steel by a CSP thin-slab continuous casting machine. Background technique [0002] Peritectic steel series, especially high-alloy high-strength peritectic steel continuous casting production currently has technical problems such as unsmooth casting and surface quality control. Currently, it is only produced in conventional slabs and medium-thin slab continuous casting machines worldwide. There is no precedent for successful production of CSP thin slab continuous caster. The existing published peritectic steel production technology cannot meet the production and quality control requirements of CSP thin-slab continuous casting cast high-alloy high-strength peritectic steel. [0003] CSP thin plate continuous casting has its own advantages of low-cost manufacturing due to its high casting sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/26C22C38/28C22C38/22B22D11/111B22D11/055B22D11/22
CPCB22D11/055B22D11/111B22D11/22C22C38/02C22C38/04C22C38/22C22C38/26C22C38/28C22C38/38
Inventor 谯德高张长顺冯永平张荣堂马金邦
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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