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Method for controlling subcutaneous pinholes and bubbles of medium-carbon boron-added steel continuous casting billet

A control method and hypodermic needle technology, which is applied in the field of metallurgy and steelmaking, can solve problems such as edge cracks on narrow surfaces, and achieve the effect of promoting floating removal, strong adaptability and popularization, and simple process

Active Publication Date: 2020-07-10
SD STEEL RIZHAO CO LTD
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  • Summary
  • 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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  • Method for controlling subcutaneous pinholes and bubbles of medium-carbon boron-added steel continuous casting billet
  • Method for controlling subcutaneous pinholes and bubbles of medium-carbon boron-added steel continuous casting billet

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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. Setting range of submerged nozzle automatic slag changing line: the immersion depth i...

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Abstract

The invention relates to a method for controlling subcutaneous pinholes and bubbles of medium-carbon boron-added steel continuous casting billet. The method comprises the following steps that boron content in medium-carbon boron-added steel is reduced; a solid argon-blowing-free stopper rod and an argon-blowing-free upper nozzle are designed and adopted to control the argon source; special protective slag with high basicity and low flame is designed; the argon flow between slide plates is reduced to 2-4 L / min to ensure the back pressure of 0.1-0.2 bar, and micro-positive pressure control is realized; the maximum pulling speed of a medium-carbon boron-added steel casting machine is limited to 1.4 m / min; and different automatic slag changing processes of a submerged nozzle is designed to reduce submerged depth. The influence of boron on solidification of medium-carbon boron-added steel slabs is controlled and reduced by composition design, and the contact time of the protective slag is reduced; the sources of argon and protective slag gas in steel by process design; and the floating removal of the gas in the steel is promoted by process optimization and adjustment, the defects of pinholes and bubbles at the edge of the casting billet is 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 Applications(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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