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A method for controlling pinhole air bubbles under the skin of medium-carbon boron-added steel continuous casting slabs

A control method and hypodermic needle technology, applied in the field of metallurgical steelmaking, can solve problems such as narrow face edge cracks, and achieve the effects of promoting floating removal, reducing contact time, strong adaptability and popularization

Active Publication Date: 2021-08-10
SD STEEL RIZHAO CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for controlling the subcutaneous pinhole air bubbles of medium-carbon boron-added steel continuous casting slabs with simple process and strong adaptability, so as to solve the narrow-face edge cracks that often occur in carbon-boron-added steel in the production of hot-rolled coils and thick plates defect problem

Method used

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  • A method for controlling pinhole air bubbles under the skin of medium-carbon boron-added steel continuous casting slabs
  • A method for controlling pinhole air bubbles under the skin of medium-carbon boron-added steel continuous casting slabs

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Embodiment 1

[0034] In this embodiment, a factory adopts a straight-arc continuous casting machine with a thickness of 230 mm and a section of 1520 mm to produce medium-carbon boron-added steel. This process is adopted. The parameter settings of this embodiment are:

[0035] 1. The boron content in the steel is controlled at 0.0010%.

[0036] 2. The tundish is equipped with a solid non-argon blowing stopper rod and a non-argon blowing nozzle.

[0037] 3. The composition of special mold flux is C-4.7%, CaO-37.7%, SiO 2 -28.6%, Fe 2 o 3 -0.95%, MgO -2.3%, Al 2 o 3 -4.15%, K 2 O+Na 2 O-7.8%, F-8.9%, Li 2 O-1.12%, volatile matter 3.73%, melting point 1136°C, viscosity 0.116PaS, density 0.76g / ml.

[0038] 4. The flow rate of argon blowing between the slide plates is 3.6L / min, and the back pressure is guaranteed to be 0.12bar.

[0039] 5. Casting machine casting speed control 1.0-1.4m / min.

[0040] 6. The setting range of the automatic slag changing line of the submerged nozzle: the im...

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Abstract

The invention relates to a method for controlling subcutaneous pinhole air bubbles in medium-carbon boron-added steel continuous casting slabs. Gas source; design a special mold flux with high alkalinity and low flame; reduce the flow rate of argon blowing between slide plates to 2-4L / min, ensure the back pressure of 0.1-0.2bar, and realize micro-positive pressure control; medium-carbon boron-added steel casting machine The maximum casting speed is limited to 1.4m / min; different immersion nozzle automatic slag changing line technology is designed to reduce the immersion depth. Reduce the influence of boron on the solidification of medium-carbon boron-added steel slabs through composition design control, and reduce the contact time of mold slag; reduce the source of gas argon and mold slag in steel through process design; promote the gas in steel through process optimization and adjustment Floating removal, the pinhole bubble defects at the edge of the slab are well controlled, the process is simple, and the adaptability and popularization are strong.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and steelmaking, and in particular relates to a method for controlling subcutaneous pinhole air bubbles of medium-carbon boron-added steel continuous casting slabs. Background technique [0002] Pinholes and bubble defects at the corners of continuous casting thick slabs are common defects in continuous casting slabs, and shallow pinhole defects do not affect the rolling quality of steel plates. The addition of boron to medium carbon is widely used in the field of steel export. The advantage of adding boron is to increase the hardenability of steel and improve the high temperature strength of steel, thereby saving other alloys. Compared with ordinary medium-carbon steel without boron addition, medium-carbon steel with boron added will have more subcutaneous pinholes and bubble defects on the edge, which will seriously affect the rolling quality of continuous casting slabs. [0003] According t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111B22D11/18B22D11/20C21C7/04
CPCB22D11/111B22D11/18B22D11/20C21C7/04
Inventor 陈常义胡勤东高龙永温维新邵明海赵孝伦牛宏波赵亮马强王兴温福新
Owner SD STEEL RIZHAO CO LTD
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