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Method for continuously casting steel plate billets for automotive frames

A technology for automobile girders and steel slabs, which is applied in the field of continuous casting steel slabs for automobile girders, which can solve problems such as increased production costs, scarring on the surface of rolled plates, affecting metal yield and casting slab yield, and prevents cracks , to ensure the effect of lubricity

Inactive Publication Date: 2012-05-09
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after rolling, the corner transverse cracks generated on the continuous casting slab will expand in the longitudinal direction (that is, the length direction of the slab) and cause defects such as scars and streaks on the surface of the rolled slab, thereby affecting the metal yield. and slab yield, leading to an increase in production costs

Method used

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  • Method for continuously casting steel plate billets for automotive frames
  • Method for continuously casting steel plate billets for automotive frames

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Using the method of the present invention to continuously cast a 510L steel slab with a cross-section of 200mm×1080mm, the composition of the 510L steel is shown in Table 1.

[0021] The molten steel of 510L steel is poured from the tundish to the crystallizer, the pouring temperature is 1553°C, and the degree of superheat is 25°C; mold slag is added on the molten steel surface, and the composition of the mold slag is CaO: 25%-35%, SiO 2 : 27%-37%, Al 2 o 3 : 1%-12%, MgO: 1%-10%, Na 2 O: 5%-15%, F - : 1%-10%, the binary alkalinity is 1.04, the viscosity is 0.16Pa·s, the per ton steel consumption of mold flux is 0.51kg / t; The amount of cooling water on the surface is 2930L / min and 380L / min respectively, and the heat flow ratio between the narrow surface and the wide surface is 0.81; the incompletely solidified slab is pulled out from the crystallizer at a pulling speed of 1.1m / min and sequentially After passing through the secondary cooling zone and the air cooling z...

Embodiment 2

[0025] Using the method of Example 1 to continuously cast 510L steel slabs, the pouring temperature is 1558°C, and the degree of superheat is 30°C; mold slag is added on the molten steel surface, the binary alkalinity of the mold slag is 1.1, and the viscosity is 0.12Pa·s. The per ton of steel consumption of mold flux is 0.48kg / t; the cooling water volumes of wide and narrow sides are 2900L / min and 400L / min respectively, and the heat flow ratio of narrow and wide sides is 0.85; the incompletely solidified slab Pull out from the crystallizer at a pulling speed of 1.0m / min and pass through the secondary cooling zone and the air cooling zone in sequence, wherein the specific water content of the secondary cooling zone is 0.55kg / t, and the distance between the The temperatures measured at 12m, 13m, 14m, 15m and 16m of the crystallizer outlet were 992°C, 983°C, 942°C, 969°C and 965°C, respectively.

Embodiment 3

[0027] Using the method of Example 1 to continuously cast 510L steel slabs, the pouring temperature is 1548°C, and the degree of superheat is 20°C; mold slag is added on the molten steel surface, the binary alkalinity of the mold slag is 1.15, and the viscosity is 0.1Pa·s. The consumption of mold flux per ton of steel is 0.55kg / t; the cooling water volumes of the wide and narrow sides are 2950L / min and 360L / min respectively, and the heat flow ratio between the narrow and wide sides is 0.79; The temperatures measured at 12m, 13m, 14m, 15m and 16m of the crystallizer outlet are 982°C, 970°C, 926°C, 953°C and 957°C, respectively.

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Abstract

The invention provides a method for continuously casting steel plate billets for automotive frames, which includes the steps that molten steel is poured into a mold from a tundish, covering slag is added to the liquid level of the molten steel, the molten steel is vibrated by the mold and cooled by a wide surface and a narrow surface to form an incompletely solidified casting blank, and then the casting blank is pulled out of the mold at a casting speed Vc and sequentially passes through a secondary cooling area and an air cooling area to obtain a completely solidified casting blank; the casting speed Vc is controlled within 1.0-1.3m / min; the ratio of the heat flow of the narrow surface to that of the wide surface ranges from 0.75 to 0.85; and the binary alkalinity of the covering slag ranges from 1.0 to 1.15, and the viscosity of the covering slag ranges from 0.10PaXs to 0.25 PaXs. On one hand, the ratio of the heat flow of the narrow surface to that of the wide surface is comprehensively controlled, so that cooling of the molten steel in the mold can be reasonably controlled, namely, the molten steel is evenly cooled along the directions of the wide surface and the narrow surface in the mold to form a crack-free blank shell. On the other hand, by controlling the alkalinity and the viscosity of the covering slag, the covering slag can form flux films with fine lubrication among the blank shell and copper plates of the wide surface and the narrow surface of the mold, so that cracks are prevented.

Description

technical field [0001] The invention relates to a method for continuous casting of steel slabs for automobile girders. Background technique [0002] Steel for automobile frame is mainly used to produce automobile frame and longitudinal and transverse beams of automobile compartment, so the mechanical performance requirements of steel for automobile frame are relatively high. Due to the particularity of its use, steel for automobile beams has very strict requirements on the quality of cast slabs and rolled products. In particular, the surface quality of cast slabs and rolled products must be guaranteed, otherwise it will affect the appearance and cause accidents during use. [0003] Since the carbon content of steel for automobile beams is in the peritectic region, it is a crack-sensitive steel type. During the pouring process, due to the peritectic reaction, the ratio of heat flow on the narrow surface of the crystallizer to the heat flow on the wide surface (referred to as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/00B22D11/111
Inventor 李志强吴国荣曾建华潘红陈永
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES