CN102107220A - Method for controlling temperature of steel intermediate billet to be rolled for engineering machinery - Google Patents
Method for controlling temperature of steel intermediate billet to be rolled for engineering machinery Download PDFInfo
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- CN102107220A CN102107220A CN2009102487868A CN200910248786A CN102107220A CN 102107220 A CN102107220 A CN 102107220A CN 2009102487868 A CN2009102487868 A CN 2009102487868A CN 200910248786 A CN200910248786 A CN 200910248786A CN 102107220 A CN102107220 A CN 102107220A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 39
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003801 milling Methods 0.000 claims description 9
- 238000010583 slow cooling Methods 0.000 claims 2
- 239000013078 crystal Substances 0.000 abstract description 4
- 239000007921 spray Substances 0.000 abstract description 4
- 229910001566 austenite Inorganic materials 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000004904 shortening Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention provides a method for controlling the temperature of an intermediate billet for steel for engineering machinery to be rolled, which combines water cooling with air cooling for the two-stage rolled intermediate billet, controls the cooling speed and the time for waiting for temperature, carries out spray cooling on the intermediate billet with the thickness of more than or equal to 100mm after rolling to a preset temperature at the cooling rate of 2-5K/s, puts the intermediate billet into the air for waiting for 60-250 s, and sends the intermediate billet into a finishing mill for finish rolling when the temperature difference between the head and the tail is less than or equal to 25 ℃ and the temperature is reduced to the target rolling temperature of the two stages. Thereby accelerating the cooling speed, shortening the cooling time, inhibiting the growth of crystal grains, reducing the size of austenite crystal grains, improving the obdurability of the finished steel plate, and improving the internal quality and the service performance of the steel plate while improving the operating rate and the yield of a rolling mill. The method of the invention is simple, easy to master and operate, and can quickly achieve the effect without adding any equipment and investment.
Description
Technical field
The invention belongs to the steel rolling process technical field, relate in particular to a kind of controlled rolling and controlled cooling, shorten the method for engineering machinery with steel intermediate blank time of staying temperature.
Background technology
Appearance along with a series of pulling domestic demands of China, the policy of maintaining fast yet steady economic development and measure, the construction machinery industry materials demand also constantly increases, and drive engineering machinery and significantly increase, thereby constructed the huge platform of an engineering machinery with steel production with the demand of steel.Use in the steel order in engineering machinery, the kind that has the call is the engineering machinery steel of intensity 690MPa, and the quality and the processing serviceability of steel plate also had higher requirement.
At present, the state-of-the-art production method of domestic and international project steel for engineering mechanism purpose is to adopt that TMCP is rolling to be controlled rolling and cooling and steel plate carried out temper, improves the integrated performance indexs such as intensity, toughness and welding of steel plate, to satisfy user's comprehensive instructions for use.
In actual production process, engineering machinery adopts the two-section low-temperature rolling technique mostly with steel, to improve the metallographic structure of steel plate, the combination property and the quality of control steel plate.But, since steel billet finish a stage rolling after, the steel billet cooling a period of time after needing to roll for the uniformity that improves crystal grain is promptly treated the intermediate blank of temperature.At present, what the intermediate blank after in the world a stage being rolled generally adopted is the ground mode of cooling off naturally in air, and the mode of this air cooling needs intermediate blank to treat the chronic of temperature cooling in air, treat the also difference to some extent of warm time according to the thickness difference, but average time of staying temperature will reach about 600s.The production capacity and the operating rate of milling train have not only been had a strong impact on, and because intermediate blank waiting as long at high temperature, making a stage depress the crystal grain that is broken greatly constantly grows up again, directly reduce the intensity and the toughness of finished product steel plate after the finish rolling, influenced the inherent quality of steel plate and user's instructions for use.
Summary of the invention
Purpose of the present invention is exactly at above-mentioned defective, aims to provide a kind of simplely, is convenient to operation, can effectively suppress the intermediate blank grain growth, shortens the intermediate blank time of staying temperature, thereby improves the method for steel plate combination property and operating rate of rolling mill.
For this reason, the technical solution that the present invention taked is:
A kind of engineering machinery is treated the method that temperature control is rolled with the steel intermediate blank, takes cooling fast to combine control cooling velocity and time of staying temperature, zerolling engineering machinery steel intermediate blank with the air cooling.
Its specific embodiment is:
After cold base heating is come out of the stove, through high-pressure water descaling 1 or 3 passages;
Milling train start rolling temperature 〉=1050 ℃, finishing temperature 〉=980 ℃, the single pass heavy deformation in 3 roads, back is 10%～20%;
Set pattern, cooldown rate and the temperature of control cooling; The intermediate blank of outgoing gauge 〉=100mm is sent into accelerate cooling system, slowly cool off with the cooldown rate of 2～5K/s; After steel billet upper surface temperature is cooled to 880～920 ℃, steel billet is shifted out from accelerate cooling system, treat temperature 60～250s time before returning to milling train, promptly reach two-stage target rolling temperature after treating intermediate blank head, the tail temperature difference≤25 ℃ and being cooled to 850～890 ℃, send into finishing mill and carry out two-stage finish rolling.
Beneficial effect of the present invention is:
Owing to intermediate blank is changed into air cooling and is controlled the two-part type of cooling that cooling combines fast by complete air cooling, thereby accelerated cooling velocity, shortened cool time, make the intermediate blank time of staying temperature shorten to 150s by 600s.Simultaneously, improve the operating efficiency of whole rolling line, accelerated rhythm of production, helped the raising of rolling mill yield.Particularly because take to force to cool off, the method for fast cooling, suppressed the speed of grain growth; Shorten cool time in addition, compressed the time of grain growth, thereby reduced austenite grain size, can obviously improve the obdurability of finished product steel plate, improve the inherent quality and the serviceability of steel plate.The inventive method is simple, is easy to grasp and operation, need not increase any equipment and just can speed become effective with investment.The intermediate blank that is particularly useful for thickness 〉=100mm.
Description of drawings
Accompanying drawing is that engineering machinery is treated temperature control rolling method process chart with the steel intermediate blank.
The specific embodiment
Below, the invention will be further described in conjunction with the accompanying drawings and embodiments.
By accompanying drawing as seen, intermediate blank of the present invention treats that the main technique step of temperature control rolling method is five roads, i.e. heating furnace heating-high-pressure water descaling-zerolling-control cooling system spray water-cooled-homogenising air cooling, and the intermediate blank behind the air cooling is sent into finishing mill and is carried out finish rolling.
Embodiment 1:
With specification is that the cold base of 300 * 1900 * 3200mm is sent into heating furnace and heated 1160 ℃ of heating target temperatures;
After heating is come out of the stove, carry out high-pressure water descaling 1 passage;
Steel billet after the de-scaling directly enters milling train and is rolled, 1070 ℃ of start rolling temperatures, and 1000 ℃ of finishing temperatures, the single pass heavy deformation in 3 roads, back is 14%; Rolling back intermediate blank thickness is 130mm;
Intermediate blank after will rolling is sent into accelerate cooling system, sprays water-cooled with the cooldown rate of 4K/s;
After steel billet is cooled to 900 ℃, steel billet is moved out to milling train from accelerate cooling system before, place air to treat warm 120s;
When waiting to be cooled to 880 ℃, be 20 ℃, reach two-stage target rolling temperature, send into finishing mill and be rolled into 50 * 2800 * 13000mm finished product steel plate with pyrometer measurement intermediate blank head, the tail temperature difference.
Embodiment 2:
With specification is that the cold base of 300 * 1900 * 4500mm is sent into heating furnace and heated 1180 ℃ of heating target temperatures;
After heating is come out of the stove, carry out high-pressure water descaling 3 passages;
Steel billet after the de-scaling directly enters milling train and is rolled, 1050 ℃ of start rolling temperatures, and 990 ℃ of finishing temperatures, the single pass heavy deformation in 3 roads, back is 19%; Rolling back intermediate blank thickness is 150mm;
Intermediate blank after will rolling is sent into accelerate cooling system, sprays water-cooled with the cooldown rate of 3K/s;
After steel billet is cooled to 880 ℃, steel billet is moved out to milling train from accelerate cooling system before, place air to treat warm 200s;
When waiting to be cooled to 860 ℃, be 18 ℃, reach two-stage target rolling temperature, send into finishing mill and be rolled into 70 * 2800 * 13000mm finished product steel plate with pyrometer measurement intermediate blank head, the tail temperature difference.
Claims (4)
1. an engineering machinery is treated the method that temperature control is rolled with the steel intermediate blank, it is characterized in that, takes cooling fast to combine control cooling velocity and time of staying temperature, zerolling engineering machinery steel intermediate blank with the air cooling; Specific embodiment is:
After cold base heating is come out of the stove, through high-pressure water descaling 1 or 3 passages;
Milling train start rolling temperature 〉=1050 ℃, finishing temperature 〉=980 ℃, the single pass heavy deformation in 3 roads, back is 10%～20%;
Set pattern, cooldown rate and the temperature of control cooling; The intermediate blank of outgoing gauge 〉=100mm is sent into the cooling that accelerate cooling system carries out slow cooling rate; After steel billet is cooled to 880～920 ℃, steel billet is shifted out from accelerate cooling system, treat temperature a period of time before returning to milling train, treat that the intermediate blank temperature evenly and after being cooled to 850～890 ℃ promptly reaches two-stage target rolling temperature, sends into finishing mill and carries out two-stage finish rolling.
2. engineering machinery according to claim 1 is treated the method that temperature control is rolled with the steel intermediate blank, it is characterized in that, described slow cooling rate is the cooldown rate of 2～5K/s.
3. engineering machinery according to claim 1 is treated the method that temperature control is rolled with the steel intermediate blank, it is characterized in that, described time of staying temperature is 60～250s.
4. engineering machinery according to claim 1 is treated the method that temperature control is rolled with the steel intermediate blank, it is characterized in that, described intermediate blank temperature evenly is meant the head, the tail temperature difference≤25 ℃ of intermediate blank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102487868A CN102107220A (en) | 2009-12-25 | 2009-12-25 | Method for controlling temperature of steel intermediate billet to be rolled for engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102487868A CN102107220A (en) | 2009-12-25 | 2009-12-25 | Method for controlling temperature of steel intermediate billet to be rolled for engineering machinery |
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| CN102107220A true CN102107220A (en) | 2011-06-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527734A (en) * | 2012-02-27 | 2012-07-04 | 宝山钢铁股份有限公司 | Steel plate controlling and rolling method |
| CN110560486A (en) * | 2019-09-04 | 2019-12-13 | 中冶赛迪工程技术股份有限公司 | hot-rolled strip steel endless rolling intermediate billet connecting device and method |
| CN115069785A (en) * | 2021-03-15 | 2022-09-20 | 宝山钢铁股份有限公司 | Control method for batch temperature waiting of intermediate blanks |
-
2009
- 2009-12-25 CN CN2009102487868A patent/CN102107220A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527734A (en) * | 2012-02-27 | 2012-07-04 | 宝山钢铁股份有限公司 | Steel plate controlling and rolling method |
| CN102527734B (en) * | 2012-02-27 | 2014-10-29 | 宝山钢铁股份有限公司 | Steel plate controlling and rolling method |
| CN110560486A (en) * | 2019-09-04 | 2019-12-13 | 中冶赛迪工程技术股份有限公司 | hot-rolled strip steel endless rolling intermediate billet connecting device and method |
| CN110560486B (en) * | 2019-09-04 | 2024-02-23 | 中冶赛迪工程技术股份有限公司 | Device and method for connecting endless rolling intermediate billets of hot rolled strip steel |
| CN115069785A (en) * | 2021-03-15 | 2022-09-20 | 宝山钢铁股份有限公司 | Control method for batch temperature waiting of intermediate blanks |
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Application publication date: 20110629 |