CN103320589B

CN103320589B - Method for preventing nickelic steel billet from being oxidized in heating process

Info

Publication number: CN103320589B
Application number: CN201310231766.6A
Authority: CN
Inventors: 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
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2013-06-11
Filing date: 2013-06-11
Publication date: 2014-11-05
Anticipated expiration: 2033-06-11
Also published as: CN103320589A

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

A kind of method that prevents nickelic steel billet heat-processed oxidation

Technical field

The invention belongs to steel rolling process technical field, particularly a kind of method being oxidized in heat-processed for reducing the steel billet of high Ni steel grade.

Background technology

Surface oxidation is unavoidable problem in plate of moderate thickness blank heating process, for common steel billet, can the iron scale forming in heat-processed be removed clean by high pressure water.But for the blank of the special substances such as High Nickel Steel, because iron scale is fine and close, iron scale is connected closely with blank matrix, relies on high pressure water cannot remove the iron scale forming in clean heat-processed completely.The iron scale of not disposing will be pressed into surface of steel plate in the follow-up operation of rolling, form surface crater, pit, have a strong impact on product appearance quality, can save by reconditioning, and after increase manufacturing cost and reconditioning, steel plate visual appearance is bad.In addition, do not remove the frictional coefficient in clean iron scale meeting influence of rolled process, cause occurring seriously upwarping or lower button phenomenon in steel plate rolling process, when serious, steel plate cannot complete rolling, will produce rolling waste product.

Summary of the invention

The invention provides a kind of method that prevents nickelic steel billet heat-processed oxidation, its object is intended to reduce oxidated layer thickness, reduces the burn out rate of nickelic steel billet heat-processed, reduces work for the treatment of amount, improves High Nickel Steel product surface quality.

For this reason, the solution that the present invention takes is:

A method that prevents nickelic steel billet heat-processed oxidation, its concrete grammar is:

1, wish is heated to steel billet and wrap up with thickness 0.6-1.2mm cold rolled sheet, and tie up firmly with strapping tape, or with thickness 0.6-1.2mm cold rolled sheet, cover the upper and lower surface of wish heating steel billet, and by the mode of spot welding, cold rolled sheet is fixed on steel billet.

2, the coated steel billet of handling well is sent into process furnace and carry out normal heating, cold rolled sheet and strapping tape be fusing voluntarily in heat-processed.

3, the steel billet heating by process furnace out after, utilize high pressure water that the residue of billet surface is removed clean, then carry out normal rolling.

Beneficial effect of the present invention is:

Owing to being coated cold rolled sheet in steel billet outside, can effectively avoid air to contact with the direct of billet surface, thereby delay the lasting degree of oxidation of billet surface, reduce oxidated layer thickness, reduce the burn out rate of nickelic steel billet heat-processed, reduce surface treatment workload, improve the surface quality of High Nickel Steel product.Utilize the method to produce High Nickel Steel, can reduce steel plate reconditioning quality more than 30%, improve rolling lumber recovery more than 20%.

Accompanying drawing explanation

Fig. 1 ties up parcel steel billet schematic diagram.

In figure: strapping tape 1, snap close 2, edge protector 3, cold rolled sheet 4, steel billet 5.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described.

The present invention prevents that the concrete steps of the method for nickelic steel billet heat-processed oxidation from being:

1, the cold rolled sheet 4 that wish is heated to steel billet 5 use thickness 1.0mm wraps up, and does not stay as far as possible any gap, reduces the possibility contacting with air.With strapping tape 1, tie up in Xiang Ge tri-roads in length and breadth again, and on the edges and corners pad of the steel billet 5 contacting with strapping tape 1 edge protector 3; Then by snap close 2 by strapping tape 1 tension, with excluding air to greatest extent with prevent from being scattered.

Another kind of method for coating is: with thickness 0.8mm cold rolled sheet 4, cover the upper and lower surface of wish heating steel billet 5, and by the mode of spot welding, cold rolled sheet 4 is weldingly fixed on steel billet 5, to prevent that cold rolled sheet 4 from coming off in handling process.

2, the coated steel billet 5 of handling well is sent into process furnace and carry out normal heating, strapping tape 1, snap close 2, edge protector 3 and cold rolled sheet 4 be fusing voluntarily in heat-processed.

3, the steel billet 5 heating by process furnace out after, by high pressure water, the residue on steel billet 5 surfaces is removed clean; If the situation that exists strapping tape 1 to melt not yet completely, the hook of available stock is dragged, and then can carry out normal rolling.

Claims

1. a method that prevents nickelic steel billet heat-processed oxidation, is characterized in that, concrete grammar is:

(1), wish heated to steel billet with the cold rolled sheet of thickness 0.6-1.2mm, wrap up, then tie up in Xiang Ge tri-roads in length and breadth with strapping tape, and on the pad of the edges and corners of the steel billet contacting with strapping tape edge protector; Then by snap close, strapping tape is strained, with excluding air to greatest extent with prevent from being scattered; Or with thickness 0.6-1.2mm cold rolled sheet, cover the upper and lower surface of wish heating steel billet, and by the mode of spot welding, cold rolled sheet is fixed on steel billet;

(2), the coated steel billet of handling well sent into process furnace carry out normal heating, cold rolled sheet and strapping tape be fusing voluntarily in heat-processed;

(3), the steel billet that heats by process furnace out after, utilize high pressure water that the residue of billet surface is removed clean, then carry out normal rolling.