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Method and apparatus for reaction control

A sealing device and surface reaction technology, applied in the direction of heat treatment process control, manufacturing tools, process efficiency improvement, etc., can solve problems such as parameters that do not allow fine-tuning to control surface reaction

Active Publication Date: 2019-08-20
COCKERILL MAINTENANCE & INGIE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, direct-fired furnaces that operate by adjusting the fuel-air ratio do not allow fine-tuning of the parameters that control surface reactions

Method used

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  • Method and apparatus for reaction control
  • Method and apparatus for reaction control

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Embodiment Construction

[0024] The present invention aims to provide such a method with adjusted process parameters to obtain optimized wettability for alloyed steels. Furnaces have been specially developed for this purpose. This furnace has different parts, each in a different housing that includes means for carefully controlling the atmosphere. The furnace is dedicated to annealing steel sheets coated with a liquid metal comprising Zn, Al or a combination of the two in various proportions, with additions of Mg and Si in proportions higher than 0.1%. The furnace according to the invention can also be used in continuous annealing lines without hot-dip galvanizing installations.

[0025] Such as figure 1 As shown, the furnace consists of three well-defined sections separated by effective seals. Well defined means that each part is located in a housing with its own thermal insulation, heating assembly (if required) and controls for controlling dew point, hydrogen content, oxygen content, Device for...

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Abstract

The invention relates to a method for controlling surface reactions on a steel strip (5) running through a furnace (1) comprising in sequence a first section (2), a second section (3) and a third section ( 4), the atmospheres in the second (3) and third (4) parts are oxidizing and reducing respectively, wherein in the first part (2), the atmosphere is slightly oxidizing to potentially form an iron oxide layer, wherein h 2 content below 2%, O 2 content below 0.1% and H 2 O or CO 2 , or H 2 O+CO 2 The content is higher than 0.03%, and preferably, higher than 0.035%, the percentages being expressed in units of volume.

Description

technical field [0001] The present invention relates to a device and a method for controlling surface reactions on a steel strip conveyed in a continuous galvanizing (galvanizing) or annealing line. Background technique [0002] High strength steel grades usually include high levels of elements such as silicon, manganese and chromium (typically 0.5 to 2%, 1.5 to 6%, 0.3 to 1% by weight, respectively), making them difficult to coat because Oxide layers of those elements are formed during annealing prior to immersion in a galvanizing bath (galvanizing bath). This oxide layer compromises the wettability of the steel surface when submerged in a bath. Thus, poor adhesion of uncoated areas and coatings is obtained. [0003] It is well known that the surface quality and thus the wettability of the steel strip can be improved by adjusting the atmosphere passing through the annealing furnace. For example, patent US 8,636,854 discloses an annealing furnace divided into three zones ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/02C21D9/62C21D9/60C21D9/56C21D9/46C21D1/76C21D11/00
CPCC21D1/76C21D9/46C21D9/561C21D9/60C21D9/62C21D11/00C23C8/10Y02P10/25C23C2/0035C23C2/0038C23C2/0222C23C2/0224
Inventor 米歇尔·杜波依斯
Owner COCKERILL MAINTENANCE & INGIE