CN103773935A - Process for rolling low yield ratio and high plasticity steel plate with thickness of 40 nm - Google Patents
Process for rolling low yield ratio and high plasticity steel plate with thickness of 40 nm Download PDFInfo
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- CN103773935A CN103773935A CN201210412175.4A CN201210412175A CN103773935A CN 103773935 A CN103773935 A CN 103773935A CN 201210412175 A CN201210412175 A CN 201210412175A CN 103773935 A CN103773935 A CN 103773935A
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Abstract
The invention discloses a process for rolling a low yield ratio and high plasticity steel plate with the thickness of 40 nm. According to the method, a controlled rolling and controlled cooling process is adopted; a continuous casting blank which is 150-200 mm is heated to be 1,180-1,200 DEG C before rolling; an austenite recrystalline region and an austenite non-recrystalline region are adopted for controlling rolling in a two-stage manner; the reduction rate of each gate in rough rolling is 12-15%; the final rolling temperature in rough rolling is 1,000-1,050 DEG C; a middle blank with the 1.5-2.0 times of the thickness of a finished product is roughly rolled; the initial rolling temperature in finish rolling is 850-870 DEG C; the reduction rate of each gate is 10-15%; the final rolling temperature in finish rolling is 800-830 DEG C; laminar cooling is adopted after rolling; the final cooling temperature is 580-630 DEG C; the cooling velocity is 7-10 DEG C/s; subsequently air cooling is performed; TMCP (Thermal Mechanical Control Processing) rolling is performed in a hot rolling workshop so as to obtain the steel plate which is 20 mm thick, low in yield ratio and high in plasticity and comprises a bainite structure. Due to adoption of a thermal treatment process, a low yield ratio and high plasticity steel plate is prepared.
Description
Technical field
The present invention relates to a kind of high-strength steel, specifically a kind of low yield strength ratio high-ductility steel.
Background technology
Along with society and expanding economy, Iron And Steel Industry is faced with three large pressure of saving resource, save energy, protection of the environment.Therefore, improve steel product quality, reduce costs, increase substantially its comprehensive mechanical property, become the main direction of ferrous materials research.
Conventionally, the yield strength of steel and tensile strength are directly proportional to-1/2 power of crystal grain diameter d, and grain refining significantly improves the yield strength and the tensile strength that make steel.The rising of yield tensile ratio significantly declines the cold forming capability that causes steel.Thereby, high-yield-ratio, inductile be existing Ultra-fine Grained production technology still need solve a difficult problem.
Summary of the invention
The object of this invention is to provide a kind of rolling technology of low yield strength ratio high-ductility steel plate.By the micro-alloy low-carbon steel plate of this art breading, yield tensile ratio is low, plasticity is high, intensity is high.
The object of the invention is to be achieved through the following technical solutions:
A rolling technology for low yield strength ratio high-ductility steel plate, is characterized in that: adopt cooling controlling and rolling controlling process, roll and front continuously cast bloom thick 150-200 mm is heated to 1180 ℃～1200 ℃; Adopt austenite recrystallization district and the two-stage control rolling of austenite non-recrystallization district, every time draft 12～15% of roughing, 1000～1050 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 1.5 ~ 2.0 times of finished product thicknesses; Finish rolling start rolling temperature is 850～870 ℃, and every time draft is 10～15%, 800～830 ℃ of finish rolling finishing temperatures; Roll rear employing laminar flow cooling, 580～630 ℃ of final cooling temperatures, 7～10 ℃/s of rate of cooling, air cooling subsequently; Carry out TMCP rolling in hot rolling workshop, obtain that 40mm is thick, the low yield strength ratio high-ductility steel plate of bainite structure; In this steel plate, chemical composition is by weight percentage: C:0.07～0.09%, Si:0.15～0.20%, Mn:1.30～1.50%, P :≤0.008%, S :≤0.004%, Ti:0.010～0.015%, Cr:0.10～0.20%, Ni:0.15～0.20%, Cu:0.20～0.25%, Al:0.025～0.030%, surplus is Fe and inevitable impurity.
In the present invention, the alloying elements such as Ti, Cr, Ni mainly play strengthening effect.
The present invention improves yield strength and the tensile strength of steel plate by microalloying and controlled rolling and controlled cooling, by two-phase region quench or tempering increase precipitate separate out probability, obtain uniform ultra-fine grained ferrite structure, make material there is the characteristics such as low yield strength ratio, superplasticity, high strength.Stable processing technique, workable, cost is low, the material excellent combination property of acquisition.
Embodiment
Embodiment 1
A kind of rolling technology of low yield strength ratio high-ductility steel plate, adopt cooling controlling and rolling controlling process, roll and frontly continuously cast bloom thick 180 mm is heated to 1180 ℃ adopts austenite recrystallization districts and the two-stage control rolling of austenite non-recrystallization district, every time draft 12～15% of roughing, 1000 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 1.5 ~ 2.0 times of finished product thicknesses; Finish rolling start rolling temperature is 850 ℃, and every time draft is 10～15%, 800 ℃ of finish rolling finishing temperatures; Roll rear employing laminar flow cooling, 580 ℃ of final cooling temperatures, 7～10 ℃/s of rate of cooling, air cooling subsequently; Carry out TMCP rolling in hot rolling workshop, obtain that 40mm is thick, the low yield strength ratio high-ductility steel plate of bainite structure; In this steel plate, chemical composition is by weight percentage: C:0.07%, Si:0.18%, Mn:1.30%, P:0.008%, S:0.004%, Ti:0.011%, Cr:0.10%, Ni:0.15%, Cu:0.20%, Al:0.025%, surplus is Fe and inevitable impurity.
Embodiment 2
A rolling technology for low yield strength ratio high-ductility steel plate, adopts cooling controlling and rolling controlling process, rolls and front continuously cast bloom thick 200 mm is heated to 1200 ℃; Adopt austenite recrystallization district and the two-stage control rolling of austenite non-recrystallization district, every time draft 12～15% of roughing, 1050 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 1.5 ~ 2.0 times of finished product thicknesses; 870 ℃ of finish rolling start rolling temperatures, every time draft is 10～15%, 830 ℃ of finish rolling finishing temperatures; Roll rear employing laminar flow cooling, 630 ℃ of final cooling temperatures, 7～10 ℃/s of rate of cooling, air cooling subsequently; Carry out TMCP rolling in hot rolling workshop, obtain that 40mm is thick, the low yield strength ratio high-ductility steel plate of bainite structure; In this steel plate, chemical composition is by weight percentage: C:0.09%, Si:0.20%, Mn:1.50%, P:0.008%, S:0.005%, Ti:0.015%, Cr:0.20%, Ni:0.18%, Cu:0.25%, Al:0.030%, surplus is Fe and inevitable impurity.
In the present invention, the mechanical property of embodiment 1 and 2 is in table 1:
Table 1
The present invention improves yield strength and the tensile strength of steel plate by microalloying and controlled rolling and controlled cooling, by two-phase region quench increase precipitate separate out probability, obtain uniform ultra-fine grained ferrite structure, make material there is the characteristics such as low yield strength ratio, superplasticity, high strength.Stable processing technique, workable, cost is low, the material excellent combination property of acquisition.
Claims (1)
1. a rolling technology for low yield strength ratio high-ductility steel plate, is characterized in that: adopt cooling controlling and rolling controlling process, roll and front continuously cast bloom thick 150-200 mm is heated to 1180 ℃～1200 ℃; Adopt austenite recrystallization district and the two-stage control rolling of austenite non-recrystallization district, every time draft 12～15% of roughing, 1000～1050 ℃ of roughing finishing temperatures, roughing becomes the intermediate blank of 1.5 ~ 2.0 times of finished product thicknesses; Finish rolling start rolling temperature is 850～870 ℃, and every time draft is 10～15%, 800～830 ℃ of finish rolling finishing temperatures; Roll rear employing laminar flow cooling, 580～630 ℃ of final cooling temperatures, 7～10 ℃/s of rate of cooling, air cooling subsequently; Carry out TMCP rolling in hot rolling workshop, obtain that 40mm is thick, the low yield strength ratio high-ductility steel plate of bainite structure; In this steel plate, chemical composition is by weight percentage: C:0.07～0.09%, Si:0.15～0.20%, Mn:1.30～1.50%, P :≤0.008%, S :≤0.004%, Ti:0.010～0.015%, Cr:0.10～0.20%, Ni:0.15～0.20%, Cu:0.20～0.25%, Al:0.025～0.030%, surplus is Fe and inevitable impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210412175.4A CN103773935A (en) | 2012-10-25 | 2012-10-25 | Process for rolling low yield ratio and high plasticity steel plate with thickness of 40 nm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210412175.4A CN103773935A (en) | 2012-10-25 | 2012-10-25 | Process for rolling low yield ratio and high plasticity steel plate with thickness of 40 nm |
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| CN103773935A true CN103773935A (en) | 2014-05-07 |
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| CN201210412175.4A Pending CN103773935A (en) | 2012-10-25 | 2012-10-25 | Process for rolling low yield ratio and high plasticity steel plate with thickness of 40 nm |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114134387A (en) * | 2021-11-15 | 2022-03-04 | 山东钢铁集团日照有限公司 | 1300 MPa-tensile-strength thick-specification ultrahigh-strength steel plate and manufacturing method thereof |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57143435A (en) * | 1981-03-02 | 1982-09-04 | Nippon Steel Corp | Manufacture of high strength steel sheet for working by continuous annealing |
| JPH10306316A (en) * | 1997-04-28 | 1998-11-17 | Nippon Steel Corp | Production of low yield ratio high tensile-strength steel excellent in low temperature toughness |
| JP2005048224A (en) * | 2003-07-31 | 2005-02-24 | Jfe Steel Kk | Method for producing low yield ratio, high strength and high toughness steel plate excellent in weld heat affected zone toughness |
| CN1614067A (en) * | 2004-09-23 | 2005-05-11 | 攀钢集团攀枝花钢铁研究院 | Superfine crystal particle hot-rolling steel plate with thick specification and production thereof |
| CN101768698A (en) * | 2010-01-27 | 2010-07-07 | 莱芜钢铁股份有限公司 | Low cost yield strength 700MPA level non-tempering processing high strength steel plate and manufacturing method thereof |
| CN101812635A (en) * | 2010-04-28 | 2010-08-25 | 南京钢铁股份有限公司 | Class Q345F steel sheet with thickness of 80mm and manufacturing method thereof |
| CN101831586A (en) * | 2010-04-30 | 2010-09-15 | 南京钢铁股份有限公司 | Low-carbon equivalent weight high-strength thick steel plate with excellent low-temperature toughness and manufacture method |
| CN101886221A (en) * | 2010-07-16 | 2010-11-17 | 攀钢集团钢铁钒钛股份有限公司 | Micro-alloy ultra-fine grained hot rolled steel plate and production method thereof |
| CN101985722A (en) * | 2010-09-20 | 2011-03-16 | 南京钢铁股份有限公司 | Pipeline steel plate with low yield ratio, fine grains and high strength and production method thereof |
| CN102080192A (en) * | 2011-01-07 | 2011-06-01 | 南京钢铁股份有限公司 | Low-yield ratio, high-plasticity, ultrafine-grain and high-strength steel and manufacturing method thereof |
| CN102277539A (en) * | 2011-08-01 | 2011-12-14 | 南京钢铁股份有限公司 | High-strength steel with low yield ratio, high plasticity and ultrafine grain and preparation method thereof |
| CN102286695A (en) * | 2011-08-30 | 2011-12-21 | 南京钢铁股份有限公司 | High-plasticity high-toughness and ultra-high-intensity steel plate and production method thereof |
-
2012
- 2012-10-25 CN CN201210412175.4A patent/CN103773935A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57143435A (en) * | 1981-03-02 | 1982-09-04 | Nippon Steel Corp | Manufacture of high strength steel sheet for working by continuous annealing |
| JPH10306316A (en) * | 1997-04-28 | 1998-11-17 | Nippon Steel Corp | Production of low yield ratio high tensile-strength steel excellent in low temperature toughness |
| JP2005048224A (en) * | 2003-07-31 | 2005-02-24 | Jfe Steel Kk | Method for producing low yield ratio, high strength and high toughness steel plate excellent in weld heat affected zone toughness |
| CN1614067A (en) * | 2004-09-23 | 2005-05-11 | 攀钢集团攀枝花钢铁研究院 | Superfine crystal particle hot-rolling steel plate with thick specification and production thereof |
| CN101768698A (en) * | 2010-01-27 | 2010-07-07 | 莱芜钢铁股份有限公司 | Low cost yield strength 700MPA level non-tempering processing high strength steel plate and manufacturing method thereof |
| CN101812635A (en) * | 2010-04-28 | 2010-08-25 | 南京钢铁股份有限公司 | Class Q345F steel sheet with thickness of 80mm and manufacturing method thereof |
| CN101831586A (en) * | 2010-04-30 | 2010-09-15 | 南京钢铁股份有限公司 | Low-carbon equivalent weight high-strength thick steel plate with excellent low-temperature toughness and manufacture method |
| CN101886221A (en) * | 2010-07-16 | 2010-11-17 | 攀钢集团钢铁钒钛股份有限公司 | Micro-alloy ultra-fine grained hot rolled steel plate and production method thereof |
| CN101985722A (en) * | 2010-09-20 | 2011-03-16 | 南京钢铁股份有限公司 | Pipeline steel plate with low yield ratio, fine grains and high strength and production method thereof |
| CN102080192A (en) * | 2011-01-07 | 2011-06-01 | 南京钢铁股份有限公司 | Low-yield ratio, high-plasticity, ultrafine-grain and high-strength steel and manufacturing method thereof |
| CN102277539A (en) * | 2011-08-01 | 2011-12-14 | 南京钢铁股份有限公司 | High-strength steel with low yield ratio, high plasticity and ultrafine grain and preparation method thereof |
| CN102286695A (en) * | 2011-08-30 | 2011-12-21 | 南京钢铁股份有限公司 | High-plasticity high-toughness and ultra-high-intensity steel plate and production method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114134387A (en) * | 2021-11-15 | 2022-03-04 | 山东钢铁集团日照有限公司 | 1300 MPa-tensile-strength thick-specification ultrahigh-strength steel plate and manufacturing method thereof |
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Application publication date: 20140507 |