CN111187890A - Method for eliminating rust of phosphorus-containing high-strength steel - Google Patents
Method for eliminating rust of phosphorus-containing high-strength steel Download PDFInfo
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- CN111187890A CN111187890A CN202010127473.3A CN202010127473A CN111187890A CN 111187890 A CN111187890 A CN 111187890A CN 202010127473 A CN202010127473 A CN 202010127473A CN 111187890 A CN111187890 A CN 111187890A
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- temperature
- phosphorus
- aging
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- containing high
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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
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 44
- 239000011574 phosphorus Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 18
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 44
- 230000032683 aging Effects 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 9
- 239000001257 hydrogen Substances 0.000 claims abstract description 9
- 238000010583 slow cooling Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 14
- 230000007797 corrosion Effects 0.000 claims description 11
- 238000005260 corrosion Methods 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 238000005485 electric heating Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 abstract description 5
- 230000000171 quenching effect Effects 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to a method for eliminating rust of phosphorus-containing high-strength steel, which comprises the following steps: keeping the temperature of the strip steel for 2-3 min in the aging section within the range of 280-450 ℃, controlling the temperature of the aging section below 300 ℃, controlling the temperature of the final cooling section below 175 ℃ and controlling the final cooling at 100 ℃; controlling the furnace pressure: the furnace pressure is more than 3 hpa; the slow cooling fan is less than 75 percent, and the fast cooling fan is less than 90 percent; the hydrogen content is controlled to be 4-15%. The advantages are that: the temperature of the strip steel is reduced by reducing the aging temperature, so that the strip steel can be cooled better at the final cooling section, the cooling efficiency of a final air cooler is improved, meanwhile, the temperature of the strip steel entering a water quenching tank is reduced by 70 ℃ compared with that of the raw material, and the water temperature in the water quenching tank can be stably controlled below 35 ℃.
Description
Technical Field
The invention relates to a method for eliminating rust of phosphorus-containing high-strength steel, in particular to a method for preventing grid rust and oxidation color difference from being generated on the surface of phosphorus-containing high-strength steel produced by a continuous annealing unit.
Background
The phosphorus-containing high-strength steel has the phosphorus element content range of 0.07-011 Wt%, the performance range of 250-330MPa, and the phosphorus content is higher than that of common steel, so that the element enhances the surface activity of the strip steel, and the steel is easy to have two types of defects, namely grid corrosion of a water cooling section and oxidation color difference in a furnace.
The latticed corrosion of the water cooling section is mainly generated in summer, the temperature of the water cooling section floats at about 41 ℃ in summer, and the temperature of the water cooling section in other seasons is about 35 ℃. During production, the temperature of the water cooling section is too high, and the phosphorus-containing high-strength steel is easy to be corroded in a grid shape.
The second problem is the oxidation color difference in the furnace, because of the special requirements of the product process and components, the phosphorus-containing high-strength steel requires rapid cooling in the slow cooling section and the fast cooling section, and simultaneously requires higher process speed of the heating section, and because of the special process, the fan load of the slow cooling section and the fast cooling section is often more than 75 percent and 90 percent. Too high fan rotational speed can make the fan input port of bellows passageway produce the negative pressure, because furnace body bellows manhole or camera observation hole or bell are sealed not good, and external gas flows into the stove this moment, makes oxygen content appear increasing, and the bluish oxidation that easily appears this moment discovers that thickness is greater than 1.5 mm's variety is especially serious in the production.
In the prior art, Chinese patent CN201711049844.5, a method for eliminating surface color difference defects of phosphorus-containing high-strength IF steel, is to heat a phosphorus-containing high-strength IF steel slab; carrying out rough rolling and finish rolling on the heated phosphorus-containing high-strength IF steel plate blank to obtain a finish-rolled phosphorus-containing high-strength IF steel plate; the single pass rate of the cold rolling reduction is below 30 percent, and the cold-rolled phosphorus-containing high-strength IF steel plate is obtained; and carrying out continuous annealing treatment on the cold-rolled phosphorus-containing high-strength IF steel plate. The invention solves or partially solves the technical problem of the surface color difference defect of the phosphorus-containing high-strength IF steel in the prior art, and realizes the technical effect of eliminating the surface color difference defect of the phosphorus-containing high-strength IF steel so as to improve the surface quality of the phosphorus-containing high-strength IF steel.
Chinese patent CN201210560624.X, a production method for eliminating the surface color difference of a cold-rolled plate, can realize the implementation of the invention under the condition that the original equipment condition is not changed, and does not increase the production cost; the technological parameters involved in the invention are simple to control, the operability is strong, the implementation effect is obvious, and the surface quality of the cold-rolled sheet is stable.
Chinese patent CN201510622935.8, a production method for eliminating the surface color difference of a cold-rolled sheet, ensures that the surface of the cold-rolled sheet has no strip-shaped color difference in the smooth roll rolling state, and greatly improves the surface quality and the product grade of the cold-rolled sheet.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for eliminating the rust of the phosphorus-containing high-strength steel, solve the problem of the rust of the phosphorus-containing high-strength steel, reduce the grid rust and the oxidation color difference generated on the surface of the phosphorus-containing high-strength steel and stabilize the batch production.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for eliminating rust corrosion of phosphorus-containing high-strength steel comprises the following steps:
1) temperature control: keeping the temperature of the strip steel for 2-3 min in the aging section within the range of 280-450 ℃, wherein the aging section is divided into three parts, namely aging I, aging II and aging III, the temperature of the aging III is controlled below 300 ℃, the temperature of the final cooling section is controlled below 175 ℃, and the final cooling is controlled at 100 ℃;
2) controlling the furnace pressure: the furnace pressure is more than 3 hpa;
3) fan load: the slow cooling fan is less than 75 percent, and the fast cooling fan is less than 90 percent;
4) the hydrogen content is controlled to be 4-15%.
Before the production of the phosphorus-containing high-strength steel, steel grades with thickness smaller than that of the phosphorus-containing high-strength steel to be produced are produced, the temperature of an aging section is reduced, the temperature of an aging section is ensured to be below 300 ℃, the set temperature of a final cooling fan is set to be below 100 ℃, and the temperature of a water cooling section is controlled to be below 35 ℃.
Before the production of the phosphorus-containing high-strength steel, the steel grade with the thickness smaller than that of the phosphorus-containing high-strength steel to be produced cannot be produced, 6 coils are advanced, an auxiliary electric heating device of the aging section is closed, meanwhile, furnace gas circulation of the aging section is increased, hot atmosphere is taken away, the temperature of the aging section is reduced to be below 300 ℃, and the temperature of the water cooling section is controlled to be below 35 ℃.
In the step 2), the pressure of the furnace area is more than 3hpa by increasing the injection amount of the protective gas; meanwhile, the hydrogen content in the protective gas is increased from 4% to 10% in the fast cooling section, the gas diffusion of the fast cooling section is increased, the slow cooling fan is less than 75%, and after the fast cooling fan is less than 90%, the oxygen content is less than 9 ppm.
Compared with the prior art, the invention has the beneficial effects that:
the method reduces the temperature of the strip steel by reducing the aging temperature, is convenient for the strip steel to be cooled in a final cooling section better, improves the cooling efficiency of a final air cooler, simultaneously reduces the temperature of the strip steel entering a water quenching tank by 70 ℃ compared with the temperature of raw materials, ensures that the water temperature in the water quenching tank can be stably controlled below 35 ℃, does not generate the problem of rust corrosion of the phosphorus-containing high-strength steel after adopting the method, does not generate grid rust and oxidation color difference on the surface of the phosphorus-containing high-strength steel, and realizes stable batch production of the phosphorus-containing high-strength steel.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
A method for eliminating the rust corrosion of high-strength steel containing phosphorus features that the rust corrosion of high-strength steel containing phosphorus is controlled by controlling the temp of ageing stage, water-cooling stage, load of final cooling fan, hydrogen content of fast cooling stage, and scheduling. The concrete measures comprise:
1) temperature control: the aging section has the functions of removing carbon in steel particles, keeping the temperature of the strip steel for 2min within the range of 280-450 ℃, transferring the carbon to the periphery of the particles, dividing the aging section into three parts, namely aging I, aging II and aging III, setting the temperature of the aging III to be below 300 ℃, cooling the strip steel from the overaging temperature to the temperature acceptable by entering a water quenching tank by the final cooling section, controlling the final cooling to be below 175 ℃, and being more beneficial to reducing the corrosion risk.
2) Controlling the furnace pressure: the furnace pressure is more than 3 hPa;
3) fan load: the slow cooling fan is less than 75 percent, and the fast cooling fan is less than 90 percent;
4) the hydrogen content is controlled to be 4-15%, and for the purpose of improving reducibility and cost, the hydrogen content is preferably controlled to be 10%.
During actual production, before the phosphorus-containing high-strength steel is produced, steel grades with thickness smaller than that of the phosphorus-containing high-strength steel are produced, the temperature of an aging section is reduced in a heat transfer mode, the temperature of the aging section is reduced to a certain extent, the temperature of an aging section is guaranteed to be below 300 ℃, then the set temperature of a final cooling fan is set to be 100 ℃, thermal shock of strip steel to a water cooling section is reduced, and the temperature of the water cooling section is controlled to be below 35 ℃.
If the variety with the thickness lower than that of the phosphorus-containing high-strength steel cannot be produced before the phosphorus-containing high-strength steel is produced, 6 coils are advanced, the auxiliary electric heating device of the aging section is closed, and meanwhile, the furnace gas circulation of the aging section is increased to take away the hot atmosphere. Specifically, the gas injection amount and the diffusion amount of the aging section are manually operated, and the protective gas circulation of the aging section is increased to reduce the temperature of the aging section.
Aiming at the problem of oxidation color difference in the furnace, the pressure in the furnace area is larger than 3hPa by increasing the injection amount of protective gas. Simultaneously promote the hydrogen content in the protective gas at the fast cold section, reinforcing reduction effect to the gaseous diffusion of increaseing the fast cold section, change and beat the glue the sealing device of fast cold section manhole simultaneously, reduce the outside air and get into. After the loads of the slow cooling fan and the quick cooling fan are respectively less than 75% and 90%, the oxygen content is less than 9ppm, and large-area batch oxidation cannot occur.
Claims (4)
1. A method for eliminating rust corrosion of phosphorus-containing high-strength steel is characterized by comprising the following steps:
1) temperature control: keeping the temperature of the strip steel for 2-3 min in the aging section within the range of 280-450 ℃, wherein the aging section is divided into three parts, namely aging I, aging II and aging III, the temperature of the aging III is controlled below 300 ℃, the temperature of the final cooling section is controlled below 175 ℃, and the final cooling is controlled at 100 ℃;
2) controlling the furnace pressure: the furnace pressure is more than 3 hpa;
3) fan load: the slow cooling fan is less than 75 percent, and the fast cooling fan is less than 90 percent;
4) the hydrogen content is controlled to be 4-15%.
2. The method for eliminating the rust corrosion of the phosphorus-containing high-strength steel as claimed in claim 1, wherein before the phosphorus-containing high-strength steel is produced, steel grades with thickness smaller than that of the phosphorus-containing high-strength steel to be produced are produced, the temperature of an aging section is reduced, the temperature of an aging section is ensured to be below 300 ℃, the set temperature of a final cooling fan is set to be below 100 ℃, and the temperature of a water cooling section is controlled to be below 35 ℃.
3. The method for eliminating the rust corrosion of the phosphorus-containing high-strength steel as claimed in claim 1, wherein the steel grade with the thickness smaller than that of the phosphorus-containing high-strength steel to be produced cannot be produced before the phosphorus-containing high-strength steel is produced, 6 coils are advanced, the auxiliary electric heating device of the aging section is closed, meanwhile, the furnace gas circulation of the aging section is increased, the hot atmosphere is taken away, the temperature of the aging section is reduced to be below 300 ℃, and the temperature of the water cooling section is controlled to be below 35 ℃.
4. The method for eliminating the rust corrosion of the phosphorus-containing high-strength steel as claimed in claim 1, wherein the pressure in the furnace area is higher than 3hpa by increasing the injection amount of the protective gas in the step 2); meanwhile, the hydrogen content in the protective gas is increased from 4% to 10% in the fast cooling section, the gas diffusion of the fast cooling section is increased, the slow cooling fan is less than 75%, and after the fast cooling fan is less than 90%, the oxygen content is less than 9 ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010127473.3A CN111187890A (en) | 2020-02-28 | 2020-02-28 | Method for eliminating rust of phosphorus-containing high-strength steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010127473.3A CN111187890A (en) | 2020-02-28 | 2020-02-28 | Method for eliminating rust of phosphorus-containing high-strength steel |
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| Publication Number | Publication Date |
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| CN111187890A true CN111187890A (en) | 2020-05-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010127473.3A Pending CN111187890A (en) | 2020-02-28 | 2020-02-28 | Method for eliminating rust of phosphorus-containing high-strength steel |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111659741A (en) * | 2020-05-28 | 2020-09-15 | 鞍钢股份有限公司 | Method for controlling point rust on surface of strip steel in cold rolling continuous annealing path |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648178A (en) * | 2016-03-07 | 2016-06-08 | 首钢京唐钢铁联合有限责任公司 | Method for controlling oxide color of dual-phase steel in cold rolling continuous annealing process |
| CN107164624A (en) * | 2017-04-10 | 2017-09-15 | 首钢总公司 | A kind of method for controlling phosphorous cold rolling high-strength steel surface pit defect |
| CN107893155A (en) * | 2017-10-31 | 2018-04-10 | 首钢集团有限公司 | Method for eliminating surface color difference defect of phosphorus-containing high-strength IF steel |
| CN110358979A (en) * | 2019-07-30 | 2019-10-22 | 包头钢铁（集团）有限责任公司 | A kind of 400MPa grades of Cold Rolled High Strength IF Steel and preparation method thereof |
-
2020
- 2020-02-28 CN CN202010127473.3A patent/CN111187890A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648178A (en) * | 2016-03-07 | 2016-06-08 | 首钢京唐钢铁联合有限责任公司 | Method for controlling oxide color of dual-phase steel in cold rolling continuous annealing process |
| CN107164624A (en) * | 2017-04-10 | 2017-09-15 | 首钢总公司 | A kind of method for controlling phosphorous cold rolling high-strength steel surface pit defect |
| CN107893155A (en) * | 2017-10-31 | 2018-04-10 | 首钢集团有限公司 | Method for eliminating surface color difference defect of phosphorus-containing high-strength IF steel |
| CN110358979A (en) * | 2019-07-30 | 2019-10-22 | 包头钢铁（集团）有限责任公司 | A kind of 400MPa grades of Cold Rolled High Strength IF Steel and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111659741A (en) * | 2020-05-28 | 2020-09-15 | 鞍钢股份有限公司 | Method for controlling point rust on surface of strip steel in cold rolling continuous annealing path |
| CN111659741B (en) * | 2020-05-28 | 2022-03-22 | 鞍钢股份有限公司 | Method for controlling point rust on surface of strip steel in cold rolling continuous annealing path |
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Application publication date: 20200522 |