CN102240891A - Method for producing hot-rolling U-shaped steel sheet pile with residual stress less than 100 MPa - Google Patents
Method for producing hot-rolling U-shaped steel sheet pile with residual stress less than 100 MPa Download PDFInfo
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- CN102240891A CN102240891A CN2011101339584A CN201110133958A CN102240891A CN 102240891 A CN102240891 A CN 102240891A CN 2011101339584 A CN2011101339584 A CN 2011101339584A CN 201110133958 A CN201110133958 A CN 201110133958A CN 102240891 A CN102240891 A CN 102240891A
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Abstract
The invention relates to a method for producing a hot-rolling U-shaped steel sheet pile with a residual stress less than 100 MPa, which comprises the steps of: carrying out smelting, continuous casting and rolling; conveying to a cooling table for cooling, wherein the cooling speed is controlled within 0.5-8 DEG C/s and the cooling temperature, i.e., the temperature before straightening, is controlled at 100-300 DEG C; and straightening at a temperature of 100-300 DEG C. The method for producing the hot-rolling U-shaped steel sheet pile with the residual stress less than 100 MPa has the characteristics that: through controlling the residual temperature of the steel sheet pile before straightening and adopting a straightening process, the residual stress of the hot-rolling U-shaped steel sheet pile is effectively controlled, and the production cost is lowered, and the residual stress is less than 100 MPa, so that the effect of the hot-rolling U-shaped steel sheet pile used for piling is effectively enhanced; in addition, the method is simple to operate and is beneficial to popularization.
Description
Technical field
The present invention relates to the production method of hot rolling U-shaped steel sheet pile, specifically belong to and make the production method of residual stress less than the hot rolling U-shaped steel sheet pile of 100MPa.
Background technology
As everyone knows, the existence of residual stress has very big influence to the serviceability of steel especially fatigue behaviour in the steel, when it comprises cold working such as steel undergoes phase transition at inhomogeneous cooling, the steel tissue of hot rolling or its section of welding back, steel are received aligning, be subjected to the caused residual stress of external force effect; Because tissue changes the caused residual stress of microstress of caused residual stress and intergranule.Residual stress is crossed conference and is directly had influence on hot rolling U-shaped steel sheet pile piling effect, can make hot rolling U-shaped steel sheet pile fracture when piling when serious.
Hot rolling U-shaped steel sheet pile is through behind the air cooling, because each position Metal Distribution difference of its section, so cooling velocity is also different with contraction, moreover metal also can cause Volume Changes from austenite to perlitic transformation, all can cause the hot rolling U-shaped steel sheet pile bending.Because the metal of hot rolling U-shaped steel sheet pile web is bigger than two side wing edge metal proportions, under equal cooling condition, edge of a wing cooling velocity is very fast, and the web cooling velocity is slower.When the edge of a wing was cooled to no longer produce contraction distortion, the temperature of web was still higher, continued to produce contraction distortion in cooling procedure.Therefore, after web cools off fully, whole hot rolling U-shaped steel sheet pile will shrink to web, and it is serious crooked to cause whole hot rolling U-shaped steel sheet pile to take place, and this flexibility is rectifys antecurvature curvature.Crooked hot rolling U-shaped steel sheet pile can't be processed, and also can't use, so the finished product hot rolling U-shaped steel sheet pile must be delivered goods with straightened condition, reach straightened condition and just must align hot rolling U-shaped steel sheet pile.When the hot rolling U-shaped steel sheet pile flexibility was excessive, straightening deformation certainly will be excessive, and the result can produce bigger residual stress, even rectify disconnected.
In order to reduce the residual stress of aligning back steel, the producer of world production steel wants to have use up various ways, people such as Guo Jingdong (Guo Jingdong, Wang Jingpeng, Wang Baoquan. a kind of method .[number of patent application of eliminating residual stress in the steel]: 200710012665.3) handle by pulse current, discharge cycle 10～1000 μ s of pulse current, peak inrush current density 10
3～10
5A/cm
2, duration 500～800 μ s of individual pulse, thereby the residual stress in the minimizing steel.Anneal, add static load and mechanical vibration method in addition in addition to reach the purpose that reduces residual stress in the steel.
The residual stress of annealing, adding static load, mechanical oscillation and adopt burst process to reduce steel after rectifying is a kind of effective method, but this method is for manufacturer, equipment budget and production cost have been increased undoubtedly, the added value of hot rolling U-shaped steel sheet pile is had a greatly reduced quality, and has reduced the market competitiveness of hot rolling U-shaped steel sheet pile.
Summary of the invention
The technical problem to be solved in the present invention is: providing a kind of is neither increasing under the situation that equipment also do not heat-treat, by controlling the drafts of rectifying surplus temperature of front spring stake and horizontal roller, the hot rolling U-shaped steel sheet pile glacing flatness is satisfying under the situation of instructions for use, make hot rolling U-shaped steel sheet pile web and edge of a wing residual stress in 100Mpa, effectively guarantee the production method of hot rolling U-shaped steel sheet pile of the piling result of use of hot rolling U-shaped steel sheet pile.
Realize the technical measures of above-mentioned purpose:
Residual stress is less than the production method of the hot rolling U-shaped steel sheet pile of 100MPa, its step:
1) smelt, continuous casting, rolling, the temperature after the finish rolling is controlled at 800～1100 ℃;
2) deliver to cold bed after rolling and cool off, cooling velocity is controlled at 0.5～8 ℃/second, and temperature was controlled at 100～300 ℃ before chilling temperature was promptly aligned;
3) align under 100～300 ℃ of conditions, the biting speed of steel sheet pile is controlled at 0.1～0.5 meter per second, and the speed of steel sheet pile is controlled at 1～2 meter per second when normally aligning; Horizontal roller is at least 3 pairs, and overall reduction is controlled at 10～45 millimeters.
It is characterized in that: steel sheet pile is controlled at 2～6 ℃/second in the cooling velocity of cold bed, and temperature is controlled at 150～260 ℃ before the aligning.
It is characterized in that: the aligning overall reduction is controlled at 15～40 millimeters.
The present invention compared with prior art has following advantage:
1) the present invention makes the residual stress of hot rolling U-shaped steel sheet pile obtain effective control by controlling strong surplus temperature of front spring stake and straightening process, has reduced production cost, has increased the added value of hot rolling U-shaped steel sheet pile, has improved the market competitiveness of hot rolling U-shaped steel sheet pile.
2) the present invention make hot rolling U-shaped steel sheet pile residual stress in 100Mpa, effectively improved the piling result of use of hot rolling U-shaped steel sheet pile.
3) the present invention is simple to operate, is beneficial to popularization.
Description of drawings
Accompanying drawing is that hot rolling U-shaped steel sheet pile is measured residual stress place schematic diagram
Among the figure: C, L, R three places are the residual stress concentrations place.
The specific embodiment
Do further detailed description below:
Following table is technological parameter and the residual stress testing result statistical form of each embodiment.
The technological parameter of each embodiment and residual stress testing result
As can be seen from the table, through adopting the present invention, the residual stress of hot rolling U-shaped steel sheet pile is controlled in the 100MPa fully, thereby effectively improved the piling result of use of hot rolling U-shaped steel sheet pile, user's needs have also been satisfied fully, and technology is simple, need not increase equipment, for reducing production costs and improving the user market competitiveness and created condition.
Claims (3)
1. residual stress is less than the production method of the hot rolling U-shaped steel sheet pile of 100MPa, its step:
1) smelt, continuous casting, rolling, the temperature after the finish rolling is controlled at 800～1100 ℃;
2) deliver to cold bed after rolling and cool off, cooling velocity is controlled at 0.5～8 ℃/second, and temperature was controlled at 100～300 ℃ before chilling temperature was promptly aligned;
3) align under 100～300 ℃ of conditions, the biting speed of steel sheet pile is controlled at 0.1～0.5 meter per second, and the speed of steel sheet pile is controlled at 1～2 meter per second when normally aligning; Horizontal roller is at least 3 pairs, and overall reduction is controlled at 10～45 millimeters.
2. residual stress as claimed in claim 1 is characterized in that less than the production method of the hot rolling U-shaped steel sheet pile of 100MPa: steel sheet pile is controlled at 2～6 ℃/second in the cooling velocity of cold bed, and temperature is controlled at 150～260 ℃ before the aligning.
3. residual stress as claimed in claim 1 is characterized in that less than the production method of the hot rolling U-shaped steel sheet pile of 100MPa: the aligning overall reduction is controlled at 15～40 millimeters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101339584A CN102240891A (en) | 2011-05-23 | 2011-05-23 | Method for producing hot-rolling U-shaped steel sheet pile with residual stress less than 100 MPa |
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| CN2011101339584A CN102240891A (en) | 2011-05-23 | 2011-05-23 | Method for producing hot-rolling U-shaped steel sheet pile with residual stress less than 100 MPa |
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| CN2011101339584A Pending CN102240891A (en) | 2011-05-23 | 2011-05-23 | Method for producing hot-rolling U-shaped steel sheet pile with residual stress less than 100 MPa |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105127692A (en) * | 2015-10-08 | 2015-12-09 | 罗光政 | Production method of semi-closed U-shaped metal groove with inner skid resistance tooth hooks |
| CN105397433A (en) * | 2015-12-24 | 2016-03-16 | 哈尔滨锅炉厂有限责任公司 | Manufacturing method for U-shaped plate |
| CN107365944A (en) * | 2017-07-29 | 2017-11-21 | 华北理工大学 | Hot rolling U-shaped steel sheet pile and its manufacturing process |
| JP2019038035A (en) * | 2017-08-23 | 2019-03-14 | Ｊｆｅスチール株式会社 | Hat-shaped steel sheet pile, manufacturing method of hat-shaped steel sheet pile, and manufacturing facility therefor |
| CN110475623A (en) * | 2017-04-03 | 2019-11-19 | 日本制铁株式会社 | The manufacturing method and manufacturing equipment of steel sheet pile with flange |
| CN112718873A (en) * | 2020-12-14 | 2021-04-30 | 攀钢集团攀枝花钢钒有限公司 | Method for improving straightness of front end part of steel rail |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105127692A (en) * | 2015-10-08 | 2015-12-09 | 罗光政 | Production method of semi-closed U-shaped metal groove with inner skid resistance tooth hooks |
| CN105397433A (en) * | 2015-12-24 | 2016-03-16 | 哈尔滨锅炉厂有限责任公司 | Manufacturing method for U-shaped plate |
| CN110475623A (en) * | 2017-04-03 | 2019-11-19 | 日本制铁株式会社 | The manufacturing method and manufacturing equipment of steel sheet pile with flange |
| CN107365944A (en) * | 2017-07-29 | 2017-11-21 | 华北理工大学 | Hot rolling U-shaped steel sheet pile and its manufacturing process |
| JP2019038035A (en) * | 2017-08-23 | 2019-03-14 | Ｊｆｅスチール株式会社 | Hat-shaped steel sheet pile, manufacturing method of hat-shaped steel sheet pile, and manufacturing facility therefor |
| CN112718873A (en) * | 2020-12-14 | 2021-04-30 | 攀钢集团攀枝花钢钒有限公司 | Method for improving straightness of front end part of steel rail |
| CN112718873B (en) * | 2020-12-14 | 2022-07-12 | 攀钢集团攀枝花钢钒有限公司 | Method for improving straightness of front end part of steel rail |
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Application publication date: 20111116 |