CN104668297B - A kind of rebar surface oxide layer generates technique - Google Patents
A kind of rebar surface oxide layer generates technique Download PDFInfo
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- CN104668297B CN104668297B CN201510030960.7A CN201510030960A CN104668297B CN 104668297 B CN104668297 B CN 104668297B CN 201510030960 A CN201510030960 A CN 201510030960A CN 104668297 B CN104668297 B CN 104668297B
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Abstract
The invention discloses a kind of rebar surface oxide layer and generate technique, this technique includes carrying out continuous casting steel billet successively just pricking, essence is pricked, Water cooling and cold bed air cooling, before carrying out Water cooling and essence prick after under being passed through Oxygen Condition, steel surface is carried out oxidation processes.Use and increase oxygen-enriched air winding-up in the hot rolled ribbed bars operation of rolling, promote rebar surface oxidation, and in the operation of rolling, control cooling velocity and rolling temperature.The present invention, from these three aspect, generates fine and close Fe by controlling reinforcing bar oxidation under high temperature3O4Condition, it is thus achieved that thickness ratio is more consistent, and compactness is better, it is possible to play the oxide layer of protection steel substrate, and for complete fine and close continuously, whole process does not affect production.
Description
Technical field
The invention belongs to technical field of metallurgical production, generate technique particularly to a kind of rebar surface oxide layer.
Background technology
Steel bar corrosion is that reinforcing bar when processing without surface anticorrosion at hot humid environment or long-term outdoor storage
Existing inevitable phenomenon.The corrosion of reinforcing bar brings huge harm to the durability of xoncrete structure.
On the one hand, the steel bar mechanics performance after corrosion declines a lot, it is impossible to meet the needs of works bearing capacity,
On the other hand, after steel bar corrosion, reinforcing bar is substantially reduced with the cohesive force of concrete, and structure is in danger
State affects people life property safety.For the reinforcing bar of serious corrosion, user often proposes the return of goods
Requirement, estimates that the ferrous materials scrapped because of corrosion every year is about the 1/4～1/3 of metal annual production, therefore
Corrosion problem causes people to pay much attention to.
The corrosion that general reinforcing bar produces in placement process is the most all because rebar surface oxide layer
Protective effect lost efficacy and caused.Reinforcing bar in the operation of rolling and process air cooler later, surface meeting
One layer of thin oxide layer of self-assembling formation, this layer of oxide layer loose the finest and close, there is cavity, crackle and relatively thin
Etc. causing follow-up corrosion seriously, even to be peeled off, have a strong impact on sale and the use of reinforcing bar.Therefore at reinforcing bar
By controlling the generation of form compact and stable oxide layer in the operation of rolling, to steel during depositing, transport and using
The resistant tarnishing of muscle has great significance.
Summary of the invention
For defect of the prior art and deficiency, the present invention solves the oxygen of rebar surface in prior art
Change the problem that layer generating structure is uneven, the finest and close and thickness is undesirable, it is provided that a kind of reinforcing bar produced
Controlling the technique that oxide layer produces in journey, this technique is by controlled rolling process temperature, cooling velocity and increasing
Oxygen flow so that reinforcing bar just can generate one layer strong with matrix adhesive force in Rolling Production process, and thickness is equal
Even, form compact and stable oxide layer.
For reaching above-mentioned purpose, the present invention adopts the technical scheme that:
A kind of rebar surface oxide layer generates technique, this technique includes carrying out continuous casting steel billet successively just pricking,
Essence bundle, Water cooling and cold bed air cooling, it is characterised in that logical before carrying out Water cooling and after essence bundle
Enter, under Oxygen Condition, steel surface is carried out oxidation processes.
Further, described final rolling temperature is 1070～1080 DEG C；Described oxygen is oxygen-enriched air,
The amount of spraying of oxygen-enriched air is 25～30m3/ min, the oxygen content in oxygen-enriched air is 48%, during Water cooling
Between be 1.95～2.05s.
Further, the temperature of the described surface of reinforced bar before cold bed air cooling is 848～852 DEG C.
Concrete, described oxygen is sprayed and is carried out by air jet system, and air jet system includes external tube layer, interior
Tube layer and air inlet pipe, external tube layer and interior tube layer be connected composition airtight cavity by end, this airtight cavity with
Air inlet pipe connects, and has some passages on the sidewall of interior tube layer.
More specifically, described air inlet pipe includes the first air inlet pipe and the second air inlet pipe, the first air inlet pipe and
Symmetrical the connecting with airtight cavity of second air inlet pipe.
Further, a length of the 55 of described air jet system～65cm, a diameter of Ф 35～45cm of external tube layer,
A diameter of Ф 25～35cm of interior tube layer, the aperture of passage is the aperture of Ф 1.5～2.5cm, adjacent logical
Distance between pore is 1cm.
Compared with prior art, the invention has the beneficial effects as follows:
(1) oxide layer of the present invention generates technique, essence is pricked temperature, logical oxygen flow and carries out cool time
It is accurately controlled, not only by the THICKNESS CONTROL of the oxide layer of reinforcing bar about 20 μm, and for completely to connect
Continue and the Fe of densification3O4Layer；
(2) production process for convenience, the present invention gives the device carrying out logical oxygen, and this device can enter
The control of row oxygen-supply quantity, provides convenience for being accurately controlled generation technique.
Accompanying drawing explanation
Fig. 1 is oxygen supplier structural representation of the present invention；
Fig. 2 is the longitudinal sectional view of Fig. 1；
Fig. 3 is to wear the reinforcing bar oxide layer district electron-microscope scanning figure that water time 1.6s obtains in embodiment one；
Fig. 4 is to wear the reinforcing bar oxide layer district electron-microscope scanning figure that water time 1.8s obtains in embodiment one；
Fig. 5 is to wear the reinforcing bar oxide layer district electron-microscope scanning figure that water time 2.0s obtains in embodiment one；
Fig. 6 is to wear the reinforcing bar oxide layer district electron-microscope scanning figure that water time 2.2s obtains in embodiment one；
Fig. 7 is the reinforcing bar oxide layer district electron-microscope scanning figure in embodiment two；
Fig. 8 is the reinforcing bar oxide layer district's constituent analysis electron-microscope scanning figure in embodiment two；
Fig. 9 is the reinforcing bar oxide layer district electron-microscope scanning figure in embodiment three；
Fig. 1, label is expressed as in 2: tube layer, 201-passage, 3-the first air inlet in 1-external tube layer, 2-
Pipe, 4-the second air inlet pipe；
In Fig. 3-9, label is expressed as: d1-oxide layer gross thickness, d2-oxide layer outer layer thickness, A-aoxidize
Layer and air contact layer, B-oxide layer outer layer, C-oxide layer internal layer；
Below in conjunction with specification drawings and specific embodiments, the present invention is illustrated.
Detailed description of the invention
The rebar surface oxide layer of the present invention generates technique, at the beginning of this technique includes carrying out continuous casting steel billet successively
Bundle, essence bundle, Water cooling and cold bed air cooling, also carry out oxygen before carrying out Water cooling and spray, promote
The cooling of reinforcing bar also makes surface of reinforced bar Quick Oxidation, produces fine and close oxide layer.
Final rolling temperature is 1070～1080 DEG C；Described oxygen is oxygen-enriched air, the amount of spraying of oxygen-enriched air
It is 25～30m3/ min, the oxygen content in oxygen-enriched air is 48%, and the Water cooling time is 2s；By right
The control of conditions above not only by the THICKNESS CONTROL of the oxide layer of reinforcing bar about 20 μm, and for completely to connect
Continue and the Fe of densification3O4Layer.
Oxygen is sprayed and is carried out by air jet system, and air jet system includes external tube layer, interior tube layer and air inlet pipe,
External tube layer is connected composition airtight cavity with interior tube layer by end, and this airtight cavity connects with air inlet pipe, and
Having some passages on the sidewall of interior tube layer, gas is entered in airtight cavity again by ventilating by air inlet pipe
Hole sprays, so that oxygen-enriched air is jetted uniformly to the top layer of reinforcing bar.
Air inlet pipe includes the first air inlet pipe and the second air inlet pipe, the first air inlet pipe and the second air inlet pipe symmetry
Connecting with airtight cavity, ventilation the most quickly, contributes to uniformly spraying of oxygen；
The a length of 60cm of air jet system, a diameter of Ф 40cm of external tube layer, a diameter of Ф 30cm of interior tube layer,
The aperture of passage is the aperture of Ф 2cm, and the distance between adjacent vent holes is 1cm, the jet of accurate dimension
The oxygen amount of spraying can be controlled by device, in order to obtains needing the oxide layer of thickness.
Embodiment one:
The experiment production unit of this example is gantry, Shaanxi steel plant, the technique that its hot rolled ribbed bars produces
Flow process is: blast furnace process molten iron → converter smelting molten steel → Bottom Argon Stirring → continuous casting → 150mm × 150mm
Square billet → heating furnace heating → breaking down → roughing → in roll → rear the Water cooling of finish rolling → roll → upper cold bed air cooling
→ packing → metering warehouse-in；
Breaking down temperature is 1050 DEG C, and after 6 passage roughing, temperature have dropped 40～50 DEG C, becomes 1000 DEG C
Left and right, then roll in 6 passages, temperature is recovered to breaking down temperature, eventually passes 4 passage finish rolling, temperature
Degree rises to 1080 DEG C；
Through Water cooling after rolling, surface of reinforced bar temperature reduces rapidly, due to reinforcing bar internal temperature also at 1000 DEG C
Above, after reinforcing bar goes out to wear water tank, internal heat is diffused into top layer, and skin temperature raises again.
To wear the water time in experiment positions 1.6s, 1.8s, 2s and 2.2s respectively, wears after water in reinforcing bar
During portion's tempering upper cold bed, temperature is respectively 920 DEG C, 876 DEG C, 848 DEG C and 815 DEG C, when four kinds of differences wear water
Between the reinforcing bar oxide layer district electron-microscope scanning figure that obtains the most as shown in Figures 3 to 6.
Reinforcing bar oxidated layer thickness under the table 1 different Water cooling time
Wear water time oxide layer gross thickness d1 when 1.6s and 1.8s the least, wear water time oxygen when 2s
Change layer gross thickness d1 is close to 17 μm, and oxide layer outer layer thickness d2 is less, and wears the water time at 2.2s
Time oxide layer gross thickness d1 relatively big, the oxide layer that thickness is big is easily peeled, and is unfavorable for the oxidation to steel.
Embodiment two:
In conjunction with Fig. 1 and Fig. 2, the air jet system of the present embodiment is the tubular part of hollow, outside this device includes
Tube layer 1, interior tube layer the 2, first air inlet pipe 3 and the second air inlet pipe 4, external tube layer 1 and interior tube layer 2 are at end
Portion carries out sealing combination composition cavity, and this cavity connects with the first air inlet pipe 3 and the second air inlet pipe 4 respectively,
Passage 201 it is provided with uniformly on the sidewall of interior tube layer 2；
Rich foster air is passed through external tube layer 1 by the first air inlet pipe 3 and the second air inlet pipe 4 and forms with interior tube layer 2
Cavity in, rich air of supporting leads to outside by the passage 201 in interior tube layer 2；
The a length of 60cm of the present embodiment air jet system, a diameter of Ф 40cm of external tube layer 1, interior tube layer 2
A diameter of Ф 30cm, passage 201 is the aperture of Ф 2cm, and adjacent vent holes spacing is 1cm.
Embodiment three:
On the premise of not changing other production technologies of example 1, before Water cooling, increase oxygen-enriched air
Winding-up, carries out spraying of rich foster air, oxygen content in oxygen-enriched air by the air jet system of embodiment two
Being 48%, remaining is air, and flow-control of jetting is at 30m3/ min, will wear the water time is set to 2s, wears
It is 848 DEG C that water cooling terminates rear rebar surface temperature.
The reinforcing bar oxide layer district electron-microscope scanning figure that obtains is as it is shown in fig. 7, reinforcing bar oxide layer gross thickness d1 in figure
Being 19.9 μm, oxide layer outer layer thickness d2 is 7.72 μm, reinforcing bar oxide layer gross thickness d1 and oxide layer
Outer layer thickness d2 is big compared with the oxidated layer thickness in embodiment one.
The oxide layer of the present embodiment is carried out constituent analysis, and analysis result is shown in Fig. 8 and Biao 2
Wherein A is oxide layer and air contact layer, and B is oxide layer outer layer, and C is oxide layer internal layer, O/Fe
For deduction FeCO3The required ratio after Fe and O.
Table 2 spot scan sample atomic weight composition
By the constituent analysis in the thickness of oxide layer and each layer, the oxygen that the technique of the present embodiment produces
The thickness changing layer is relatively mild, and composition meets requirement, is beneficial to the anti-oxidation protection to reinforcing bar.
Embodiment four:
Flow of just jetting on the basis of example three changes 50m into3/ min, the now electron-microscope scanning of oxide layer
See Fig. 9.
From data in figure, oxide layer gross thickness d1 is that 29.6 μm, oxide layer outer layer thickness d2 are
8.25 μm, the oxide layer of such thickness not only can not play the purpose preventing reinforcing bar from aoxidizing, and thickness is too big,
It is easily peeled during the use of reinforcing bar, it is impossible to meet actually used requirement.
Claims (5)
1. rebar surface oxide layer generates a technique, at the beginning of this technique includes carrying out continuous casting steel billet successively
Roll, finish rolling, Water cooling and cold bed air cooling, it is characterised in that before carrying out Water cooling and finish rolling
After under being passed through Oxygen Condition, steel surface is carried out oxidation processes；
Described final rolling temperature is 1070～1080 DEG C；Described oxygen is oxygen-enriched air, oxygen-enriched air
The amount of spraying be 25～30m3/ min, the oxygen content in oxygen-enriched air is 48%, and the Water cooling time is
1.95～2.05s.
2. rebar surface oxide layer as claimed in claim 1 generates technique, it is characterised in that described
Cold bed air cooling before the temperature of surface of reinforced bar be 848～852 DEG C.
3. rebar surface oxide layer as claimed in claim 1 or 2 generates technique, it is characterised in that
Described oxygen is sprayed and is carried out by air jet system, and air jet system includes external tube layer, interior tube layer and air inlet
Pipe, external tube layer is connected composition airtight cavity with interior tube layer by end, and this airtight cavity is with air inlet pipe even
Logical, and on the sidewall of interior tube layer, have some passages.
4. rebar surface oxide layer as claimed in claim 3 generates technique, it is characterised in that described
Air inlet pipe include the first air inlet pipe and the second air inlet pipe, the first air inlet pipe and the second air inlet pipe are symmetrical
Connect with airtight cavity.
5. rebar surface oxide layer as claimed in claim 4 generates technique, it is characterised in that described
Air jet system a length of 55～65cm, a diameter of Ф 35～45cm of external tube layer, interior tube layer straight
Footpath is Ф 25～35cm, and the aperture of passage is the aperture of Ф 1.5～2.5cm, between adjacent vent holes
Distance is 1cm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106111698A (en) * | 2016-07-16 | 2016-11-16 | 首钢总公司 | A kind of controlled rolling and controlled cooling reinforcing bar hinders the production method of rust online |
| CN109500103A (en) * | 2018-12-07 | 2019-03-22 | 中冶建筑研究总院有限公司 | Bar cooling controlling and rolling controlling process air blast, jet intercept water oxidation unit and method |
| CN112246888B (en) * | 2020-09-08 | 2024-01-30 | 福建泉州闽光钢铁有限责任公司 | Production method for improving surface quality of finish-rolled deformed bar |
| CN113026012B (en) * | 2021-02-24 | 2023-03-21 | 广西柳钢华创科技研发有限公司 | Method for improving anti-rusting capability of bar end by using spray |
| CN115725898B (en) * | 2021-05-28 | 2023-10-10 | 广西柳钢华创科技研发有限公司 | High-speed bar screw thread steel with low cost and surface oxide scale thickness of more than 10 mu m |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6612898B1 (en) * | 1996-06-20 | 2003-09-02 | Tadahiro Ohmi | Method for forming oxidation-passive layer, fluid-contacting part, and fluid feed/discharge system |
| CN102337389A (en) * | 2010-07-27 | 2012-02-01 | 辽宁科技大学 | Rust-removal corrosion-resisting thermal treatment method of rod and wire steel surface and rectangular burner used by same |
| CN102392210A (en) * | 2011-10-27 | 2012-03-28 | 莱芜钢铁集团有限公司 | On-line rust-proof method for twisted steel |
| CN103695837A (en) * | 2013-11-29 | 2014-04-02 | 莱芜钢铁集团有限公司 | Construction reinforcement surface rust prevention method |
-
2015
- 2015-01-21 CN CN201510030960.7A patent/CN104668297B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6612898B1 (en) * | 1996-06-20 | 2003-09-02 | Tadahiro Ohmi | Method for forming oxidation-passive layer, fluid-contacting part, and fluid feed/discharge system |
| CN102337389A (en) * | 2010-07-27 | 2012-02-01 | 辽宁科技大学 | Rust-removal corrosion-resisting thermal treatment method of rod and wire steel surface and rectangular burner used by same |
| CN102392210A (en) * | 2011-10-27 | 2012-03-28 | 莱芜钢铁集团有限公司 | On-line rust-proof method for twisted steel |
| CN103695837A (en) * | 2013-11-29 | 2014-04-02 | 莱芜钢铁集团有限公司 | Construction reinforcement surface rust prevention method |
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