Method for preventing nickelic steel billet from being oxidized in heating process

A billet heating and billet technology, which is applied in the field of reducing the oxidation of high Ni steel billets during the heating process, can solve the problems of inability to completely remove the scale, poor appearance quality of the steel plate, and affect the friction coefficient, etc., so as to delay the degree of continuous oxidation , Reduce the thickness of the oxide layer, improve the effect of rolling yield

Active Publication Date: 2014-11-05
ANGANG STEEL CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

However, for billets made of special materials such as high-nickel steel, due to the dense iron oxide scale, the iron oxide scale is closely connected with the base of the billet, and it is impossible to completely remove the iron oxide scale formed during the net heating process by relying on high-pressure water.
The unremoved iron oxide scale will be pressed into the surface of the steel plate in the subsequent rolling process, forming surface pits and pits, which seriously affect the appearance quality of the product, which can be rescued by grinding, which will increase the manufacturing cost and reduce the appearance of the steel plate after grinding. Poor quality
In addition, the unremoved iron oxide scale will affect the friction coefficient during the rolling process, resulting in serious upturning or buckling during the rolling process of the steel plate. In severe cases, the steel plate cannot be rolled completely, and rolling waste will be generated.

Method used

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  • Method for preventing nickelic steel billet from being oxidized in heating process

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with accompanying drawing.

[0014] The concrete steps of the method that the present invention prevents high-nickel billet heating process oxidation are:

[0015] 1. Wrap the steel billet 5 to be heated with a cold-rolled thin plate 4 with a thickness of 1.0 mm, leaving no gaps as much as possible to reduce the possibility of contact with air. Then use the strap 1 to bind three times vertically and horizontally, and pad the edges 3 at the corners of the steel billet 5 that is in contact with the strap 1; Prevent scatter.

[0016] Another cladding method is: cover the upper and lower surfaces of the billet 5 to be heated with a cold-rolled sheet 4 with a thickness of 0.8mm, and weld and fix the cold-rolled sheet 4 on the billet 5 by spot welding to prevent the cold-rolled sheet from 4 falls off during lifting.

[0017] 2. Send the coated billet 5 into the heating furnace for normal heating, and the ...

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Abstract

The invention provides a method for preventing a nickelic steel billet from being oxidized in a heating process. The method comprises the following steps of: wrapping the steel billet by using a cold-rolled sheet, firmly strapping the steel billet by using a strapping tape or covering the cold-rolled sheet on the upper and lower surfaces of the steel billet, and fixing the cold-rolled sheet on the steel billet by using a shot-welding way; putting the steel billet into a furnace, and then, normally heating so that the cold-rolled sheet and the strapping tape are automatically melted in the heating process; and clearing residues on the surface of the steel billet by using high-pressure water after the steel billet is taken out of the furnace, and then, normally rolling the steel billet. By using the method, the direct contact between air and the surface of the steel billet can be avoided, so that the continuous oxidation degree on the surface of the steel billet is delayed, the thickness of an oxidation layer is reduced, the burn out rate of the nickelic steel billet in the heating process is reduced, the workload for surface treatment is reduced, and the surface quality of a nickelic steel product is improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling technology, and in particular relates to a method for reducing oxidation of a billet of a high-Ni steel type during a heating process. Background technique [0002] Surface oxidation is an unavoidable problem during the heating process of medium and thick plate billets. For ordinary billets, the iron oxide scale formed during the heating process can be removed by high-pressure water. However, for billets made of special materials such as high-nickel steel, due to the dense iron oxide scale, the iron oxide scale is closely connected with the base of the billet, and it is impossible to completely remove the iron oxide scale formed during the net heating process by relying on high-pressure water. The unremoved iron oxide scale will be pressed into the surface of the steel plate in the subsequent rolling process, forming surface pits and pits, which seriously affect the appearance quality of the...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C21D1/70
CPCY02P10/20
Inventor李靖年刘浩岩张健王若钢李新玲王明林张紫茵丛津功陈付振孙铁彪
OwnerANGANG STEEL CO LTD