CN101665865A - Structural transformation control method in continuous cooling process of ultra-low-carbon wire rod of square billet - Google Patents
Structural transformation control method in continuous cooling process of ultra-low-carbon wire rod of square billet Download PDFInfo
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- CN101665865A CN101665865A CN200910093644A CN200910093644A CN101665865A CN 101665865 A CN101665865 A CN 101665865A CN 200910093644 A CN200910093644 A CN 200910093644A CN 200910093644 A CN200910093644 A CN 200910093644A CN 101665865 A CN101665865 A CN 101665865A
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Abstract
The invention relates to a structural transformation control method in a continuous cooling process of an ultra-low-carbon wire rod of a square billet, belonging to the technical field of steel rolling. Aiming at the structural transformation in the continuous cooling process after thermal simulation transformation is carried out on a hot-rolling steel wire rod for a copper-clad steel wire, a continuous cooling structural transformation curve of the hot-rolling steel wire rod for the copper-clad steel wire is analyzed through structural transformation characteristics in the continuous coolingprocess under different cooling rates after the hot transformation. The invention solves the problems of cooling process and structural control after the hot-rolling steel wire rod for the copper-cladsteel wire rod is rolled, and provides data support on crystallite dimension control and tertiary cementite precipitation number for rolling and producing the ultra-low-carbon wire rod of the squarebillet.
Description
Technical field
The invention belongs to technical field of steel rolling, a kind of structural transformation control method in continuous cooling process of ultra-low-carbon wire rod of square billet particularly is provided, be mainly used in roll the afterwards organizational controls of welding wire with gren rod.
Background technology
The main application of ultra-low-carbon wire rod of square billet gren rod is the welding wire goods that become to be used for the communications field by deep processing after drawing, the copper facing.Its gren rod should have good drawing and extension property.So its gren rod tissue should be based on thin ferrite, and the tertiary cementite quantity during control is organized as far as possible.In addition, ultra-low-carbon wire rod of square billet gren rod tensile strength and relative reduction in area have the upper and lower bound requirement, so ferrite crystal grain can not be too thin.
Roll postcooling speed and determining austenitic decomposition temperature and time, also determining the final tissue and the performance of gren rod simultaneously.So the rate of cooling control after production is rolled for wire rod is the key problem of whole rolling cooling control technology.It is too slow to roll postcooling speed, serious tertiary cementite can occur and separate out, and increases the wire broken rate in user's drawing process; Cooling rate is too fast, will improve the tensile strength of tissue, reduces the plasticity of material, influences drawing property.
Summary of the invention
The object of the present invention is to provide a kind of structural transformation control method in continuous cooling process of ultra-low-carbon wire rod of square billet, solved welding wire and rolled postcooling technology and organizational controls problem, separated out quantity for the Rolling Production ultra-low-carbon wire rod of square billet at grain-size control and tertiary cementite the data support is provided with gren rod.
The present invention is directed to the structural transformation in the continuous cooling process of a kind of welding wire usefulness gren rod thermal analogy distortion back, by the structural transformation characteristic in the continuous cooling process under the cold rate of different coolings after the thermal distortion, analyzed welding wire with the continuous cools tissue transition curve of gren rod.Provide the continuous cooling curve of welding wire, control its structural transformation by rolling the different process for cooling in back with gren rod.
The present invention adopts the swollen method that rises of thermal analogy to analyze the structural transformation process under the different cooling speed after the thermal distortion, and concrete steps are as follows:
1, the hot rolling material line with ultra low-carbon steel SWRM6 cuts into Φ 8 * 16 cylinder samples, the utilization plavini, on Gleeble2000, ultra low-carbon steel SWRM6 thermal analogy cylinder sample is heated to 950-1050 ℃, insulation 100-200s, behind the distortion 40-60%, cool off with the ultra low-carbon steel SWRM6 thermal analogy sample of 0.2 ℃/s～15 ℃/s rate of cooling after, and record the phase change data of ultra low-carbon steel SWRM6 distortion.
2, observe on the metaloscope rate of cooling in 0.2 ℃/s～15 ℃/structural state of ultra low-carbon steel SWRM6 during s, on metaloscope, measure the microhardness (HV of its different tissues simultaneously
0.2).
3, measure beginning temperature, time and end temp, the time of the flex point judgement ultra low-carbon steel SWRM6 structural transformation on the ultra low-carbon steel SWRM6 sample expansion curve according to the expansion tester.
4, the ultra low-carbon steel SWRM6 phase transformation that records according to dilatometer test and metaloscope and organize data to determine ultra low-carbon steel SWRM6 in the cooling rate scope of 0.2-15 ℃/s, along with rate of cooling increases, ferrite grain size constantly reduces; In the cooling rate scope of 0.2-5 ℃/s, along with rate of cooling increases, tertiary cementite quantity reduces; During greater than 8 ℃/s, there is not tertiary cementite to separate out in cooling rate speed in the tissue.
Description of drawings
Fig. 1 is SWRM6 wire rod metallographic structure 500X under the 0.5 ℃/s process for cooling condition.
Fig. 2 is SWRM6 wire rod metallographic structure 500X under the 5 ℃/s process for cooling condition.
Fig. 3 is a ultra low-carbon steel SWRM6 CCT curve.
Embodiment
The present invention obtains adopting at the Shoudu Iron and Steel Co first wire rolling plants Rolling Production high-quality ultra low-carbon steel SWRM6 wire rod.Adopt process for cooling of the present invention, produce the SWRM6 wire rod of the ￠ 6.5mm specification that meets the demands in batches at Shoudu Iron and Steel Co, roll the back and open stay-warm case, roll the back cooling rate and be controlled at 5 ℃/s, ferrite grain size does not have tertiary cementite to separate out at 10～15 μ m substantially in the wire rod tissue, the tensile strength of wire rod is at 320～350MPa, reduction of area reaches user and GB requirement greater than 75%, is used for the processing welding wire.
Embodiment 2
The present invention obtains adopting at the Shoudu Iron and Steel Co first wire rolling plants Rolling Production high-quality ultra low-carbon steel SWRM6 wire rod.Adopt process for cooling of the present invention, produce the SWRM6 wire rod of the ￠ 6.5mm specification that meets the demands in batches at Shoudu Iron and Steel Co, close all stay-warm cases after rolling, roll the back cooling rate and be controlled at 0.5 ℃/s, ferrite grain size is at 20-30 μ m, a large amount of tertiary cementites are separated out in the crystal boundary position in the wire rod tissue, and the tensile strength of wire rod is at 300～320MPa, and reduction of area is greater than 85%.
Claims (1)
1, a kind of structural transformation control method in continuous cooling process of ultra-low-carbon wire rod of square billet, the structural transformation process after the swollen method analysis thermal distortion of rising of employing thermal analogy under the different cooling speed is characterized in that concrete steps are as follows:
(1) the hot rolling material line with ultra low-carbon steel SWRM6 cuts into Ф 8 * 16 cylinder samples, the utilization plavini, on Gleeble2000, ultra low-carbon steel SWRM6 thermal analogy cylinder sample is heated to 950～1050 ℃, insulation 100-200s, behind the distortion 40-60%, with 0.2 ℃/s～, the ultra low-carbon steel SWRM6 thermal analogy sample of 15 ℃/s rate of cooling after to distortion cool off, and records the phase change data of ultra low-carbon steel SWRM6;
(2) observe on the metaloscope rate of cooling 0.2 ℃/s～, the structural state of ultra low-carbon steel SWRM6 during 15 ℃/s, on metaloscope, measure the microhardness of its different tissues simultaneously;
(3) measure beginning temperature, time and end temp, the time that flex point on the ultra low-carbon steel SWRM6 sample expansion curve is judged ultra low-carbon steel SWRM6 structural transformation according to the expansion tester;
(4) the ultra low-carbon steel SWRM6 phase transformation that records according to dilatometer test and metaloscope and organize data to determine ultra low-carbon steel SWRM6 in the cooling rate scope of 0.2-15 ℃/s, along with the rate of cooling increase, ferrite grain size constantly reduces; In the cooling rate scope of 0.2-5 ℃/s, along with rate of cooling increases, tertiary cementite quantity reduces; During greater than 8 ℃/s, there is not tertiary cementite to separate out in cooling rate speed in the tissue.
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Cited By (5)
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| CN102189122A (en) * | 2011-04-12 | 2011-09-21 | 首钢总公司 | Method for controlling process for cooling hot-rolled ultra low carbon steel wire rod after rolling |
| CN102443692A (en) * | 2011-11-29 | 2012-05-09 | 首钢总公司 | Structural transformation control method for continuous cooling process of low-carbon boron-containing steel wire of square billet |
| CN102632089A (en) * | 2011-11-29 | 2012-08-15 | 首钢总公司 | Control method of cooling process of hot-rolled low-carbon boron-containing steel wire rod after rolling |
| CN103736744A (en) * | 2013-12-28 | 2014-04-23 | 首钢总公司 | Hot rolling method for controlling tertiary cementite of low-carbon steel wire rod |
| CN104772346A (en) * | 2015-04-07 | 2015-07-15 | 首钢总公司 | Method for reducing tensile strength of steel hot-rolled wire rod for flexible copper-clad steel wire |
Family Cites Families (4)
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| JP3215891B2 (en) * | 1991-06-14 | 2001-10-09 | 新日本製鐵株式会社 | Manufacturing method of steel rod for cold working |
| CN100435990C (en) * | 2004-11-17 | 2008-11-26 | 首钢总公司 | After-roll reinforced cooling process for 82B wire rod steel strand |
| CN1702183A (en) * | 2005-02-16 | 2005-11-30 | 安阳钢铁集团有限责任公司 | Ultra-fine grain hot-rolled steel coil with ribs and method for manufacturing the same |
| CN101462155B (en) * | 2007-12-21 | 2010-12-01 | 首钢总公司 | Method for producing ultra-low carbon wire by small square billet continuous casting |
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2009
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102189122A (en) * | 2011-04-12 | 2011-09-21 | 首钢总公司 | Method for controlling process for cooling hot-rolled ultra low carbon steel wire rod after rolling |
| CN102189122B (en) * | 2011-04-12 | 2012-10-10 | 首钢总公司 | Method for controlling process for cooling hot-rolled ultra low carbon steel wire rod after rolling |
| CN102443692A (en) * | 2011-11-29 | 2012-05-09 | 首钢总公司 | Structural transformation control method for continuous cooling process of low-carbon boron-containing steel wire of square billet |
| CN102632089A (en) * | 2011-11-29 | 2012-08-15 | 首钢总公司 | Control method of cooling process of hot-rolled low-carbon boron-containing steel wire rod after rolling |
| CN103736744A (en) * | 2013-12-28 | 2014-04-23 | 首钢总公司 | Hot rolling method for controlling tertiary cementite of low-carbon steel wire rod |
| CN103736744B (en) * | 2013-12-28 | 2016-01-20 | 首钢总公司 | A kind of hot-rolling method controlling low-carbon steel rod bundle tertiary cementite |
| CN104772346A (en) * | 2015-04-07 | 2015-07-15 | 首钢总公司 | Method for reducing tensile strength of steel hot-rolled wire rod for flexible copper-clad steel wire |
| CN104772346B (en) * | 2015-04-07 | 2017-01-04 | 首钢总公司 | A kind of method reducing soft state welding wire steel gren rod tensile strength |
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| CN101665865B (en) | 2011-01-05 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |