Surface iron scale control method for middle sheet billet continuous casting and rolling steel plate

A technology of continuous casting and surface oxidation of medium and thin slabs, applied in metal rolling, temperature control, metal rolling, etc. and investment, etc., to achieve the effect of obvious energy saving effect, reducing rolling pressure and improving descaling effect.

Inactive Publication Date: 2007-08-08
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that it is necessary to add several special equipment such as pressing rollers and supporting rollers, which increases the investment; the process of leveling and tensioning is added, which increases the production cost; this method is only suitable for the production of cold-rolled strip steel. It is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 4

[0039] The continuous casting and rolling process system of example 4 is:

[0040] The superheated temperature of molten steel in the tundish is controlled at 30°C, and the casting speed is 2.0-3.0m / min.

[0041] Hot charging and heating to 1180°C, heat preservation for 50min; temperature of descaling point before rough rolling after the furnace is 1160°C, pressure 17MPa;

[0042] The rough rolling start temperature is 1090°C, the finish rolling temperature is 1000°C, and the final rolling temperature is 890°C; the laminar cooling rate after rolling is 8°C / s. The coiling temperature is 590°C.

[0043] Examples 2, 3, 5 and other hot-rolled steel plate continuous casting and rolling process systems within the composition control scope of the present invention are similar to examples 1 and 4 with minor differences. Specifically:

[0044]During continuous casting, the superheated temperature of molten steel in the tundish is <40°C, the liquid level fluctuation range of the crys...

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PUM

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Abstract

The invention discloses a controlling method of iron oxide sheet of rolled band steel surface of middle-thin board blank, which is characterized by the following: controlling component; proceeding heat load directly; heating to remove phosphor; rolling under high temperature; forcing to cool; controlling Si content in the steel; eliminating red ferric oxide on the surface of heat roll steel; fitting for the steel with not more than 0.18%C, not more than 0.20% Si, not more than 1.50% Mn, not more than 0.015% P, not more than 0.01% S and Nb, V and Ti.

Description

technical field [0001] The invention belongs to a steel plate surface treatment technology, in particular to a method for removing surface oxide scales during continuous casting slab heating and rolling. Background technique [0002] During the process of heating, conveying and rolling, due to the reaction with oxygen, a certain amount of iron oxide scale will inevitably be produced on the surface of the casting slab or steel slab. If it cannot be removed well, it will greatly affect the surface quality of the rolled steel plate. Therefore, all manufacturers have given full attention and in-depth research to eliminating the oxide scale on the surface of the billet, and have taken various measures to solve it. [0003] So far, although there are many measures to remove the iron scale on the surface of the billet, almost all solutions adopt a single physical method, that is, mechanical descaling, high-pressure water descaling, shot peening or bending deformation to remove the ...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B1/46B22D11/16B21B37/74B21D5/00B21B45/04
Inventor 于洋郭晓波钟莉莉关菊刘振宇唐帅
Owner ANGANG STEEL CO LTD
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