CN101906519A - Method for manufacturing low yield ratio surface layer ultra-fine grain low carbon steel thick plate - Google Patents
Method for manufacturing low yield ratio surface layer ultra-fine grain low carbon steel thick plate Download PDFInfo
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- CN101906519A CN101906519A CN2009100119607A CN200910011960A CN101906519A CN 101906519 A CN101906519 A CN 101906519A CN 2009100119607 A CN2009100119607 A CN 2009100119607A CN 200910011960 A CN200910011960 A CN 200910011960A CN 101906519 A CN101906519 A CN 101906519A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910001209 Low-carbon steel Inorganic materials 0.000 title claims abstract description 11
- 239000002344 surface layer Substances 0.000 title claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 7
- 238000005338 heat storage Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 21
- 239000010959 steel Substances 0.000 description 21
- 238000005516 engineering process Methods 0.000 description 14
- 239000013078 crystal Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000008520 organization Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910008455 Si—Ca Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention provides a method for manufacturing a low-yield-ratio surface-layer ultrafine-grained low-carbon steel thick plate, which comprises smelting, continuous casting and rolling, and is characterized in that a billet is heated at 1050-1180 ℃ before rolling, two-stage rolling is adopted, the rolling temperature of the first stage is controlled to be more than or equal to 1000 ℃, the thickness of an intermediate billet is more than 2.5 times of the thickness of a finished product, cooling is accelerated after rolling to reduce the temperature of the surface of the intermediate billet to 350-550 ℃, the cooling speed is more than or equal to 20 ℃/S, then the temperature is kept, when the temperature rises to the maximum 730-800 ℃, the second stage rolling is directly carried out, the final rolling temperature is controlled to be 680-750 ℃, then secondary cooling is carried out, and the thickness of. The invention has simple manufacturing process, does not need complex heat treatment procedures, can obtain the surface layer ultrafine block ferrite structure by depending on the self heat storage of the intermediate blank, reduces the production cost, shortens the production period, is suitable for the production of thick plates, and has high strength, high toughness and low yield ratio.
Description
Technical field
The invention belongs to the metallic substance technical field, relate in particular to a kind of manufacture method with surface layer ultra fine grain low-carbon steel thick plate of low yield strength ratio.
Background technology
In the middle of all improved the measure of steel performance, grain refining was only plasticity and the flexible reinforcement means of not reducing when improving intensity, is to guarantee that steel obtain the Best Technical Approach of high resistance to fracture, anti-fatigue performance and good low-temperature flexibility.Carried out number of research projects at the microstructure ultra-fining treatment mechanism of steel both at home and abroad, wherein, deformation induced (reinforcement) ferrite transformation, ferrite dynamic recrystallization theory is accepted by people gradually.These theoretical industrial application have obtained good effect at hot continuous rolling coiled sheet and long profiles production, realize short-track minor tick and low temperature gross distortion on the technology easily, the part afterflow that course of hot rolling produces can be released, cooling fast after the finish to gauge, thereby the easy refinement of ferrite crystal grain.By comparison, because Heavy Plate Production process automation degree is low, rolling pass is long pitch time, on whole thickness direction, be difficult to satisfy big deformation and high conditions such as speed of cooling, the structure refinement of plate of moderate thickness is very difficult, so can only realize structure refinement by improving cooling controlling and rolling controlling process.But the degree of present TMCP technology crystal grain thinning is very limited, and the ferrite particle diameter that is obtained is limited to 5 μ m.
Application number is 2006100219038.7, " manufacture method of low yield strength ultrafine grain belt steel " by name, application number is 200610040735.2, " a kind of preparation method of micro-alloy superfine crystal grain hot-rolled steel plate " by name and the patent No. are 03156179.9, the Chinese patent of " a kind of controlled rolling method of super fine organization soft steel " by name all is the research to hot-rolled coil (thin plate) super fine organization of thickness below 20mm, utilize the precipitated phase intracrystalline forming core and the deformation induced ferrite transformation technology of microalloy element, adopt the thin plate continuous rolling process, obtain ultra-fine crystal hot-rolled steel plate, average grain size is below 4 μ m.But, do not describe for the structure refinement technology of the steel plate of thickness 〉=20mm.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, remedy the blank that existing process for producing thick plate can't be produced the superfine crystal particle plate of moderate thickness, provide a kind of technology of on existing thick slab production plants, utilizing intermediate blank to cool off fast+rise again to be rolled to obtain the production method of surface layer ultra fine grain slab.
The present invention is achieved in that the manufacture method of this low yield ratio surface layer ultra fine grain low-carbon steel thick plate comprises smelting, continuous casting and rolling, billet heating temperature is 1050～1180 ℃ before being characterized in rolling, adopt two stage rolling, the fs rolling temperature is controlled at 〉=and 1000 ℃, the thickness of intermediate blank is more than 2.5 times of finished product thickness, roll after-acceleration cooling and make intermediate blank surface cooling to 350 ℃～550 ℃, speed of cooling 〉=20 ℃/S, treat temperature subsequently, when temperature recovery to the highest 730～800 ℃, it is rolling directly to carry out subordinate phase, finishing temperature is controlled at 680～750 ℃, carry out the secondary cooling subsequently, finished product thickness 〉=20mm.
The described secondary cooling of the manufacture method of low-carbon steel thick plate of the present invention can be adopted water-cooled, and its speed of cooling is 1～20 ℃/s, and final cooling temperature is 500～600 ℃, afterwards air cooling; Also can directly adopt air cooling.
The described Plate Steel of the manufacture method of low-carbon steel thick plate of the present invention is an essential characteristic with low C, with Mn element with low cost as main adding elements, its chemical component weight per-cent is: C:0.08%～0.20%, Si:0.20%～0.40%, Mn:1.20%～1.80%, Als:0.010%～0.050%, surplus are Fe and unavoidable impurities.
Production method of the present invention is carried out pre-treatment to molten iron; Adopt converter smelting, by top blast or top bottom blowing, dark as far as possible decarburization; Adopt VD, RH, LF etc. to carry out refining treatment, Ca handles, and in conjunction with S content and tap in the steel, feeds the Si-Ca line, and the control oxide morphology improves ductility and toughness, reduces the horizontal and vertical poor performance of steel plate; Continuous casting adopts induction stirring, reduces element segregation.
Steel grade of the present invention with Mn element with low cost as main adding elements, do not contain any microalloy element, manufacturing process is simple, need not the complicated heat treatment program, rely on intermediate blank self accumulation of heat just can obtain the blocky ferritic structure of the surface layer ultra fine (average grain size at top layer 1mm place≤0.7 μ m, average grain size≤1 μ m apart from 2mm place, steel plate top layer, average grain size≤3 μ m apart from 4mm place, steel plate top layer), both reduced production cost, shorten the production cycle again, be suitable for slab production; The present invention (in tensile strength 〉=500MPa), the high tenacity, can also be controlled at yield tensile ratio below 0.8 guaranteeing to have high strength.Compare with the rolling technology of routine, steel plate does not change along the thickness direction core structure, is ferrite+pearlitic structure, so this technology is little to the original welding property influence of steel plate, and has good low-temperature flexibility and stops the crack propagation ability.
Description of drawings
The graphic representation that the grain fineness number that accompanying drawing 1 obtains for the present invention changes along the steel plate thickness direction.
Accompanying drawing 2 is the Plate Steel figure of textura epidermoidea of the present invention.
Accompanying drawing 3 is Plate Steel core structure figure of the present invention.
Accompanying drawing 4 is Plate Steel of the present invention top layer microcosmic TEM organization chart.
Accompanying drawing 5 is Plate Steel low-temperature flexibility graphic representation of the present invention.
Accompanying drawing 6 is Plate Steel crack growth rate graphic representation of the present invention.
Embodiment
The present invention is further described by the following embodiment.
The chemical ingredients of the embodiment of the invention sees Table 1, and its rolling technology sees Table 2, rolls the attitude mechanical property and sees Table 3.Adopt production method of the present invention little as can be seen from Table 3 to the traditional performance influence of steel plate.
Fig. 5 shows with the rolling Plate Steel of production method of the present invention to have good low-temperature flexibility, and for the impact specimen that is of a size of 5 * 10 * 55mm, the ballistic work on steel plate top layer still is higher than the 30J of heart portion (state under the common process) at-100 ℃.
Adopt the rolling Plate Steel of production method of the present invention to have high prevention fatigue crack growth ability, as shown in Figure 6, total trend is that the da/dN of pair rolling steel plate will be faster than adopting the rolling steel plate of this technology.The technology that crack growth rate is adopted from high to low is followed successively by common process, this technology air cooling, this technology water-cooled.
The smelting composition (Wt%) of table 1 embodiment of the invention steel grade
| Embodiment | C | Si | Mn | Als |
| 1 | 0.08 | 0.35 | 1.40 | 0.034 |
| 2 | 0.16 | 0.2 | 1.80 | 0.050 |
| 3 | 0.10 | 0.23 | 1.42 | 0.035 |
| 4 | 0.10 | 0.27 | 1.50 | 0.041 |
| 5 | 0.18 | 0.2 | 1.43 | 0.042 |
*：Pcm＝C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B
Table 2 embodiment of the invention rolling technology
The mechanical property of table 3 embodiment of the invention
Claims (4)
1. the manufacture method of a low yield ratio surface layer ultra fine grain low-carbon steel thick plate, comprise smelting, continuous casting and rolling, billet heating temperature is 1050～1180 ℃ before it is characterized in that rolling, adopt two stage rolling, the fs rolling temperature is controlled at 〉=and 1000 ℃, the thickness of intermediate blank is more than 2.5 times of finished product thickness, roll after-acceleration cooling and make intermediate blank surface cooling to 350 ℃～550 ℃, speed of cooling 〉=20 ℃/S are treated temperature subsequently, when temperature recovery to the highest 730～800 ℃, it is rolling directly to carry out subordinate phase, finishing temperature is controlled at 680～750 ℃, carries out the secondary cooling subsequently, finished product thickness 〉=20mm.
2. the manufacture method of low-carbon steel thick plate according to claim 1 is characterized in that described secondary cooling employing water-cooled, and its speed of cooling is 5～20 ℃/s, and final cooling temperature is 500～600 ℃, afterwards air cooling.
3. the manufacture method of low-carbon steel thick plate according to claim 1 is characterized in that directly employing air cooling of described secondary cooling.
4. the manufacture method of low-carbon steel thick plate according to claim 1, the chemical component weight per-cent that it is characterized in that described Plate Steel is: C:0.08%～0.20%, Si:0.20%～0.40%, Mn:1.20%～1.80%, Als:0.010%～0.050%, surplus are Fe and unavoidable impurities.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100119607A CN101906519A (en) | 2009-06-08 | 2009-06-08 | Method for manufacturing low yield ratio surface layer ultra-fine grain low carbon steel thick plate |
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| CN2009100119607A CN101906519A (en) | 2009-06-08 | 2009-06-08 | Method for manufacturing low yield ratio surface layer ultra-fine grain low carbon steel thick plate |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162024A (en) * | 2010-12-13 | 2011-08-24 | 河北省首钢迁安钢铁有限责任公司 | Method for eliminating coarse grains on surface layer of low-carbon aluminum killed steel |
| CN102828116A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | TMCP (thermal mechanical control processing) process-based surface-layer ultrafine-grain high-strength steel plate and manufacturing method thereof |
| CN103785695A (en) * | 2014-01-21 | 2014-05-14 | 首钢总公司 | Controlling method for lowering yield ratio of low-carbon cold heading steel |
| CN104018060A (en) * | 2014-05-23 | 2014-09-03 | 内蒙古包钢钢联股份有限公司 | Guaranteed crack detection and guaranteed performance Q345B steel plate with thickness of 150mm and production method thereof |
| CN104694850A (en) * | 2015-03-12 | 2015-06-10 | 东北大学 | Thick steel plate with excellent rack arrest property and preparation method of thick steel plate |
| CN105220069A (en) * | 2015-10-14 | 2016-01-06 | 南京钢铁股份有限公司 | A kind of nearly table Ultra-fine Grained super low carbon microalloy high strength steel Wide and Thick Slab and method for making thereof |
| CN106140815A (en) * | 2016-08-30 | 2016-11-23 | 华北理工大学 | A kind of milling method of ultra-thick plate |
| CN106676240A (en) * | 2016-12-22 | 2017-05-17 | 钢铁研究总院 | Manufacturing method of low alloy steel thick plate with surface-layer ultra-fine grain ferrite |
| CN108070789A (en) * | 2018-01-17 | 2018-05-25 | 山东钢铁集团日照有限公司 | The special thick steel of not less than 480MPa grades Ultra-fine Graineds of yield strength and preparation method |
| CN113073262A (en) * | 2021-03-24 | 2021-07-06 | 东北大学 | Double-gradient ultrafine-grained steel plate with excellent ultralow-temperature toughness and preparation method thereof |
| CN115323265A (en) * | 2022-07-15 | 2022-11-11 | 南京钢铁股份有限公司 | Ultra-fine grain steel plate and preparation method thereof |
-
2009
- 2009-06-08 CN CN2009100119607A patent/CN101906519A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162024A (en) * | 2010-12-13 | 2011-08-24 | 河北省首钢迁安钢铁有限责任公司 | Method for eliminating coarse grains on surface layer of low-carbon aluminum killed steel |
| CN102162024B (en) * | 2010-12-13 | 2012-07-25 | 河北省首钢迁安钢铁有限责任公司 | Method for eliminating coarse grains on surface layer of low-carbon aluminum killed steel |
| CN102828116A (en) * | 2011-06-14 | 2012-12-19 | 鞍钢股份有限公司 | TMCP (thermal mechanical control processing) process-based surface-layer ultrafine-grain high-strength steel plate and manufacturing method thereof |
| CN103785695B (en) * | 2014-01-21 | 2015-09-30 | 首钢总公司 | A kind of control method reducing low-carbon cold heading steel yield tensile ratio |
| CN103785695A (en) * | 2014-01-21 | 2014-05-14 | 首钢总公司 | Controlling method for lowering yield ratio of low-carbon cold heading steel |
| CN104018060A (en) * | 2014-05-23 | 2014-09-03 | 内蒙古包钢钢联股份有限公司 | Guaranteed crack detection and guaranteed performance Q345B steel plate with thickness of 150mm and production method thereof |
| CN104694850A (en) * | 2015-03-12 | 2015-06-10 | 东北大学 | Thick steel plate with excellent rack arrest property and preparation method of thick steel plate |
| CN105220069A (en) * | 2015-10-14 | 2016-01-06 | 南京钢铁股份有限公司 | A kind of nearly table Ultra-fine Grained super low carbon microalloy high strength steel Wide and Thick Slab and method for making thereof |
| CN106140815A (en) * | 2016-08-30 | 2016-11-23 | 华北理工大学 | A kind of milling method of ultra-thick plate |
| CN106676240A (en) * | 2016-12-22 | 2017-05-17 | 钢铁研究总院 | Manufacturing method of low alloy steel thick plate with surface-layer ultra-fine grain ferrite |
| CN108070789A (en) * | 2018-01-17 | 2018-05-25 | 山东钢铁集团日照有限公司 | The special thick steel of not less than 480MPa grades Ultra-fine Graineds of yield strength and preparation method |
| CN113073262A (en) * | 2021-03-24 | 2021-07-06 | 东北大学 | Double-gradient ultrafine-grained steel plate with excellent ultralow-temperature toughness and preparation method thereof |
| CN115323265A (en) * | 2022-07-15 | 2022-11-11 | 南京钢铁股份有限公司 | Ultra-fine grain steel plate and preparation method thereof |
| CN115323265B (en) * | 2022-07-15 | 2024-03-19 | 南京钢铁股份有限公司 | Superfine crystal steel plate and preparation method thereof |
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Application publication date: 20101208 |