Comprehensive control method of medium-carbon niobium-containing steel narrow face lateral fissure of thick plate blank

A comprehensive control and thick slab technology, applied in the field of steelmaking-continuous casting, can solve problems such as side cracks on narrow surfaces, achieve the effects of reducing side cracks, smooth continuous casting production process, and increasing high-temperature thermoplasticity

Active Publication Date: 2014-03-05
SHOUGANG CORPORATION
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for comprehensively controlling side cracks in narrow faces of carbon-niobium-containing steels in thick

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  • Comprehensive control method of medium-carbon niobium-containing steel narrow face lateral fissure of thick plate blank

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Embodiment Construction

[0020] A steel plant adopted this process when casting 300mm×2000mm medium-carbon and niobium-containing continuous casting slabs on a continuous casting machine. 2 -26.9%, Fe 2 o 3 -0.5%, MgO-1.3%, Al 2 o 3 -4.3%, K 2 O+Na 2 O-8%, F-6.9%, Li 2 O-1.87%, BaS-1.5%, volatile matter 5.73%, melting point 1130°C, viscosity 0.118PaS, density 0.83g / ml; immersion depth is 165mm when casting 1-5 furnaces, 155mm when casting 6-10 furnaces, 11- It is 145mm for 15 furnaces, and 135mm for 16-19 furnaces; the taper coefficient is 1.0%, the water volume of the foot roll is 149.5L / min, the casting process is stable, the surface quality of the slab is good, and the narrow side cracks are well improved.

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Abstract

The invention provides a comprehensive control method of medium-carbon niobium-containing steel narrow face lateral fissure of thick plate blank, and belongs to the technical field of steelmaking-continuous casting. The method includes the steps that special medium-carbon niobium-containing steel casting powder suitable for casting components within a peritectic range is designed; different immersion depth change technologies are designed for submersed nozzles according to continuous casting furnace times and specific steel types; the taper value of a crystallizer is 0.95%-1.05%; the narrow face foot roller water yield is set as 145L/min-160L/min. The method has the advantages that the method is relatively simple and is high in generalization performance, the thickness of the continuous casting plate blank which the method is applicable to ranges from 300-420mm, and the width ranges from 1600 to 3000mm. After the method is used, the medium-carbon niobium-containing steel narrow face lateral fissure of the thick plate blank is well controlled.

Description

technical field [0001] The invention belongs to the technical field of steelmaking-continuous casting, and in particular provides a method for comprehensively controlling side cracking of the narrow surface of carbon-niobium-containing steel in thick slabs. The applicable continuous casting slab thickness specification range is 300-420mm, and the width specification range is 1600-3000mm. Background technique [0002] Narrow side cracking is a unique defect that occurs on thick slabs and extra-thick slabs. Compared with thin slabs, thick slabs have longer crystallizer foot rolls because of their thicker thickness, and the narrower spray area is larger. The narrow side of the slab is more affected by the extrusion of the foot roll and the cooling of the narrow side, so the occurrence of side crack defects on the narrow side of the thick slab is greater. Adding niobium to steel can refine grains and improve strength and toughness at the same time. However, surface defects will...

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Application Information

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IPC IPC(8): B22D11/18B22D11/111
Inventor 赵新宇甄新刚刘洋朱志远关春阳赵晶王志刚周德光白学军姜中行王玉龙王臻明杨建平周金明张虎成孙博吕延春王海宝
Owner SHOUGANG CORPORATION
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