CN101613790A - A kind of production method of coils with high yield strength - Google Patents
A kind of production method of coils with high yield strength Download PDFInfo
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- CN101613790A CN101613790A CN200810012106A CN200810012106A CN101613790A CN 101613790 A CN101613790 A CN 101613790A CN 200810012106 A CN200810012106 A CN 200810012106A CN 200810012106 A CN200810012106 A CN 200810012106A CN 101613790 A CN101613790 A CN 101613790A
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Abstract
The invention provides a kind of production method of coils with high yield strength, comprise: medium thin slab continuous casting → steel slab surface temperature greater than 700 ℃ of hot chargings go into process furnace → roughing → treat temperature → finish rolling → laminar flow cool off → batch → roll postheat treatment → air cooling, it is described that to roll postheat treatment be to be incubated 1～50 minute after the roll bending after batching is heated to 580～650 ℃ of thermal treatment temps.The present invention adopts and rolls the postheat treatment reinforcement, has reduced the requirement to mill capacity; Shorten the soaking time of rolling postheat treatment, satisfied quantity-produced requirement in enormous quantities, both saved a large amount of time and the energy, improved production efficiency again; Effectively improved the yield strength of the roll bending of medium thin slab continuous casting and rolling production line production.
Description
Technical field
The invention belongs to the hot mechanical treatment of micro-alloyed steel (TMCP) technical field, relate in particular to the production method of a kind of high-tensile and high-yield strength acicular ferrite rolled steel plate.
Background technology
Along with the high speed development of China's national economy, the oil and natural gas pipeline is increased with the demand of engineerings such as hot-rolled coil with high-strength hot-rolled roll bending with roll bending and engineering machinery with roll bending, Hot Rolling Automobile day by day with roll bending, freight container.Therefore develop high strength roll bending (yield strength 〉=550Mpa) be imminent.The production technique of high-yield strength hot-rolled coil mainly adopts conventional hot continuous rolling machine technology at present.Utilize continuous casting and rolling technique of sheet bar production high strength roll bending, owing to be subjected to the influence of factors such as strand structure, mill capacity and reeling machine power, high-yield strength generally is no more than 550MPa.
It is that the Chinese patent of CN 1487101A has been reported the method that improves acicular ferrite pipeline steel roll bending intensity with heat treating method that disclosed name in 2004 is called " a kind of method that improves strength of acicular ferrite pipeline steel " publication number.Its specific implementation method be on existing milling train behind hot mechanical treatment, in 550～650 ℃ of temperature ranges, be incubated 1～10 hour, finally make yield strength bring up to 690MPa by 550MPa.Problem is that the required heat treatment time of the high strength roll bending of this technical scheme production yield strength 〉=550MPa of employing is oversize, not only production efficiency is low, be not suitable for industrial continuous production in enormous quantities, and, if online application, the temperature of roll bending can be lower than desired 550～650 ℃ in 1～10 hour soaking time, must increase auxiliary lagging facility and thermal source, causes production cost to increase.
Summary of the invention
The objective of the invention is to overcome the long problem of existing in prior technology heat treatment time, provide a kind of and add the method for the thermal treatment process production yield strength of short period of time subsequently up to the roll bending of 700MPa with medium thin slab hot-loading and hot-conveying casting and rolling process.
The present invention is achieved in that the production method of this coils with high yield strength comprises following operation: medium thin slab continuous casting → medium thin slab hot-loading and hot-conveying → roughing → treat temperature → finish rolling → laminar flow cools off → batches → roll postheat treatment → air cooling, described to roll postheat treatment be to be incubated 1～50 minute after the roll bending after batching is heated to 580～650 ℃ of thermal treatment temps, and air cooling is to room temperature then.
The thickness of the described medium thin slab of production method of coils with high yield strength of the present invention is 130～170mm; Described medium thin slab hot-loading and hot-conveying is meant when the medium thin slab surface temperature that goes out when continuous casting is greater than 700 ℃ sends into process furnace with regard to hot charging.The composition weight percent of described roll bending is: C:0.03～0.09, Si:0.10～0.20, Mn:1.4～1.8, P＜0.020, S:＜0.010, Nb:0.04～0.08, V:0.02～0.04, Ti:0.01～0.02, Mo:0.20～0.30, Ni:0.10～0.20, Cu:0.15～0.30, Als:0.02～0.08, N:0.002～0.008.
Why the production method of coils with high yield strength of the present invention selects the medium thin slab continuous casting and rolling production technique for use, be because in the medium thin slab continuous casting and rolling production process, the high temperature strand directly enters the process furnace heating, be hot-loading and hot-conveying technology, compare with the cold charge technology that reenters the reheating furnace heating behind the common continuous casting steel billet cool to room temperature again, after the reheating furnace heating of hot-mounting process before rolling, the micro alloying element content that is solid solution condition is more, degree of supersaturation in the acicular ferrite that forms when batching after rolling is bigger, when in the certain temperature range more higher, being incubated than coiling temperature, the chemical driving force that its micro alloying element is separated out is also bigger, and separating out the needed time also shortens dramatically, only need the thermal treatment of 1～50min that micro alloying element is fully separated out, reach the purpose that improves the roll bending yield strength.
The beneficial effect of producing coils with high yield strength with the inventive method is: adopt and roll the postheat treatment reinforcement, reduced the requirement to mill capacity; Shorten the soaking time of rolling postheat treatment, satisfied quantity-produced requirement in enormous quantities, both saved a large amount of time and the energy, improved production efficiency again; Effectively improved the high-yield strength of the roll bending that the medium thin slab continuous casting and rolling production line produces, brought up to 700MPa by 550MPa.
Embodiment
The present invention is further described by the following embodiment.
The embodiment of the invention is an example with the production flow line rolled steel plate.Adopt the medium thin slab continuous casting and rolling production technique that the steel of following composition is produced: (weight percent) C:0.03～0.09, Si:0.10～0.20, Mn:1.4～1.8, P＜0.020, S:＜0.010, Nb:0.04～0.08, V:0.02～0.04, Ti:0.01～0.02, Mo:0.20～0.30, Ni:0.10～0.20, Cu:0.15～0.30, Als:0.02～0.08, N:0.002～0.008.
Embodiment 1
Hot charging is sent into process furnace when 760 ℃ of thick medium thin slab surface temperatures of 170mm, is heated to 1180 ℃ and carries out roughing, is rolled to 62mm, treats that temperature to 940 ℃ of temperature, carries out finish rolling again, is rolled to 17mm, carries out the laminar flow cooling after the finish to gauge, batches at 500 ℃.Then, the roll bending after batching is reheated 615 ℃ in heat treatment furnace, be incubated 5 minutes, air cooling to the room temperature of coming out of the stove subsequently gets final product.The concrete composition of this steel sees Table 1, and the mechanical property of sheet material sees Table 2 before and after handling.
Embodiment 2
Hot charging is sent into process furnace when 790 ℃ of thick medium thin slab surface temperatures of 170mm, is heated to 1200 ℃ and carries out roughing, is rolled to 55mm, treats that temperature to 950 ℃ of temperature, carries out finish rolling again, is rolled to 16.5mm, carries out the laminar flow cooling after the finish to gauge, batches at 550 ℃.Then, the roll bending after batching is reheated 585 ℃ in heat treatment furnace, be incubated 30 minutes, air cooling to the room temperature of coming out of the stove subsequently gets final product.The concrete composition of this steel sees Table 1, and the mechanical property of sheet material sees Table 2 before and after handling.
Embodiment 3
Hot charging is sent into process furnace when 820 ℃ of thick medium thin slab surface temperatures of 170mm, is heated to 1170 ℃ and carries out roughing, is rolled to 57mm, treats that temperature to 930 ℃ of temperature, carries out finish rolling again, is rolled to 17.5mm, carries out the laminar flow cooling after the finish to gauge, batches at 530 ℃.Then, the roll bending after batching is reheated 600 ℃ in heat treatment furnace, be incubated 50 minutes, air cooling to the room temperature of coming out of the stove subsequently gets final product.The concrete composition of this steel sees Table 1, and the mechanical property of sheet material sees Table 2 before and after handling.
The chemical ingredients (weight %) of table 1 various embodiments of the present invention pipe line steel roll bending
| Embodiment | ??C | ??Si | ??Mn | ??P | ??S | ??Nb | ??V | ??Ti | ??Mo | ??Ni | ??Cu | ??Als | ??N |
| ??1 | ??0.064 | ??0.142 | ??1.642 | ??0.011 | ??0.001 | ??0.07 | ??0.035 | ??0.012 | ??0.30 | ??0.189 | ??0.205 | ??0.021 | ??0.0031 |
| ??2 | ??0.057 | ??0.159 | ??1.674 | ??0.015 | ??0.001 | ??0.061 | ??0.034 | ??0.012 | ??0.21 | ??0.156 | ??0.153 | ??0.021 | ??0.0035 |
| ??3 | ??0.038 | ??0.149 | ??1.678 | ??0.012 | ??0.001 | ??0.066 | ??0.03 | ??0.014 | ??0.249 | ??0.163 | ??0.179 | ??0.024 | ??0.0029 |
Mechanical property before and after the thermal treatment of table 2 various embodiments of the present invention pipe line steel roll bending relatively
Claims (4)
1. the production method of a coils with high yield strength, it is characterized in that this production method comprises following operation: medium thin slab continuous casting → medium thin slab hot-loading and hot-conveying → roughing → treat temperature → finish rolling → laminar flow cools off → batches → roll postheat treatment → air cooling, and described to roll postheat treatment be to be incubated 1～50 minute after the roll bending after batching is heated to 580～650 ℃ of thermal treatment temps.
2. the production method of coils with high yield strength according to claim 1, the thickness that it is characterized in that described medium thin slab is 130～170mm.
3. the production method of coils with high yield strength according to claim 1 is characterized in that described medium thin slab hot-loading and hot-conveying refers to that hot charging is sent into process furnace when the medium thin slab surface temperature is not less than 700 ℃.
4. the production method of coils with high yield strength according to claim 1 is characterized in that the composition weight percent of described roll bending is: C:0.03～0.09, Si:0.10～0.20, Mn:1.4～1.8, P＜0.020, S:＜0.010, Nb:0.04～0.08, V:0.02～0.04, Ti:0.01～0.02, Mo:0.20～0.30, Ni:0.10～0.20, Cu:0.15～0.30, Als:0.02～0.08, N:0.002～0.008.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810012106A CN101613790A (en) | 2008-06-27 | 2008-06-27 | A kind of production method of coils with high yield strength |
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| CN200810012106A CN101613790A (en) | 2008-06-27 | 2008-06-27 | A kind of production method of coils with high yield strength |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943165A (en) * | 2012-11-14 | 2013-02-27 | 无锡市光源不锈钢制品有限公司 | Method for obtaining flat stainless steel belt |
| CN111057954A (en) * | 2020-01-02 | 2020-04-24 | 鞍钢股份有限公司 | High-strength pipeline rolled plate for large thick wall acidity and manufacturing method thereof |
| CN111235479A (en) * | 2020-02-17 | 2020-06-05 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of economical pipeline steel |
-
2008
- 2008-06-27 CN CN200810012106A patent/CN101613790A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943165A (en) * | 2012-11-14 | 2013-02-27 | 无锡市光源不锈钢制品有限公司 | Method for obtaining flat stainless steel belt |
| CN111057954A (en) * | 2020-01-02 | 2020-04-24 | 鞍钢股份有限公司 | High-strength pipeline rolled plate for large thick wall acidity and manufacturing method thereof |
| CN111235479A (en) * | 2020-02-17 | 2020-06-05 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of economical pipeline steel |
| CN111235479B (en) * | 2020-02-17 | 2021-09-24 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of economical pipeline steel |
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Application publication date: 20091230 |