CN1243884A - Controlled rolling technology for microally steel with superfine structure - Google Patents
Controlled rolling technology for microally steel with superfine structure Download PDFInfo
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- CN1243884A CN1243884A CN 99109124 CN99109124A CN1243884A CN 1243884 A CN1243884 A CN 1243884A CN 99109124 CN99109124 CN 99109124 CN 99109124 A CN99109124 A CN 99109124A CN 1243884 A CN1243884 A CN 1243884A
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Abstract
A controlled rolling technology for microalloy steel with superfine structure includes such technological steps as heating steel billet to 1150-1220 deg.C to dissolve microalloy elements fully, discharging from furnace, controlled rolling twice at 900-1150 deg.C with 20-40% of deformation for the first pass, strain induction rolling three passes at 800-840 deg.C with 30-50% of deformation for each pass, and quick cooling at the speed higher than 10 deg.C/S. The size of crystal grain for obtained microalloy steel is 0.9-1.2 microns. Its production cost is low.
Description
The invention belongs to steel alloy production technique field, be specially adapted to super fine organization micro-alloyed steel rolling controlling method.
Late nineteen eighties, the people such as YADA of Japan find when the C-Mn steel to 0.1C-1.0Mn carries out controlled rolling research, at the A of this steel
E3But the above 30-50 ℃ of ultra-fine ferrite of strain inducing when carrying out big dependent variable deformation tissue forms, and quickens to cool off as cooperating, just can obtain the super fine organization that ferrite grain size is 2-3 μ m again.By this method, people such as YADA pass through at A
E3More than the continuously fast speed rolling of 40 ℃ of six passage, successfully roll out the super fine organization that ferrite grain size is 2-3 μ m (H.Yada: external iron and steel 1989.3:21-28), middle nineteen nineties, people such as the SUNGHAK LEE of Korea S reduce the A of steel greatly by add 1.0Ni and 0.2Nb in the 0.1C-1.0Mn steel
E3Temperature, and then it is rolling that material is implemented the low temperature strain inducing, having obtained ferrite grain size is 1.1 μ m super fine organizations.(SUNGHAK?LEE，Metallurgical?and?Materials?Transactions?A.Volume?26A，May?1995：1093)。People's such as YADA technology is not considered the influence that the preceding microstructure evolution situation of finish rolling forms final tissue.Though people such as SUNGHAKLEE have considered the whole process of controlled rolling process, in steel, added 1.0Ni and 0.2Nb, increased the cost of material greatly.
The object of the present invention is to provide a kind of controlled rolling method of super fine organization micro-alloyed steel, can not only make the grain-size of micro-alloyed steel be refined to 0.9-1.2 μ m by this method, and can reduce the production cost of this type of super fine organization steel alloy greatly.
Based on above-mentioned purpose, the micro-alloyed steel chemical ingredients following (weight %) that the present invention adopts: C:0.08-0.12; Si:0.01-0.05; Mn:0.8-1.4; Nb:0.03-0.06; Ti:0.01-0.03; P:＜0.015; S≤0.01; Surplus is Fe.
The present invention adopts the main technique flow process of above-mentioned micro-alloyed steel composition production super fine organization steel plate as follows: heating--recrystallize controlled rolling--strain inducing is rolling---acceleration cooling.
At first, steel billet be heated to 1150 ℃-1220 ℃ so that Nb, micro alloying elements such as Ti fully dissolve, steel billet is come out of the stove the back in time controlled rolling of the austenite recrystallization district of steel (that is: 900-1150 ℃) enforcement twice, the deflection of each passage is between 20-40%, but the C of the rolling micro alloying element of strain inducing when this two passage is rolling, the Nization thing is separated out, it can stop recrystal grain to be grown up, but thereby refine austenite tissue, be the rolling preparation ideal of strain inducing original austenite structural state, it is rolling in 800-840 ℃ of temperature range steel billet to be implemented continuous three passage strain inducings then, every time deflection is 30-50%, the pitch time of each passage was less than 10 seconds, but strain inducing goes out ultra-fine ferritic structure in this deformation process, behind three passage continuous modifications, can make the ferritic volume fraction of strain inducing 〉=90%, can avoid ferrite crystal grain to grow up pitch time by shortening passage, after last passage of strain inducing is finished, speed of cooling with 〉=10 ℃/S is implemented to quicken cooling to steel, avoids the strain inducing ferrite crystal grain to grow up.
Grain refining is to improve one of most effectual way of the obdurability of material, the technology of the present invention is controlled by billet heating temperature, the controlled rolling of high temperature recrystallize, rolling control of strain inducing and acceleration cooling, can make the grain-size of micro-alloyed steel of the present invention be refined to 0.9-1.2 μ m, improve the obdurability of material effectively.
Compared with prior art, the invention has the advantages that:
1, degree of grain refinement is obvious.
Japanese YADA carries out controlled rolling to the C-Mn steel of 0.1C-1.0Mn, at the A of this steel
R3Above 30-50 ℃ when carrying out big dependent variable deformation, strain inducing ultra-fine ferrite tissue can obtain the super fine organization that ferrite grain size is 2-3 μ m, but this technology does not consider that the microstructure evolution situation is to the influence of final tissue formation before the finish rolling.And the inventive method can be refined to the grain-size of 0.1C-1.0Mn-0.04Nb-0.02Ti microalloyed steel 0.9-1.2 μ m.
2, can reduce the material cost of similar super fine organization micro-alloyed steel.
Middle nineteen nineties, people such as the SUNGHAK LEE of Korea S make the A of steel by add 1.0Ni and 2.0Nb in the 0.1c-1.0Mn steel
E3Temperature reduces, and then it is rolling that material is implemented the low temperature strain inducing, thereby obtaining ferrite grain size is the super fine organization of 1.1 μ m, but owing to added 1.0Ni and 0.2Nb in the steel, the cost of material has been increased widely, and the method for the invention is not add Ni and only adding under the situation of small amount of N b, consider on the full-range basis of control roll process, make the ferrite grain size of micro-alloyed steel 0.08-0.12C---0.8-1.4Mn---0.03-0.06Nb---0.01-0.03Ti be refined to 0.9-1.2 μ m, greatly reduce the cost of material, improve the ratio of performance to price.
Fig. 1 is the metallographic structure figure with the 1st batch of micro-alloyed steel steel plate of production method production of the present invention.
Fig. 2 is the metallographic structure figure with the 2nd batch of micro-alloyed steel steel plate of production method production of the present invention.
Fig. 3 is the metallographic structure figure with the 3rd batch of micro-alloyed steel steel plate of production method production of the present invention.
Embodiment.
Adopt production method of the present invention to make 3 batches of micro-alloyed steel steel plates, wherein, the chemical ingredients of 3 batches of steel plates (weight %) is listed in table 1, and the rolling technology system of 3 batches of steel plates is listed in table 2, the structural state of 3 batches of steel plates is listed in table 3, and the metallographic structure figure of 3 batches of steel plates sees Figure of description 1,2,3 respectively.
Table 1 embodiment micro-alloyed steel chemical ingredients (weight %)
The controlled rolling process system of table 2 embodiment steel
Table 3 is implemented the micro-alloyed steel structural state
Claims (1)
1, a kind of controlled rolling technology for microally steel with superfine structure is characterized in that: the main technique flow process is as follows: heat a recrystallize controlled rolling--strain inducing is rolling---acceleration cooling; At first, steel billet is heated to 1150 ℃-1220 ℃ fully dissolves microalloy element, steel billet is come out of the stove the back in 900-1150 ℃ of temperature range, implement twice time controlled rolling, the deflection of each passage is between 20-40%, it is rolling in 800-840 ℃ of temperature range steel billet to be implemented continuous three passage strain inducings then, every time deflection is 30-50%, the pitch time of each passage was less than 10 seconds, finish above-mentioned strain inducing rolling after, with the speed of cooling of 〉=10 ℃/S steel plate is implemented to quicken cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99109124A CN1078254C (en) | 1999-06-16 | 1999-06-16 | Controlled rolling technology for microally steel with superfine structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99109124A CN1078254C (en) | 1999-06-16 | 1999-06-16 | Controlled rolling technology for microally steel with superfine structure |
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| CN1243884A true CN1243884A (en) | 2000-02-09 |
| CN1078254C CN1078254C (en) | 2002-01-23 |
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| CN99109124A Expired - Fee Related CN1078254C (en) | 1999-06-16 | 1999-06-16 | Controlled rolling technology for microally steel with superfine structure |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100430182C (en) * | 2005-11-18 | 2008-11-05 | 东北大学 | Method for manufacturing nano-crystal particle low carbon micro alloy steel |
| CN1989266B (en) * | 2004-07-27 | 2013-09-18 | 新日铁住金株式会社 | High tensile strength steel sheet having reduced acoustic anisotropy, excellent weldability and its production method |
| CN105274302A (en) * | 2015-11-13 | 2016-01-27 | 江苏大学 | Micro-alloy ultra-fine grain hot rolled steel plate with high crystalline grain uniformity and preparation method thereof |
| CN106435364A (en) * | 2016-11-01 | 2017-02-22 | 北京科技大学 | Low-carbon micro-alloy superfine grained steel and manufacturing method thereof |
| CN106591553A (en) * | 2016-11-25 | 2017-04-26 | 钢铁研究总院 | Manufacturing method of ultrafine grain pipeline steel with bimodal grain distribution |
| CN108374131A (en) * | 2018-03-13 | 2018-08-07 | 昆明理工大学 | A kind of cooling controlling and rolling controlling process method of Ti-Mo combined microalloyings steel fine austenite grain |
| CN108486497A (en) * | 2018-03-13 | 2018-09-04 | 昆明理工大学 | A kind of cooling controlling and rolling controlling process method of Ti-Zr combined microalloyings steel fine austenite grain |
| CN108486496A (en) * | 2018-03-13 | 2018-09-04 | 昆明理工大学 | A kind of cooling controlling and rolling controlling process method of Ti-Zr-Mo combined microalloyings steel fine austenite grain |
| CN108546811A (en) * | 2018-04-12 | 2018-09-18 | 北京科技大学 | A kind of controlled rolling method of fine-grained martensitic aged stainless steel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4466842A (en) * | 1982-04-03 | 1984-08-21 | Nippon Steel Corporation | Ferritic steel having ultra-fine grains and a method for producing the same |
-
1999
- 1999-06-16 CN CN99109124A patent/CN1078254C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1989266B (en) * | 2004-07-27 | 2013-09-18 | 新日铁住金株式会社 | High tensile strength steel sheet having reduced acoustic anisotropy, excellent weldability and its production method |
| CN100430182C (en) * | 2005-11-18 | 2008-11-05 | 东北大学 | Method for manufacturing nano-crystal particle low carbon micro alloy steel |
| CN105274302A (en) * | 2015-11-13 | 2016-01-27 | 江苏大学 | Micro-alloy ultra-fine grain hot rolled steel plate with high crystalline grain uniformity and preparation method thereof |
| CN106435364A (en) * | 2016-11-01 | 2017-02-22 | 北京科技大学 | Low-carbon micro-alloy superfine grained steel and manufacturing method thereof |
| CN106591553A (en) * | 2016-11-25 | 2017-04-26 | 钢铁研究总院 | Manufacturing method of ultrafine grain pipeline steel with bimodal grain distribution |
| CN108374131A (en) * | 2018-03-13 | 2018-08-07 | 昆明理工大学 | A kind of cooling controlling and rolling controlling process method of Ti-Mo combined microalloyings steel fine austenite grain |
| CN108486497A (en) * | 2018-03-13 | 2018-09-04 | 昆明理工大学 | A kind of cooling controlling and rolling controlling process method of Ti-Zr combined microalloyings steel fine austenite grain |
| CN108486496A (en) * | 2018-03-13 | 2018-09-04 | 昆明理工大学 | A kind of cooling controlling and rolling controlling process method of Ti-Zr-Mo combined microalloyings steel fine austenite grain |
| CN108374131B (en) * | 2018-03-13 | 2020-11-06 | 昆明理工大学 | Controlled rolling and controlled cooling process method for superfine austenite grains of Ti-Mo composite microalloyed steel |
| CN108546811A (en) * | 2018-04-12 | 2018-09-18 | 北京科技大学 | A kind of controlled rolling method of fine-grained martensitic aged stainless steel |
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| Publication number | Publication date |
|---|---|
| CN1078254C (en) | 2002-01-23 |
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