CN114309061A - Technology for controlling oxide scale structure of fine-grain hot-rolled steel bar on line - Google Patents
Technology for controlling oxide scale structure of fine-grain hot-rolled steel bar on line Download PDFInfo
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- CN114309061A CN114309061A CN202111403327.XA CN202111403327A CN114309061A CN 114309061 A CN114309061 A CN 114309061A CN 202111403327 A CN202111403327 A CN 202111403327A CN 114309061 A CN114309061 A CN 114309061A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- 238000005516 engineering process Methods 0.000 title claims abstract description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052786 argon Inorganic materials 0.000 claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000010079 rubber tapping Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000005096 rolling process Methods 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 239000003570 air Substances 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 239000002918 waste heat Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 abstract description 8
- 239000011159 matrix material Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 6
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000010410 layer Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000754 Wrought iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a technology for controlling an iron scale structure on line by a fine-grain hot-rolled steel bar, which comprises the following equipment: the process comprises the following process flows of heating the steel billet by the heating furnace for 80-100 min, and the tapping temperature is 1000-1050 ℃. The invention innovatively transforms two groups of high-pressure air-rich boxes and high-pressure argon-rich boxes on the basis of unchanged original production technology of the fine-grain hot-rolled steel bar to improve the surface scale structure of the fine-grain steel bar. The thickness of the scale on the surface of the produced fine-grained steel bar is controlled to be 20-35 mu m, and the scale is made of FeO and 40-60% Fe3O4The iron oxide is compact and has good bonding degree with a matrix and is not easy to fall off.
Description
Technical Field
The invention belongs to the technical field of steel bar iron scale structure control, and particularly relates to a technology for controlling an iron scale structure on line by a fine-grain hot-rolled steel bar.
Background
After the new national standard of GB/T1499.2-2018 hot-rolled steel bars is implemented, the micro-alloy strengthening technology is basically adopted by various domestic steel mills, the product strength is improved by utilizing the alloy strengthening mode, the product quality produced by the method can meet the new national standard requirement, but the cost is higher, the change is easy to happen due to the change of the alloy price, enterprises become very passive, and the enterprises face very severe survival pressure.
In order to solve the problem, each large steel mill starts to carry out technical research and development in a steel rolling process, improves the comprehensive performance of the steel bar and reduces the alloy consumption by utilizing refined crystal grains through adjusting a steel rolling process, mainly adopts a rolling process controlled rolling temperature control technology, and tests show that when the temperature of an upper cooling bed of the steel bar produced by the technology reaches below 850 ℃, the surface oxide scale of the steel bar is less and thin, the color of the steel bar is gray black, even red rust is generated, the surface quality is poor, and the steel bar starts to be corroded in a large area after being placed for a few days, so that the use and the building safety are seriously influenced. The quality and the rust-proof capability of hot-rolled steel bar products are the key factors influencing the building safety, and the cost can be reduced by the steel enterprises without considering the safety.
Disclosure of Invention
The invention relates to a technology for controlling a scale structure of a fine-grain hot-rolled steel bar on line, which mainly solves the problems of poor surface quality of the steel bar, less scale, poor corrosion resistance and the like caused by a rolling control temperature control technology. The invention adopts the steps of respectively adding the high-pressure air-rich box and the high-pressure argon-rich box before and after finish rolling water cooling, controlling the structure of the iron scale on the surface of the steel bar through online treatment, improving the content and the thickness of Fe3O4, and improving the compactness of the iron scale and the bonding degree with a matrix, thereby improving the corrosion resistance and the surface quality of the fine-grain hot-rolled steel bar.
5. In order to achieve the purpose, the invention provides the following technical scheme: the technology for controlling the structure of the iron scale on line by the fine-grain hot-rolled steel bar comprises the following equipment: the process comprises the following steps of heating furnace, 6 frames of rough rolling unit, 6 frames of intermediate rolling unit, 6 frames of finishing rolling unit, high-pressure air-rich box, 4 groups of temperature-controlled water tanks, high-pressure argon-rich box and cooling bed, and comprises the following process flows:
the method comprises the following steps: heating the steel billet by a heating furnace for 80-100 min, wherein the tapping temperature is 1000-1050 ℃;
step two: carrying out rough rolling by utilizing 6 continuous rough rolling mill groups;
step three: carrying out medium rolling by utilizing continuous 6 groups of medium rolling mill units;
step four: 1 group of temperature control water tanks are used for controlling the temperature of the rolled piece to be 900-1000 ℃ and then the rolled piece enters a finishing mill group;
step five: carrying out finish rolling by utilizing 6 continuous groups of finishing mill groups, and controlling the temperature of a rolled piece at a finish rolling outlet to be 950-1050 ℃;
step six: blowing by using a high-pressure rich air box, wherein a plurality of groups of annular nozzles with the spacing of 0.8m are arranged in the box, the pressure of compressed air is controlled to be 0.6-1.2 MPa, and the air and waste heat and waste gas in a plant are subjected to heat exchange to 900-1000 ℃ and then are blown into a box body at high pressure;
step seven: the steel bars sprayed by the high-pressure air-rich box immediately enter the temperature control water tanks for cooling treatment, the three groups of temperature control water tanks adopt a graded temperature control technology of quick cooling-temperature return-quick cooling-temperature return, and the maximum temperature difference between the inside and the outside of the steel bars is controlled not to exceed 350 ℃ and the instantaneous surface temperature is not lower than 500 ℃ during cooling so that the steel bars are integrally cooled;
step eight: blowing by using a high-pressure argon-rich gas box, adding a group of high-pressure argon-rich gas boxes which are the same as the steps in the sixth step after the rolled piece is cooled by water, wherein the pressure is 0.6-1.2 MPa, and the contact between the steel bar and oxygen is isolated;
step nine: putting the steel bar on a cooling bed, and controlling the temperature of the steel bar on the cooling bed to be 730-780 ℃;
step ten: and (6) collecting and packaging.
Furthermore, the high-pressure air-rich boxes and the temperature control water tanks are compactly arranged, and the temperature control water tanks and the high-pressure argon-rich boxes are arranged at intervals of 10 m.
And further, in the seventh step, the three groups of temperature control water tanks adopt high-pressure vertical water spraying cooling and high-pressure air water interception of an outlet reverse nozzle.
Further, the structure of the high-pressure air-enriched box and the high-pressure argon-enriched box comprises a passageway box body, a support bracket, an annular nozzle, an air duct, a transverse connecting pipe, an air inlet pipe and a rolled piece, wherein the support bracket is installed at the inner bottom of the passageway box body, the top bearing of the support bracket is provided with the rolled piece, the annular nozzle is uniformly sleeved on the outer side of the rolled piece, the annular nozzle is communicated with the air duct, one side of the passageway box body is provided with a transverse connecting pipe, one end of the air duct is extended to the outside of the passageway box body and is communicated with the transverse connecting pipe, and the transverse connecting pipe is communicated with the air inlet pipe.
The technical scheme of the invention has the following beneficial effects:
the technology innovatively transforms two groups of high-pressure air-rich boxes and high-pressure argon-rich boxes on the basis of unchanged original fine-grain hot-rolled steel bar production technology to improve the surface iron scale structure of the fine-grain steel bar. The thickness of the scale on the surface of the produced fine-grained steel bar is controlled to be 20-35 mu m, and the scale is made of FeO and 40-60% Fe3O4The iron oxide is compact, has good bonding degree with a matrix, is not easy to fall off, and has bluish surface color, thereby achieving the purposes of improving the surface quality and delaying rusting.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic view of the internal structure of a high pressure air-enriched air tank according to the present invention;
FIG. 2 is a schematic diagram comparing the prior art with the prior art.
In the figure: 1. a passageway box body; 2. a support bracket; 3. an annular nozzle; 4. an air duct; 5. connecting the transverse pipes; 6. an air inlet pipe; 7. and (5) rolling pieces.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technique for controlling a scale structure of a fine-grained hot-rolled steel bar on line, which comprises the following steps: the method comprises the following steps of billet heating, heating by a heating furnace, 6 frames of a rough rolling unit, 6 frames of a middle rolling unit, 1 group of temperature control water tanks, 6 frames of a finish rolling unit, four groups of temperature control water tanks, a cooling bed, and collection and packaging. The chemical components comprise, by mass, 0.21-0.25% of C, 0.35-0.55% of Si, 1.05-1.30% of Mn, less than or equal to 0.035% of P/S, less than or equal to 0.010% of V, and the balance of Fe and inevitable impurities.
On the basis of the original process route, four groups of finish-rolled temperature control water tanks are simply transformed, the surface scale oxide structure of the steel bar can be controlled on line after transformation, and the transformed route is as follows: a finish rolling outlet, a high-pressure air-rich box, 3 groups of temperature control water tanks, a high-pressure argon-rich box, an upper cooling bed, and collection and packaging; the high-pressure air-rich boxes and the temperature control water tanks are compactly arranged, and the temperature control water tanks and the high-pressure argon-rich boxes are arranged at intervals of 10 m.
Controlling the temperature of a finish rolling outlet rolled piece to be 950-1050 ℃;
high-pressure rich air injection: the original first group of temperature control water tank is transformed into a high-pressure air-rich tank, a plurality of groups of annular nozzles with the spacing of 0.8m are arranged in the tank, the compressed air pressure is controlled to be 0.6-1.2 MPa, air and waste heat and waste gas in a factory are subjected to heat exchange to 900-1000 ℃ and then are sprayed into the tank at high pressure, and the surface of the steel bar is promoted to form Fe at high temperature3O4；
Temperature control technology: the steel bars rich in air immediately enter the temperature control water tanks for cooling treatment, three groups of temperature control water tanks adopt a graded temperature control technology of quick cooling-temperature return-quick cooling-temperature return, and the maximum temperature difference between the inside and the outside of the steel bars is controlled not to exceed 350 ℃ and the instantaneous surface temperature is not lower than 500 ℃ during cooling, so that the steel bars are integrally cooled, the uniformity of the internal and external structure properties is improved, and the normal metallographic structure of the steel bars is ensured; the temperature control water tank adopts high-pressure vertical and reverse nozzles to cut off water by high-pressure air, so that no water is brought to the outlet of the water tank.
And (3) carrying out chemical reaction on the surface of the steel bar during temperature control: when the high-temperature steel bar is cooled by high-pressure water, Fe is generated on the surface of the high-temperature steel bar3O4Of the Fe3O4Is compact in the inner layer and is bonded with the matrixThe degree is good; the outer layer is black granular crystal with metallic luster, which reacts with water to generate Fe3O4Of the Fe3O4Contact with oxygen will produce Fe2O3So that the steel bar is rapidly cooled in an oxygen-free state after water cooling to inhibit the outer layer Fe3O4To Fe2O3The transformation of (3).
High-pressure argon-rich blowing: after the rolled piece is cooled by water, a group of high-pressure argon-rich gas boxes with the pressure of 0.6 MPa-1.2 MPa are added, wherein the high-pressure argon-rich gas boxes are the same as those in the step 4), are used for removing the steam water film attached to the surface of the temperature-controlled steel bar, isolating the contact between the steel bar and oxygen, and improving the cooling speed, so that the Fe on the surface layer of the steel bar is inhibited3O4To Fe2O3Transformation to avoid surface Fe2O3And (4) generation of red rust.
And (3) going to a cooling bed: the temperature of the steel bar on the cooling bed is controlled to be 730-780 ℃.
The temperature control range of each section of the steel bar is as follows:
in this embodiment, the structure of the high-pressure air-enriched box and the high-pressure argon-enriched box includes passageway box 1, support bracket 2, annular nozzle 3, air duct 4, connects violently pipe 5, intake pipe 6 and rolled piece 7, support bracket 2 is installed to the interior bottom of passageway box 1, and the top bearing of support bracket 2 is provided with rolled piece 7, the even cover in outside of rolled piece 7 is equipped with annular nozzle 3, and all communicates on the annular nozzle 3 and have air duct 4, one side of passageway box 1 is provided with connects violently pipe 5, the one end of air duct 4 all extends to passageway box 1 outside and violently manages 5 with being connected and be linked together, and connect and violently the intercommunication on pipe 5 and have intake pipe 6.
Those not described in detail in this specification are within the skill of the art.
The above embodiments are preferred embodiments of the present invention, and those skilled in the art can make variations and modifications to the above embodiments, therefore, the present invention is not limited to the above embodiments, and any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (4)
1. The technology for controlling the structure of the iron scale on line by the fine-grain hot-rolled steel bar is characterized by comprising the following steps of: the device comprises the following equipment: the process comprises the following steps of heating furnace, 6 frames of rough rolling unit, 6 frames of intermediate rolling unit, 6 frames of finishing rolling unit, high-pressure air-rich box, 4 groups of temperature-controlled water tanks, high-pressure argon-rich box and cooling bed, and comprises the following process flows:
the method comprises the following steps: heating the steel billet by a heating furnace for 80-100 min, wherein the tapping temperature is 1000-1050 ℃;
step two: carrying out rough rolling by utilizing 6 continuous rough rolling mill groups;
step three: carrying out rough rolling by utilizing a continuous 6-group medium rolling mill set;
step four: 1 group of temperature control water tanks are used for controlling the temperature of the rolled piece to be 900-1000 ℃ and then the rolled piece enters a finishing mill group;
step five: carrying out finish rolling by utilizing 6 continuous groups of finishing mill groups, and controlling the temperature of a rolled piece at a finish rolling outlet to be 950-1050 ℃;
step six: blowing by using a high-pressure rich air box, wherein a plurality of groups of annular nozzles with the spacing of 0.8m are arranged in the box, the pressure of compressed air is controlled to be 0.6-1.2 MPa, and the air and waste heat and waste gas in a plant are subjected to heat exchange to 900-1000 ℃ and then are blown into a box body at high pressure;
step seven: the steel bars sprayed by the high-pressure air-rich box immediately enter the temperature control water tanks for cooling treatment, the three groups of temperature control water tanks adopt a graded temperature control technology of quick cooling-temperature return-quick cooling-temperature return, and the maximum temperature difference between the inside and the outside of the steel bars is controlled not to exceed 350 ℃ and the instantaneous surface temperature is not lower than 500 ℃ during cooling so that the steel bars are integrally cooled;
step eight: blowing by using a high-pressure argon-rich gas box, adding a group of high-pressure argon-rich gas boxes which are the same as the steps in the sixth step after the rolled piece is cooled by water, wherein the pressure is 0.6-1.2 MPa, and the contact between the steel bar and oxygen is isolated;
step nine: putting the steel bar on a cooling bed, and controlling the temperature of the steel bar on the cooling bed to be 730-780 ℃;
step ten: and (6) collecting and packaging.
2. The technique for controlling the scale structure of the fine-grained hot-rolled steel bar on line according to the claim 1, which is characterized in that: the high-pressure air-rich boxes and the temperature control water tanks are compactly arranged, and the temperature control water tanks and the high-pressure argon-rich boxes are arranged at intervals of 10 m.
3. The technique for controlling the scale structure of the fine-grained hot-rolled steel bar on line according to the claim 1, which is characterized in that: and in the seventh step, the three groups of temperature control water tanks adopt high-pressure vertical water spraying cooling and high-pressure air water interception of a reverse nozzle at an outlet.
4. The technique for controlling the scale structure of the fine-grained hot-rolled steel bar on line according to the claim 1, which is characterized in that: the structure of the high-pressure air-enriched box and the high-pressure argon-enriched box comprises a passageway box body (1), a support bracket (2), an annular nozzle (3), an air guide pipe (4), a horizontal connecting pipe (5), an air inlet pipe (6) and a rolled piece (7), wherein the support bracket (2) is installed at the inner bottom of the passageway box body (1), the rolled piece (7) is supported at the top of the support bracket (2), the annular nozzle (3) is uniformly sleeved outside the rolled piece (7), the annular nozzle (3) is communicated with the air guide pipe (4), the horizontal connecting pipe (5) is arranged on one side of the passageway box body (1), one end of the air guide pipe (4) extends to the outside of the passageway box body (1) and is communicated with the horizontal connecting pipe (5), and the horizontal connecting pipe (5) is communicated with the air inlet pipe (6).
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| CN202111403327.XA CN114309061A (en) | 2021-11-24 | 2021-11-24 | Technology for controlling oxide scale structure of fine-grain hot-rolled steel bar on line |
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| CN202111403327.XA CN114309061A (en) | 2021-11-24 | 2021-11-24 | Technology for controlling oxide scale structure of fine-grain hot-rolled steel bar on line |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105132855A (en) * | 2015-09-29 | 2015-12-09 | 武汉赛恩冶金技术开发有限公司 | Novel process for producing hot rolled threaded steel with on-line surface rustproof function through post-rolling water penetration controlled cooling process |
| CN105583235A (en) * | 2015-12-28 | 2016-05-18 | 钢铁研究总院 | Method for controlling iron scale structures of hot-rolled steel bars by stepped cooling |
| 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 |
| CN110760757A (en) * | 2019-08-14 | 2020-02-07 | 钢铁研究总院 | Low-cost strengthening process of hot-rolled steel bar |
| CN111074152A (en) * | 2019-12-21 | 2020-04-28 | 钢铁研究总院 | Hierarchical controlled cooling process for 600 MPa-grade high-strength anti-seismic weather-resistant hot-rolled steel bars |
| CN113680814A (en) * | 2021-08-24 | 2021-11-23 | 攀钢集团研究院有限公司 | Method for controlling iron scale on surface of medium-carbon low-alloy wire |
-
2021
- 2021-11-24 CN CN202111403327.XA patent/CN114309061A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105132855A (en) * | 2015-09-29 | 2015-12-09 | 武汉赛恩冶金技术开发有限公司 | Novel process for producing hot rolled threaded steel with on-line surface rustproof function through post-rolling water penetration controlled cooling process |
| CN105583235A (en) * | 2015-12-28 | 2016-05-18 | 钢铁研究总院 | Method for controlling iron scale structures of hot-rolled steel bars by stepped cooling |
| 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 |
| CN110760757A (en) * | 2019-08-14 | 2020-02-07 | 钢铁研究总院 | Low-cost strengthening process of hot-rolled steel bar |
| CN111074152A (en) * | 2019-12-21 | 2020-04-28 | 钢铁研究总院 | Hierarchical controlled cooling process for 600 MPa-grade high-strength anti-seismic weather-resistant hot-rolled steel bars |
| CN113680814A (en) * | 2021-08-24 | 2021-11-23 | 攀钢集团研究院有限公司 | Method for controlling iron scale on surface of medium-carbon low-alloy wire |
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Application publication date: 20220412 |