CN101586211A - Hot-rolled steel sheet containing niobium steel and producing method thereof - Google Patents
Hot-rolled steel sheet containing niobium steel and producing method thereof Download PDFInfo
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Abstract
The present invention discloses a hot-rolled steel sheet containing niobium steel and a producing method thereof, capable of reducing the difficulty of organization of the production effectively. The chemical components of the hot-rolled steel sheet contains (weight percentage ) C: 0.07% to 0.12%, Si: less than or equal to 0.35%, Mn: 1.10% to 1.50%, Nb: 0 to 0.10%, P: less than or equal to 0.025%, S: less than or equal to 0.0125%, the balance is Fe and inevitable impurity elements. The method for producing the hot-rolled steel sheet includes steps of producing a continuous casting plate blank, roughing, fine rolling, finishing to gage, cooling, coiling, etc. The niobium-containing steel of identical chemical component is benefit to the scheduling of the organization of production, and the finished product may meet the usage requirements of structural components of automobile beam plate, automobile wheels, building structure, engineering machinery and the like, particularly is suitable for the production of the hot-rolled steel sheet.
Description
Technical field
The present invention relates to a kind of steel plate and production method thereof, especially relate to a kind of hot-rolled steel sheet containing niobium steel and production method thereof.
Background technology
At present, structural hot rolled steel plate is a kind of ferrous materials that purposes is the widest in the strip product, usage quantity is maximum, be mainly used in vehicle structure, engineering machinery, building structure and other general structural partss, be divided into structural carbon steel and structural low usually according to steel grade.Usually add microalloy elements such as vanadium, titanium, niobium in the structural low, the rolling and technology for controlled cooling by suitable controlling hot rolling, thus produce combination of strength and toughness hot-rolled steel sheet preferably.
At present, market is bigger to the demand of the low-alloy structural steel plate of yield strength ReL 〉=350MPa, ReL 〉=400MPa and ReL 〉=450MPa, because be subjected to the restriction of the technological standard and the processing unit ability of low alloy steel performance, execution, other structural hot rolled steel plate of different intensity scale often adopts different chemical ingredientss.When the low-alloy structural niobium-containing steel plate of production 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 ingredients 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 yield strength ReL 〉=350MPa, ReL 〉=400MPa and ReL 〉=450MPa with the steel of same chemical ingredients is the active demand of this area.
Summary of the invention
Technical problem to be solved by this invention provides a kind of hot-rolled steel sheet containing niobium steel and production method thereof that reduces the 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 ingredients 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 ingredients 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 sheet of 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 sheet of 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 sheet of 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 ingredients, by to heating and temperature control, the rough rolling plate blank gauge control, finish rolling temperature in, 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 sheet of yield strength, as: yield strength ReL is respectively the hot-rolled steel sheet of 350MPa～410MPa, 400MPa～460MPa and 450MPa～510MPa, can satisfy automotive frame, automotive wheel, building structure, the service requirements of structural partss 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 handiness 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 sheet and promote the use of.
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 ingredients 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 ingredients 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 ingredients/%
| Chemical ingredients | 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 ingredients 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 casting; And before the continuous casting steel billet moulding, can carry out hot metal pretreatment → 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 reeling 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 precision 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 reeling machine batches, finished product to the end.
In the above-described embodiment, for obtaining the hot-rolled steel sheet of 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 sheet of yield strength 350MPa≤ReL≤410MPa.
After thickness was 5 batches the continuous casting steel billet production of 200mm in the employing table 1, its processing parameter was shown in following table 2 and table 3.
Table 2 yield strength ReL is the rolling technological parameter of the hot-rolled steel sheet of 350MPa～410MPa
Table 3 yield strength ReL is the end properties of the hot-rolled steel sheet of 350MPa～410MPa
For obtaining the hot-rolled steel sheet of 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 sheet of yield strength 400MPa≤ReL≤460MPa.
After thickness was 5 batches the continuous casting steel billet production of 200mm in the employing table 1, its processing parameter was shown in following table 4 and table 5.
Table 4 yield strength ReL is the rolling technological parameter of the hot-rolled steel sheet of 400MPa～460MPa
Table 5 yield strength ReL is the end properties of the hot-rolled steel sheet of 400MPa～460MPa
For obtaining the hot-rolled steel sheet of 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 sheet of yield strength 450MPa≤ReL≤510MPa.
After thickness was 5 batches the continuous casting steel billet production of 200mm in the employing table 1, its processing parameter was shown in following table 6 and table 7.
Table 6 yield strength ReL is the rolling technological parameter of the hot-rolled steel sheet of 450MPa～510MPa
Table 7 yield strength ReL is the end properties of the hot-rolled steel sheet of 450MPa～510MPa
Claims (7)
1. hot-rolled steel sheet containing niobium steel, it is characterized in that: its chemical ingredients 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.
2. 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 ingredients 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.
3. the production method of hot-rolled steel sheet containing niobium steel as claimed in claim 2 is characterized in that:
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 sheet of yield strength 350MPa≤ReL≤410MPa.
4. the production method of hot-rolled steel sheet containing niobium steel as claimed in claim 2 is characterized in that:
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 sheet of yield strength 400MPa≤ReL≤460MPa.
5. the production method of hot-rolled steel sheet containing niobium steel as claimed in claim 2 is characterized in that:
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 sheet of yield strength 450MPa≤ReL≤510MPa.
6. according to the production method of any described hot-rolled steel sheet containing niobium steel of claim in the claim 2～5, it is characterized in that: in step b, the slab after the roughing adopts centreless to transfer Coil Box and batches.
7. according to the production method of any described hot-rolled steel sheet containing niobium steel of claim in the claim 2～5, it is characterized in that: in step a, continuous casting steel billet thickness X=200mm.
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| CN2009103041290A CN101586211B (en) | 2009-07-08 | 2009-07-08 | Producing method of hot-rolled steel sheet containing niobium steel |
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| CN201110157295A Division CN102230127B (en) | 2009-07-08 | 2009-07-08 | Production method of hot-rolled steel plate made of niobium (Nb)-containing steel |
| CN2011101571783A Division CN102247986A (en) | 2009-07-08 | 2009-07-08 | Method for producing hot rolled steel plate made of niobium-containing steel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103316912A (en) * | 2013-07-09 | 2013-09-25 | 武汉科技大学 | Rolling method for extremely-thin niobium strip |
| CN103668003A (en) * | 2013-11-28 | 2014-03-26 | 安徽银力铸造有限公司 | Preparation method of hot rolled steel for automobile beam |
| CN103668004A (en) * | 2013-11-28 | 2014-03-26 | 安徽银力铸造有限公司 | Preparation method of hot rolled steel for automobile transmission shaft tube |
| 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 |
| CN104988392A (en) * | 2015-07-17 | 2015-10-21 | 武汉钢铁(集团)公司 | Steel for 610 MPa grade low-cost girder and ultrafast cooling manufacturing method thereof |
| CN107675087A (en) * | 2017-11-17 | 2018-02-09 | 武汉钢铁有限公司 | A kind of good mine wheel-use steel material of low temperature impact properties and production method |
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2009
- 2009-07-08 CN CN2009103041290A patent/CN101586211B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103316912A (en) * | 2013-07-09 | 2013-09-25 | 武汉科技大学 | Rolling method for extremely-thin niobium strip |
| 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 |
| CN104073716B (en) * | 2013-08-07 | 2016-08-10 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of automotive frame hot rolled steel plate and production method thereof |
| CN103668003A (en) * | 2013-11-28 | 2014-03-26 | 安徽银力铸造有限公司 | Preparation method of hot rolled steel for automobile beam |
| CN103668004A (en) * | 2013-11-28 | 2014-03-26 | 安徽银力铸造有限公司 | Preparation method of hot rolled steel for automobile transmission shaft tube |
| CN103668003B (en) * | 2013-11-28 | 2016-03-09 | 安徽银力铸造有限公司 | A kind of preparation method of automotive frame hot-rolled steel |
| CN103668004B (en) * | 2013-11-28 | 2016-04-20 | 安徽银力铸造有限公司 | The preparation method of the effective hot-rolled steel of a kind of truck drive shaft |
| CN104988392A (en) * | 2015-07-17 | 2015-10-21 | 武汉钢铁(集团)公司 | Steel for 610 MPa grade low-cost girder and ultrafast cooling manufacturing method thereof |
| CN107675087A (en) * | 2017-11-17 | 2018-02-09 | 武汉钢铁有限公司 | A kind of good mine wheel-use steel material of low temperature impact properties and production method |
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| CN101586211B (en) | 2011-10-05 |
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