CN101947557B - Preparation method for reducing scales generated on surfaces of hot-rolled steel plates - Google Patents
Preparation method for reducing scales generated on surfaces of hot-rolled steel plates Download PDFInfo
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- CN101947557B CN101947557B CN 201010264032 CN201010264032A CN101947557B CN 101947557 B CN101947557 B CN 101947557B CN 201010264032 CN201010264032 CN 201010264032 CN 201010264032 A CN201010264032 A CN 201010264032A CN 101947557 B CN101947557 B CN 101947557B
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Abstract
The invention belongs to the technical field of hot-rolled strips and relates to a method for controlling the surface quality of hot-rolled steel plates, namely a preparation method for reducing scales generated on the surfaces of the hot-rolled steel plates. The chemical components of the steel in the method have wider application range and are especially suitable for the hot-rolled steel plates containing such microalloying elements as Nb, V, Mn and Si. The hot-rolled steel plates have the following chemical components by weight: not less than 0.05% and not more than 0.20% of C, not more than 0.70% of Si, not less than 0.20% and not more than 2.00% of Mn, not less than 0.02% and not more than 0.10% of Nb, not less than 0.03% and not more than 0.15% of V, not more than 0.12% of Ti, not more than 0.040% of P, not more than 0.030% of S and the balance Fe and inevitable impurities. The control method dispenses with improvement of existing equipment, is simple and controllable in process conditions, realizes the aim of reducing the scales by controlling the slab tapping temperature, the finish rolling, initial rolling and final rolling temperature, the coiling temperature and the cooling method and has the advantages of low energy consumption, low cost and wide applicable scope.
Description
Technical field
The invention belongs to hot continuous rolling strip technical field, relate to a kind of hot rolled steel plate Methods of Surface Quality Control, namely reduce the preparation method of scales generated on surfaces of hot-rolled steel plates, the scope of application of the method steel grade chemical composition is wider, is particularly useful for containing the hot rolled steel plate of Nb, V, Mn and Si microalloy element.
Background technology
Hot rolled steel plate is mainly used in making constitutional detail, such as parts such as engineering machinery, steel construction, automobile frame, compartments, intensity, toughness, plasticity to steel plate are had relatively high expectations, and its tensile strength scope is between 370～700MPa, and the microalloying mode of its steel grade is more.At present, domestic iron and steel enterprises is according to separately resources characteristic and technological equipment condition, usually adopts V, Ti, Nb as the microalloying element car hot rolled steel plate that steams next life, all has to some extent the red scale phenomenon on the finished steel plate surface.For a long time, in user's use procedure, because red scale does not affect mechanical property and the processing performance of hot rolled steel plate, thereby obtain user's generally approval.In recent years, because the requirement to the hot rolled steel plate surface quality is more and more harsher, and automobile frame (such as crossbeam, longeron) has become appearance part by original inner part, especially it is more strict to the surface quality requirement of vehicle beam and longeron to export vehicle, and vehicle structure then becomes one of key factor of quality evaluation with the red scale that hot rolled steel plate occurs.
According to studies show that, red scale essence is the comparatively fine and close iron scale that is difficult to remove of a kind of structure, and it produces relevant with factors such as steel grade chemical composition, the control of rolling mill practice process temperature and band steel cooling procedures.
At present, both at home and abroad for removing red scale, or the report of controlling its generation is more, and " the making the method and apparatus (CN 01805403.X) of hot rolled strip " of carrying female invention such as Lee of Korea S Pohang Iron and Steel Corporation provides a kind of effective ways and device of mechanically removing high temperature hot rolled strip scale on surface; " method for cleaning of surface of steel plate and cleaning plant (CN 95190817.0) " of the inventions such as Kawasaki, Japan iron processed Shimizu K. K. benefit people are by being optimized to the nozzle injection pressure of descaling device, flow and with the normal angle of surface of steel plate, and scale removal effect is better; " the quick-fried method of water is except the hot rolling steel billet scale on surface technique (CN 85108549) " of Taiyuan Iron and Steel Co., Shanxi Prov invention with water as medium, the quick-fried method of water is removed the hot rolling steel billet scale on surface, and this technique is applicable to the surface removal iron scale of high-temperature hot-rolled steel billet and finished steel; The continuous casting billet lower surface is swept in the press water spray that " continuous casting blank scale eliminating device (CN 03269581.0) " of Handan Iron ﹠ Steel Group Co., Ltd's invention utilizes sparge pipe to spray, iron scale is effectively removed, suited in the plate rolling production line that uses continuous casting billet, to install and use; " the medium thin slab continuous casting and rolling belt steel surface iron scale control method " of the Yu Yang of Angang Stock Co., Ltd etc. invention (CN200710010183.5), Composition Control exists: C 0.049-0.20, Si 0.015-0.20, Mn 0.15-1.50, P 0.009-0.013, S0.004-0.01, Nb 0-0.04, V 0-0.04, Ti 0-0.02, and remaining is Fe and trace impurity; And propose that the Si content in the steel is strict controlled in Si≤0.20% (even Si≤0.05%) and just can get up to eliminate preferably the effect of red scale.As seen, the method of removing hot rolled steel plate surface red scale mainly contains mechanical descaling method, high-pressure water descaling method and the Si content in the steel is strict controlled in Si≤0.20%, but no matter adopt above which kind of method, the increase that all can bring the hot rolled steel plate production cost.So, how to reduce or eliminate the red scale on hot rolled steel plate surface, again the production cost of steel plate is controlled at simultaneously a rational scope with interior be the problem that iron and steel enterprise is worth further investigation.
Summary of the invention
The Methods of Surface Quality Control of a kind of hot rolled steel plate that technical problem solved by the invention provides, can reduce scales generated on surfaces of hot-rolled steel plates, the scope of application of the method steel grade chemical composition is wider, is particularly useful for containing the hot rolled steel plate of Nb, V, Mn and Si microalloy element.
The hot rolled steel plate that contains Nb, V, Mn and Si microalloy element according to production technology preparation of the present invention, it is characterized in that: chemical component weight percentage is 0.05≤C≤0.20%, Si≤0.70%, 0.20%≤Mn≤2.00%, 0.02%≤Nb≤0.10%, 0.03%≤V≤0.15%, Ti≤0.12%, P≤0.040%, S≤0.030%, and surplus is iron and inevitable impurity.The characteristics of hot rolled steel plate of the present invention on composition are: the scope of application to the hot rolled steel plate chemical composition is very wide, do not need to control the extremely low degree of Si content, as need not to control Si and be lower than 0.2%, even be lower than 0.05%, still can reduce generating the relatively poor Fe of fissility
2SiO
4(2FeOSiO
2) iron scale of structure; Can also avoid controlling the smelting cost that low Si content increases.
The present invention realizes to reach control hot rolled steel plate surface quality by the following method in order to reduce scales generated on surfaces of hot-rolled steel plates:
The chemical component weight percentage of hot rolled steel plate is 0.05≤C≤0.20%, Si≤0.70%, 0.20%≤Mn≤2.00%, 0.02%≤Nb≤0.10%, 0.03%≤V≤0.15%, Ti≤0.12%, P≤0.040%, S≤0.030%, and surplus is iron and inevitable impurity; Its preparation method may further comprise the steps: casting slab → heating → high-pressure water descaling → roughing → Coil Box is batched → finish rolling → cool off → batch.
The improvement of process portion is:
1, heating: the control tapping temperature is 1150 ℃-1250 ℃.
2, finish rolling: start rolling temperature is controlled at 950-1050 ℃, and finishing temperature is controlled at 830 ℃-900 ℃.
3, cooling: leading portion is the type of cooling of cold+sparse cooling of back segment soon.Concrete, leading portion: the cooling velocity with 20-60 ℃/s is cooled to 650-780 ℃; Back segment: the cooling velocity with 2-20 ℃/s is cooled to 550-650 ℃.
By preparation method's control surface quality of the present invention, can reduce scales generated on surfaces of hot-rolled steel plates, and the scope of application of steel grade chemical composition is wider; Need not the existing equipment transformation, process conditions are simply controlled, and have the advantage that energy consumption is low, cost is low.
To sum up, preparation method's of the present invention advantage is:
1, in view of the characteristic of hot rolled steel plate chemical composition of the present invention, preparation method of the present invention is the lower characteristics of solid solubility temperature according to the precipitated phases such as VN in the steel grade combined microalloying, can suitably reduce hot rolling tapping temperature, finish rolling inlet temperature (being start rolling temperature), finishing temperature and coiling temperature, thereby reduce the generation quantity (increasing fast because iron scale can raise with temperature) of iron scale.
2, after the band steel goes out finishing mill, adopt the soon mode of cold+sparse cooling of back segment of leading portion, thereby reduce with the time of steel in high temperature section, the belt steel surface that has increased the laminar cooling water covering is long-pending, stop the band steel to contact with oxygen in the air, thereby reduce the generation quantity of iron scale.Simultaneously, because the sparse type of cooling has reduced with the intensity of cooling of steel in laminar cooling process the size that is conducive to increase the quantity of ferritic structure and suitably controls ferrite crystal grain, thereby toughness and the punch forming performance of raising hot rolled steel plate.
3, the temperature (being tapping temperature, finish rolling inlet temperature, finishing temperature and coiling temperature) of reduction rolling mill practice process is conducive to reduce heating furnace energy resource consumption and burning scaling loss, has greatly reduced the rolling cost of hot rolled steel plate.
The specific embodiment
Below by specific description of embodiments of the present invention the explanation but do not limit the present invention.
Prior art is: CN200710010183.5 " medium thin slab continuous casting and rolling belt steel surface iron scale control method ".
Composition Control exists: C 0.049-0.20, Si 0.015-0.20, Mn 0.15-1.50, P 0.009-0.013, S 0.004-0.01, Nb 0-0.04, V 0-0.04, Ti 0-0.02, remaining is Fe and trace impurity.
Preparation process condition:
Heating cycle: strand is heated to 1180-1300 ℃;
Hot rolling technology: the operation of rolling is taked the high temperature hot-rolling method, roughing start rolling temperature＞1130 ℃; Finish rolling start rolling temperature＞1030 ℃; Finishing temperature＞880 ℃;
Process for cooling: roll the cooling of rear laminar flow and take to force the method cooled off, 4 ℃ of cooling velocities/s-17 ℃/s;
Coiling technique: coiling temperature is controlled at 550-650 ℃.
The chemical component weight percentage of hot rolled steel plate of the present invention is: 0.05≤C≤0.20%, Si≤0.70%, 0.20%≤Mn≤2.00%, 0.02%≤Nb≤0.10%, 0.03%≤V≤0.15%, Ti≤0.12%, P≤0.040%, S≤0.030%, surplus are iron and inevitable impurity.The preparation method may further comprise the steps: casting slab → heating → high-pressure water descaling → roughing → Coil Box is batched → finish rolling → cool off → batch.
The improvement of process portion is:
1, heating: the control tapping temperature is 1150 ℃-1250 ℃.
2, finish rolling: start rolling temperature is controlled at 950-1050 ℃, and finishing temperature is controlled at 830 ℃-900 ℃.
3, cooling: leading portion is the type of cooling of cold+sparse cooling of back segment soon.Concrete, leading portion: the cooling velocity with 20-60 ℃/s is cooled to 650-780 ℃; Back segment: the cooling velocity with 2-20 ℃/s is cooled to 550-650 ℃.
Embodiment
The chemical component weight percentage of hot rolled steel plate of the present invention is: 0.05≤C≤0.20%, Si≤0.70%, 0.20%≤Mn≤2.00%, 0.02%≤Nb≤0.10%, 0.03%≤V≤0.15%, Ti≤0.12%, P≤0.040%, S≤0.030%, surplus are iron and inevitable impurity.Smelt to get molten steel according to table 1.
The chemical composition of table 1 hot rolled steel plate of the present invention (percentage by weight %)
| Sequence number | C | Si | Mn | P | S | Nb | V | Ti |
| 1 | 0.15 | 0.68 | 1.50 | 0.018 | 0.019 | 0.035 | 0.075 | 0.095 |
| 2 | 0.20 | 0.22 | 0.92 | 0.022 | 0.021 | 0.086 | 0.048 | 0.025 |
| 3 | 0.08 | 0.51 | 0.58 | 0.031 | 0.008 | 0.051 | 0.032 | 0.074 |
| 4 | 0.05 | 0.32 | 2.00 | 0.015 | 0.016 | 0.020 | 0.050 | 0.052 |
| 5 | 0.10 | 0.48 | 1.35 | 0.014 | 0.017 | 0.029 | 0.046 | 0.108 |
| 6 | 0.07 | 0.25 | 0.80 | 0.019 | 0.009 | 0.025 | 0.045 | 0 |
| 7 | 0.08 | 0.28 | 0.90 | 0.012 | 0.012 | 0.030 | 0.050 | 0 |
| 8 | 0.06 | 0.30 | 0.70 | 0.016 | 0.007 | 0.022 | 0.041 | 0 |
| 9 | 0.07 | 0.21 | 0.85 | 0.017 | 0.015 | 0.020 | 0.048 | 0 |
| 10 | 0.06 | 0.24 | 0.75 | 0.012 | 0.008 | 0.026 | 0.046 | 0 |
Above-mentioned five groups of molten steel are cast into the continuous casting steel billet of 200mm * (700-1300mm) * 11000mm with conventional continuous cast method with it.In walking beam furnace, heat, tapping temperature is 1150 ℃-1250 ℃, send R1 (First roughing mill) roughing mill rolling three roads through behind the high-pressure water descaling, rolling three roads of R2 (second roughing mill) roughing mill, intermediate slab thickness is at 36-40mm after the roughing.Intermediate blank adopts centreless to transfer Coil Box and batches.Then send F1-F6 (sequence number of each frame of mm finishing mill unit) finishing mill to be rolled, the finish rolling start rolling temperature is controlled at 950-1050 ℃, and the finishing temperature scope is 830 ℃-900 ℃.Cooling rate with 20-60 ℃/s after the finish rolling is cooled to 650-780 ℃, then is cooled to batch in 550-650 ℃ the temperature range with the cooling rate of 2-20 ℃/s.The finished steel plate any surface finish does not all produce iron scale, satisfies user's instructions for use fully.The detailed process parameter sees Table 2, and mechanical property sees Table 3.
Table 2 rolling technological parameter/℃
Table 3 mechanical property
Claims (2)
1. hot rolled steel plate that contains Nb, V, Mn and Si microalloy element, it is characterized in that: chemical component weight percentage is: 0.05%≤C≤0.20%, 0.21%≤Si≤0.70%, 0.20%≤Mn≤2.00%, 0.02%≤Nb≤0.10%, 0.03%≤V≤0.15%, Ti≤0.12%, P≤0.040%, S≤0.030%, surplus are iron and inevitable impurity;
Its preparation method may further comprise the steps: casting slab → heating → high-pressure water descaling → roughing → Coil Box is batched → finish rolling → cool off → batch; Wherein, to make furnace temperature be 1150 ℃-1250 ℃ in the heating time control; The finish rolling start rolling temperature is controlled at 950-1050 ℃, and finishing temperature is controlled at 830 ℃-900 ℃; Adopt the soon type of cooling of cold+sparse cooling of back segment of leading portion, cooling condition is: leading portion is cooled to 650-780 ℃ with the cooling velocity of 20-60 ℃/s; Back segment is cooled to 550-650 ℃ with the cooling velocity of 2-20 ℃/s.
2. preparation method who reduces scales generated on surfaces of hot-rolled steel plates, the chemical component weight percentage of this hot rolled steel plate is: 0.05%≤C≤0.20%, 0.21%≤Si≤0.70%, 0.20%≤Mn≤2.00%, 0.02%≤Nb≤0.10%, 0.03%≤V≤0.15%, Ti≤0.12%, P≤0.040%, S≤0.030%, surplus are iron and inevitable impurity;
The preparation method may further comprise the steps: casting slab → heating → high-pressure water descaling → roughing → Coil Box is batched → finish rolling → cool off → batch;
It is 1150 ℃-1250 ℃ that furnace temperature is made in the heating time control; The finish rolling start rolling temperature is controlled at 950-1050 ℃, and finishing temperature is controlled at 830 ℃-900 ℃;
It is characterized in that: adopt the soon type of cooling of cold+sparse cooling of back segment of leading portion; Cooling condition is: leading portion is cooled to 650-780 ℃ with the cooling velocity of 20-60 ℃/s; Back segment is cooled to 550-650 ℃ with the cooling velocity of 2-20 ℃/s.
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| CN103014487A (en) * | 2011-09-20 | 2013-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling steel plate for automobile girder, and production method thereof |
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| CN102896161B (en) * | 2012-10-22 | 2016-01-13 | 北京首钢股份有限公司 | A kind of minimizing technology of boracic cold-rolled steel hot rolling iron scale |
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| CN105256235B (en) * | 2015-11-19 | 2017-07-07 | 攀钢集团西昌钢钒有限公司 | The minimizing technology of steel alloy for high-pressure tank and its scale on surface |
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| CN105921515B (en) * | 2016-05-20 | 2018-10-19 | 首钢集团有限公司 | Hot-rolling high-strength steel Automobile Plate descaling method |
| CN106544485B (en) * | 2016-11-08 | 2018-07-03 | 武汉钢铁有限公司 | The manufacturing method of thin slab continuous casting and rolling great surface quality medium and high carbon steel |
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| CN113664036B (en) * | 2020-05-13 | 2024-03-01 | 上海梅山钢铁股份有限公司 | Rolling method for high-strength acid washed sheet |
| CN114054515B (en) * | 2021-06-18 | 2024-02-27 | 德龙钢铁有限公司 | Method for controlling scale of cold rolling base stock after rolling |
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