Method for implementing direct conveying and charging of high-strength low alloy steel continuously-cast bloom

A low-alloy steel and continuous casting billet technology is applied in the field of realizing high-strength low-alloy steel continuous casting billets directly sent to rolling mills or workshops, which can solve problems such as constraints, asynchronous phase transformation, and cracks on the surface of steel plates.

Active Publication Date: 2011-11-02
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, cracks are prone to appear on the surface of the steel plate during the hot delivery process of the high-strength low-alloy steel continuous casting billet. On the one hand, due to the difference between the surface and internal temperature of the slab, the phase transformation is not synchronized, resulting in temperature stress and structural stress on the surface of the slab. The precipitation on the austenite grain boundary has a weakening effect on the grain boundary, which leads to the brittleness of the steel at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Implementation example 1: In a steel plant 300mm×2500mm medium carbon C-Mn-Al steel continuous casting slab before adopting the direct loading process of the present invention, the surface cracks of the 30-40mm steel plate produced by the ordinary hot loading process The incidence is 14%. After adopting the direct loading process of the present invention, the surface temperature of the continuous casting slab before cooling is 750-770℃, which is higher than that of the produced steel grade A r3 The temperature is quickly cooled by water nozzles on the roller table of the continuous casting machine at a cooling rate of 5°C / s. The surface temperature of the continuous casting billet is cooled to 470°C, and then heated on the roller table after 10 minutes of reheating. The thickness of the steel plate after rolling is 30-40mm, and there is no crack on the surface of the steel plate.

Example Embodiment

[0022] Implementation Example 2: Surface cracks on the surface of the 20-40mm steel plate produced by the ordinary hot-delivery hot-charging process before the 300mm×2000mm medium-carbon C-Mn-Nb-Al steel continuous casting slab of a steel plant adopts the direct loading process of the present invention The incidence rate is 13.6%. After adopting the direct loading process of the present invention, the surface temperature of the continuous casting slab before cooling is 730-750°C, which is higher than that of the produced steel grade A r3 The temperature is quickly cooled by water nozzles on the continuous casting roller table. The cooling rate is 4°C / s. The surface temperature of the continuous casting slab is cooled to 480°C, and then heated on the roller table after 10 minutes of re-temperature. The thickness of the steel plate after rolling is 20-40mm, and there is no crack on the surface of the steel plate.

Example Embodiment

[0023] Implementation example 3: A steel mill 190mm×2000mm medium carbon C-Mn-Nb-Al steel continuous casting slab before adopting the direct loading process of the present invention, the surface of 20-30mm thick steel plate produced by the ordinary hot loading and hot loading process The crack occurrence rate is 15.2%. After adopting the direct loading process of the present invention, the surface temperature of the continuous casting slab before cooling is 670-680°C, which is lower than that of the produced steel grade A r3 The temperature is quickly cooled by water nozzles on the continuous casting roller table. The cooling rate is 2°C / s. The surface temperature of the continuous casting slab is cooled to 460°C, and then heated on the roller table after 5 minutes of reheating. The thickness of the steel plate after rolling is 20-30mm, and there is no crack on the surface of the steel plate.

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Abstract

The invention discloses a method for implementing direct conveying and charging of a high-strength low alloy steel continuously-cast bloom. The method comprises the following steps of: 1) quickly cooling the continuously-cast bloom on a continuous casting roller bed to the temperature of below 500 DEG C at the speed of 2 to 5 DEG C per second; and 2) directly charging the continuously-cast bloom into a heating furnace after quick cooling and after the temperature recovery time of over 5 minutes. By the method, the surface of a steel plate is prevented from cracking when the high-strength low alloy steel continuously-cast bloom is produced by adopting a common thermal conveying and thermal charging process, so that direct conveying and charging and even thermal conveying of the high-strength low alloy steel continuously-cast bloom become possible, and energy conservation and consumption reduction are realized. For a steel mill with limited casting blank piling site, the method can solve the contradiction between yield improvement and insufficient casting blank piling site.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and particularly relates to a method for directly sending high-strength low-alloy steel continuous casting slabs to rolling mills or workshops. The thermal charging of the slab at the temperature in the two-phase region has obvious effects on the cracks on the surface of the steel plate. [0002] Background technique [0003] For some iron and steel plants that mainly produce high-strength low-alloy steel, especially those with a compact layout and insufficient slab stacking space, the traditional production mode of slab stack cooling-furnace heating-rolling has seriously affected Accelerated production rhythm and smooth logistics have become the restrictive links for such steel mills to improve production efficiency. [0004] The technology of direct feeding and loading of continuous casting slabs has obvious effects on shortening the process flow and alleviating the contradi...

Claims

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Application Information

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IPC IPC(8): B22D11/124
Inventor 王谦李玉刚鲁永剑何生平杨颖
Owner CHONGQING UNIV
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