CN1189400A - Cooling control method used for steels after hot rolled - Google Patents
Cooling control method used for steels after hot rolled Download PDFInfo
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- CN1189400A CN1189400A CN98100444A CN98100444A CN1189400A CN 1189400 A CN1189400 A CN 1189400A CN 98100444 A CN98100444 A CN 98100444A CN 98100444 A CN98100444 A CN 98100444A CN 1189400 A CN1189400 A CN 1189400A
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Abstract
A cooling control method for hot-rolled hard steel wire includes 4 stages, which include water cooling from hot mill to wire-drawing machine, water-steam cooling from the wire-drawing machine to steam cooler, natural cooling in the 6 m range after steam cooler, and quick cooling from end of natural cooling stage to coiling machine. The steel wire cooled with said method has higher mechanical performance, high ratio of sorbite structure, and improved working properties.
Description
The invention belongs to the control cooling field behind the steel hot rolling.Mainly be applicable to the control cooling after the hot rolling of steel rigid line.
Cooling velocity after the hot rolling of control steel rigid line can obtain a high proportion of tissue of fine pearlite preferably (being the sorbite tissue), and this thin pearlite can improve the follow-up deep processing performance of rigid line, improves the final performance of lumber recovery and product.
In the prior art, Stevr rub cooling means be behind the wire rolling control cooling means in a more typical illustration (" fast mill wire production ", metallurgical industry publishing house, nineteen ninety-five, P330 page or leaf).This control cooling means adopts three sections types of cooling:
Phase I---quick cooling stage adopts telescopic water spray cooling, requires to be quickly cooled to phase transition temperature behind the wire rolling;
Second stage---the air-cooled stage is the phase transformation stage, by the air-cooled control but speed of freezing, in the hope of obtaining pearlitic structrure;
Phase III---the rapid air-cooled stage, quicken cooling, reduce the generation of iron scale.
This method is because the phase I cooling velocity is excessive, wire surface easily produces face crack, generate reasons such as chilling tissue simultaneously owing to the top layer, core fails to be cooled to uniform temperature, thereby limited final cooling temperature, and can not make whole wire rod reach phase transition temperature, just can reach phase transition temperature after need entering air-cooled certain zone of second stage, cause the phase transition process of second stage insufficient, can not obtain satisfied tissue.
The object of the present invention is to provide a kind of control cooling means that can make after the steel rigid line hot rolling that wire rod finally obtains microscopic structure (sorbite) preferably and excellent deep processing performance.
At above-mentioned purpose, the present invention is a kind of be used for the hot rolling of steel rigid line after the control cooling means divide four-stage, accompanying drawing 1 be a process chart of the present invention, shows the four-stage division is as follows:
Phase I---water-cooled section, hot-rolling mill adopt sleeve to wear water cooling to the Laying head section, and cooling velocity is controlled at 200-300 ℃/second, and the temperature that wire rod enters before the Laying head is controlled at more than 750 ℃;
Second stage---steam cooling section, vapour device for cooling institute area under one's jurisdiction section is a cooling medium with steam behind the Laying head, and the cold cooling velocity of steam vapour is controlled at 20-30 ℃ of/second scope, and the speed of service of control wire rod on rollgang is the 0.8-1.3 meter per second;
Phase III---natural cooling section from vapour device for cooling source mouth 6 meters inner section extremely subsequently, adopts the nature cooling;
Quadravalence section---quick cooling stage, the phase III end adopts air blast cooling to rolling up the preceding section of collection machine.
Phase I is for wearing water cooling, by regulating hydraulic pressure and flow-control cooling velocity at 200-300 ℃/second, its purpose one is in order to reduce secondary oxidation, two will prevent the appearance of wire surface chilling tissue, cooling velocity can not be low excessively, the wire rod of big specification particularly, after the phase I cooling, the temperature of wire rod (promptly enter laying head before temperature) is controlled at more than 750 ℃.
Second stage adopts vapour but cold, its objective is with wire rod from go into before the Laying head more than 750 ℃, stably be cooled to 600-650 ℃, for the phase transformation of phase III provides sufficient condition.For reaching this purpose, the one, the control cooling velocity, the one, the control wire rod speed of service, by evidence, the cold but speed of vapour is controlled at 20-30 ℃/second and is advisable, and the speed of service of wire rod on rollgang is the 0.8-1.3 meter per second.The steam cooling realizes by vapour device for cooling after being assemblied in Laying head.The cold medium of vapour can be the steam of heating or the steam that produces with ultrasonic wave.Steam by the vapour device for cooling is kept pressure-fired at arrival end.
Phase III is the phase transformation stage, and wire rod is 600-650 ℃ through the cooled temperature of steam, and the nature cooling is adopted with being the phase III in the cold back of vapour, helps phase transformation.Make several move clock in of temperature after vapour is cold of wire rod, still can be stabilized in 600-650 ℃, during this, make austenite, fully carried out, finally obtain a large amount of tiny pearlite to tiny pearlitic transformation mutually.
The quadravalence section is quick cooling stage.Adopt air blast cooling, wire rod is cooled to rapidly below 230 ℃, its objective is the generation that reduces iron scale, improve lumber recovery.
Now the invention will be further described in conjunction with the accompanying drawings.
Accompanying drawing 1 is equipment of the present invention and process flow diagram.
The master that accompanying drawing 2,3 is respectively vapour device for cooling of the present invention looks and left TV structure schematic diagram.
Found out that by Fig. 1 steel 8 enter the device for cooling 2 of phase I and carry out water after hot-rolling mill 1 is rolling Cold, enter Laying head 3 behind the wire water-cooled, entering immediately vapour device for cooling 4, to carry out vapour cold, after wire rod vapour is cold Enter phase III nature cooling zone 5, natural cooling zone is established 6 meters long, naturally enters the 4th after the cooling again The air blast cooling district 6 in stage carries out air blast cooling, and wire rod is cooled to rapidly below 230 ℃, immediately line Material enters volume collection machine 7, and the collection rolling up dish for steel becomes finished product, finishes whole control cooling procedure.
In accompanying drawing 2,10 is steam inlet pipe, and 11 is cooling chamber, and 12 for bleeding and the conduit that catchments, and 13 are Rollgang, 14 is wire rod, 15 is driving end. The vapour device for cooling is by steam inlet pipe 10, cooling chamber 11 and Bleed and the conduit 12 of catchmenting forms. Steam inlet pipe 10 with bleed and catchment conduit 12 all with cooling chamber 11 mutually Connect and to communicate, whole cooling chamber 11 be in the wire rod rollgang around, i.e. rollgang and top fortune thereof The equal ladle cover of wire rod of row is in cooling chamber 11.
Compared with prior art, the present invention has following advantage:
(1) control cooling result can obtain a large amount of tiny pearlitic structrures in metallographic structure, thereby Wire rod has good deep processing performance.
(2) in cooling procedure, wire surface does not crack or ftractures, and does not produce the chilling tissue yet, Guarantee the final excellent properties of wire rod.
(3) lumber recovery height, follow-up additional processing cost reduces.
Embodiment
According to controlling cooling means after the steel rigid line of the present invention hot rolling, adopting No. 70 steel is that blank carries out three batches of tests.Wire rod enters the control cooling stage after hot rolling.Three batches of tests the control process for cooling and the parameters that are adopted are as shown in table 1.After being cooled to finished product, and mechanical property test is carried out in sampling and metallographic structure is checked, and measured average mechanical property and sorbitic rate result are as shown in table 2.
Table 1 embodiment controls the technological parameter of cooling
Table 2 embodiment controls cooling back wire rod mechanical property and sorbitic rate
Claims (5)
1, a kind of being used for controlled cooling means after the hot rolling of steel rigid line, comprises water-cooled and air cooling stage, it is characterized in that this control cooling means divides four-stage:
Phase I---water-cooled section, hot-rolling mill adopt the sleeve spray to wear water cooling to the Laying head section, and cooling velocity is controlled at 200-300 ℃/second, and the temperature that wire rod enters before the Laying head is controlled at more than 750 ℃;
Second stage---steam cooling section, vapour device for cooling institute area under one's jurisdiction section is a cooling medium with steam behind the Laying head, and the cold cooling velocity of steam vapour is controlled at 20-30 ℃ of/second scope, and the speed of service of control wire rod on rollgang is the 0.8-1.3 meter per second;
Phase III---natural cooling section to subsequently 6 meters inner section, adopts the nature cooling from vapour device for cooling exit;
Quadravalence section---quick cooling stage, phase III end is adopted air blast cooling to rolling up the preceding section of collection machine.
2, cooling means according to claim 1 is characterized in that the steam cooling stage in second stage, keeps pressure-fired by the steam of vapour device for cooling at arrival end.
3, cooling means according to claim 1 is characterized in that the wire temperature in vapour device for cooling exit is controlled at 600-650 ℃ of scope;
4, cooling means according to claim 1 is characterized in that the cold cooling medium of vapour can be the steam of heating or the steam that produces with ultrasonic wave.
5, a kind of being used for controlled cooling means second stage---the vapour device for cooling in cold stage of vapour after the hot rolling of the described steel rigid line of claim 1, it is characterized in that this device is by steam inlet pipe (10), cooling chamber (11) with bleed and the conduit that catchments (12) is formed, steam inlet pipe (10) and bleed and the conduit that catchments (12) all links with cooling chamber (11) and communicates, whole cooling chamber (11) be in the wire rod rollgang around, promptly rollgang and the equal ladle cover of top operation wire rod thereof are in cooling chamber (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98100444A CN1064567C (en) | 1998-02-23 | 1998-02-23 | Cooling control method used for steels after hot rolled |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98100444A CN1064567C (en) | 1998-02-23 | 1998-02-23 | Cooling control method used for steels after hot rolled |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1189400A true CN1189400A (en) | 1998-08-05 |
| CN1064567C CN1064567C (en) | 2001-04-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98100444A Expired - Fee Related CN1064567C (en) | 1998-02-23 | 1998-02-23 | Cooling control method used for steels after hot rolled |
Country Status (1)
| Country | Link |
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| CN (1) | CN1064567C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453194C (en) * | 2005-12-07 | 2009-01-21 | 首钢总公司 | Control cooling method of resolving self-break while producing high-carbon wire rod |
| CN100489121C (en) * | 2007-02-07 | 2009-05-20 | 钢铁研究总院 | Controlled cooling process and water cooler for high carbon and chromium bearing steel pipe blank after hot rolling |
| CN102248012A (en) * | 2011-07-26 | 2011-11-23 | 杨海西 | Cooling device and method for hot-rolling process of wire rod |
| CN102303052A (en) * | 2011-07-21 | 2012-01-04 | 中冶东方工程技术有限公司 | Intermediate additional cooling equipment and method for hot continuous rolling plate band |
| CN102974629A (en) * | 2012-12-24 | 2013-03-20 | 江苏西城三联控股集团有限公司 | Aerial fog cooling process method of hot rolling bar |
| CN104550275A (en) * | 2014-12-26 | 2015-04-29 | 钢铁研究总院 | Method and device for spray evaporation cooling of hot-rolled high-strength rebar |
| CN108396127A (en) * | 2017-02-08 | 2018-08-14 | 鞍钢股份有限公司 | A method of lead bath wire rod is exempted from the production of aerating bubble in EDC sinks |
| CN110340155A (en) * | 2019-07-03 | 2019-10-18 | 首钢水城钢铁（集团）有限责任公司 | A kind of control production method for exempting from pickling SWRH82B gren rod iron scale |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN164702B (en) * | 1984-10-09 | 1989-05-13 | Morgan Construction Co | |
| US4580353A (en) * | 1984-10-31 | 1986-04-08 | Morgan Construction Company | Apparatus and method for air cooling hot rolled steel rod |
-
1998
- 1998-02-23 CN CN98100444A patent/CN1064567C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100453194C (en) * | 2005-12-07 | 2009-01-21 | 首钢总公司 | Control cooling method of resolving self-break while producing high-carbon wire rod |
| CN100489121C (en) * | 2007-02-07 | 2009-05-20 | 钢铁研究总院 | Controlled cooling process and water cooler for high carbon and chromium bearing steel pipe blank after hot rolling |
| CN102303052A (en) * | 2011-07-21 | 2012-01-04 | 中冶东方工程技术有限公司 | Intermediate additional cooling equipment and method for hot continuous rolling plate band |
| CN102303052B (en) * | 2011-07-21 | 2013-09-18 | 中冶东方工程技术有限公司 | Intermediate additional cooling equipment and method for hot continuous rolling plate band |
| CN102248012A (en) * | 2011-07-26 | 2011-11-23 | 杨海西 | Cooling device and method for hot-rolling process of wire rod |
| CN102248012B (en) * | 2011-07-26 | 2013-05-08 | 杨海西 | Cooling device and method for hot-rolling process of wire rod |
| CN102974629A (en) * | 2012-12-24 | 2013-03-20 | 江苏西城三联控股集团有限公司 | Aerial fog cooling process method of hot rolling bar |
| CN102974629B (en) * | 2012-12-24 | 2015-01-14 | 江苏西城三联控股集团有限公司 | Aerial fog cooling process method of hot rolling bar |
| CN104550275A (en) * | 2014-12-26 | 2015-04-29 | 钢铁研究总院 | Method and device for spray evaporation cooling of hot-rolled high-strength rebar |
| CN104550275B (en) * | 2014-12-26 | 2016-07-06 | 钢铁研究总院 | A kind of spray vaporization chiller for hot-rolled high-strength reinforcing bar and method |
| CN108396127A (en) * | 2017-02-08 | 2018-08-14 | 鞍钢股份有限公司 | A method of lead bath wire rod is exempted from the production of aerating bubble in EDC sinks |
| CN110340155A (en) * | 2019-07-03 | 2019-10-18 | 首钢水城钢铁（集团）有限责任公司 | A kind of control production method for exempting from pickling SWRH82B gren rod iron scale |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1064567C (en) | 2001-04-18 |
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