CN103769424A - Method for controlling red oxide scale on surface of steckel mill steel plate - Google Patents
Method for controlling red oxide scale on surface of steckel mill steel plate Download PDFInfo
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- CN103769424A CN103769424A CN201410007581.1A CN201410007581A CN103769424A CN 103769424 A CN103769424 A CN 103769424A CN 201410007581 A CN201410007581 A CN 201410007581A CN 103769424 A CN103769424 A CN 103769424A
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Abstract
The invention relates to the method for controlling a red oxide scale on the surface of a steckel mill steel plate. The method comprises the following steps that a casting blank enters a heating furnace for heating, oxide scale removal of the casting blank is conducted through high pressure water after the casting blank is discharged out of the furnace, rough rolling is conducted on the casting blank after oxide scale removal is conducted, a billet is obtained, and at least three times of oxide scale removal are conducted on the casting blank in the rough rolling step; after rough rolling, finish rolling is conducted on the billet and at least three times of oxide scale removal are conducted on the casting blank in the finish rolling step. The quality of the oxide scale on the surface of the steel plate is improved through control over a oxide scale removal system in the billet rolling technology and the rolling process, the red, loose, multi-hole and smashed oxide scale is prevented from being generated on the surface of the steel plate, a green and compact oxide scale is generated, the quality of the surface of the steel plate is improved, and the corrosion-resistant performance of the surface of the steel plate is further improved.
Description
Technical field
The invention belongs to steel plate rolling technical field, be specifically related to a kind of control method of steekle mill surface of steel plate red scale.
Background technology
In recent years, along with the fast development of steel and iron industry, cut deal production capacity is discharged fast, and due to production capacity surplus, client is more and more higher to the requirement of steel plate, except requiring strictly to properties of product, also the surface quality of steel plate is proposed to high requirement.For a long time, domestic iron and steel enterprises lacks and pays close attention to plate surface quality, has caused cut deal surface to have the quality problems such as iron scale red rust, band shape and " pit ", " pitted skin ", is perplexing manufacturer always, there is no at present thorough solution.Therefore, prevent that cut deal surface from producing iron scale is one of problem of wanting in the most at present of iron and steel enterprise.The red scale (red rust) of surface of steel plate is that steekle mill is produced the recurrent a kind of defect of steel plate, and this iron scale is mainly by the FeO in Plate Production process and/or Fe
3o
4the Fe broken, oxidation transformation becomes
2o
3due to, there is loose, porous, the shortcoming such as oxidizable, and the surface of steel plate easy-to-rust after oxidation, the steel plate that makes surface produce red rust gets rusty easily in storage and In transit, affect the presentation quality of steel plate, and then have a strong impact on the market image of product, sell and bring very large puzzlement to iron and steel enterprise.According to the applicant understood, the research of iron scale at present focuses mostly on aspect band steel and common Heavy Plate Production, the research of steekle mill aspect is little, the formation that adopts physical method control iron scale in steekle mill production process more, such as high-pressure water descaling method, rolling de-scaling method and mechanical descaling method etc., the research that forms reason for red scale focuses mostly in the research of rolling temperature, chemical composition.But its scale on surface quality control of steel plate that steekle mill is produced has its particularity, the charge length that steekle mill adopts is longer, when rolling thickness is thinner, because operation of rolling passage is longer interval time, make rolling temperature of steel plate be difficult to control and the iron scale thickness of Surface Creation often thicker, the easy fragmentation of scale on surface is oxidized to Fe
2o
3thereby, produce red rust.
Summary of the invention
The technical problem to be solved in the present invention is the defect existing according to prior art, a kind of control method of steekle mill surface of steel plate red scale is proposed, can, under existing process equipment condition, eliminate by improving rolling and descaling process the red rust that steekle mill surface of steel plate produces.
The control method of steekle mill surface of steel plate red scale of the present invention, carry out according to the following steps:
(1) strand composition is C 0.06～0.25% by mass percentage, Si 0.13～0.35%, Mn 0.90～1.60%, P≤0.03%, S≤0.03%, Nb 0～0.04%, Ni 0～1%, Mo 0～0.5%, Ti 0～0.018%, Alt 0.02～0.05%, all the other are Fe and impurity;
(2) strand enters heating furnace and heats, and tapping temperature is controlled at 1150～1250 ℃, and time inside furnace is 110～170min;
(3) strand after coming out of the stove is adopted to high-pressure water descaling, de-scaling temperature is 1140～1230 ℃, and de-scaling pressure is at least 18MPa;
(4) the strand after de-scaling is carried out to roughing and obtain steel billet, when roughing, start rolling temperature is 1120～1210 ℃, and finishing temperature is 1030～1120 ℃, and accumulative total drafts is 40～80%, and rough rolling step carries out at least three de-scalings to strand;
(5) after roughing, steel billet is carried out to finish rolling, start rolling temperature is 980～1070 ℃, and finishing temperature is 880 ± 20 ℃, and accumulative total drafts is 45～85%, and mill speed is 1.5～3.5m/s, and the finish rolling stage is carried out at least three de-scalings to strand.
The present invention designs steekle mill production line, the charge length that this steekle mill uses is in general longer, compared with cut deal and hot continuous rolling etc., in steel plate rolling process, easily there is the red scale that corrosion resistance is poor, employing the present invention can be under existing technological equipment condition, eliminate by improving rolling and descaling process the red rust that steekle mill surface of steel plate produces, and technology of the present invention can be applicable to steel grade more widely, be not limited to the steel grade such as the deck of boat and low-alloy high-strength steel.
Wherein, in described step (4) and (5), for the steel plate of thickness G reatT.GreaT.GT 20mm, need carry out 4 or 6 passage roughing, 5 or 7 passage finish rolling, when finish rolling, pass deformation rate is 15～20%, finishing temperature is 885 ± 15 ℃, thick, each de-scaling three passages of finish rolling stage; For the steel plate of thickness≤20mm, need carry out 4 or 6 passage roughing, 7 or 9 passage finish rolling, when finish rolling, pass deformation rate is 13～25%, finishing temperature is 875 ± 15 ℃, thick, each de-scaling three～four-pass of finish rolling stage.
Preferably, in the time that steel plate thickness is 20mm, strand is carried out to four-pass roughing in described step in (4), wherein before previous three passes roughing, strand is carried out to de-scaling, de-scaling hydraulic pressure is at least 20MPa; (5) strand is carried out to five passage finish rolling in described step in, wherein before the first passage finish rolling and last two passage finish rolling, need strand to carry out de-scaling, de-scaling hydraulic pressure is at least 20MPa.
Preferably, for the steel plate that does not need the warm-rolling system of robbing, thickness >=14mm, the finish rolling stage adopts last three passages or last two passage de-scalings.
Find after deliberation, the formation of surface of steel plate red scale, closely related with scale removal effect in the finishing temperature of steel plate and the operation of rolling: after finish to gauge, surface of steel plate iron scale is more thick easier to be broken, and then more easily form red scale, and the finishing temperature of steel plate is lower, more easily form red scale, therefore need guarantee under the prerequisite of plate property, suitably improve the finishing temperature of steel plate, improve as much as possible the plasticity of surface of steel plate iron scale, learn through test of many times, the finishing temperature of steel plate is controlled at 880 ± 20 ℃, can make surface of steel plate be difficult for generating red scale, but generation cyan, fine and close iron scale, not only can guarantee the performance of steel plate, also improve plate surface quality, improve the competitiveness of product in market, and in steel plate rolling process, descaling process finishes more early, more easily form red scale, therefore need the de-scaling system of the operation of rolling to be optimized, guarantee as far as possible to carry out de-scaling before each passage in finish to gauge Mo San road, farthest attenuate the thickness of iron oxide on surface of billet steel skin in the operation of rolling, improve thickness and the plasticity of surface of steel plate iron scale, and then prevented the broken oxidation of surface of steel plate iron scale, produced red rust.
Further preferred, described strand red temperature in thick, finishing stands is controlled at 650 ± 30 ℃.
Further preferred again, described step (2) in strand enter heating furnace heating before employing cooling in heap mode slow cooling 48 hours.
Further preferred, described slab thickness is 150～220mm, and described steel sheet product thickness specification is 8～60mm.
The present invention improves the quality of surface of steel plate iron scale by de-scaling system in control billet rolling technique and the operation of rolling, prevent that surface of steel plate from producing comminution iron scale red, loose, porous, cyan, fine and close iron scale are generated, not only improve the quality of surface of steel plate, also improved the corrosion resistance of surface of steel plate.
The specific embodiment
Embodiment mono-
The technological process of steel plate rolling is: molten iron pretreatment → converter smelting → RH+LF (or LF+RH) refining → continuous casting → steel billet check → cooling in heap → steel billet examination → strand heating → thick de-scaling → roughing → smart de-scaling → finish rolling → laminar flow is cooling → aligning → air cooling → cutting to length (→ flaw detection) → sample (→ ball blast → normalizing heat treatment → aligning → sampling) → spray printed mark → check → warehouse-in.
First, smelting molten steel and continuous casting become steel billet, and the thickness of steel billet is at 150mm, and steel billet Composition Control exists:
| Composition | C | Si | Mn | P | S | Nb | Ni | Mo | Ti | Alt | Fe and impurity |
| Content (wt, %) | 0.16 | 0.21 | 1.44 | 0.014 | 0.003 | 0.014 | 0 | 0 | 0 | 0.035 | 98.124 |
Secondly, the steel billet of casting is carried out to cooling in heap, to reduce the hydrogen content in steel billet, reduce the internal stress producing when cooling simultaneously as far as possible, after steel billet slow cooling 48 hours, steel billet is put into heating furnace and heat, tapping temperature is controlled at 1150 ℃, time inside furnace is 110～170min, and soaking time is not less than 20min.Steel billet after coming out of the stove adopts high-pressure water descaling in thick de-scaling place, and de-scaling temperature is 1140 ℃ of left and right, and de-scaling pressure is 18MPa at least.Strand after de-scaling carries out four-pass roughing, and start rolling temperature is 1120 ℃ of left and right, and finishing temperature is 1030 ℃, and accumulative total drafts is 60% left and right, and when roughing, previous three passes need be carried out de-scaling before machine to strand, and de-scaling hydraulic pressure is 22MPa; After roughing, steel billet is carried out to five passage finish rolling, start rolling temperature is 1000 ± 15 ℃, finishing temperature is 880 ± 20 ℃, red temperature is controlled at 650 ± 30 ℃, and accumulative total drafts is 67% left and right, and mill speed is 1.5 ~ 3.5m/s, before finish rolling stage first passage and last two passage finish rolling, need strand to carry out de-scaling before machine, de-scaling hydraulic pressure is 20MPa, and finally obtaining thickness is the steel plate Q345C of 20mm, and the thickness of its surperficial cyan iron scale is 15 μ m.
Embodiment bis-
Smelting molten steel and continuous casting become steel billet, and the thickness of steel billet is at 220mm, and steel billet Composition Control exists:
| Composition | C | Si | Mn | P | S | Nb | Ni | Mo | Ti | Alt | Fe and impurity |
| Content (wt, %) | 0.25 | 0.35 | 1.6 | 0.03 | 0.02 | 0.04 | 1 | 0.5 | 0.018 | 0.05 | 96.142 |
Steel billet was carried out to cooling in heap after 48 hours, steel billet is put into heating furnace and heat, tapping temperature is controlled at 1250 ℃, and time inside furnace is 150～170min, and soaking time is 35min.Steel billet after coming out of the stove adopts high-pressure water descaling in thick de-scaling place, and de-scaling temperature is 1230 ℃ of left and right, and de-scaling pressure is 22MPa.Strand after de-scaling carries out four-pass roughing, and start rolling temperature is 1200 ℃ of left and right, and finishing temperature is 1120 ℃, accumulative total drafts 40% left and right, and when roughing, previous three passes need be carried out de-scaling before machine to strand, and de-scaling hydraulic pressure is 20MPa; After roughing, steel billet is carried out to five passage finish rolling, start rolling temperature is 1050 ± 15 ℃, finishing temperature is 900 ℃ of left and right, red temperature is controlled at 680 ℃ of left and right, drafts is 60% left and right, and mill speed is 1.5 ~ 3.5m/s, and de-scaling hydraulic pressure is 20MPa, finally obtain the steel plate that thickness is 60mm, the thickness of its surperficial cyan iron scale is 23 μ m.
Embodiment tri-
Smelting molten steel and continuous casting become steel billet, and the thickness of steel billet is at 170mm, and steel billet Composition Control exists:
| Composition | C | Si | Mn | P | S | Nb | Ni | Mo | Ti | Alt | Fe and impurity |
| Content (wt, %) | 0.06 | 0.13 | 0.9 | 0.007 | 0.03 | 0.021 | 0.5 | 0.25 | 0.009 | 0.02 | 98.073 |
Steel billet was carried out to cooling in heap after 48 hours, steel billet is put into heating furnace and heat, tapping temperature is controlled at 1200 ℃, and time inside furnace is 110～140min, and soaking time is 20min.Steel billet after coming out of the stove adopts high-pressure water descaling in thick de-scaling place, and de-scaling temperature is 1180 ℃ of left and right, and de-scaling pressure is 18MPa.Strand after de-scaling carries out four-pass roughing, and start rolling temperature is 1210 ℃ of left and right, and finishing temperature is 1100 ℃, accumulative total drafts 50% left and right, and when roughing, previous three passes need be carried out de-scaling before machine to strand, and de-scaling hydraulic pressure is 21MPa; After roughing, steel billet is carried out to five passage finish rolling, start rolling temperature is 1040 ± 15 ℃, finishing temperature is 890 ℃ of left and right, red temperature is controlled at 670 ℃ of left and right, and drafts is 45% left and right, and mill speed is 1.5 ~ 3.5m/s, end three passages in finish rolling stage need be carried out de-scaling before machine to strand, de-scaling hydraulic pressure is 19MPa, finally obtains the steel plate that thickness is 40mm, and the thickness of its surperficial cyan iron scale is 18 μ m.
Embodiment tetra-
Smelting molten steel and continuous casting become steel billet, and the thickness of steel billet is at 190mm, and steel billet Composition Control exists:
| Composition | C | Si | Mn | P | S | Nb | Ni | Mo | Ti | Alt | Fe and impurity |
| Content (wt, %) | 0.2 | 0.17 | 1.25 | 0.02 | 0.013 | 0 | 0.7 | 0.1 | 0.012 | 0.035 | 97.5 |
Steel billet is carried out, after cooling in heap, steel billet being put into heating furnace and heating, and tapping temperature is controlled at 1175 ℃, and time inside furnace is 120～140min, and soaking time is 40min.Steel billet after coming out of the stove adopts high-pressure water descaling in thick de-scaling place, and de-scaling temperature is 1160 ℃ of left and right, and de-scaling pressure is 20MPa.Strand after de-scaling carries out six passage roughing, and start rolling temperature is 1130 ℃ of left and right, accumulative total drafts 80% left and right, when roughing before four-pass need carry out de-scaling before machine to strand, de-scaling hydraulic pressure is 20MPa; After roughing, steel billet is carried out to seven passage finish rolling, start rolling temperature is 1020 ± 15 ℃, finishing temperature is 900 ℃ of left and right, red temperature is controlled at 650 ℃ of left and right, and accumulative total drafts is 85% left and right, and mill speed is 1.5 ~ 3.5m/s, first passage in finish rolling stage and last three passages need be carried out de-scaling before machine to rolled piece, de-scaling hydraulic pressure is 21MPa, finally obtains the steel plate that thickness is 10mm, and the thickness of its surperficial cyan iron scale is 11 μ m.
In the present invention, for the thicker steel plate of thickness, guaranteeing under the prerequisite of plate property, optimizing rolling procedure design, for example, suitably improving pass deformation rate, reducing rolling pass etc., and suitably improve finishing temperature, to improve iron scale plasticity.For not needing the warm-rolling system of robbing, steel plate that thickness is thicker, except normal de-scaling in intermediate rolling process, also need de-scaling before each passage in finish to gauge Mo San road.But, when temperature control at need, at least should guarantee de-scaling before each passage of last two passages of finish to gauge.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (7)
1. a control method for steekle mill surface of steel plate red scale, is characterized in that, carries out according to the following steps:
(1) strand composition is C 0.06～0.25% by mass percentage, Si 0.13～0.35%, Mn 0.90～1.60%, P≤0.03%, S≤0.03%, Nb 0～0.04%, Ni 0～1%, Mo 0～0.5%, Ti 0～0.018%, Alt 0.02～0.05%, all the other are Fe and impurity;
(2) strand enters heating furnace and heats, and tapping temperature is controlled at 1150～1250 ℃, and time inside furnace is 110～170min;
(3) strand after coming out of the stove is adopted to high-pressure water descaling, de-scaling temperature is 1140～1230 ℃, and de-scaling pressure is at least 18MPa;
(4) the strand after de-scaling is carried out to roughing and obtain steel billet, when roughing, start rolling temperature is 1120～1210 ℃, and finishing temperature is 1030～1120 ℃, and drafts is 40～80%, and rough rolling step carries out at least three de-scalings to strand;
(5) after roughing, steel billet is carried out to finish rolling, start rolling temperature is 980～1070 ℃, and finishing temperature is 880 ± 20 ℃, and drafts is 45～85%, and mill speed is 1.5～3.5m/s, and the finish rolling stage is carried out at least three de-scalings to strand.
2. the control method of steekle mill surface of steel plate red scale as claimed in claim 1, it is characterized in that: in described step (4) and (5), for the steel plate of thickness G reatT.GreaT.GT 20mm, need carry out 4 or 6 passage roughing, 5 or 7 passage finish rolling, when finish rolling, pass deformation rate is 15～20%, and finishing temperature is 885 ± 15 ℃, thick, each de-scaling three passages of finish rolling stage; For the steel plate of thickness≤20mm, need carry out 4 or 6 passage roughing, 7 or 9 passage finish rolling, when finish rolling, pass deformation rate is 13～25%, finishing temperature is 875 ± 15 ℃, thick, each de-scaling three～four-pass of finish rolling stage.
3. the control method of steekle mill surface of steel plate red scale as claimed in claim 2, it is characterized in that: in the time that steel plate thickness is 20mm, (4) strand is carried out to four-pass roughing in described step in, wherein before previous three passes roughing, strand is carried out to de-scaling, de-scaling hydraulic pressure is at least 20MPa; (5) strand is carried out to five passage finish rolling in described step in, wherein before the first passage finish rolling and last two passage finish rolling, need strand to carry out de-scaling, de-scaling hydraulic pressure is at least 20MPa.
4. the control method of steekle mill surface of steel plate red scale as claimed in claim 3, is characterized in that: for the steel plate that does not need the warm-rolling system of robbing, thickness >=14mm, the finish rolling stage adopts last three passages or last two passage de-scalings.
5. the control method of steekle mill surface of steel plate red scale as claimed in claim 1, is characterized in that: described strand red temperature in thick, finishing stands is controlled at 650 ± 30 ℃.
6. the control method of steekle mill surface of steel plate red scale as claimed in claim 1, is characterized in that: described step (2) in strand adopt cooling in heap mode slow cooling 48 hours before entering heating furnace heating.
7. the control method of steekle mill surface of steel plate red scale as claimed in claim 1, is characterized in that: described slab thickness is 150～220mm, described steel sheet product thickness specification is 8～60mm.
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