Continuous casting method for low-alloy steel wide and thick slabs

A low-alloy steel, continuous casting technology, applied in the field of continuous casting, can solve problems such as unsuitable secondary cooling system, and achieve the effects of optimizing product quality, optimizing heat flow, and reducing cracks

Inactive Publication Date: 2014-09-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the enlargement of the slab section, surface defects of the slab (such as longitudinal crack defects and transverse crack defects) and internal defects of the slab (such as slab deformation and center porosity, etc.) will be enhanced

Method used

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  • Continuous casting method for low-alloy steel wide and thick slabs
  • Continuous casting method for low-alloy steel wide and thick slabs
  • Continuous casting method for low-alloy steel wide and thick slabs

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Embodiment

[0032] Carry out 11 groups of continuous casting operations to produce low-alloy steel wide and thick slabs. The steel type of the low-alloy steel wide-thick slabs produced by the 1st to 8th groups is P510L, and the steel types of the low-alloy steel wide-thick slabs produced by the 9th to 11th groups are respectively They are X80, X60 and P590L, wherein Groups 1 to 6 and Groups 9 to 11 are cast by the method of the present invention, and Groups 7 and 8 are comparative examples. Each group casts 1,000 furnaces of molten steel. The continuous casting equipment used in these 11 groups of continuous casting operations is a straight arc continuous casting machine. In each continuous casting operation, molten steel is poured from the tundish to the crystallizer; Covering agent is added; in the crystallizer, mold slag is added on the liquid surface of the molten steel, and the molten steel is solidified into a billet with a liquid core by cooling in the crystallizer; then the billet ...

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Abstract

The invention discloses a continuous casting method for low-alloy steel wide and thick slabs. The continuous casting method comprises the following steps: pouring molten steel from a tundish into a crystallizer; in the crystallizer, adding casting powder on the liquid level of molten steel; enabling the molten steel to form casting blanks with liquid cores through the vibration of the crystallizer and the cooling action of the wide surface and the narrow surface of the crystallizer, and then continuously pulling out the casting blanks with the liquid cores from the outlet of the crystallizer at a pulling speed Vc to pass through a secondary cooling zone so as to obtain completely solidified casting blanks. The continuous casting method is characterized in that the crystallizer is composed of a copper plate, the flow speed of cooling water in cooling water seams of the copper plate is 8.8-9.3m/s, and the specific value of the narrow surface heat flow and the wide surface heat flow of the crystallizer is 0.85-0.95. As the cooling schedule of the crystallizer is reasonably controlled, the continuous casting method can reduce the surface cracks of the produced wide and thick slabs and optimize the product quality.

Description

technical field [0001] The invention relates to the field of continuous casting, in particular to a method for continuous casting of low-alloy steel wide and thick slabs. Background technique [0002] Energy and petrochemical, high-speed transportation, equipment manufacturing and other national key development and revitalization industries all require a large amount of high-quality, large-scale steel products. Therefore, in order to meet the production needs of wide and thick slabs, large-scale slab sections are one of the important ways. However, with the enlargement of the slab section, surface defects of the slab (such as longitudinal crack defects and transverse crack defects) and internal defects of the slab (such as slab deformation and center porosity, etc.) will be enhanced accordingly. Therefore, it is necessary to aim at the solidification characteristics of wide and thick slabs, and formulate a suitable continuous casting method according to the thickness and te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/22
Inventor 吴国荣陈永曾建华潘红李志强唐生斌
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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