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Manufacturing method for round billets with overlarge cross sections

A technology with a super large section and a manufacturing method, which is applied in the metallurgical field and can solve the problems such as the manufacturing method of a large section round billet that has not been seen.

Active Publication Date: 2015-04-22
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no method for manufacturing a large-section round billet suitable for a full-arc continuous casting machine with an arc radius of 16.5 meters

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment

[0022] This embodiment is based on the process of producing a round billet with a diameter of 900 mm on a full-arc alloy steel continuous casting machine with an arc radius of 16.5 meters. The varieties include low-carbon and low-alloy steels such as S355NL, Q345B, and 15CrMoG.

[0023] 100 to 135 tons of molten steel from the ultra-high-power electric arc furnace is stored in a ladle. After LF refining and VD degassing, it is hoisted to the continuous casting ladle turret, and then injected into the middle with the aid of an Al-Zr-C ladle protection sleeve. The molten steel in the tundish is covered with granular alkaline slag to prevent secondary oxidation of the molten steel and purify the molten steel. The liquid steel level is automatically controlled by controlling the flow of the ladle through a weighing system. The tundish is equipped with a continuous temperature measuring device. Real-time measurement of molten steel can be realized, generally controlled at 13-23°C, t...

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Abstract

The invention belongs to the field of metallurgy, and particularly relates to a manufacturing method for round billets with overlarge cross sections. The manufacturing method includes the steps of 1 pouring, wherein molten steel is poured into a pouring basket from a steel ladle; 2 crystallization, wherein the molten steel in the pouring basket is poured into a crystallizer to obtain casting billets which are not completely solidified, the properties of mould fluxes of the crystallizer are as follows: alkalinity is 0.2-0.5, melting temperature is 980-1130 DEG C, and the viscosity under 1300 DEG C is 12-18 Pa. s, and mould electromagnetic stirring is set as follows: current is 400-500A, and frequency is 3.0-4.0 Hz; 3 billet withdrawal, wherein the billet withdrawal speed is 0.08-0.13m / min; 4 secondary cooling, wherein an upper secondary cooling area adopts full-water strong cooling, a lower secondary cooling area adopts air-water atomization weak cooling, the composite spray water rate is 0.25-0.35L / kg steel; 5 continuous straightening of the casting billets obtained after secondary cooling, wherein the strain rate of straightening is controlled to be from 0.08% to 0.13%. By means of the manufacturing method, the batch production of the round billets with the diameter of 900mm or above is realized based on a full-arc type alloy steel continuous casting machine with the radius of the arc being 16.5m, and additionally, the round billets are good in surface and internal quality.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for manufacturing a round billet with a super large cross-section, which is especially suitable for the production of a round billet with a diameter of more than 900 mm on a full-arc continuous casting machine with an arc radius of 16.5 meters. Background technique [0002] With the rapid development of my country's wind power, petroleum, construction machinery, nuclear power and other high-end manufacturing industries and the increasing scale of equipment, the market urgently needs round billets with larger sizes, more reliable quality, and higher product performance, especially round billets with a diameter of 900mm and The above super large section round billet. Due to the limitations of technological innovation and equipment design and manufacturing capabilities, domestic and foreign large-section continuous casting round billets are far behind the mark...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/04B22D11/18
CPCB22D11/18
Inventor 邵明海戈文英翟正龙于学文窦圣鹏赵冠夫杨普庆李法兴范黎明
Owner SHANDONG IRON & STEEL CO LTD
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