CN103627951A - High-toughness boracic carbon structural steel plate roll and production method thereof - Google Patents
High-toughness boracic carbon structural steel plate roll and production method thereof Download PDFInfo
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- CN103627951A CN103627951A CN201310655113.0A CN201310655113A CN103627951A CN 103627951 A CN103627951 A CN 103627951A CN 201310655113 A CN201310655113 A CN 201310655113A CN 103627951 A CN103627951 A CN 103627951A
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Abstract
The invention relates to a high-toughness boracic carbon structural steel plate roll and a production method thereof. The high-toughness boracic carbon structural steel plate roll comprises the following components by weight percentage: less than or equal to 0.30% of carbon, less than or equal to 0.50% of silicon, less than or equal to 1.70% of manganese, less than or equal to 0.035% of phosphorus, less than or equal to 0.035% of sulfur, 0.015-0.050% of aluminum, 8-50 ppm of boron and the balance of iron and microimpurities. The extensibility, room temperature impact toughness and low temperature impact toughness of the existing carbon structural steel and low alloy steel with the yield strength of 215-345 MPa represented by Q235 and SS400 are improved by boron microalloying and structure homogenization.
Description
Technical field
The present invention relates to structural carbon steel and low alloy steel, be specifically related to a kind of high tenacity boracic structural carbon steel coiled sheet and production method thereof.
Background technology
The production Q235 of each steel mill structural carbon steel coiled sheet is to adopt general carbon manganese Composition Design at present.Ubiquitous problem is the problem of extension and strength property deficiency that easily produces at 20～25.4mm thickness range, can not meet the requirement of GB/T700 completely; For other thickness dimension boards or the simultaneous problem of coiled sheet, be that sheet material microstructure ' ferrite+a small amount of perlite ' occurs that structural banding distributes, easily produce stretching fracture layering and impact fracture layering, and the anisotropy of material property.
Summary of the invention
The object of the present invention is to provide a kind of high tenacity boracic structural carbon steel coiled sheet and production method thereof, by boron micro-alloyed, microstructure homogenization, improve existing take yield strength 215～345MPa rank structural carbon steel that Q235, SS400 be representative and extension property, normal temperature and the low-temperature impact toughness of low alloy steel.
Concrete technical scheme is as follows:
High tenacity boracic structural carbon steel coiled sheet, contains carbon≤0.30% according to weight, silicon :≤0.50%, manganese :≤1.70%, phosphorus :≤0.035%, sulphur :≤0.035%, aluminium: 0.015～0.050%, and the boron of 8～50ppm, surplus is iron and trace impurity.
Further, also comprise niobium :≤0.050%, and/or, vanadium :≤0.050%, and/or, titanium :≤0.020%, and/or, nickel :≤0.40%, and/or, chromium≤0.50%, and/or, copper :≤0.40%.
The production method of above-mentioned high tenacity boracic structural carbon steel coiled sheet, comprises the steps:
(1) adopt two frame reversable mill roughing;
(2) carry out 7 frame hot continuous rollings;
(3) be rolled rear laminar flow cooling;
(4) batch.
， austenite recrystallization district and the multi-pass controlled rolling of non-recrystallization district further, comprising:
1180～1220 ℃ of heating;
Breaking down open rolling at 1150～1180 ℃;
Finish rolling open rolling at 1000 ℃～950 ℃;
Finish rolling finish to gauge at 900 ℃～800 ℃;
Roll rear laminar flow cooling or supper-fast cooling;
650 ℃～500 ℃ stop cooling and batch.
Further, described cooling employing water curtain laminar flow is cooling.
Further, 10 ℃～50 ℃/S of water-cooled speed.
Compare with currently available technology, after mode of the present invention is improved, add 8～50ppm boron, and adjust after hot rolling and process for cooling parameter, make the mechanical property of the above thick specification structural carbon steel of 20mm and low alloy steel meet the requirement of GB/T700, avoided the generation of above-mentioned defect.Meanwhile, guaranteed coiled sheet open flat after, the service check result of the tension specimen of and vertical direction parallel along rolling direction does not decline.Boron has been widely used in high tensile steel plate and mild steel plate carries product, and carbon aluminium-killed steel strip as cold rolling in continuous annealing, steel plate, high tensile pipeline steel and non orientating silicon steel etc. are drawn in hot rolling as thin as a wafer; But the application in structural carbon steel and low alloy steel is comparatively rare.Ma Gang is applied to trace B in structural carbon steel and low alloy steel, to have obtained good effect.Make to comprise that the mechanical property of the structural carbon steel of 20.0～25.4mm thickness specification not only meets the requirement of GB/T700, avoided that extension property is not enough, strength property is not enough, the generation of the above-mentioned defect such as banded structure and stretching or impact fracture layering, and, can also obtain considerably beyond average normal temperature and low-temperature impact toughness, good isotropic performance.
1) according to measure of the present invention, process, make structural carbon steel coiled sheet there is good low-temperature impact toughness.
2) according to measure of the present invention, process, make organizing of structural carbon steel and low alloy steel coiled sheet very even, without preferred orientation, without fracture layering.
3) after coiled sheet is opened and put down, longitudinally mechanical property does not decline.
Accompanying drawing explanation
The metallographic structure of the industrial boracic structural carbon steel of Fig. 1 (with rolling direction vertical direction)
The metallographic structure of the industrial boracic structural carbon steel of Fig. 2 (along rolling direction parallel direction)
Embodiment
Describe the present invention with reference to the accompanying drawings below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
The chemical composition design that the present embodiment is used and rolling technology, process for cooling are applied to structural carbon steel and the low alloy steel of the yield strength 200-420MPa of the standard specificationss such as current GB700, JIS G3101, JIS G3109, the homogeneity of tissue and performance be can significantly improve, toughness and levels of ductility improved.
For this reason, the main points of scheme are: first, carbon content is less than 0.30%, can adopt the Ultra-low carbon design that is less than 0.06%, also can not adopt Ultra-low carbon design and adopt higher than 0.06%, until the design of the highest 0.30% carbon content still can obtain uniform microstructure, to avoid the layering of banded structure and stretching fracture, impact fracture; Second, can adopt elements such as adding Nb, V, Ti to carry out microalloying design, also can not adopt the elements such as Nb, V, Ti to carry out microalloying design to improve normal temperature and the low-temperature impact toughness of yield strength 200-420MPa rank structural carbon steel and low alloy steel; The 3rd, design rolling, process for cooling, the methods such as comprehensive microalloying, solution strengthening and build up, acquisition be take acicular ferrite as main heterogeneous structure, or obtain ' polygonal ferrite+quasi-polygonal ferrite+a small amount of perlite ' and, to improve intensity, plasticity and extension property, adapt to the diversified performance requirement of different yield strength grades, 25.4mm and following different thickness hot-rolled sheet coil from 200MPa to 420MPa.
High tenacity boracic structural carbon steel and low alloy steel coiled sheet chemical composition design are:
Carbon≤0.30%; Silicon :≤0.50%; Manganese :≤1.70%; Phosphorus :≤0.035%; Sulphur :≤0.035%; Aluminium: 0.015～0.050%; Boron: 8～50ppm.
According to different properties, require can select to add or can select not add lower column element: niobium :≤0.050%; Vanadium :≤0.050%; Titanium :≤0.020%; Nickel :≤0.40%; Chromium≤0.50%; Copper :≤0.40%.
Iron and trace impurity: surplus.
The cooling controlling and rolling controlling process system of high tenacity boracic structural carbon steel and low alloy steel coiled sheet is:
1. rolling pass is distributed: adopt two frame reversable mill roughing, carry out 7 frame hot continuous rollings again, be finally rolled rear laminar flow cooling, batch.In austenite recrystallization district and the multi-pass controlled rolling of non-recrystallization district, the rear laminar flow of (1180～1220 ℃) heating-(1150～1180) ℃ breaking down open rolling-(1000 ℃～950 ℃) finish rolling open rolling-(900 ℃～800 ℃) finish rolling finish to gauge-roll cooling or supper-fast cooling-(650 ℃～500 ℃) stop cooling and batch.
2. the type of cooling: water curtain laminar flow is cooling, 10 ℃～50 ℃/S of water-cooled.
The TMCP process system of high tenacity boracic structural carbon steel and low alloy steel coiled sheet according to being:
Thermo-mechanical rolling (TMCP) is to take the metallurgical technologies such as recrystallize, phase transformation as basis, makes rolling state plate property reach optimizing.For economizing on resources, reduce the add-on of alloying element, optimize structural carbon steel and low alloy steel coiled sheet microstructure, avoid banded structure, fracture lamination defect, obtain high-caliber toughness, and the rational Match of intensity and toughness, the present invention gives full play to the rolling power of seven frame hot continuous rolling units and rolls rear cooling power, and combine with boron micro-alloyed design, the distortion by high temperature austenite district Deformation recrystallization, low temperature austenite non-recrystallization district and roll after acceleration coolingly obtain the target that microstructure and mechanical property are optimized in expection.
Trace B has segregation effect on austenite grain boundary, can suppress ferritic forming core, and C curve is moved to right, and suppresses pearlitic transformation.Its mechanism of action is: (1) boron segregation is at austenite grain boundary, the position that has reduced crystal boundary energy and reduced the preferential forming core of ferrite.(2) boron reduces self spread coefficient of iron on crystal boundary, has reduced ferritic forming core speed.(3) boron segregation, after crystal boundary, occupies the position of preferential forming core.(4) along crystal boundary, form tiny boride and, adhesion coherent with matrix, make ferrite be difficult to forming core on the interface between boride and matrix.
Boron has been widely used in high tensile steel plate and mild steel plate carries product, and carbon aluminium-killed steel strip as cold rolling in continuous annealing, steel plate, high tensile pipeline steel and non orientating silicon steel etc. are drawn in hot rolling as thin as a wafer; But the application in structural carbon steel and low alloy steel is comparatively rare.Patent of the present invention is applied to trace B in structural carbon steel and low alloy steel, when adopting acicular ferrite structure or ' polygonal ferrite+quasi-polygonal ferrite+a small amount of perlite ', and making grain refining can homogeneity of structure more outstanding than the common high tenacity boracic structural carbon steel that does not add boron and low alloy steel coiled sheet or opening plate performance, the extension property of material, normal temperature and low-temperature impact toughness, the banded degree of microstructure have all obtained comprehensive improvement.
In preferred embodiment, chemical composition is as shown in table 1.Compare with common SS400, add the boron of 15～25ppm.
The chemical composition of table 1 SS400 (smelting component) requires (%)
The significant parameter of hot rolling technology is as shown in table 2.
Table 2 trial-production temperature parameter scheme
| Trial-production temperature parameter | Trial-production design |
| Tapping temperature | 1200℃ |
| Finish rolling F1 entrance target temperature | FET≤1050℃ |
| Intermediate blank target thickness | 60mm |
| Finishing temperature | 880±15℃ |
| Coiling temperature | 620±15℃ |
After production testing, the mechanical property of coiled sheet is as shown in table 3.Mechanical property corresponding to the opening plate of coiled sheet is as shown in table 4, impact property is as shown in table 5.
Longitudinal mechanical property of table 3 SS400 hot rolled coil
Longitudinal mechanical property of table 4 SS400 opening plate
The impact property of table 5 SS400 opening plate
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (6)
1. high tenacity boracic structural carbon steel coiled sheet, is characterized in that, contains carbon≤0.30%, silicon :≤0.50% according to weight, manganese :≤1.70%, phosphorus :≤0.035%, sulphur :≤0.035%, aluminium: 0.015～0.050%, and the boron of 8～50ppm, surplus is iron and trace impurity.
2. high tenacity boracic structural carbon steel coiled sheet as claimed in claim 1, is characterized in that, also comprises niobium :≤0.050%, and/or, vanadium :≤0.050%, and/or, titanium :≤0.020%, and/or, nickel :≤0.40%, and/or, chromium≤0.50%, and/or, copper :≤0.40%.
3. the production method of high tenacity boracic structural carbon steel coiled sheet as claimed in claim 1 or 2, is characterized in that, comprises the steps:
(1) adopt two frame reversable mill roughing;
(2) carry out 7 frame hot continuous rollings;
(3) be rolled rear laminar flow cooling;
(4) batch.
4. the production method of high tenacity boracic structural carbon steel coiled sheet as claimed in claim 3, is characterized in that ， austenite recrystallization district and the multi-pass controlled rolling of non-recrystallization district, comprising:
1180～1220 ℃ of heating;
Breaking down open rolling at 1150～1180 ℃;
Finish rolling open rolling at 1000 ℃～950 ℃;
Finish rolling finish to gauge at 900 ℃～800 ℃;
Roll rear laminar flow cooling or supper-fast cooling;
650 ℃～500 ℃ stop cooling and batch.
5. the production method of high tenacity boracic structural carbon steel coiled sheet as described in claim 3 or 4, is characterized in that, described cooling employing water curtain laminar flow is cooling.
6. the production method of high tenacity boracic structural carbon steel coiled sheet as claimed in claim 5, is characterized in that 10 ℃～50 ℃/S of water-cooled speed.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103966502A (en) * | 2014-05-15 | 2014-08-06 | 河北钢铁股份有限公司唐山分公司 | Low-cost yield strength 400MPa-grade steel strip and production method thereof |
| CN105543708A (en) * | 2016-03-14 | 2016-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Carbon structural steel and smelting method thereof |
| CN105734422A (en) * | 2016-03-24 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of hot-rolled steel strip for cold-rolled thin-walled tube |
| CN105779888A (en) * | 2016-03-14 | 2016-07-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolling production method for carbon structural steel |
| CN105803310A (en) * | 2016-03-24 | 2016-07-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled steel strip for cold-rolled thin-wall pipe and smelting method of hot-rolled steel strip |
| CN106011633A (en) * | 2016-07-21 | 2016-10-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled steel belt used for Q235-level anti-seismic structure and preparation method of hot-rolled steel belt |
| CN109706404A (en) * | 2019-02-27 | 2019-05-03 | 山东钢铁股份有限公司 | A kind of titaniferous carbon steel and its production method |
| CN111270140A (en) * | 2020-03-12 | 2020-06-12 | 本钢板材股份有限公司 | Production method for improving transverse crease defect of Q235B hot-rolled steel coil |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021495A (en) * | 2010-12-16 | 2011-04-20 | 马鞍山钢铁股份有限公司 | 420 MPa weatherproof bridge steel with high ductility and method for manufacturing hot rolled coil of 420 MPa weatherproof bridge steel with high ductility |
| CN102041443A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Low-alloy Q345D-Z25 medium plate and production process thereof |
| CN102899553A (en) * | 2012-09-12 | 2013-01-30 | 首钢总公司 | Novel boron-containing hot rolled coil and production method thereof |
-
2013
- 2013-12-06 CN CN201310655113.0A patent/CN103627951B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021495A (en) * | 2010-12-16 | 2011-04-20 | 马鞍山钢铁股份有限公司 | 420 MPa weatherproof bridge steel with high ductility and method for manufacturing hot rolled coil of 420 MPa weatherproof bridge steel with high ductility |
| CN102041443A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Low-alloy Q345D-Z25 medium plate and production process thereof |
| CN102899553A (en) * | 2012-09-12 | 2013-01-30 | 首钢总公司 | Novel boron-containing hot rolled coil and production method thereof |
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| CN103966502B (en) * | 2014-05-15 | 2016-04-13 | 河北钢铁股份有限公司唐山分公司 | Low cost yield strength 400MPa level steel band and production method thereof |
| CN103966502A (en) * | 2014-05-15 | 2014-08-06 | 河北钢铁股份有限公司唐山分公司 | Low-cost yield strength 400MPa-grade steel strip and production method thereof |
| CN105543708A (en) * | 2016-03-14 | 2016-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Carbon structural steel and smelting method thereof |
| CN105779888A (en) * | 2016-03-14 | 2016-07-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolling production method for carbon structural steel |
| CN105779888B (en) * | 2016-03-14 | 2017-09-29 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of hot rolling production method of carbon structural steels |
| CN105734422B (en) * | 2016-03-24 | 2018-06-05 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of the effective hot rolled strip of cold rolling thin-walled |
| CN105734422A (en) * | 2016-03-24 | 2016-07-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of hot-rolled steel strip for cold-rolled thin-walled tube |
| CN105803310A (en) * | 2016-03-24 | 2016-07-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled steel strip for cold-rolled thin-wall pipe and smelting method of hot-rolled steel strip |
| CN105803310B (en) * | 2016-03-24 | 2017-10-24 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of cold rolling light-wall pipe hot rolled strip and its smelting process |
| CN106011633A (en) * | 2016-07-21 | 2016-10-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled steel belt used for Q235-level anti-seismic structure and preparation method of hot-rolled steel belt |
| CN106011633B (en) * | 2016-07-21 | 2018-01-26 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of Q235 levels anti-seismic structure hot rolled strip and preparation method thereof |
| CN109706404A (en) * | 2019-02-27 | 2019-05-03 | 山东钢铁股份有限公司 | A kind of titaniferous carbon steel and its production method |
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