CN1583305A - Controlled cooling method after H-shape steel rolling - Google Patents
Controlled cooling method after H-shape steel rolling Download PDFInfo
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- CN1583305A CN1583305A CN 200410020627 CN200410020627A CN1583305A CN 1583305 A CN1583305 A CN 1583305A CN 200410020627 CN200410020627 CN 200410020627 CN 200410020627 A CN200410020627 A CN 200410020627A CN 1583305 A CN1583305 A CN 1583305A
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Abstract
A controlled cooling method for the rolled H-shaped steel features that the just rolled H-shaped steel is cooled by the aerosolizing mode in a controllable cooler and its cooling speed is more than 50 deg.C/s.
Description
Affiliated technical field
The invention belongs to structure according to International Patent Classification (IPC) and use high-performance H shaped steel production control cooling technology field.
Technical background
H shaped steel is a kind of desirable economic section section bar, it than common I-steel have in light weight, performance good, specification is many, section economical rationality, easy to use and save advantage such as metal material, is widely used in skyscraper, machine-building, large-sized workshop, power plant construction, airport, port and pier, tunnel, underground railway, bridge, boats and ships, haulage vehicle, highway, tunnel support engineering, offshore oil platform, simple and easy garage, beach spend a holiday room and various engineering structure parts etc.
H shaped steel has that two leg inner surfaces termination parallel, two legs is rectangular, Metal Distribution rationally, good rigidly, not flexible, advantages such as mechanical property good, simple installation, so purposes is comparatively extensive.Generally in engineering, use H shaped steel, can save steel 15%～40%, and can save man-hour, shorten the construction period, raise the efficiency, reduce labour intensity, specious, generally adopt H shaped steel to replace common I-steel abroad.
H shaped steel is because the section structure complexity, rolling and subsequently on cold bed in the cooling procedure temperature distributing disproportionation of its each several part even, the binding site temperature of leg and waist is the highest, reduces gradually to the end of leg.Because the influence of roll cooling water and thermal convection current heat exchange, waist reduces gradually to central temperature; At the thickness direction of leg and waist, the temperature of upper surface and lower surface is more lower slightly.Therefore, uneven structural state usually appears in whole section in H rolling of sectional iron and cooling procedure, and finally makes the comprehensive mechanical property of H shaped steel and whole serviceability can not reach state specified standards, can't satisfy user's requirement.
Summary of the invention
Purpose of the present invention will address the above problem exactly.The present invention proposes H shaped steel and rolls the production process route that the control cooling is adopted in the back, promptly adopt the control cooling device that the different parts of H shaped steel is cooled off respectively in the outlet of H shaped steel universal mill, finally make H shaped steel have the favorable tissue state, thereby the mechanical property of H shaped steel is greatly improved, and every performance indications of product satisfy standard GB 11263-1998 " hot rolled H-shaped and subdivision T-steel " and concerned countries standard to H shaped steel tissue and performance demands comprehensively.
Principle of the present invention is by the aerosol cooling method fast and efficiently to H shaped steel after the hot rolling, suppressing austenite crystal grows up, and by phase transformation strengthening, refined crystalline strengthening and precipitation strength mechanism, make the austenite structure that is in higher temperature after rolling be transformed into martensite in the short time or/and bainite structure at the utmost point, then has precipitation strength simultaneously for steel alloy, when obtaining the small grains tissue, the comprehensive mechanical property of H shaped steel is improved, and every performance indications satisfy the national standard requirement comprehensively.
Realize that technical solution of the present invention is, set up a cover control cooling device in the outlet of H shaped steel universal mill, because the distance between general finisher and the cold bed is shorter, require the control cooling device to have stronger cooling capacity, therefore in cooling procedure, adopt the aerosol type of cooling, to increase cooling effectiveness.Simultaneously for making final H sectional shape uniformity of temperature profile, the cooling capacity difference of the different parts nozzle of H shaped steel, the cooling capacity of shank two side nozzles is bigger, and make the binding site cooling capacity of waist and leg the strongest, upper and lower both sides have nozzle perpendicular to H rolling of sectional iron direction waist to be cooled off respectively, but the group of nozzle is counted difference.The cooling capacity of control cooling device can be regulated by the water yield and hydraulic pressure.
The step that H shaped steel rolls back control cooling is:
1, blank heating.In heating furnace, blank heating to 1100～1200 ℃ are rolled.
2, on H shaped steel universal mill unit, carry out the reciprocal roll forming of multi-pass, rolling pass number that is adopted and pass are several to be determined according to milling train arrangement form, product specification etc.
3, rolled piece enters cooling device to cooling off simultaneously on different positions and the direction after going out finisher, and cooling water flow, cooling water pressure can be determined according to the specification of rolled products.
4, the H shaped steel that comes out from cooling device is sent to cold bed and cools off, because the temperature difference between its each position is less, and has reached lower temperature, therefore can guarantee that after cooling H shaped steel has than the uniform tissue state, the mechanical property of H shaped steel is significantly improved.
Through above-mentioned four H rollings of sectional iron and control cooling-production technology step, can make the mechanical performance index of H shaped steel satisfy standard GB 11263-1998 " hot rolled H-shaped and subdivision T-steel " fully to H shaped steel performance demands.
Biggest advantage of the present invention is: by the control cooling device after the hot rolling of H shaped steel, adopt aerosol control cooling technology, but the H shaped steel that will have higher temperature within a short period of time is cooled to lower temperature, utilize phase transformation strengthening, precipitation strength and refined crystalline strengthening mechanism, obtain having the H shaped steel structural state of small grains, thereby its comprehensive mechanical property is significantly improved.This technology can be finished by install aerosol control cooling device additional behind existing milling train; The product of producing satisfies request of national standard fully, greatly improves economic benefit of enterprises, strengthens Enterprises'Competitiveness.
The specific embodiment
Embodiment:
Behind the H of certain factory shaped steel universal mill, installed a cover control cooling device additional, the layout drawing of its cooling system as shown in Figure 1, this cooling device adopts aerosol type of cooling.The used blank specification of rolling H shaped steel is 300mm * 200mm rectangular bloom, and the finished size of H shaped steel is HM200 * 150.Blank is rolled 5 passages at two roller blooming mills earlier, then in rolling 3 passages of the universal roughing mill unit of UEU form, rolling a time on omnipotent finishing mill at last.
After the H rolling of sectional iron, enter the control cooling device and cool off, in the cooling device section arrangement form of nozzle as shown in Figure 2, two groups of nozzles are arranged along the vertical direction of H shaped steel axis up and down, and two side nozzles become 20 ℃ of angles approximately along H sectional shape horizontal axis.In the whole cooling device, top nozzle has 7, is divided into 3 groups and controls; Following nozzle is 10, is divided into 3 groups and controls; Each side of two side nozzles is 14, is divided into 5 groups and controls.
The Total Water of whole cooling device is 300m
3/ h, hydraulic pressure are 14MPa.
The tapping temperature of blank is 1150 ℃, through 11 passages rolling after, the outlet temperature of finished frame is 960 ℃, enter into subsequently control cooling system cool off.The speed of roller-way is 1.5m/s, and the length of cooler is 8m, and after the control cooling, the surface temperature of H shaped steel is 610 ℃, and cooldown rate is 65 ℃/s.
Be cooled to room temperature, the tissue and the performance of H shaped steel are tested, the performance indications of H shaped steel satisfy standard GB 11263-1998 " hot rolled H-shaped and subdivision T-steel " fully to H shaped steel performance demands as can be known.
Description of drawings
Fig. 1 is the layout of control cooling system on production line
Fig. 2 is the arrangement of aerosol cooling jet
In Fig. 1,1 is omnipotent finishing mill, and 2 are the control cooling device, and 3 is runout table, and 4 cut for scale, and 5 is cold bed.H shaped steel directly enters the control cooling device and cools off after rolling out omnipotent finishing mill, moves forward by runout table then, after reaching scale and cutting, cuts scale, cools off to cold bed at last, up to room temperature.
In Fig. 2,1 is top nozzle, and 2 are following nozzle, and 3 is the left side nozzle, and 4 is the right side nozzle, and 5 is all size H shaped steel.When H shaped steel enters into cooler, each nozzle cools off H shaped steel from different directions, and makes its temperature even as far as possible.
Claims (3)
1, to controlling cooling after the hot rolling of H shaped steel;
2, control cooling after adopting the aerosol type of cooling to the hot rolling of H shaped steel;
3, after the hot rolling of H shaped steel the cooldown rate of aerosol cooling reach 50 ℃/more than the s;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410020627 CN1583305A (en) | 2004-05-28 | 2004-05-28 | Controlled cooling method after H-shape steel rolling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410020627 CN1583305A (en) | 2004-05-28 | 2004-05-28 | Controlled cooling method after H-shape steel rolling |
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| CN1583305A true CN1583305A (en) | 2005-02-23 |
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| CN 200410020627 Pending CN1583305A (en) | 2004-05-28 | 2004-05-28 | Controlled cooling method after H-shape steel rolling |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101804422A (en) * | 2010-02-10 | 2010-08-18 | 东北大学 | Ultrafast cooling device for large rolled H-shaped steel |
| CN102363161A (en) * | 2011-10-21 | 2012-02-29 | 东北大学 | Ultrafast cooling control method for H-shaped steel |
| CN101767113B (en) * | 2009-12-22 | 2012-09-05 | 马鞍山钢铁股份有限公司 | Cooling control device after rolling of hot-rolled H-shaped steel |
| CN103071673A (en) * | 2013-02-01 | 2013-05-01 | 中冶赛迪工程技术股份有限公司 | Compact universal vertical steel rail rolling method |
| CN103357675A (en) * | 2013-06-28 | 2013-10-23 | 中冶南方工程技术有限公司 | Aerial fog cooling method and device for hot rolling H-shaped steel cooling bed |
-
2004
- 2004-05-28 CN CN 200410020627 patent/CN1583305A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767113B (en) * | 2009-12-22 | 2012-09-05 | 马鞍山钢铁股份有限公司 | Cooling control device after rolling of hot-rolled H-shaped steel |
| CN101804422A (en) * | 2010-02-10 | 2010-08-18 | 东北大学 | Ultrafast cooling device for large rolled H-shaped steel |
| CN101804422B (en) * | 2010-02-10 | 2011-10-26 | 东北大学 | Ultrafast cooling device for large rolled H-shaped steel |
| CN102363161A (en) * | 2011-10-21 | 2012-02-29 | 东北大学 | Ultrafast cooling control method for H-shaped steel |
| CN102363161B (en) * | 2011-10-21 | 2013-07-10 | 东北大学 | Ultrafast cooling control method for H-shaped steel |
| CN103071673A (en) * | 2013-02-01 | 2013-05-01 | 中冶赛迪工程技术股份有限公司 | Compact universal vertical steel rail rolling method |
| CN103071673B (en) * | 2013-02-01 | 2015-12-02 | 中冶赛迪工程技术股份有限公司 | Compact universal vertical steel rail milling method |
| CN103357675A (en) * | 2013-06-28 | 2013-10-23 | 中冶南方工程技术有限公司 | Aerial fog cooling method and device for hot rolling H-shaped steel cooling bed |
| CN103357675B (en) * | 2013-06-28 | 2016-06-29 | 中冶南方工程技术有限公司 | Hot rolled H-shaped cold bed aerosol cooling method and device thereof |
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