CN101676427B - Steel plate with high strength and low yield ratio - Google Patents
Steel plate with high strength and low yield ratio Download PDFInfo
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- CN101676427B CN101676427B CN2008102001003A CN200810200100A CN101676427B CN 101676427 B CN101676427 B CN 101676427B CN 2008102001003 A CN2008102001003 A CN 2008102001003A CN 200810200100 A CN200810200100 A CN 200810200100A CN 101676427 B CN101676427 B CN 101676427B
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Abstract
The present invention provides a steel plate with high strength and low yield ratio, which comprises chemical components as follows: C: 0.15-0.20 wt%, Si: 1.0-2.0 wt%, Mn: 1.8-2.0 wt%, Al<=0.036 wt%, V: 0.05-0.1 wt%, P<=0.01 wt%, S<=0.005 wt%, Cr: 0.8-1.0 wt%, the residual is Fe and other unavoidable impurity. The hot-rolling steel plate with high strength and low yield ratio is obtained by adopting low alloyed processing and traditional TMCP rolling technique, which has a strength reaching to 1200-1500 MPa, simultaneously, has better low temperature impact toughness. The steel plate is suitable for the fields requiring high strength and low yield ratio, such as mechanical manufacture, fuel/gas delivery pipeline, building, bridge, steel rail and pressure vessel, etc.
Description
Technical field
The present invention relates to the ferrous materials class, specifically, the present invention relates to a kind of steel plate with high strength and low yield ratio.
Background technology
Generally, the traditional carbon steel or the yield strength/tensile strength of micro-alloyed steel are that yield tensile ratio is higher, more than 0.85 or higher.For example, though its intensity height of part ultra-fine grain steel because its work hardening capacity is low, thereby causes its even extensibility lower, YIELD STRENGTH promptly has very high yield tensile ratio very near tensile strength, even near 1.Some withstand shocks or the Application Areas of colliding such as antidetonation with fields such as building structural steel, automobile steels, require material to have lower yield tensile ratio so that can the absorption portion energy before the material completely destroy, thereby delay the time to rupture of material.At present, hot rolling low yield strength ratio steel mainly contains dual phase steel or heterogeneous steel, promptly, make the soft phase (as ferrite) in the material effectively be made up or mate, finally reach the purpose that reduces yield tensile ratio with hard (as martensite, bainite) mutually by adjusting composition and processing parameter.Widely used at automotive field at present is hot-rolled dual-phase steel, and its typical tissue signature is the island martensite body that distributing on the polygonal ferrite matrix, also has some to comprise complex phase or the heterogeneous steel of bainite or residual austenite in addition.Adopt the hot-rolled dual-phase steel of traditional TMCP explained hereafter, its tensile strength is the highest about 800MPa, and the intensity (as reaching more than the 1000MPa) that further improves steel keeps lower yield tensile ratio just to seem very difficult simultaneously.
By retrieval, have following patent documentation to relate to the low yield strength ratio steel grade, its chemical ingredients and mechanical property are respectively as shown in Table 1 and Table 2.
The chemical ingredients (wt%) of the low yield strength ratio steel grade that the existing patent documentation of table 1 relates to
The mechanical property of the low yield strength ratio steel grade that the existing patent documentation of table 2 relates to
From table 1, table 2 as can be seen, the intensity of existing low yield strength ratio steel grade is all very low, and the steel grade chemical ingredients that some patent documentations relate to is comparatively complicated, has not only increased material cost, and is not suitable for requirement and has the very working conditions of high strength and low yield strength ratio.
Consider that some special dimensions not only should have performances such as high strength, low yield strength ratio with steel, and should be easy to produce, with low cost, the present inventor is by adjusting chemical ingredients, adopt traditional TMCP rolling technology, designed a kind of steel plate with high strength and low yield ratio, thereby finished the present invention.
The object of the present invention is to provide a kind of steel plate with high strength and low yield ratio.
Summary of the invention
The invention provides a kind of steel plate with high strength and low yield ratio, the chemical ingredients of described steel plate comprises: C:0.15～0.20wt%, Si:1.0～2.0wt%, Mn:1.8～2.0wt%, A1≤0.036wt%, V:0.05～0.1wt%, P≤0.01wt%, S≤0.005wt%, Cr:0.8～1.0wt%, surplus is Fe and other unavoidable impurities.
In a preferred implementation: the microstructure of described steel plate is a bainite.
In another preferred implementation: the microstructure of described steel plate also can be tiny bainite and martensite.
Different with traditional intensity of passing through ferrite and martensite duplex structure raising hot-rolled steel sheet with the reduction yield tensile ratio, steel grade of the present invention handle and adopt traditional TMCP technology by low alloying and quicken the intensity that cooling can improve the hot rolling Plate Steel significantly (〉=1200MPa), the yield tensile ratio of steel plate still can remain on (≤0.72) on the lower level simultaneously.
The chemical ingredients of steel plate with high strength and low yield ratio involved in the present invention is simple, the five big elements in steel, only adds alloying element V and Cr, and its strength level can stably remain on the above level of 1200MPa.The chemical ingredients characteristics of this steel plate are Si and Mn and V, the Cr etc. that contain high level, wherein Si and Mn all are alloying elements the most frequently used in the steel, raw materials cost is lower, and the higher relatively purpose of Mn content is that stable austenite increases austenitic solid solution strengthening effect simultaneously.
Alloying element V can separate out with crystal grain thinning by precipitation and produce reinforcement, the carbonitride of vanadium is separated out to be on good terms and is significantly improved intensity in the steel, adding a small amount of vanadium just has significant strengthening effect, considers that the material cost of V is higher, and the present invention is controlled at 0.05～0.1wt% with V.Add more Cr element and can improve the hardening capacity and the intensity of steel plate, when steel plate is cooled off after rolling finishing, avoid forming perlite and form more tiny bainite and martensitic stucture, because bainite structure itself is exactly the mixture of ferrite and carbide, in fact also be soft and hard product of mixing mutually, have than low yield strength ratio, but intensity is higher.
On rolling technology, adopt widely used TMCP+ to roll after-acceleration process for cooling technology, can obtain more tiny bainite structure to improve the intensity of steel by quick process for cooling after the finish to gauge, for example, steel plate about thickness 40mm can reach the intensity rank of 1200MPa more than 1500MPa, has good low-temperature impelling strength simultaneously.
Beneficial effect of the present invention is:
The intensity of steel plate of the present invention is compared with traditional micro-alloyed steel and is increased significantly, its yield strength and tensile strength can reach 800MPa respectively and more than the 1200MPa, have very low yield tensile ratio (≤0.72) and good toughness (20 ℃ time ballistic work be 72J) simultaneously again.From the angle of actual production, need not to add the noble metal elements Mo in the steel and can reach above-mentioned performance index, can effectively reduce the production cost of steel, and the production technique of steel plate of the present invention is simple, cost is lower.Steel plate of the present invention is applicable to requiring to have the high strength low yield strength ratio simultaneously to the toughness field that has certain requirements, as machinofacture, oil transportation/feed channel, building, bridge, rail, pressurized vessel etc.
Description of drawings
Fig. 1 is that the summer of the embodiment of the invention 5 steel plates under differing temps is than the serial Impulse Test Result of V-type.
Fig. 2 is optical microstructure's photo of the embodiment of the invention 1 steel plate.
Fig. 3 is optical microstructure's photo of the embodiment of the invention 3 steel plates.
Embodiment
Below for a more detailed description to the present invention in conjunction with the accompanying drawings with embodiment.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1
Press chemical ingredients converter shown in the table 3 or electrosmelting molten steel, adopt the vacuum oven secondary refining again, be cast as steel billet (ingot), its thickness is 220mm, base (ingot) is heated to 1200 ℃, be incubated 1～2 hour, be rolled then, start rolling temperature is 1000～1070 ℃, and rolling thickness is 120～220mm, accumulative total deflection 〉=50% more than 950 ℃, intermediate blank is treated temperature to 900 ℃ about 1000 ℃, finishing temperature is 800～850 ℃, and steel plate thickness is 100mm, roll the back and carry out water-cooled with the speed of 8～10 ℃/s, final cooling temperature is 500～550 ℃.
Embodiment 2
Except base (ingot) Heating temperature is 1200 ℃, steel plate thickness is 40mm, and all the other embodiments are with embodiment 1.
Embodiment 3-5
Except base (ingot) Heating temperature is 1150 ℃, steel plate thickness is 80mm, and all the other embodiments are with embodiment 1.
The chemical ingredients (wt%) of table 3 embodiment of the invention 1-5 steel plate
The test example
Steel plate to embodiment of the invention 1-5 carries out Mechanics Performance Testing, and test result sees Table 4.
The mechanical property of table 4 embodiment of the invention 1-5 steel plate
| Sequence number | Yield strength MPa | Tensile strength MPa | Unit elongation % | Yield ratio | -20 ℃ of horizontal V-type ballistic works |
| Embodiment 1 | 790 | 1190 | 17.4 | 0.664 | 34 |
| Embodiment 2 | 835 | 1225 | 16.8 | 0.682 | 36 |
| Embodiment 3 | 973 | 1428 | 15.0 | 0.681 | 40 |
| Embodiment 4 | 1025 | 1475 | 14.4 | 0.695 | 47 |
| Embodiment 5 | 1142 | 1588 | 14.0 | 0.719 | 72 |
Fig. 1 shows that thickness is that the impact toughness value of the 5# test steel plate of 40mm reduces along with the reduction of test temperature, even at-40 ℃, sample still shows certain toughness.
Fig. 2 shows that the microstructure of steel plate is a bainite structure, and Fig. 3 shows that the microstructure of steel plate is tiny bainite and martensitic stucture.
Claims (1)
1. steel plate with high strength and low yield ratio, it is characterized in that, the chemical ingredients of described steel plate comprises: C:0.15～0.20wt%, Si:1.0～2.0wt%, Mn:1.8～2.0wt%, Al≤0.036wt%, V:0.05～0.1wt%, P≤0.01wt%, S≤0.005wt%, Cr:0.8～1.0wt%, and surplus is Fe and other unavoidable impurities; The microstructure of described steel plate is bainite or is tiny bainite and martensite; The yield strength of described steel plate and tensile strength reach 800MPa respectively and more than the 1200MPa, yield tensile ratio≤0.72.
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| CN2008102001003A CN101676427B (en) | 2008-09-19 | 2008-09-19 | Steel plate with high strength and low yield ratio |
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| CN2008102001003A CN101676427B (en) | 2008-09-19 | 2008-09-19 | Steel plate with high strength and low yield ratio |
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| CN101676427A CN101676427A (en) | 2010-03-24 |
| CN101676427B true CN101676427B (en) | 2011-08-24 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534387A (en) * | 2011-12-12 | 2012-07-04 | 中国铁道科学研究院金属及化学研究所 | Bainite/martensite steel rail with 1,500 Mpa level of high toughness and manufacturing method thereof |
| CN104109813B (en) * | 2014-07-03 | 2016-06-22 | 西南石油大学 | A kind of big expansion-ratio expansion pipe dual phase steel of high resistance to Produced Water In Oil-gas Fields, Ngi corrosion and preparation method thereof |
| CN105525205B (en) * | 2015-12-25 | 2017-07-25 | 钢铁研究总院 | A kind of 390MPa grades of normalizing type microalloying steel plate |
| CN112143960B (en) * | 2019-06-28 | 2022-01-14 | 宝山钢铁股份有限公司 | Steel plate with ultrahigh strength and low yield ratio and manufacturing method thereof |
| CN113388779B (en) * | 2021-05-21 | 2022-07-22 | 鞍钢股份有限公司 | 1.5 GPa-grade ultrahigh-strength high-plasticity high-hole-expansion DH steel plate and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104906A (en) * | 2007-07-19 | 2008-01-16 | 东华大学 | Low-carbon bainite steel and preparation method thereof |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104906A (en) * | 2007-07-19 | 2008-01-16 | 东华大学 | Low-carbon bainite steel and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平10-298648A 1998.11.10 |
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