CN110170523A - A kind of low energy consumption controlled rolling method of hot rolled ribbed bars - Google Patents
A kind of low energy consumption controlled rolling method of hot rolled ribbed bars Download PDFInfo
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- CN110170523A CN110170523A CN201910420039.1A CN201910420039A CN110170523A CN 110170523 A CN110170523 A CN 110170523A CN 201910420039 A CN201910420039 A CN 201910420039A CN 110170523 A CN110170523 A CN 110170523A
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- rolling
- energy consumption
- cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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Abstract
The present invention provides a kind of low energy consumption controlled rolling methods of hot rolled ribbed bars, belong to Materials Processing Engineering technical field.By moving back 15-30m to last 2 frame of mm finishing mill unit on bar continuous rolling production line, between 1 section of finish rolling and 2 sections of finish rolling, cooling is forced to the rolled piece after single line or cutting namely between inverse 2-3 rolling mill, joint intermediate mill aftercooler carries out sub-sectional cooling to rolled piece, controlled rolling is realized in last 2 racks of rolling line, it carries out cooling and temperature to circular cross section rolled piece to reply, in conjunction with the cooling between rolling line front group, reaching reduces Ribbed Bar controlled rolling energy consumption purpose.This method only has last two passage using zerolling, can obviously reduce energy consumption, can also obtain thinner ferrite and pearlite tissue Ribbed Bar, and reducing or cancelling the addition of V, Nb, Ti alloy reduces cost of alloy.
Description
Technical field
The invention belongs to Materials Processing Engineering technical field, the low energy consumption control for relating generally to a kind of hot rolled ribbed bars is rolled
Method processed.
Background technique
Hot rolled ribbed bars are one of most important raw material of building trade concrete structure.China is hot-rolled reinforced bar maximum
Producing country.Currently, 400MPa grades of yield strength or more hot rolled ribbed bars accounting is up to 96%, especially yield strength
600MPa grades of reinforcing bars have also been applied.In order to realize the policy of energy-saving and emission-reduction, green building, construction(al)steel amount is reduced, is mentioned
High building safety, using intensity, bigger, the higher reinforcing bar of antidetonation rank will become mainstream.Therefore, hot rolled ribbed bars produce
The consumption of process has important influence to the resource-effective and national economic development.
Q235 class straight carbon steel can produce 400MPa grades, 500MPa grades reinforcing bars of yield strength using Heat Treatment, and not
Need to be added the microalloy elements such as vanadium, niobium, titanium, although having saved alloy resource, intensity drops after waste heat treatment steel bar welding
Low, shock resistance is bad, and rebar surface forms hard phase constitution, reduces the fatigue behaviour of component.For HRB400~HRB600 rank
The security application of hot rolled ribbed bars controls Heat Treatment phenomenon caused by cooling, avoids welding after preventing excessive hot-rolled reinforced bar from rolling
Decline of the heat affected area compared with rebar matrix intensity is connect, standard GB/T 1499.2-2018 is to hot-rolled reinforced bar metallographic and section hardness
The pertinent regulations that difference is examined, prevent reinforcing bar basic circle surface hardening-tempering layer.
Some researchers have produced 400MPa grades of yield strength using Q235 class straight carbon steel using fine production technology
Ultra-fine Grained reinforcing bar, do not need that microalloy element is added, significantly reduce alloy content, but Ultra-fine Grained reinforcing bar is needed in 780-
The zerolling that deflection is greater than 50% is carried out at 850 DEG C, high to equipment requirement, existing equipment is difficult to realize, and technology changes
It makes and needs a large amount of expenses.Also there is researcher to roll using approximate conventional technique, final rolling temperature at 900-950 DEG C or more,
Energy consumption is not only increased, and is easy to appear self tempering tissue during rapid cooling after rolling, produces waste heat treatment steel bar.Rolling
Process is cooling to the classification of rolled piece and realizes that controlled rolling is to solve low cost, the high efficiency solution of tissue and performance.
Researcher studies through a large number of experiments, existing to ask although proposing many Ribbed Bar rolling controlling methods
Topic still protrudes.
Patent application " post rolling fast cooling-production technology of high strength ribbed reinforced bar " (200510046823.9) proposes
Post rolling fast cooling-production technology of high strength ribbed reinforced bar, with greater than 700 DEG C/sec of cooling rate in 1 second by reinforcing bar from
1020-1150 DEG C of end is cooled to 480-720 DEG C.Its problem is that ultra-rapid cooling can make rolled piece surface texture abnormal, and eventually
It is excessively high to roll temperature, increases energy consumption, increased costs.
Patent application " the cooling milling method of bar high temperature finish rolling for building-control " (200410020521.X) proposes
A kind of cooling milling method of bar high temperature finish rolling for building-control, finishing mill outlet temperature are controlled at 900 DEG C or more, not into
Row zerolling and immediate quenching.Its problem is that the roll consumption in finish rolling area is serious, and energy consumption increases, and is unfavorable for save the cost.
More segmentation techniques have obtained extensive promotion and application because it can significantly promote steel rolling yield, from initial two
There is application in steel mill of the segmentation technique to six current segmentation techniques in the whole nation.WithFor hot rolled ribbed bars, three are cut
The mitogenetic production daily output then can reach 4000t up to 3000t, five cuttings in 2000t or so, four cuttings.More segmentation techniques make steel
Muscle yield is not limited by rolling specs, and professional hot rolled ribbed bars production line annual output is up to ten thousand tons of 120-150.But
The shortcomings that current more cutting control technologies, is also very prominent, for example rebar sizes precision is difficult to control, and finish rolling stage energy consumption is high, rolls
Power is larger, roll wear is serious, especially Low Temperature Finish when splitting rolling accident occur frequently.
Summary of the invention
Present invention aim to solve the above problems.The invention proposes a kind of new multi-segmentation hot-rolled strip rib steels
The low energy consumption controlled rolling method of muscle is segmented rolled piece that is, by the reasonable Arrangement to milling train on production line and cooler
It is cooling, to realize the controlled rolling of low energy consumption, and guarantee that the uncontrolled rolling of splitting rolling influences, realizes that production cost reduces
It is promoted with economic benefit.
A kind of low energy consumption controlled rolling method of hot rolled ribbed bars, it is characterised in that by bar continuous rolling production line
Last 2 frame of mm finishing mill unit moves back 15-30m, right between 1 section of finish rolling and 2 sections of finish rolling, that is, between inverse 2-3 rolling mill
Rolled piece after single line or cutting forces cooling, and joint intermediate mill aftercooler carries out sub-sectional cooling to rolled piece, in rolling line last 2
A rack realizes controlled rolling, so that reaching reduces Ribbed Bar controlled rolling energy consumption purpose.
Further, it is described pressure be cooled to rolling temperature control range after, 2 sections of finish rolling to rolled piece at 900~800 DEG C
Implement two passage rolling deformations.
Further, to multi wire cutting rolling, the circular cross section rolled piece pressure after cutting is cooled to rolling temperature control model
After enclosing, then carry out controlled rolling.
Further, the pressure is cooled to water cooling, water pressure 0.6-2.0MPa.
Further, after twice time controlled rolling deformation, rolled piece can continue to cool down, and inhibit austenite growing up after rolling, not
Form over-cooling structure martensite and bainite.
Than between traditional middle mm finishing mill unit, cooling controlled rolling is compared, the invention has the advantages that
1) low-temperature deformation only has two passages, and energy consumption substantially reduces, and can also reduce roll consumption；
2) rolled piece circular cross-section after cutting, cross dimensions is small, so that rolled piece can be cooled down uniformly when guaranteeing to control cold；
3) rolled piece cross dimensions is small after cutting, and temperature drop is fast when forcing cooling, returns temperature also than very fast, substantially reduces when returning temperature
Between, reduce length that is cooling and returning warm area；
4) the rolled piece after rolled piece cutting force it is cooling return temperature after, using the controlled rolling of the large deformation of 2 passages,
Meet the accumulated deformation requirement of Ribbed Bar controlled rolling.
5) it is easier to realize classification cooling in the entire operation of rolling, avoids excessively cooling being forced to lead to rolled piece surface texture
It is abnormal.
Detailed description of the invention
Fig. 1 continual rolling production line of bar arrangement
1- heating furnace；2- roughing mills；3- intermediate mill；Cooler between finish rolling in 4-；1 section of 5- finish rolling；6- finish rolling 1 is had no progeny
Cooler；2 sections of 7- finish rolling；8- finish rolling aftercooler；9- cold bed.
Cooling position view is forced after Fig. 2 rolled piece multi-segmentation
(a) two cutting；(b) three cutting；(c) four cutting；(d) five cutting.
Specific embodiment
In order to further appreciate that summary of the invention of the invention, now in conjunction with attached drawing, detailed description are as follows:
The low energy consumption controlled rolling step of multi-segmentation hot rolled ribbed bars of the invention are as follows:
Mainly for year annual output at 1,000,000 tons or more, product specification is multi-segmentation(
One-strand roller is mainly used, rolling temperature is at 800-850 DEG C).
1, steel billet chemical component is 0.22%C, 0.45%Si, 1.35%Mn ,≤0.025% P and S, remaining for iron and
Inevitable chemical element.
2, blank is heated to 1000-1100 DEG C in heating furnace first.
3, after coming out of the stove, roll forming is carried out on the hot rolled ribbed bars continual rolling production line that process layout is 6-6-4-2,
According to rolling mill layout and product specification selection rolling pass and pass parameters.
1) wherein, rolled piece is after roughing rolls 12 rolling mills in, and Forced water cooling is primary, then using 16 frame of finish rolling
Forced water cooling is primary again after milling train, cooling water pressure 0.8-1.5MPa, twice the cooling cooling that can be achieved at the same time more by a small margin, both
Splitting rolling accident can be reduced, and can realize Low Temperature Finish (Low Temperature Finish temperature cannot be below 900 DEG C), obtains thinner Ovshinsky
Body crystal grain.
2) low temperature large deformation of the rolled piece Jing Guo last two passage, energy consumption substantially reduce.Above-mentioned two passages low-temperature deformation control
The accumulation elongation percentage of two passages deformation is greater than 1.5.
3) can continue to cool down after two passage low-temperature deformations, cooling water pressure is 1.0~2.0MPa, and cooling procedure is with hot-rolled strip
It is principle that the basic circle of rib reinforcement, which does not occur bainite and martensite,.
4, upper cold bed after roller repairing, temperature gradually decreases until room temperature state, can get thinner ferrite and pearly-lustre
Body tissue.
Using multi-segmentation low energy consumption controlled rolling method of the invention, the blank of mentioned component is rolled into production surrender
The hot rolled ribbed bars of intensity 400MPa, the basic circle surface of reinforcing bar, can without closing water cooling tissue (quenched martensite or bainite)
With the refined crystalline strengthening effect generated by the technology controlling and process, without adding V, Nb, Ti alloy.
Claims (5)
1. a kind of low energy consumption controlled rolling method of hot rolled ribbed bars, it is characterised in that by smart on bar continuous rolling production line
Last 2 frame of milling train group moves back 15-30m, between 1 section of finish rolling and 2 sections of finish rolling, that is, to list between inverse 2-3 rolling mill
Rolled piece after line or cutting forces cooling, and joint intermediate mill aftercooler carries out sub-sectional cooling to rolled piece, and last 2 in rolling line
Rack realizes controlled rolling, so that reaching reduces Ribbed Bar controlled rolling energy consumption purpose.
2. the low energy consumption controlled rolling method of hot rolled ribbed bars according to claim 1, it is characterised in that: force cooling
To rolling temperature control range, 2 sections of finish rolling to rolled piece in 900~800 DEG C of two passage rolling deformations of implementation.
3. the low energy consumption controlled rolling method of hot rolled ribbed bars according to claim 1, it is characterised in that: to multi-wire cutting
Divide rolling, after the circular cross section rolled piece pressure after cutting is cooled to rolling temperature control range, then carries out controlled rolling.
4. the low energy consumption controlled rolling method of hot rolled ribbed bars according to claim 1, it is characterised in that: the pressure
It is cooled to water cooling, water pressure 0.6-2.0MPa.
5. according to right want 2 described in hot rolled ribbed bars low energy consumption controlled rolling method, it is characterised in that: twice time controlled rolling
After deformation, rolled piece continues to cool down.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910420039.1A CN110170523A (en) | 2019-05-20 | 2019-05-20 | A kind of low energy consumption controlled rolling method of hot rolled ribbed bars |
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| CN201910420039.1A CN110170523A (en) | 2019-05-20 | 2019-05-20 | A kind of low energy consumption controlled rolling method of hot rolled ribbed bars |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110947759A (en) * | 2019-12-20 | 2020-04-03 | 中冶南方工程技术有限公司 | Deformed steel bar rolling production line and production method thereof |
| CN113319121A (en) * | 2021-06-09 | 2021-08-31 | 武钢集团襄阳重型装备材料有限公司 | Production method of anti-seismic deformed steel bar HRB400E |
| CN113814281A (en) * | 2021-09-03 | 2021-12-21 | 广西钢铁集团有限公司 | Cost-reducing segmented cooling control method for hot-rolled ribbed steel bar |
| CN114951307A (en) * | 2022-05-20 | 2022-08-30 | 广西钢铁集团有限公司 | Hot-rolled ribbed steel bar direct-rolling sectional control cooling method |
| CN115672987A (en) * | 2022-09-19 | 2023-02-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous rolling blank cogging rolling method for titanium and titanium alloy round ingot casting rod and wire |
| CN116103576A (en) * | 2023-02-21 | 2023-05-12 | 北京科技大学 | Hot rolled ribbed straight bar with yield strength of 500MPa and manufacturing method thereof |
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| CN104307890A (en) * | 2014-11-13 | 2015-01-28 | 攀枝花钢城集团有限公司 | Combined controlled rolling and cooling production technology of HRB400 hot rolled ribbed steel bars |
| CN106077085A (en) * | 2016-07-29 | 2016-11-09 | 中冶赛迪工程技术股份有限公司 | The production system of a kind of low yield strength ratio hot-rolled high-strength anti-seismic steel bar and method |
| CN205851555U (en) * | 2016-07-29 | 2017-01-04 | 中冶赛迪工程技术股份有限公司 | A kind of production system of low yield strength ratio hot-rolled high-strength anti-seismic steel bar |
| CN106734192A (en) * | 2017-01-13 | 2017-05-31 | 中冶华天工程技术有限公司 | High intensity small dimension hot-rolled reinforced bar production equipment and its production technology |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110947759A (en) * | 2019-12-20 | 2020-04-03 | 中冶南方工程技术有限公司 | Deformed steel bar rolling production line and production method thereof |
| CN113319121A (en) * | 2021-06-09 | 2021-08-31 | 武钢集团襄阳重型装备材料有限公司 | Production method of anti-seismic deformed steel bar HRB400E |
| CN113319121B (en) * | 2021-06-09 | 2022-05-20 | 武钢集团襄阳重型装备材料有限公司 | Production method of anti-seismic deformed steel bar HRB400E |
| CN113814281A (en) * | 2021-09-03 | 2021-12-21 | 广西钢铁集团有限公司 | Cost-reducing segmented cooling control method for hot-rolled ribbed steel bar |
| CN113814281B (en) * | 2021-09-03 | 2024-02-06 | 广西钢铁集团有限公司 | Cost-reducing sectional cooling control method for hot rolled ribbed steel bar |
| CN114951307A (en) * | 2022-05-20 | 2022-08-30 | 广西钢铁集团有限公司 | Hot-rolled ribbed steel bar direct-rolling sectional control cooling method |
| CN114951307B (en) * | 2022-05-20 | 2024-05-28 | 广西钢铁集团有限公司 | Direct rolling sectional control cooling method for hot rolled ribbed steel bar |
| CN115672987A (en) * | 2022-09-19 | 2023-02-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous rolling blank cogging rolling method for titanium and titanium alloy round ingot casting rod and wire |
| CN116103576A (en) * | 2023-02-21 | 2023-05-12 | 北京科技大学 | Hot rolled ribbed straight bar with yield strength of 500MPa and manufacturing method thereof |
| CN116103576B (en) * | 2023-02-21 | 2024-05-24 | 北京科技大学 | Hot rolled ribbed straight bar with yield strength of 500MPa and manufacturing method thereof |
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Application publication date: 20190827 |