CN1431059A - Method for mfg. hot rolled steel plate possessing superfine crystal grains and hot rolled steel plate produced - Google Patents
Method for mfg. hot rolled steel plate possessing superfine crystal grains and hot rolled steel plate produced Download PDFInfo
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- CN1431059A CN1431059A CN 03117280 CN03117280A CN1431059A CN 1431059 A CN1431059 A CN 1431059A CN 03117280 CN03117280 CN 03117280 CN 03117280 A CN03117280 A CN 03117280A CN 1431059 A CN1431059 A CN 1431059A
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Abstract
A technology for manufacturing hot-rolled steel plate with superfine grains is disclosed. The said steel plate contains C (0.1-0.16 wt.%), Si (0.12-0.3 wt.%), Mn (0.45-0.65 wt.%), P (0-0.020 wt.%) and S (0-0.015 wt.%). Its technological steps include casing, heating to 1200-1230 deg.c, coarse rolling, and three-pass fine rolling. Its advantages are superfine crystal grain (3-6 microns), excellent properties and simple chemical components.
Description
Technical field
The present invention relates to a kind of hot rolled steel plate and production method thereof, the especially a kind of production method of the hot rolled steel plate with ultra-fine grain and the hot rolled steel plate of manufacturing thereof.
Background technology
The crystal grain of refinement steel is unique methods that can improve intensity and toughness simultaneously, and in recent years, countries in the world are all in the method for constantly exploring crystal grain thinning.At present, the minimum ferrite grain size of industrial carbon steel is 20 μ m on the traditional hot tandem mill, and its tensile strength is 400MPa.Korea S and Japan and other countries have been studied under laboratory condition, and the ferrite grain size of low carbon manganese steel is refine to the method for 1 μ m, and domestic steel mill has gone out the hot rolled steel plate of ferrite and bainite structure with low-carbon high-manganese steel constitution industrial production.But,, on traditional continuous hot-rolling mill, obtain the ferrite of ultra-fine grain and the hot rolled steel plate and the production technology thereof of pearlitic structrure studied with the carbon steel of the low manganese content of low-carbon (LC) both at home and abroad so far not under big industrial production condition.
Summary of the invention
Can not be on traditional continuous hot-rolling mill obtain the deficiency of the hot rolled steel plate of the ferrite of ultra-fine grain and pearlitic structrure in order to overcome existing production technology with the carbon steel of the low manganese content of low-carbon (LC), the invention provides a kind ofly on traditional continuous hot-rolling mill, obtain the production method of carbon steel hot rolled steel plate of the low manganese content of low-carbon (LC) of the ferrite of ultra-fine grain and pearlitic structrure and the carbon steel hot rolled steel plate of the low manganese content of low-carbon (LC) thereof.
The technical solution adopted for the present invention to solve the technical problems is: a kind of production method with hot rolled steel plate of ultra-fine grain, the continuous casting steel billet of carbon steel is heated to 1200～1230 ℃, after described continuous casting steel billet carried out roughing, carry out finish rolling again, it is characterized in that: the finishing mill inlet temperature of above-mentioned finish rolling is 870～900 ℃, the drafts of finish rolling first passage is 13～16mm, and the drafts of finish rolling second passage is 8～10mm, and the drafts of finish rolling the 3rd passage is 5～7mm.
A kind of usefulness has the hot rolled steel plate that the production method of the hot rolled steel plate of ultra-fine grain is made, adopt the chemical analysis of low-carbon (LC) low manganess steel, its percentage by weight is: C:0.10～0.16%, Si:0.12～0.30%, Mn:0.45～0.65%, P :≤0.020%, S :≤0.015%, its microscopic structure is ferrite and pearlite, it is characterized in that: described ferritic average grain size is 3～6 μ m.
The invention has the beneficial effects as follows, by adopting lower heating-up temperature, the refinement original austenite grains, and control finishing mill inlet temperature, go out ultra-fine ferrite crystal grain by the bigger deformation inductdion of finish rolling previous three passes, on traditional hot-rolling mill, the carbon steel hot rolled steel plate of the low manganese content of low-carbon (LC) of the ferrite of acquisition ultra-fine grain and pearlitic structrure, the ferrite average grain size is 3～6 μ m, and the mechanical property of hot rolled steel plate is: σ
s〉=370MPa, σ
b〉=510MPa, δ
5〉=30%, have excellent comprehensive performances such as intensity height, percentage elongation height and yield tensile ratio that the hot rolled steel plate of ultra-fine grain has be low, also have simple, the manageable advantage of chemical analysis of steel simultaneously.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the metallographic structure photo of the hot rolled steel plate of the present invention with ultra-fine grain.
The specific embodiment
As shown in Figure 1, production method with hot rolled steel plate of ultra-fine grain, it is the continuous casting steel billet that the carbon steel of the low manganese content of carbon steel especially low-carbon (LC) is poured into 200 * (800～1200) * 5500mm with conventional continuous cast method, continuous casting steel billet is heated to 1200～1230 ℃ in heating furnace, by adopting above-mentioned lower heating-up temperature (conventional at present billet heating temperature is 1230～1250 ℃), refinement original austenite grains.Continuous casting steel billet after the heating is delivered on the 1450mm continuous hot-rolling mill and is rolled, carry out finish rolling after the roughing again, and the finishing mill inlet temperature of control finish rolling is 870～900 ℃, the drafts of finish rolling first passage is 13～16mm, the drafts of finish rolling second passage is 8～10mm, the drafts of finish rolling the 3rd passage is 5～7mm, at lower final rolling temperature with than inducing ultra-fine ferrite crystal grain under the heavy reduction.Adopt the above-mentioned finish rolling previous three passes drafts of the present invention, the influence of ferrite average grain size is seen Table 1 in different finish rolling inlet temperatures; The contrast situation of the drafts of prior art and drafts of the present invention sees Table 2.
The various finish rolling inlet temperatures of table 1 are to the influence of ferrite average grain size
| Kind | The finish rolling inlet temperature, ℃ | ||||
| ??1000 | ?950 | ?930 | ?900 | ?870 | |
| The ferrite average grain size, μ m | ??13～15 | ?10～12 | ?7～9 | ?5～6 | ?3～5 |
The drafts of table 2 prior art and the contrast table of drafts of the present invention
| Kind | Each frame of finishing mill | |||||
| The first frame F1 | The second frame F2 | The 3rd frame F3 | The 4th frame F4 | The 5th frame F5 | The 6th frame F6 | |
| The prior art drafts, mm | ?10～12 | ??6～8 | ??4～6 | ??1～4 | ??1～4 | ??1～4 |
| Drafts of the present invention, mm | ?13～16 | ??8～10 | ??5～7 | ??1～4 | ??0.1～2 | ??0.1～2 |
Hot rolled steel plate with the aforementioned production method manufacturing, adopt the chemical analysis of low-carbon (LC) low manganess steel, its percentage by weight is: C:0.10～0.16%, Si:0.12～0.30%, Mn:0.45～0.65%, P :≤0.020%, S :≤0.015%, its microscopic structure is ferrite and pearlite, and ferritic average grain size is 3～6 μ m.The mechanical property of this hot rolled steel plate is: σ
s〉=370MPa, σ
b〉=510MPa, δ
5〉=30%, the hot rolled steel plate of ultra-fine grain has excellent comprehensive performances.
Embodiment: production method with hot rolled steel plate of ultra-fine grain, it is the continuous casting steel billet that the carbon steel of the low manganese content of carbon steel especially low-carbon (LC) is poured into 200 * (800～1200) * 5500mm with conventional continuous cast method, continuous casting steel billet is heated to 1200～1230 ℃ in heating furnace, by adopting above-mentioned lower heating-up temperature (conventional at present billet heating temperature is 1230～1250 ℃), the continuous casting steel billet after the heating is delivered on the 1450mm continuous hot-rolling mill be rolled.Roughing adopts eight passages rolling, and rolling temperature is 950～1100 ℃.Intermediate slab after the roughing enters finishing mill finish rolling, and the inlet temperature that control enters finishing mill is 870～900 ℃.Finish rolling adopts six passages rolling, the drafts of finish rolling first passage is 13～16mm, and the drafts of finish rolling second passage is 8～10mm, and the drafts of the 3rd passage is 5～7mm, by the bigger distortion of each passage of finish rolling, under lower final rolling temperature, induce ultra-fine ferrite crystal grain.Like this, the finish rolling inlet temperature that has just overcome in the existing finish-rolling process is higher, and the previous three passes drafts is little, and difficulty reaches by deformation inductdion and goes out the ferritic deficiency of ultra-fine grain.The rolling hot rolled steel plate of finishing is 800～830 ℃ by the temperature of finishing mill outlet.The coiling temperature of hot rolled steel plate is controlled at 590～620 ℃, grows up to suppress ultra-fine ferrite crystal grain.
The hot rolled steel plate that utilizes aforementioned production method to make, can adopt the chemical analysis of low-carbon (LC) low manganess steel, its percentage by weight is: C:0.10～0.16%, Si:0.12～0.30%, Mn:0.45～0.65%, P :≤0.020%, S :≤0.015%, on traditional hot-rolling mill, the carbon steel hot rolled steel plate of the low manganese content of low-carbon (LC) of the ferrite of acquisition ultra-fine grain and pearlitic structrure, its microscopic structure is ferrite and pearlite, and ferritic average grain size is 3～6 μ m, and the mechanical property of hot rolled steel plate is: σ
s〉=370MPa, σ
b〉=510MPa, δ
5〉=30%, have excellent comprehensive performances such as intensity height, percentage elongation height and yield tensile ratio that the hot rolled steel plate of ultra-fine grain has be low, its mechanical property sees Table 3.Table 3 has the mechanical property of 6 sub-samplings test of the low manganese hot rolled steel plate of low-carbon (LC) of ultra-fine grain
Wherein: σ
s-yield strength, σ
b-tensile strength, δ
5-percentage elongation, B-specimen width, α-angle of bend, a-bending diameter.
| Sequence number | σ s(MPa) | σ b(MPa) | σ s/?σ b | ?δ 5(％) | Clod wash B=35mm d=a, α=180 ° |
| 01 | ????400 | ????520 | ??0.769 | ????31 | Qualified |
| 02 | ????415 | ????540 | ??0.769 | ????35 | Qualified |
| 03 | ????430 | ????555 | ??0.775 | ????34 | Qualified |
| 04 | ????430 | ????510 | ??0.843 | ????33 | Qualified |
| 05 | ????415 | ????545 | ??0.761 | ????32 | Qualified |
| 06 | ????410 | ????535 | ??0.766 | ????32 | Qualified |
Claims (5)
1, a kind of production method with hot rolled steel plate of ultra-fine grain, the continuous casting steel billet of carbon steel is heated to 1200～1230 ℃, after described continuous casting steel billet carried out roughing, carry out finish rolling again, it is characterized in that: the finishing mill inlet temperature of above-mentioned finish rolling is 870～900 ℃, the drafts of finish rolling first passage is 13～16mm, and the drafts of finish rolling second passage is 8～10mm, and the drafts of finish rolling the 3rd passage is 5～7mm.
2, the production method with hot rolled steel plate of ultra-fine grain as claimed in claim 1 is characterized in that: the finishing mill outlet temperature of described finish rolling is 800～830 ℃.
3, the production method with hot rolled steel plate of ultra-fine grain as claimed in claim 2 is characterized in that: the coiling temperature of described hot rolled steel plate is 590～620 ℃.
4, as claim 1,2 or 3 described production methods with hot rolled steel plate of ultra-fine grain, it is characterized in that: described roughing rolling temperature is 950～1100 ℃.
5, the hot rolled steel plate made of the production method of the hot rolled steel plate with ultra-fine grain as claimed in claim 1, adopt the chemical analysis of low-carbon (LC) low manganess steel, its percentage by weight is: C:0.10～0.16%, Si:0.12～0.30%, Mn:0.45～0.65%, P :≤0.020%, S :≤0.015%, its microscopic structure is ferrite and pearlite, it is characterized in that: described ferritic average grain size is 3～6 μ m.
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| CN 03117280 CN1203931C (en) | 2003-02-09 | 2003-02-09 | Method for mfg. hot rolled steel plate possessing superfine crystal grains and hot rolled steel plate produced |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007079625A1 (en) * | 2006-01-06 | 2007-07-19 | Angang Steel Company Limited | An ultrafine grain steel sheet produced by continuous casting and rolling a medium-thin slab and its manufacture process |
| CN1330930C (en) * | 2005-03-29 | 2007-08-08 | 东北大学 | Flexible measurement method for grain sizes of steel plate internal structure during rolling process |
| CN100345639C (en) * | 2005-12-21 | 2007-10-31 | 攀钢集团攀枝花钢铁研究院 | Manufacturing method of ultrafine crystal thin hot rolled steel plate and hot rolled steel plate produced thereby |
| CN100406604C (en) * | 2004-10-12 | 2008-07-30 | 昆明钢铁股份有限公司 | Dedicated base material for making nails and cold rolling reinforced steel bar with ribs |
| CN100406603C (en) * | 2004-10-12 | 2008-07-30 | 昆明钢铁股份有限公司 | Parent metal dedicated to cold rolled reinforcing steel bar with ribs |
| CN100425707C (en) * | 2005-12-15 | 2008-10-15 | 北京科技大学 | Method of improving mechanical performance of low carbon steel by tempered fast cooling |
| CN101107374B (en) * | 2005-01-18 | 2010-05-19 | 新日本制铁株式会社 | Bake-hardening hot-rolled steel sheet with excellent workability and process for producing the same |
| CN101899611A (en) * | 2010-08-27 | 2010-12-01 | 攀钢集团钢铁钒钛股份有限公司 | Structural hot rolled steel plate and production method thereof |
| CN103233108A (en) * | 2013-05-07 | 2013-08-07 | 唐山建龙实业有限公司 | Production process for improving strip-steel plain carbon steel strength |
| CN103572021A (en) * | 2013-11-05 | 2014-02-12 | 南京钢铁股份有限公司 | Method for controlling widmannstatten structure in upgrade of C-Mn steel |
| CN104611626A (en) * | 2013-11-05 | 2015-05-13 | 上海梅山钢铁股份有限公司 | Low-cost high-strength automobile wheel steel and production method thereof |
| CN105112775A (en) * | 2015-10-10 | 2015-12-02 | 攀钢集团攀枝花钢铁研究院有限公司 | High-formability hot-rolled steel plate and production method thereof |
-
2003
- 2003-02-09 CN CN 03117280 patent/CN1203931C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100406604C (en) * | 2004-10-12 | 2008-07-30 | 昆明钢铁股份有限公司 | Dedicated base material for making nails and cold rolling reinforced steel bar with ribs |
| CN100406603C (en) * | 2004-10-12 | 2008-07-30 | 昆明钢铁股份有限公司 | Parent metal dedicated to cold rolled reinforcing steel bar with ribs |
| CN101107374B (en) * | 2005-01-18 | 2010-05-19 | 新日本制铁株式会社 | Bake-hardening hot-rolled steel sheet with excellent workability and process for producing the same |
| CN101696483B (en) * | 2005-01-18 | 2013-06-12 | 新日铁住金株式会社 | Bake-hardening hot-rolled steel sheet with excellent workability and process for producing the same |
| CN1330930C (en) * | 2005-03-29 | 2007-08-08 | 东北大学 | Flexible measurement method for grain sizes of steel plate internal structure during rolling process |
| CN100425707C (en) * | 2005-12-15 | 2008-10-15 | 北京科技大学 | Method of improving mechanical performance of low carbon steel by tempered fast cooling |
| CN100345639C (en) * | 2005-12-21 | 2007-10-31 | 攀钢集团攀枝花钢铁研究院 | Manufacturing method of ultrafine crystal thin hot rolled steel plate and hot rolled steel plate produced thereby |
| WO2007079625A1 (en) * | 2006-01-06 | 2007-07-19 | Angang Steel Company Limited | An ultrafine grain steel sheet produced by continuous casting and rolling a medium-thin slab and its manufacture process |
| CN101899611A (en) * | 2010-08-27 | 2010-12-01 | 攀钢集团钢铁钒钛股份有限公司 | Structural hot rolled steel plate and production method thereof |
| CN103233108A (en) * | 2013-05-07 | 2013-08-07 | 唐山建龙实业有限公司 | Production process for improving strip-steel plain carbon steel strength |
| CN103572021A (en) * | 2013-11-05 | 2014-02-12 | 南京钢铁股份有限公司 | Method for controlling widmannstatten structure in upgrade of C-Mn steel |
| CN104611626A (en) * | 2013-11-05 | 2015-05-13 | 上海梅山钢铁股份有限公司 | Low-cost high-strength automobile wheel steel and production method thereof |
| CN105112775A (en) * | 2015-10-10 | 2015-12-02 | 攀钢集团攀枝花钢铁研究院有限公司 | High-formability hot-rolled steel plate and production method thereof |
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| CN1203931C (en) | 2005-06-01 |
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