CN103962386A - Oxide scale control method for improving corrosion resistance of hot rolled medium plate - Google Patents
Oxide scale control method for improving corrosion resistance of hot rolled medium plate Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005260 corrosion Methods 0.000 title claims abstract description 24
- 230000007797 corrosion Effects 0.000 title claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 54
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 93
- 229910052742 iron Inorganic materials 0.000 claims description 41
- 239000000203 mixture Substances 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 8
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- 229910052720 vanadium Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 18
- 238000005098 hot rolling Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000001816 cooling Methods 0.000 abstract description 6
- 238000005266 casting Methods 0.000 abstract 1
- 238000005272 metallurgy Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 9
- 238000001514 detection method Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
本发明提供了一种提高热轧中厚板耐蚀性的氧化铁皮控制方法，属于冶金技术领域。本发明控制方法包括如下步骤：冶炼钢水连铸成板坯，将板坯加热保温处理后粗除鳞，粗除鳞压力大于等于16MPa，粗除鳞时间为4～10s，精粗轧后进行精轧阶段，在奇数道次精轧阶段前进行精除鳞，精除鳞压力大于等于16MPa，精除鳞时间为4～10s，精轧后，上冷床以10～25℃/s的速度冷却至室温。本发明针对热轧中厚板氧化铁皮结构提出了热轧工艺调整方案，控制上冷床冷却速通过控制FeO的共析反应程度来达到氧化铁皮结构的合理控制，从而提高热轧中厚板的表面耐蚀性，本发明利用钢厂现有的设备和工艺条件，既不增加投资和生产成本，保证热轧中厚板的力学性能的基础上提高其耐蚀性。The invention provides a method for controlling iron oxide scale for improving the corrosion resistance of hot-rolled medium and thick plates, which belongs to the technical field of metallurgy. The control method of the present invention includes the following steps: smelting molten steel and continuously casting it into slabs, heating and heat-insulating the slabs, and then performing rough descaling, the pressure of the rough descaling is greater than or equal to 16MPa, the time of the rough descaling is 4-10s, and finishing and rough rolling are carried out. In the rolling stage, fine descaling is carried out before the odd-numbered pass finishing rolling stage. The finishing descaling pressure is greater than or equal to 16MPa, and the finishing descaling time is 4-10s. After finishing rolling, the upper cooling bed is cooled at a rate of 10-25°C/s to room temperature. The present invention proposes a hot-rolling process adjustment scheme for the scale structure of hot-rolled medium-thick plates, and controls the cooling rate of the upper cooling bed to achieve reasonable control of the scale structure by controlling the eutectoid reaction degree of FeO, thereby improving the quality of hot-rolled medium-thick plates Surface corrosion resistance, the present invention utilizes the existing equipment and process conditions of the steel mill, without increasing investment and production costs, and improves the corrosion resistance on the basis of ensuring the mechanical properties of the hot-rolled medium-thick plate.
Description
Technical field
The invention belongs to metallurgical technology field, particularly a kind of corrosion proof iron scale control method of hot rolled steel plate that improves.
Background technology
Cut deal product is the product class that in hot rolling series products, proportion is larger, generally sells as finished product.Most directly cut deals of the supply of material do not have external packing, in transport and storing process because the atmospheric corrosion of environment and bale packing intakes and are detained the local electrochemistry crevice corrosion causing and make the surperficial generation corrosion of cut deal plate or present serious " pockmark " shape erosion profile, thereby the objection of initiation user quality.At present, the measure promoting for steel corrosion resisting property is more, adding the alloying elements such as Cr, Ni, Cu but focus mostly on, form the anticorrosion layer of one deck densification at steel surface, or directly adopt at steel surface and paint with coating measure to improve the decay resistance of steel, but above-mentioned measure is to be based upon on the basis that increases equipment investment, raising alloy consumption, increase production cost, and environment is destroyed to some extent, this runs in the opposite direction with current Iron & Steel Development direction (energy-conservation, reduce discharging, consumption reduction).
Consider in Hot Rolling Process For High Temperature Alloy Plate process and after the cold process of control in, surface can the thin iron scale of self-assembling formation one deck.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, generate and be conducive to anti-corrosion oxide skin structure, improve 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 " has provided the control method of the iron scale including 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, mainly solve be how to remove belt steel surface red rust.Japan and other countries mainly concentrate in the blemish such as scale structure analysis and iron scale are pressed in the research work aspect iron scale control, to how controlling scale structure improve cut deal corrosion resisting property and do 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, the cooling velocity of rationally controlling after upper cold bed obtains optimum corrosion proof scale structure, thereby reaches the object that improves 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 a kind of corrosion proof iron scale control method of hot rolled steel plate that improves, by optimizing steel grades, ensure de-scaling pressure, adjust hot rolling technology scheme, rationally control the cooling velocity after upper cold bed, the eutectoid reaction degree reaching by controlling FeO obtains the best scale structure type of corrosion resistance, thereby improve its corrosion resisting property on the basis of mechanical property that ensures hot rolled steel plate product, this control method is a kind of without increase 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 1: 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, accumulative total 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; Finish rolling stage finishing temperature is controlled at 840～970 DEG C, and accumulative total drafts is 50～80%, and after finish rolling, throwing steel speed is 1.2～2m/s;
Step 5: finish rolling finishes 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 μ m, in the operation of rolling, non-oxidation iron sheet is pressed into and Fragmentation Phenomena, the detection method of " a kind of chemical attack detects the method for the hot rolling strip steel scale structure " patent by China Patent No. ZL201010010116.5, in the hot rolled steel plate scale on surface obtaining, 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 iron scale of different types of structure, and for the content of middle FeO 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; can control the raw iron scale thickness of stove in Plate Production Process; be conducive to slab and go out the de-scaling after heating furnace, 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 in Plate Production Process, non-oxidation iron sheet is pressed into and Fragmentation Phenomena, improved the compactness of cut deal scale on surface, the optimum corrosion resistance scale structure simultaneously generating has ensured 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.
Brief description of the drawings
Tetra-kinds of typical scale structure types of Fig. 1, wherein: (a) being TypeI, is (b) TypeII, is (c) TypeIII, is (d) 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 1: smelting molten steel continuous casting becomes slab, slab composition is C:0.11% by weight percentage, Si:0.15%, Mn:1.05%, P:0.007%, S:0.004%, Al:0.012%, Nb:0.034%, V:0.04%, 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, accumulative total 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; Finish rolling stage finishing temperature is controlled at 970 DEG C, and accumulative total drafts is 55%, and after finish rolling, throwing steel speed is 2m/s;
Step 5: finish rolling finishes rear upper cold bed and is cooled to room temperature with the speed of 10 DEG C/s, the detection method of " a kind of chemical attack detects the method for the hot rolling strip steel scale structure " patent by patent No. ZL201010010116.5, in the hot rolled steel plate scale structure obtaining, the content of FeO is 40%, eutectoid structure content 10%.
Fig. 1 is four kinds of typical scale 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 exceedes 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, any transformation does not occur in FeO layer.
The present embodiment cut deal is placed the still light of surface after month, and surface quality is good, the fine and close zero defect of iron scale, and scale structure figure, is shown in Fig. 2, and in conjunction with Fig. 1, the present embodiment scale structure is TypeIII, and decay resistance is good.
Embodiment 2
Step 1: smelting molten steel continuous casting becomes slab, slab composition is C:0.09% by weight percentage, Si:0.35%, Mn:1.18%, P:0.006%, S:0.002%, Al:0.023%, Nb:0.04%, V:0.036%, 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, accumulative total 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; Finish rolling stage finishing temperature is controlled at 840 DEG C, and accumulative total drafts is 80%, and after finish rolling, throwing steel speed is 2m/s;
Step 5: finish rolling finishes rear upper cold bed and is cooled to room temperature with the speed of 25 DEG C/s, the detection method of " a kind of chemical attack detects the method for the hot rolling strip steel scale structure " patent by patent No. ZL201010010116.5, in the hot rolled steel plate scale on surface obtaining, the content of FeO is 70%, eutectoid structure content 5%.
The present embodiment cut deal is placed the still light of surface after month, and surface quality is good, the fine and close zero defect of iron scale, and scale structure figure, is shown in Fig. 3, and in conjunction with Fig. 1, the present embodiment scale structure is TypeIII, and decay resistance is good.
Embodiment 3
Step 1: smelting molten steel continuous casting becomes slab, slab composition is C:0.07% by weight percentage, Si:0.24%, Mn:1.2%, P:0.008%, S:0.004%, Al:0.04%, Nb:0.034%, V:0.038%, 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, accumulative total 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; Finish rolling stage finishing temperature is controlled at 940 DEG C, and accumulative total drafts is 76%, and after finish rolling, throwing steel speed is 1.8m/s;
Step 5: finish rolling finishes rear upper cold bed and is cooled to room temperature with the speed of 22 DEG C/s, the detection method of " a kind of chemical attack detects the method for the hot rolling strip steel scale structure " patent by patent No. ZL201010010116.5, in the hot rolled steel plate scale on surface obtaining, the content of FeO is 65%, eutectoid structure content 7%.
The present embodiment cut deal is placed the still light of surface after month, and surface quality is good, the fine and close zero defect of iron scale, and scale structure figure, is shown in Fig. 4, and in conjunction with Fig. 1, the present embodiment scale structure is TypeIII, and decay resistance is good.
Embodiment 4
Step 1: smelting molten steel continuous casting becomes slab, slab composition is C:0.12% by weight percentage, Si:0.3%, Mn:1.07%, P:0.004%, S:0.004%, Al:0.042%, Nb:0.028%, V:0.034%, surplus are 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, accumulative total 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; Finish rolling stage finishing temperature is controlled at 890 DEG C, and accumulative total drafts is 70%, and after finish rolling, throwing steel speed is 1.6m/s;
Step 5: finish rolling finishes rear upper cold bed and is cooled to room temperature with the speed of 18 DEG C/s, the detection method of " a kind of chemical attack detects the method for the hot rolling strip steel scale structure " patent by patent No. ZL201010010116.5, in the hot rolled steel plate scale on surface obtaining, the content of FeO is 62%, eutectoid structure content 9%.
The present embodiment cut deal is placed the still light of surface after month, and surface quality is good, the fine and close zero defect of iron scale, and scale structure figure, is shown in Fig. 5, and in conjunction with Fig. 1, the present embodiment scale structure is TypeIII, and decay resistance is good.
Claims (3)
1. improve the corrosion proof iron scale control method of hot rolled steel plate, it is characterized in that, comprise the following steps:
Step 1: 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, accumulative total 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; Finish rolling stage finishing temperature is controlled at 840～970 DEG C, and accumulative total drafts is 50～80%, and after finish rolling, throwing steel speed is 1.2～2m/s;
Step 5: finish rolling finishes 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.
2. the corrosion proof iron scale control method of raising hot rolled steel plate according to claim 1, is characterized in that, the thickness of prepared hot rolled steel plate scale on surface is 15～30 μ m.
3. the corrosion proof iron scale control method of raising hot rolled steel plate according to claim 1, is characterized in that, in prepared hot rolled steel plate scale on surface, the content of FeO is 40～70%, and eutectoid structure content is less than 20%.
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