CN102247986A - Method for producing hot rolled steel plate made of niobium-containing steel - Google Patents
Method for producing hot rolled steel plate made of niobium-containing steel Download PDFInfo
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Abstract
The invention discloses a method for producing a hot rolled steel plate made of niobium-containing steel, which can effectively reduce the difficulty in production organization. The hot rolled steel plate made of niobium-containing steel comprises the following chemical components by mass percent: 0.07-0.12% of C, less than or equal to 0.35% of Si, 1.10-1.50% of Mn, greater than zero and less than or equal to 0.10% of Nb, less than or equal to 0.025% of P, less than or equal to 0.015% of S, and the balance of Fe and inevitable impurity elements. The method for producing the hot rolled steel plate made of niobium-containing steel comprises the steps of producing, rough rolling, finish rolling, final rolling, cooling, coiling and the like of a continuous cast slab. In the method, the niobium-containing steel with the same chemical components is favorable for production organization and scheduling, the obtained finished products can meet the use requirements of structural components such as automotive frames, automotive wheels, building structures, engineering machinery and the like, and the method is especially suitable for popularization and application in production of niobium-containing hot rolled steel plates.
Description
The application is to be on July 8th, 2009 applying date, and application number is 200910304129.0, and denomination of invention is dividing an application of hot-rolled steel sheet containing niobium steel and production method thereof.
Technical field
The present invention relates to a kind of steel plate and production method thereof, especially relate to a kind of production method of hot-rolled steel sheet containing niobium steel.
Background technology
At present, structural hot rolled steel plate is a kind of ferrous materials that purposes is the widest in the strip product, use amount is maximum, be mainly used in vehicle structure, engineering machinery, building structure and other general constitutional details, be divided into structural carbon steel and low-alloy structural steel usually according to steel grade.Usually add microalloy elements such as vanadium, titanium, niobium in the low-alloy structural steel, the rolling and control process for cooling by suitable controlling hot rolling, thus produce combination of strength and toughness hot rolled steel plate preferably.
At present, market is bigger to the demand of the low-alloy structural steel plate of lower yield strength ReL 〉=350MPa, ReL 〉=400MPa and ReL 〉=450MPa, because be subjected to the restriction of the technical standard and the process equipment ability of low-alloy steel performance, execution, other structural hot rolled steel plate of different intensity scale often adopts different chemical compositions.When producing the low-alloy structural niobium-containing steel plate of lower yield strength ReL 〉=350MPa, ReL 〉=400MPa and ReL 〉=450MPa, just need to adopt three kinds of different chemical compositions.Add that the purposes difference forms the more special-purpose steel trade mark again, cause the identical steel grade of mechanical property and the trade mark, chemical composition exists bigger difference or intersection situation, and this has not only increased difficulty for the organization of production of smelting and rolling process, and the welding of returning between the steel plate is made troubles.Therefore, the steel plate of producing lower yield strength ReL 〉=350MPa, ReL 〉=400MPa and ReL 〉=450MPa with the steel of same chemical composition is the active demand of this area.
Summary of the invention
Technical problem to be solved by this invention provides a kind of production method that reduces the hot-rolled steel sheet containing niobium steel of organization of production difficulty.
The technical solution adopted for the present invention to solve the technical problems is: hot-rolled steel sheet containing niobium steel, it is characterized in that: its chemical composition mass percent is C:0.07%～0.12%, Si :≤0.35%, Mn:1.10%～1.50%, Nb:0＜Nb≤0.10%, P :≤0.025%, S :≤0.015%, surplus is Fe and unavoidable impurities element.
The production method of hot-rolled steel sheet containing niobium steel in the such scheme comprises:
A produces continuous casting steel billet, the continuous casting steel billet thickness X, continuous casting steel billet chemical composition mass percent is C:0.07%～0.12%, Si :≤0.35%, Mn:1.10%～1.50%, Nb:0＜Nb≤0.10%, P :≤0.025%, S :≤0.015%, surplus is Fe and unavoidable impurities element;
B is heated to 1 pair of slab of temperature t with continuous casting steel billet and carries out roughing, 1200 ℃≤t1≤1260 ℃, then the slab after the roughing is batched;
Slab after the c roughing carries out finish rolling under the t2 temperature, 950 ℃≤t2≤1050 ℃;
Slab after the d finish rolling carries out finish to gauge under the t3 temperature, 830 ℃≤t3≤900 ℃;
E laminar flow cooling is cooled to the average cooling rate of 10～25 ℃/s in the coiling temperature scope of 4,550 ℃≤t4 of temperature t≤640 ℃ and batches.
Further be:
Among the step b, heating and temperature control is in 1250 ℃＜t1≤1260 ℃, and slab thickness is 0.16X～0.17X after the roughing;
Among the step c, final rolling temperature is controlled at 1000 ℃≤t2≤1040 ℃, and by three finish rolling; The finish rolling first passage exit thickness is 0.1X～0.115X, and the second passage exit thickness is 0.065X～0.075X, and the 3rd passage exit thickness is 0.05X～0.06X;
In the steps d, finishing temperature is controlled at 870 ℃≤t3≤900 ℃, and the finish to gauge finished product thickness is 0.015X～0.035X;
Among the step e, be cooled to the average cooling rate of 10～25 ℃/s in the coiling temperature scope of 4,610 ℃≤t4 of temperature t≤640 ℃ and batch, obtain the hot rolled steel plate of lower yield strength 350MPa≤ReL≤410MPa.
Further be:
Among the step b, heating and temperature control is in 1230 ℃＜t1≤1250 ℃, and slab thickness is 0.175X～0.185X after the roughing;
Among the step c, final rolling temperature is controlled at 970 ℃≤t2≤1000 ℃, and by three finish rolling; The finish rolling first passage exit thickness is controlled at 0.105X～0.12X, and the second passage exit thickness is controlled at 0.07X～0.08X, and the 3rd passage exit thickness is controlled at 0.05X～0.06X;
In the steps d, finishing temperature is controlled at 850 ℃≤t3≤880 ℃, and the finish to gauge finished product thickness is 0.015X～0.035X;
Among the step e, be cooled to the average cooling rate of 10～25 ℃/s in the coiling temperature scope of 4,580 ℃≤t4 of temperature t≤610 ℃ and batch, obtain the hot rolled steel plate of lower yield strength 400MPa≤ReL≤460MPa.
Further be:
Among the step b, heating and temperature control is in 1200 ℃＜t1≤1230 ℃, and slab thickness is 0.19X～0.20X after the roughing;
Among the step c, final rolling temperature is controlled at 950 ℃≤t2≤980 ℃, and by three finish rolling; The finish rolling first passage exit thickness is controlled at 0.11X～0.125X, and the second passage exit thickness is controlled at 0.075X～0.085X, and the 3rd passage exit thickness is controlled at 0.05X～0.06X;
In the steps d, finishing temperature is controlled at 830 ℃≤t3≤860 ℃, and the finish to gauge finished product thickness is 0.015X～0.035X;
Among the step e, be cooled to the average cooling rate of 10～25 ℃/s in the coiling temperature scope of 4,550 ℃≤t4 of temperature t≤580 ℃ and batch, obtain the hot rolled steel plate of lower yield strength 450MPa≤ReL≤510MPa.
Further be that in step b, the slab after the roughing adopts centreless to transfer Coil Box and batches.
Further be, in step a, continuous casting steel billet thickness X=200mm.
The invention has the beneficial effects as follows: adopt to contain the niobium steel with a kind of chemical composition, by to heating and temperature control, the rough rolling plate blank THICKNESS CONTROL, finish rolling inlet temperature, the control of finish rolling thickness deformation, control of process parameters such as finishing temperature and coiling temperature, can produce the different hot rolled steel plate of lower yield strength, as: lower yield strength ReL is respectively the hot rolled steel plate of 350MPa～410MPa, 400MPa～460MPa and 450MPa～510MPa, can satisfy automotive frame, automotive wheel, building structure, the instructions for use of constitutional details such as engineering machinery.Simultaneously, the inventive method has also reduced the alloy addition of steel grade, reduced mixed the watering between the steel grade, strengthened the organization of production flexibility between smelting, continuous casting, steel rolling process, realized Flexible Production, improved production efficiency, reduced production cost, be particluarly suitable for containing in the production of niobium hot rolled steel plate and promote the use of.
The specific embodiment
The present invention is further described below in conjunction with embodiment.
Hot-rolled steel sheet containing niobium steel of the present invention, its chemical composition mass percent is C:0.07%～0.12%, Si :≤0.35%, Mn:1.10%～1.50%, Nb:0＜Nb≤0.10%, P :≤0.025%, S :≤0.015%, surplus is Fe and unavoidable impurities element.When producing this hot-rolled steel sheet containing niobium steel, at first obtain continuous casting steel billet, its chemical composition mass percent such as following table: have 5 batches, numbering is respectively 1,2,3,4,5 in the table, and each batch chemical constituents determination sees Table 1.
Table 1: structural steel chemical composition/%
| Chemical composition | C | Si | Mn | P | S | Nb |
| 1 | 0.09 | 0.18 | 1.30 | 0.015 | 0.009 | 0.021 |
| 2 | 0.08 | 0.28 | 1.24 | 0.010 | 0.012 | 0.025 |
| 3 | 0.11 | 0.20 | 1.18 | 0.012 | 0.008 | 0.019 |
| 4 | 0.10 | 0.18 | 1.23 | 0.017 | 0.012 | 0.021 |
| 5 | 0.07 | 0.29 | 1.33 | 0.012 | 0.006 | 0.028 |
The production method of hot-rolled steel sheet containing niobium steel comprises the steps:
A produces continuous casting steel billet, the continuous casting steel billet thickness X, continuous casting steel billet chemical composition mass percent is C:0.07%～0.12%, Si :≤0.35%, Mn:1.10%～1.50%, Nb:0＜Nb≤0.10%, P :≤0.025%, S :≤0.015%, surplus is Fe and unavoidable impurities element.Continuous casting steel billet thickness can be determined according to working condition, is specifications such as 400mm, 300mm, 250mm as producing, and, this is contained the continuous casting steel billet after the niobium steel is cast for 200mm when continuous casting is produced here.Continuous casting steel billet adopts conventional continuous cast method moulding by casting; And before the continuous casting steel billet moulding, can carry out molten iron preliminary treatment → converter → technologies such as external refining.
B is heated to 1 pair of slab of temperature t with continuous casting steel billet and carries out roughing, 1200 ℃≤t1≤1260 ℃, then the slab after the roughing is batched; Thickness after the roughing can be controlled arbitrarily; It batches and also can adopt any coiling machine to batch, and as optimal way, the slab after the roughing adopts centreless to transfer Coil Box and batches, and the coil of strip that can be beneficial to after batching is heated evenly.
Slab after the c roughing carries out finish rolling under the t2 temperature, 950 ℃≤t2≤1050 ℃; The finish rolling process preferably adopts multi-pass rolling, so that the gauge Deformation control is comparatively accurate.
Slab after the d finish rolling carries out finish to gauge under the t3 temperature, 830 ℃≤t3≤900 ℃; Finish to gauge is to finish on the basis of finish rolling, the thickness deformation amount of finish to gauge is controlled at more among a small circle, to improve the dimensional accuracy of steel plate after the finish to gauge.
E laminar flow cooling is cooled to the average cooling rate of 10～25 ℃/s in the coiling temperature scope of 4,550 ℃≤t4 of temperature t≤640 ℃ and batches.This batches and can adopt arbitrarily that coiling machine batches, finished product to the end.
In the above-described embodiment, for obtaining the hot rolled steel plate of lower yield strength at 350MPa≤ReL≤410MPa:
Among the step b, heating and temperature control is in 1250 ℃＜t1≤1260 ℃, and slab thickness is 0.16X～0.17X after the roughing;
Among the step c, final rolling temperature is controlled at 1000 ℃≤t2≤1040 ℃, and by three finish rolling; The finish rolling first passage exit thickness is 0.1X～0.115X, and the second passage exit thickness is 0.065X～0.075X, and the 3rd passage exit thickness is 0.05X～0.06X;
In the steps d, finishing temperature is controlled at 870 ℃≤t3≤900 ℃, and the finish to gauge finished product thickness is 0.015X～0.035X;
Among the step e, be cooled to the average cooling rate of 10～25 ℃/s in the coiling temperature scope of 4,610 ℃≤t4 of temperature t≤640 ℃ and batch, obtain the hot rolled steel plate of lower yield strength 350MPa≤ReL≤410MPa.
After thickness was 5 batches the continuous casting steel billet production of 200mm in the employing table 1, its technological parameter was shown in following table 2 and table 3.
Table 2 lower yield strength ReL is the rolling technological parameter of the hot rolled steel plate of 350MPa～410MPa
Table 3 lower yield strength ReL is the end properties of the hot rolled steel plate of 350MPa～410MPa
For obtaining the hot rolled steel plate of lower yield strength at 400MPa≤ReL≤460MPa:
Among the step b, heating and temperature control is in 1230 ℃＜t1≤1250 ℃, and slab thickness is 0.175X～0.185X after the roughing;
Among the step c, final rolling temperature is controlled at 970 ℃≤t2≤1000 ℃, and by three finish rolling; The finish rolling first passage exit thickness is controlled at 0.105X～0.12X, and the second passage exit thickness is controlled at 0.07X～0.08X, and the 3rd passage exit thickness is controlled at 0.05X～0.06X;
In the steps d, finishing temperature is controlled at 850 ℃≤t3≤880 ℃, and the finish to gauge finished product thickness is 0.015X～0.035X;
Among the step e, be cooled to the average cooling rate of 10～25 ℃/s in the coiling temperature scope of 4,580 ℃≤t4 of temperature t≤610 ℃ and batch, obtain the hot rolled steel plate of lower yield strength 400MPa≤ReL≤460MPa.
After thickness was 5 batches the continuous casting steel billet production of 200mm in the employing table 1, its technological parameter was shown in following table 4 and table 5.
Table 4 lower yield strength ReL is the rolling technological parameter of the hot rolled steel plate of 400MPa～460MPa
Table 5 lower yield strength ReL is the end properties of the hot rolled steel plate of 400MPa～460MPa
For obtaining the hot rolled steel plate of lower yield strength at 450MPa≤ReL≤510MPa:
Among the step b, heating and temperature control is in 1200 ℃＜t1≤1230 ℃, and slab thickness is 0.19X～0.20X after the roughing;
Among the step c, final rolling temperature is controlled at 950 ℃≤t2≤980 ℃, and by three finish rolling; The finish rolling first passage exit thickness is controlled at 0.11X～0.125X, and the second passage exit thickness is controlled at 0.075X～0.085X, and the 3rd passage exit thickness is controlled at 0.05X～0.06X;
In the steps d, finishing temperature is controlled at 830 ℃≤t3≤860 ℃, and the finish to gauge finished product thickness is 0.015X～0.035X;
Among the step e, be cooled to the average cooling rate of 10～25 ℃/s in the coiling temperature scope of 4,550 ℃≤t4 of temperature t≤580 ℃ and batch, obtain the hot rolled steel plate of lower yield strength 450MPa≤ReL≤510MPa.
After thickness was 5 batches the continuous casting steel billet production of 200mm in the employing table 1, its technological parameter was shown in following table 6 and table 7.
Table 6 lower yield strength ReL is the rolling technological parameter of the hot rolled steel plate of 450MPa～510MPa
Table 7 lower yield strength ReL is the end properties of the hot rolled steel plate of 450MPa～510MPa
Claims (3)
1. the production method of hot-rolled steel sheet containing niobium steel is characterized in that:
A produces continuous casting steel billet, the continuous casting steel billet thickness X, continuous casting steel billet chemical composition mass percent is C:0.07%～0.12%, Si :≤0.35%, Mn:1.10%～1.50%, Nb:0＜Nb≤0.10%, P :≤0.025%, S :≤0.015%, surplus is Fe and unavoidable impurities element;
B is heated to 1 pair of slab of temperature t with continuous casting steel billet and carries out roughing, and heating and temperature control is in 1200 ℃＜t1≤1230 ℃, and slab thickness is 0.19X～0.20X after the roughing, then the slab after the roughing is batched;
Slab after the c roughing carries out finish rolling under the t2 temperature, final rolling temperature is controlled at 950 ℃≤t2≤980 ℃, and by three finish rolling; The finish rolling first passage exit thickness is controlled at 0.11X～0.125X, and the second passage exit thickness is controlled at 0.075X～0.085X, and the 3rd passage exit thickness is controlled at 0.05X～0.06X;
Slab after the d finish rolling carries out finish to gauge under the t3 temperature, finishing temperature is controlled at 830 ℃≤t3≤860 ℃, and the finish to gauge finished product thickness is 0.015X～0.035X;
E laminar flow cooling is cooled to the average cooling rate of 10～25 ℃/s in the coiling temperature scope of 4,550 ℃≤t4 of temperature t≤580 ℃ and batches, and obtains the hot rolled steel plate of lower yield strength 450MPa≤ReL≤510MPa.
2. the production method of hot-rolled steel sheet containing niobium steel according to claim 1 is characterized in that: in step b, the slab after the roughing adopts centreless to transfer Coil Box and batches.
3. the production method of hot-rolled steel sheet containing niobium steel according to claim 1 is characterized in that: in step a, and continuous casting steel billet thickness X=200mm.
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Cited By (2)
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| CN104073716A (en) * | 2013-08-07 | 2014-10-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel plate for automotive frame and production method of hot rolled steel plate |
| CN105695870A (en) * | 2014-11-27 | 2016-06-22 | 上海梅山钢铁股份有限公司 | thick hot rolled sheet steel with 450MPa grade yield strength and manufacturing method thereof |
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Application publication date: 20111123 |