CN103962386B - The corrosion proof iron scale control method of a kind of raising hot rolled steel plate - Google Patents

The corrosion proof iron scale control method of a kind of raising hot rolled steel plate Download PDF

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CN103962386B
CN103962386B CN201410159209.2A CN201410159209A CN103962386B CN 103962386 B CN103962386 B CN 103962386B CN 201410159209 A CN201410159209 A CN 201410159209A CN 103962386 B CN103962386 B CN 103962386B
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scaling
scale
thick
steel plate
finish rolling
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CN103962386A (en
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曹光明
刘振宇
刘小江
孙彬
杨名
何永全
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Northeastern University China
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Abstract

The invention provides the corrosion proof iron scale control method of a kind of raising hot rolled steel plate, belong to metallurgical technology field.Control method of the present invention comprises the steps: that smelting molten steel continuous casting becomes slab, by de-scaling thick after heating of plate blank isothermal holding, thick de-scaling pressure is more than or equal to 16MPa, the thick de-scaling time is 4 ~ 10s, carries out the finish rolling stage after smart roughing, before the odd-numbered pass finish rolling stage, carry out smart de-scaling, essence de-scaling pressure is more than or equal to 16MPa, the essence de-scaling time is 4 ~ 10s, and after finish rolling, upper cold bed is cooled to room temperature with the speed of 10 ~ 25 DEG C/s.The present invention is directed to hot rolled steel plate scale structure and propose hot rolling technology Adjusted Option, in control, cold bed cooling speed reaches the conservative control of scale structure by the eutectoid reaction degree of control FeO, thus improve the corrosion resistance of surface of hot rolled steel plate, the present invention utilizes the existing equipment and process condition of steel mill, neither increase investment and production cost, its corrosion resistance is improved on the basis of the mechanical property of guarantee hot rolled steel plate.

Description

The corrosion proof iron scale control method of a kind of raising hot rolled steel plate
Technical field
The invention belongs to metallurgical technology field, particularly one improves the corrosion proof iron scale control method of hot rolled steel plate.
Background technology
Cut deal product is the product class that in hot rolling series products, proportion is larger, generally sells as finished product.The cut deal of most directly supply of material does not have external packing, because the atmospheric corrosion of environment and bale packing intakes and is detained the Local electrochemical crevice corrosion that causes and makes the surperficial generation corrosion of cut deal plate or present serious " pockmark " shape erosion profile in transport and storing process, thus the objection of initiation user quality.At present, the measure promoted for steel corrosion resisting property is more, but focus mostly at alloying elements such as interpolation Cr, Ni, Cu, the anticorrosion layer of one deck densification is formed at steel surface, or directly adopt and carry out japanning and coating measure to improve the decay resistance of steel at steel surface, but above-mentioned measure is based upon on the basis of increase equipment investment, raising alloy dosage, increase production cost, and environment is destroyed to some extent, this and current Iron & Steel Development direction (energy-conservation, reduce discharging, lower consumption) runs in the opposite direction.
Consider in Hot Rolling Process For High Temperature Alloy Plate process and in the cold process of control afterwards, the iron scale that surface meeting self-assembling formation one deck is thin.This layer of iron scale, in the preservation of follow-up steel, can play fabulous protective action in transportation.By changing the growth mechanism of oxide skin in Hot Rolling Process For High Temperature Alloy Plate process, generating and being conducive to anti-corrosion oxide skin structure, improving the compactness of oxide skin simultaneously, improve its protectiveness.A lot of about the research of surface of steel plate iron scale at present, but which kind of scale structure decay resistance preferably not yet there is research for how controlling four iron scales with, China Patent No. 200710010183.5 " medium thin slab continuous casting and rolling belt steel surface iron scale control method " gives the control method of iron scale comprising Composition Design, descaling process, rolling and process for cooling for medium thin slab hot-strip, mainly for be medium thin slab short-flow production line, what mainly solve is how to remove belt steel surface red rust.Japan and the research work of other countries in iron scale control mainly concentrate in the blemish such as scale structure analysis and iron scale press-in, and to how, controlled oxidization iron sheet structure improves cut deal corrosion resisting property does not have and relate to.
Given this, the present invention is evaluated as foundation with different structure iron scale decay resistance in Plate Production Process, obtain the scale structure type of decay resistance optimum, propose by optimizing Composition Design, ensureing de-scaling pressure, cooling velocity on conservative control after cold bed obtains optimum corrosion proof scale structure, thus reaches the object improving cut deal product corrosion resisting property.At present, control method of the present invention has been applied in the production of cut deal, and anticorrosion effect is good.
Summary of the invention
For the deficiencies in the prior art, the invention provides the corrosion proof iron scale control method of a kind of raising hot rolled steel plate, by optimizing steel grades, ensure de-scaling pressure, adjustment hot rolling technology scheme, cooling velocity on conservative control after cold bed, be reached through the eutectoid reaction degree of control FeO to obtain the best scale structure type of corrosion resistance, thus its corrosion resisting property is improved on the basis of mechanical property ensureing hot rolled steel plate product, this control method is a kind of without the need to increasing equipment and investment, do not increase production cost, make full use of the effective ways of existing equipment and process flow process.
The corrosion proof iron scale control method of raising hot rolled steel plate of the present invention, comprises the following steps:
Step one: smelting molten steel continuous casting becomes slab, slab composition is C:0.05 ~ 0.2% by weight percentage, Si:0.11 ~ 0.4%, Mn:1.0 ~ 1.2%, P :≤0.02%, S :≤0.02%, Al:0.01 ~ 0.05%, Nb:0.01 ~ 0.05%, V :≤0.05%, surplus is Fe;
Step 2: by heating of plate blank to 1150 ~ 1250 DEG C, heat time 200 ~ 300min; Then with the thick de-scaling of water under high pressure, thick de-scaling temperature is 1100 ~ 1200 DEG C, and thick de-scaling hydraulic pressure is more than or equal to 16MPa, and the thick de-scaling time is 4 ~ 10s, makes surface of steel plate non-oxidation iron sheet and covering slag, reaches noresidue;
Step 3: the slab after thick de-scaling enters rough rolling step, and start rolling temperature is 1100 ~ 1150 DEG C, and finishing temperature is 1000 ~ 1150 DEG C, and accumulative drafts is 70 ~ 85%;
Step 4: the slab after roughing enters the finish rolling stage, before the odd-numbered pass finish rolling stage, carries out smart de-scaling, and smart squama hydraulic pressure is more than or equal to 16MPa, and the smart de-scaling time is 4 ~ 10s; The finish rolling stage, finishing temperature control was at 840 ~ 970 DEG C, and accumulative drafts is 50 ~ 80%, and throwing steel speed after finish rolling is 1.2 ~ 2m/s;
Step 5: finish rolling terminates rear upper cold bed and is cooled to room temperature with the speed of 10 ~ 25 DEG C/s, has reached and has reduced scale on surface generation eutectoid reaction degree.
The thickness of the hot rolled steel plate scale on surface that said method obtains is 15 ~ 30 μm, the press-in of non-oxidation iron sheet and Fragmentation Phenomena in the operation of rolling, by the detection method of " a kind of chemical attack detects the method for hot rolling strip steel scale structure " patent of China Patent No. ZL201010010116.5, in the hot rolled steel plate scale on surface obtained, the content of FeO is 40 ~ 70%, and eutectoid structure content is less than 20%.
Outstanding feature of the present invention and significant effect are mainly reflected in:
(1) the present invention obtains the scale structure type of optimum decay resistance by the corrosion-resistant appraisement system of the iron scale of different types of structure, and for the content of FeO middle in scale structure is 40 ~ 70%, eutectoid structure content is less than 20%.
(2) the present invention proposes mode of heating and de-scaling requirement; the raw iron scale thickness of stove in Plate Production Process can be controlled; be conducive to slab go out heating furnace after de-scaling, make strand through the raw iron scale of thick de-scaling rear surface noresidue stove and covering slag.
(3) the present invention proposes rolling mill practice and follow-up upper cold bed cooldown rate control method, ensure that the press-in of non-oxidation iron sheet and Fragmentation Phenomena in Plate Production Process, improve the compactness of cut deal scale on surface, the optimum corrosion resistance scale structure simultaneously generated ensure that the corrosion resisting property of cut deal product.
(4) the present invention utilizes steel mill's existing equipment and process conditions, does not increase alloy addition level also without follow-up coating process, is not increasing investment and production cost, ensures surface quality and the decay resistance of cut deal product.
Accompanying drawing explanation
Fig. 1 tetra-kinds of typical oxidation iron sheet structure types, wherein: (a) is TypeI, (b) is TypeII, and (c) is TypeIII, and (d) is TypeIV;
Fig. 2 embodiment of the present invention 1 scale structure figure;
Fig. 3 embodiment of the present invention 2 scale structure figure;
Fig. 4 embodiment of the present invention 3 scale structure figure;
Fig. 5 embodiment of the present invention 4 scale structure figure.
Detailed description of the invention
Embodiment 1
Step one: smelting molten steel continuous casting becomes slab, slab composition is C:0.11%, Si:0.15%, Mn:1.05%, P:0.007%, S:0.004%, Al:0.012%, Nb:0.034%, V:0.04% by weight percentage, and surplus is iron;
Step 2: by heating of plate blank to 1250 DEG C, heat time 210min; Then with the thick de-scaling of water under high pressure, thick de-scaling temperature is 1200 DEG C, and thick de-scaling hydraulic pressure is 16MPa, and the thick de-scaling time is 5s, makes surface of steel plate non-oxidation iron sheet and covering slag, reaches noresidue;
Step 3: the slab after thick de-scaling enters rough rolling step, and start rolling temperature is 1150 DEG C, and finishing temperature is 1120 DEG C, and accumulative drafts is 85%;
Step 4: the slab after roughing enters the finish rolling stage, before the odd-numbered pass finish rolling stage, carries out smart de-scaling, and smart de-scaling hydraulic pressure is 18MPa, and the smart de-scaling time is 6s, is total to smart de-scaling 3 times in this finish rolling stage; The finish rolling stage, finishing temperature control was at 970 DEG C, and accumulative drafts is 55%, and throwing steel speed after finish rolling is 2m/s;
Step 5: finish rolling terminates rear upper cold bed and is cooled to room temperature with the speed of 10 DEG C/s, by the detection method of " a kind of chemical attack detects the method for hot rolling strip steel scale structure " patent of patent No. ZL201010010116.5, in the hot rolled steel plate scale structure obtained, the content of FeO is 40%, eutectoid structure content 10%.
Fig. 1 is four kinds of typical oxidation iron sheet structure types, wherein:
The iron scale of TypeI is by Fe 3o 4, eutectoid product (Fe 3o 4+ Fe) and a small amount of residual FeO formation, wherein the eutectoid reaction amount of FeO is more than 70%;
The iron scale of TypeII is by Fe 3o 4, eutectoid reaction product (Fe 3o 4+ Fe) and a small amount of residual FeO formation, wherein the eutectoid reaction amount of FeO is less than 50%;
The iron scale of TypeIII is by Fe 3o 4, residual FeO and pro-eutectoid Fe 3o 4form, in whole iron sheet layer, have few eutectoid reaction;
The iron scale of TypeIV is by Fe 3o 4form with FeO layer, in FeO layer, any transformation does not occur.
It is still bright that the surface after month placed by the present embodiment cut deal, and surface quality is good, and the fine and close zero defect of iron scale, scale structure figure, is shown in Fig. 2, composition graphs 1, and the present embodiment scale structure is TypeIII, and decay resistance is good.
Embodiment 2
Step one: smelting molten steel continuous casting becomes slab, slab composition is C:0.09%, Si:0.35%, Mn:1.18%, P:0.006%, S:0.002%, Al:0.023%, Nb:0.04%, V:0.036% by weight percentage, and surplus is iron;
Step 2: by heating of plate blank to 1150 DEG C, heat time 300min; Then with the thick de-scaling of water under high pressure, thick de-scaling temperature is 1100 DEG C, and thick de-scaling hydraulic pressure is 18MPa, and the thick de-scaling time is 6s, makes surface of steel plate non-oxidation iron sheet and covering slag, reaches noresidue;
Step 3: the slab after thick de-scaling enters rough rolling step, and start rolling temperature is 1100 DEG C, and finishing temperature is 1000 DEG C, and accumulative drafts is 70%;
Step 4: the slab after roughing enters the finish rolling stage, before the odd-numbered pass finish rolling stage, carries out smart de-scaling, and smart de-scaling hydraulic pressure is 20MPa, and the smart de-scaling time is 5s, is total to smart de-scaling 2 times in this finish rolling stage; The finish rolling stage, finishing temperature control was at 840 DEG C, and accumulative drafts is 80%, and throwing steel speed after finish rolling is 2m/s;
Step 5: finish rolling terminates rear upper cold bed and is cooled to room temperature with the speed of 25 DEG C/s, by the detection method of " a kind of chemical attack detects the method for hot rolling strip steel scale structure " patent of patent No. ZL201010010116.5, in the hot rolled steel plate scale on surface obtained, the content of FeO is 70%, eutectoid structure content 5%.
It is still bright that the surface after month placed by the present embodiment cut deal, and surface quality is good, and the fine and close zero defect of iron scale, scale structure figure, is shown in Fig. 3, composition graphs 1, and the present embodiment scale structure is TypeIII, and decay resistance is good.
Embodiment 3
Step one: smelting molten steel continuous casting becomes slab, slab composition is C:0.07%, Si:0.24%, Mn:1.2%, P:0.008%, S:0.004%, Al:0.04%, Nb:0.034%, V:0.038% by weight percentage, and surplus is iron;
Step 2: by heating of plate blank to 1220 DEG C, heat time 260min; Then with the thick de-scaling of water under high pressure, thick de-scaling temperature is 1180 DEG C, and thick de-scaling hydraulic pressure is 16MPa, and the thick de-scaling time is 5s, makes surface of steel plate non-oxidation iron sheet and covering slag, reaches noresidue;
Step 3: the slab after thick de-scaling enters rough rolling step, and start rolling temperature is 1130 DEG C, and finishing temperature is 1110 DEG C, and accumulative drafts is 78%;
Step 4: the slab after roughing enters the finish rolling stage, before the odd-numbered pass finish rolling stage, carries out smart de-scaling, and smart de-scaling hydraulic pressure is 20MPa, and the smart de-scaling time is 4s, is total to smart de-scaling 3 times in this finish rolling stage; The finish rolling stage, finishing temperature control was at 940 DEG C, and accumulative drafts is 76%, and throwing steel speed after finish rolling is 1.8m/s;
Step 5: finish rolling terminates rear upper cold bed and is cooled to room temperature with the speed of 22 DEG C/s, by the detection method of " a kind of chemical attack detects the method for hot rolling strip steel scale structure " patent of patent No. ZL201010010116.5, in the hot rolled steel plate scale on surface obtained, the content of FeO is 65%, eutectoid structure content 7%.
It is still bright that the surface after month placed by the present embodiment cut deal, and surface quality is good, and the fine and close zero defect of iron scale, scale structure figure, is shown in Fig. 4, composition graphs 1, and the present embodiment scale structure is TypeIII, and decay resistance is good.
Embodiment 4
Step one: smelting molten steel continuous casting becomes slab, slab composition is C:0.12%, Si:0.3%, Mn:1.07%, P:0.004%, S:0.004%, Al:0.042%, Nb:0.028%, V:0.034% by weight percentage, surplus is iron;
Step 2: by heating of plate blank to 1190 DEG C, heat time 280min; Then with the thick de-scaling of water under high pressure, thick de-scaling temperature is 1150 DEG C, and thick de-scaling hydraulic pressure is 16MPa, and the thick de-scaling time is 10s, makes surface of steel plate non-oxidation iron sheet and covering slag, reaches noresidue;
Step 3: the slab after thick de-scaling enters rough rolling step, and start rolling temperature is 1130 DEG C, and finishing temperature is 1080 DEG C, and accumulative drafts is 75%;
Step 4: the slab after roughing enters the finish rolling stage, before the odd-numbered pass finish rolling stage, carries out smart de-scaling, and smart de-scaling hydraulic pressure is 18MPa, and the smart de-scaling time is 7s, is total to smart de-scaling 2 times in this finish rolling stage; The finish rolling stage, finishing temperature control was at 890 DEG C, and accumulative drafts is 70%, and throwing steel speed after finish rolling is 1.6m/s;
Step 5: finish rolling terminates rear upper cold bed and is cooled to room temperature with the speed of 18 DEG C/s, by the detection method of " a kind of chemical attack detects the method for hot rolling strip steel scale structure " patent of patent No. ZL201010010116.5, in the hot rolled steel plate scale on surface obtained, the content of FeO is 62%, eutectoid structure content 9%.
It is still bright that the surface after month placed by the present embodiment cut deal, and surface quality is good, and the fine and close zero defect of iron scale, scale structure figure, is shown in Fig. 5, composition graphs 1, and the present embodiment scale structure is TypeIII, and decay resistance is good.

Claims (1)

1. improve the corrosion proof iron scale control method of hot rolled steel plate, it is characterized in that, comprise the following steps:
Step one: smelting molten steel continuous casting becomes slab, slab composition is C:0.05 ~ 0.2% by weight percentage, Si:0.11 ~ 0.4%, Mn:1.0 ~ 1.2%, P :≤0.02%, S :≤0.02%, Al:0.01 ~ 0.05%, Nb:0.01 ~ 0.05%, V :≤0.05%, surplus is Fe;
Step 2: by heating of plate blank to 1150 ~ 1250 DEG C, heat time 200 ~ 300min; Then with the thick de-scaling of water under high pressure, thick de-scaling temperature is 1100 ~ 1200 DEG C, and thick de-scaling hydraulic pressure is more than or equal to 16MPa, and the thick de-scaling time is 4 ~ 10s, makes surface of steel plate non-oxidation iron sheet and covering slag, reaches noresidue;
Step 3: the slab after thick de-scaling enters rough rolling step, and start rolling temperature is 1100 ~ 1150 DEG C, and finishing temperature is 1000 ~ 1150 DEG C, and accumulative drafts is 70 ~ 85%;
Step 4: the slab after roughing enters the finish rolling stage, before the odd-numbered pass finish rolling stage, carries out smart de-scaling, and smart de-scaling hydraulic pressure is more than or equal to 16MPa, and the smart de-scaling time is 4 ~ 10s; The finish rolling stage, finishing temperature control was at 840 ~ 970 DEG C, and accumulative drafts is 50 ~ 80%, and throwing steel speed after finish rolling is 1.2 ~ 2m/s;
Step 5: finish rolling terminates rear upper cold bed and is cooled to room temperature with the speed of 10 ~ 25 DEG C/s, reduces scale on surface generation eutectoid reaction degree to reach;
The thickness of obtained hot rolled steel plate scale on surface is 15 ~ 30 μm, and in scale on surface, the content of FeO is 40 ~ 70%, and eutectoid structure content is less than 20%.
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