CN101157096A - Technique of controlling and cooling hot-rolled seamless tube online - Google Patents
Technique of controlling and cooling hot-rolled seamless tube online Download PDFInfo
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- CN101157096A CN101157096A CNA2007101501924A CN200710150192A CN101157096A CN 101157096 A CN101157096 A CN 101157096A CN A2007101501924 A CNA2007101501924 A CN A2007101501924A CN 200710150192 A CN200710150192 A CN 200710150192A CN 101157096 A CN101157096 A CN 101157096A
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Abstract
The invention provides a method for the on line controlled cooling process of a hot rolling seamless steel pipe, the method is realized by a controlled cooling system, and the method comprises the steps that a blower fan and a water pump are started up; the controlled cooling device starts working; the rolled temperature of the seamless steel pipe which is rolled by a three-roller slight tension sizing mill is between 950 DEG C and 980 DEG C, when the tail of the seamless steel pipe is not completely rolled out from the end of the mill housing of the sizing mill, the rotation of the seamless steel pipe can not happen; when the tail of the seamless steel pipe completely breaks away from the end of the mill housing, and is detected by a thermometal detector, meanwhile a changeable angle roller way declines on the horizontal plane according to a set angle, to lead the seamless steel pipe to go forward in spiral way along the rolling direction by the own axis till the whole seamless steel pipe passes through completely; the cooling speed of the process requirement can be achieved finally; subsequently the seamless steel pipe enters into a chain-type cooling bed to implement the air cooling to the room temperature. The invention has the advantages that the controlled cooling process controls the cooling speed of the hot rolling seamless steel pipe after the rolling through the air-mist cooling, to meet the purpose of improving the metallographic structure and the comprehensive mechanical property of the seamless steel pipe.
Description
Technical field
The present invention relates to the process of control cooling in a kind of steel pipe's production, particularly a kind of process of hot rolled seamless steel tube On-line Control cooling.
Background technology
At present, in the sheet material production of metallurgy industry, excellent wire production, the process procedure of control cooling is extremely important, because the difference of material section configuration, the type of cooling that is adopted is also different.As broad hot strip (hot rolling plate), what then adopt is the water under high pressure laminar flow type of cooling; What the rod wire rod rolled back control cooling utilization is turbulent flow tubular type cooling system.
More than the common ground of the control type of cooling is and utilizes water under high pressure to reach the purpose that improves the steel comprehensive mechanical performance by the cooling velocity of control steel.
Because the hot rolled seamless steel tube section configuration up to now, still finds no the report that closes the cooling of hot rolled seamless steel tube On-line Control at home and abroad.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the process of hot rolled seamless steel tube On-line Control cooling of the present invention, one of purpose is for carbon content higher relatively structural carbon steel and structural alloy steel, the grain refinement that the quick process for cooling in back will make middle thick-walled seamless steel pipes is rolled in employing, and the tissue of acquisition composite-like, help the raising of steel pipe integral combination property;
Two of purpose is the seamless steel pipes for the low Mn content of low C, cooling fast after rolling, obtain the acicular ferrite structure and the tempered sorbite tissue of top layer high strength, high tenacity, the remarkable refinement of inner equiaxed ferritic grain, the steel pipe integral comprehensive mechanical property increases substantially.
Three of purpose is to roll the fast acicular ferrite, the ULCB tissue that are produced of process for cooling of back, for develop thin-walled from now on, middle thick-walled pipe spool provides a kind of new technology approach.
Four of purpose is that the type of cooling that adopts is that the air-water mixture that blower fan and water pump provide can obtain better cooling effect.
For achieving the above object, technical solution of the present invention provides a kind of process of hot rolled seamless steel tube On-line Control cooling, this method realizes by the control cooling system, the control cooling system comprises: control cooling device, roller-way system, water supply/air feed system, automatic control system, described control cooling device is installed between three roller slight stretch sizing mills and the chain-type cooling bed, and this process may further comprise the steps:
Start blower fan, water pump in described water supply/air feed system;
The control cooling device is started working;
From the rolling hot rolled seamless steel tube of three roller slight stretch sizing mills, it rolls the back temperature between 950 ℃～980 ℃, when the seamless steel pipe afterbody did not shut out three roller slight stretch sizing mill last stands fully, the conveying roller axis normal was in the rolling line direction, and seamless steel pipe does not rotate;
When the seamless steel pipe afterbody breaks away from the most last three roller slight stretch sizing mill frames fully, and when being detected by hot metal detector HMD-1, I, II, III group variable-angle roller-way press the set angle inclination simultaneously on horizontal plane, seamless steel pipe is advanced along the rolling direction spiral with self axis;
When the seamless steel pipe afterbody breaks away from hot metal detector HMD-1 in the described automatic control system fully, HMD-2 in the described automatic control system still can detect seamless steel pipe at this moment, to prevent described HMD-1 misoperation, I, the II of described roller-way system, III group variable-angle roller-way simultaneously on horizontal plane by setting (6 degree～12 degree, decide according to different diameter of steel tube) angle tilts, and seamless steel pipe is advanced along the rolling direction spiral with self axis;
Pass through the control cooling device fully until whole seamless steel pipe;
When the seamless steel pipe afterbody leaves the control cooling device fully, the roller-way that has tilted resets simultaneously, by HMD-3 detection signal in the described automatic control system and time-delay control, and described III group roller-way still keeps tilting, seamless steel pipe of every cooling, described I, II group roller-way tilts and resets once;
By hot prosecution system, the finished product seamless steel pipe of temperature between 650 ℃～780 ℃ enters described chain-type cooling bed and implements air cooling to room temperature after cooling off;
Described subsequently I, II, III group roller-way all reset, and the control that begins next steel pipe is cold.
Effect of the present invention be this control process for cooling be one by simplify technology, the aerosol type of cooling has broken through traditional high pressure laminar flow type of cooling, cooling effect to steel pipe is more easy to control, the water film that cooling forms because aerosol can break through steel tube surface, therefore, can obtain better cooling effect, to reach the purpose of improving the seamless steel pipe metallographic structure and improving comprehensive mechanical property, improved product competitiveness.
Description of drawings
Fig. 1 is for of the present invention when the steel pipe afterbody does not break away from sizing mill fully, roller-way perpendicular to the process flow of rolling line direction to schematic diagram;
Fig. 2 is for of the present invention when the steel pipe afterbody breaks away from sizing mill fully, and three groups of roller-ways are pressed the process flow of certain angle inclination to schematic diagram on horizontal plane;
Fig. 3 is for of the present invention when the steel pipe afterbody leaves the cooling zone fully, and the process flow that I, II group roller-way resets is to schematic diagram.
The specific embodiment
Reaching embodiment is in conjunction with the accompanying drawings described in detail the step process of the process of hot rolled seamless steel tube On-line Control of the present invention cooling.
The process of hot rolled seamless steel tube On-line Control cooling of the present invention realizes by the control cooling system, the control cooling system comprises: control cooling device, roller-way system, water supply/air feed system, automatic control system, the control cooling device is installed between three roller slight stretch sizing mills and the chain-type cooling bed, and this control cooling device includes three kinds the type of cooling: high wind cooling, aerosol cooling and high current cooling.Can select one of them according to the difference of kind, specification and the technological requirement of steel pipe.When rolling seamless steel pipe is selected process for cooling for use, must before production, will control cooling device and open, finish until batch production.
The process main processes of hot rolled seamless steel tube On-line Control cooling of the present invention is as follows:
Start blower fan (1 usefulness 1 is equipped with), start water pump (during the high current cooling, starting 2 simultaneously);
When the seamless steel pipe afterbody did not pass three roller slight stretch sizing mills fully, roller-way was perpendicular to the rolling line direction, and seamless steel pipe does not rotate, as shown in Figure 1.
(this moment, HMD-2 still detected steel pipe when the seamless steel pipe afterbody breaks away from hot metal detector HMD-1 fully, prevent the HMD-1 misoperation), I, II, III group variable-angle roller-way are pressed certain angle simultaneously and are tilted on horizontal plane, seamless steel pipe is advanced with the rotation of self axis, to roll the seamless steel pipe of back temperature between 950 ℃～980 ℃ and directly send into the cooling of control cooling device, finish until whole seamless steel pipe cooling, as shown in Figure 2.
When the seamless steel pipe afterbody leaves the cooling zone fully, reset when tilting (by HMD-3 signal and time-delay control), and III group roller-way still keeps tilting, as shown in Figure 3.
Seamless steel pipe of every cooling, I, II group roller-way " tilt with reset " once, by hot prosecution system, the finished product seamless steel pipe of temperature between 650 ℃～780 ℃ enters chain-type cooling bed enforcement air cooling subsequently to room temperature through cooling off after; After process for cooling finished, I, II, III group roller-way all resetted, and the control that begins next steel pipe is cold.
Three groups of variable-angle roller-ways of roller-way system guarantee the cooling stage of seamless steel pipe after implementing sizing, according to the motion mode even running of technological requirement.
Water supply air feed system capital equipment comprises: equipment such as water pump, blower fan, flow control valve.The about 750M of total flow
3/ h.Water quality requirement is: granularity≤0.5mm; Oil content≤15mg/L; Suspension≤60mg/L; PH value: 7 ~ 8.5; Water temperature :≤40 ℃.
Automatic control system is the control of basic automatization level, and the basic automatization computer mainly is responsible for control that the variable-angle roller-way tilts/reset and data demonstration etc., and seamless steel pipe velocity of rotation and roller-way velocity of rotation and angle of inclination are all had setting.The PLC main frame adopts SIEMENS S7-300 computer system, carries out data acquisition and logic control etc.After guaranteeing that steel pipe breaks away from three roller slight stretch sizing mills fully, the inclination of variable-angle roller-way and raising speed; After guaranteeing that seamless steel pipe breaks away from the variable-angle roller-way fully, the resetting and reduction of speed of variable-angle roller-way; Guarantee the opening and closing of cooler close/open valve.
Under this kind working method, finish FEEDFORWARD CONTROL function after following the tracks of end to end, feeding back of seamless steel pipe and three roller slight stretch sizing mills are thrown steel by basic automatization PLC S7-400.
Embodiment
Heat examination in early stage has successively been tested ∮ 140 * 13mm, ∮ 168 * 16mm, three kinds of specifications of ∮ 180 * 22mm based on the heat examination in batches that enters of apparatus adaptability debugging, and steel grade is 20# and 45#, and the control cooling device selects to adopt the aerosol type of cooling.
Can find out that from recording curve the finishing temperature behind the sizing is controlled temperature after cold according to the wall thickness difference of caliber generally in 950 ℃～980 ℃ scopes, generally at 680 ℃～780 ℃, temperature drop value is generally between 200 ℃～270 ℃.Temperature drop value changes with the variation of thickness of steel pipe, and tube wall is thin more, and temperature drop value is big more, and maximum is about 270 ℃; Tube wall is thick more, and temperature drop value is slowed down, and minimum of a value is about 200 ℃.
Claims (2)
1. the process of hot rolled seamless steel tube On-line Control cooling, this method realizes by the control cooling system.The control cooling system comprises: control cooling device, roller-way system, water supply/air feed system, automatic control system, and described control cooling device is installed between three roller slight stretch sizing mills and the chain-type cooling bed, and this process may further comprise the steps:
Start blower fan, water pump in described water supply/air feed system;
Online aerosol cooling device is started working;
From the rolling hot rolled seamless steel tube of three roller slight stretch sizing mills, it rolls the back temperature between 950 ℃～980 ℃, when the seamless steel pipe afterbody did not shut out three roller slight stretch sizing mill last stands fully, the conveying roller axis normal was in the rolling line direction, and seamless steel pipe does not rotate;
When the seamless steel pipe afterbody breaks away from the most last three roller slight stretch sizing mill frames fully, and when being detected by hot metal detector HMD-1, I, II, III group variable-angle roller-way press the set angle inclination simultaneously on horizontal plane, seamless steel pipe is advanced along the rolling direction spiral with self axis;
When the seamless steel pipe afterbody breaks away from hot metal detector HMD-1 in the described automatic control system fully, HMD-2 in the described automatic control system still can detect seamless steel pipe at this moment, to prevent described HMD-1 misoperation, I, the II of described roller-way system, III group variable-angle roller-way press the set angle inclination simultaneously on horizontal plane, seamless steel pipe is advanced along the rolling direction spiral with self axis;
Pass through online aerosol cooling device fully until whole seamless steel pipe;
When the seamless steel pipe afterbody leaves the control cooling device fully, the roller-way that has tilted resets simultaneously, by HMD-3 detection signal in the described automatic control system and time-delay control, and described III group roller-way still keeps tilting, seamless steel pipe of every cooling, described I, II group roller-way tilts and resets once;
By hot prosecution system, the finished product seamless steel pipe of temperature between 650 ℃～780 ℃ enters described chain-type cooling bed and implements air cooling to room temperature after cooling off;
Described subsequently I, II, III group roller-way all reset, and the control that begins next steel pipe is cold.
Described water pump is closed in rolling end, closes described blower fan.
2. the process of hot rolled seamless steel tube On-line Control cooling according to claim 1 is characterized in that: the angle of inclination that described variable-angle roller-way is set is 6 degree～12 degree.
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| CN102189107A (en) * | 2010-02-17 | 2011-09-21 | 科克斯技术有限及两合公司 | Rolling apparatus for producing tubular products and method for producing tubular products |
| CN103084412A (en) * | 2012-12-12 | 2013-05-08 | 衡阳华菱钢管有限公司 | Process controlling method in production of N80-1 non-quenching seamless oil sleeve |
| CN103128108A (en) * | 2013-03-22 | 2013-06-05 | 宝鸡石油钢管有限责任公司 | On-line cooling control method and device for improving strength and tenacity of high-frequency-welding (HFW) welded pipe after being hot rolled |
| CN103357659A (en) * | 2012-03-27 | 2013-10-23 | 上海梅山钢铁股份有限公司 | Mobile-type strip steel flattening device and mobile-type strip steel flattening method |
| CN103424467A (en) * | 2013-07-18 | 2013-12-04 | 江苏赛福探伤设备制造有限公司 | Automatic magnetic flaw detection method and device for steel pipe |
| CN106269916A (en) * | 2016-10-25 | 2017-01-04 | 东北大学 | A kind of hot rolled seamless steel tube On-line Control cooling system and process |
| CN106269931A (en) * | 2016-10-25 | 2017-01-04 | 东北大学 | A kind of method of hot rolled seamless steel tube on-line continuous cooling |
| CN106555045A (en) * | 2015-09-24 | 2017-04-05 | 宝山钢铁股份有限公司 | A kind of seamless steel pipe press quenching cooling technique and manufacture method of utilization waste heat |
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| CN107971353A (en) * | 2016-10-25 | 2018-05-01 | 宝山钢铁股份有限公司 | The roller-way control method of steel pipe on-line cooling |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4747290A (en) * | 1983-12-20 | 1988-05-31 | Tubemakers Of Australia Pty., Ltd. | Roller cooling table |
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| CN102189107A (en) * | 2010-02-17 | 2011-09-21 | 科克斯技术有限及两合公司 | Rolling apparatus for producing tubular products and method for producing tubular products |
| CN103357659A (en) * | 2012-03-27 | 2013-10-23 | 上海梅山钢铁股份有限公司 | Mobile-type strip steel flattening device and mobile-type strip steel flattening method |
| CN103357659B (en) * | 2012-03-27 | 2015-10-28 | 上海梅山钢铁股份有限公司 | The portable flattening device of band steel and levelling method |
| CN103084412B (en) * | 2012-12-12 | 2016-05-11 | 衡阳华菱钢管有限公司 | Process control method in the non-modified seamless tubing and casing production of N80-1 |
| CN103084412A (en) * | 2012-12-12 | 2013-05-08 | 衡阳华菱钢管有限公司 | Process controlling method in production of N80-1 non-quenching seamless oil sleeve |
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| CN103128108B (en) * | 2013-03-22 | 2015-12-02 | 宝鸡石油钢管有限责任公司 | A kind of online controlled cooling method and device improving obdurability after the hot rolling of HFW welded tube |
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| CN103424467B (en) * | 2013-07-18 | 2016-10-05 | 江苏赛福探伤设备制造有限公司 | A kind of steel pipe magnetic flaw detection automatic testing method and device |
| CN106555045A (en) * | 2015-09-24 | 2017-04-05 | 宝山钢铁股份有限公司 | A kind of seamless steel pipe press quenching cooling technique and manufacture method of utilization waste heat |
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| CN111589879B (en) * | 2020-04-29 | 2021-06-11 | 东北大学 | Control method for improving texture uniformity of thick-wall seamless steel tube online cooling process |
| CN111589876A (en) * | 2020-04-29 | 2020-08-28 | 东北大学 | Hot-rolled seamless steel tube on-line cooling process tracking control system and method |
| CN113042539A (en) * | 2021-03-25 | 2021-06-29 | 德龙钢铁有限公司 | Cooling method for fine control of microstructure of hot-rolled strip steel |
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Effective date of registration: 20190626 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |