CN112176158A - Annealing and bluing process for common cold-rolled coil - Google Patents
Annealing and bluing process for common cold-rolled coil Download PDFInfo
- Publication number
- CN112176158A CN112176158A CN202011071442.7A CN202011071442A CN112176158A CN 112176158 A CN112176158 A CN 112176158A CN 202011071442 A CN202011071442 A CN 202011071442A CN 112176158 A CN112176158 A CN 112176158A
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- CN
- China
- Prior art keywords
- temperature
- cooling
- common cold
- coil
- rolled coil
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- C21D1/26—Methods of annealing
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/12—Oxidising using elemental oxygen or ozone
- C23C8/14—Oxidising of ferrous surfaces
Abstract
The invention discloses an annealing and bluing process of a common cold-rolled coil, which comprises the following steps: 1) keeping the temperature of the common cold-rolled coil heated to the process temperature of 650-710 ℃ for 6-9 hours under the protection of nitrogen for annealing; 2) cooling a common cold-rolled strip cover to 400 ℃ along with furnace air cooling under the protection of nitrogen; 3) stopping air cooling, naturally and slowly cooling the common cold-rolled coil in a cover to 360 ℃ for 60-120Min, and performing the homogenization of the whole cold-rolled coil temperature; 4) discharging a common cold-rolled coil at a high temperature of 360 ℃, placing the cold-rolled coil on a final cooling platform, keeping 8000Pa forced air cooling by a cooling fan until the temperature of the steel coil is reduced to 160 ℃, and controlling the oxidation bluing treatment temperature of the steel coil to be 160-360 ℃; 5) and stopping forced air cooling, and naturally cooling the steel coil to room temperature. The method of the invention is adopted to treat the common cold-rolled coil, which can not only ensure good annealing quality, but also obtain uniform bluing effect.
Description
Technical Field
The invention relates to an annealing and bluing process of a common cold-rolled coil.
Background
At present, the process for producing the common cold-rolled coil is to carry out bright annealing on the cold coil through an all-hydrogen bell-type furnace, and then carry out surface oiling for delivery to users, so that the product achieves the aim of smooth surface and no rust. Because the cold-rolled coil is subjected to bright annealing in an all-hydrogen bell-type furnace, the surface of the steel coil is pure iron and is easy to oxidize in a pure reducing atmosphere, and therefore, the surface of the steel coil is coated with a layer of anti-rust oil after annealing to prevent the steel coil from rusting in the prior art; and for users, the rust preventive oil on the surface of the cold-rolled coil must be cleaned after the cold-rolled coil is finally processed and formed, so that the discharge of cleaning sewage generated becomes a pain problem for the downstream users. The surface protection of the steel coil mainly has two modes, one mode is to coat anti-rust oil; the other is to perform bluing treatment on the surface. The surface of the traditional common cold-rolled coil is protected by antirust oil, and the processes of annealing and bluing the common cold-rolled coil by a bell-type furnace are not adopted at present.
The annealing bluing process is realized by a bell-type furnace instead of the silicon steel sheet heat treatment by some manufacturers, nitrogen or nitrogen plus a small amount of hydrogen is used as protective gas, the scattered sheet annealing and bluing mode is adopted, after oil removal is carried out after the temperature is raised to about 300 ℃ for a period of time, the protective gas is introduced, the temperature is continuously raised to 760 and 800 ℃, the temperature is kept for about 2 hours, the annealed silicon steel sheet is cooled to below 300 ℃ after the bluing process is carried out by filling water vapor at about 450 ℃ in the cooling process, and the annealed silicon steel sheet is taken out of the furnace after being cooled to below 300 ℃.
Placing silicon steel sheets in a bell-type furnace by part of manufacturers, carrying out annealing treatment in a hydrogen atmosphere, vacuumizing an inner cover of the bell-type furnace when a sample is slowly cooled to the temperature of 300-95000 Pa, introducing a bluing aqueous solution medium into the bell-type furnace, and keeping the temperature for 20-60 min; vacuumizing again, filling nitrogen for cooling, and discharging the product when the temperature is less than 150 ℃. The disadvantage of this process is the complexity of the process, the need for vacuum equipment and the addition of aqueous bluing solutions.
Disclosure of Invention
The invention aims to provide an annealing and bluing process for a common cold-rolled coil, which can ensure good annealing quality and obtain uniform bluing effect.
The annealing and bluing process for common cold-rolled coils for achieving the purpose comprises the following steps:
1) keeping the temperature of the common cold-rolled coil heated to the process temperature of 650-710 ℃ for 6-9 hours under the protection of nitrogen for annealing;
2) cooling a common cold-rolled strip cover to 400 ℃ along with furnace air cooling under the protection of nitrogen;
3) stopping air cooling, naturally and slowly cooling the common cold-rolled coil in a cover to 360 ℃ for 60-120Min, and performing the homogenization of the whole cold-rolled coil temperature;
4) discharging a common cold-rolled coil at a high temperature of 360 ℃, placing the cold-rolled coil on a final cooling platform, keeping 8000Pa forced air cooling by a cooling fan until the temperature of the steel coil is reduced to 160 ℃, and controlling the oxidation bluing treatment temperature of the steel coil to be 160-360 ℃;
5) and stopping forced air cooling, and naturally cooling the steel coil to room temperature.
By applying the bell-type furnace annealing and bluing process, the annealing bluing process of the common cold-rolled coil can be better realized, the good annealing quality can be ensured, and the uniform bluing effect can be obtained. By adopting the process, the common cold-rolled blueing steel coil meeting the requirements of downstream users can be produced under the condition of not increasing the equipment investment and the production cost. Opens up a new way for producing common cold-rolled coils.
Detailed Description
An annealing and bluing process for a common cold-rolled coil, comprising the steps of:
1) keeping the temperature of the common cold-rolled coil heated to the process temperature of 650-710 ℃ for 6-9 hours under the protection of nitrogen for annealing;
2) cooling a common cold-rolled strip cover to 400 ℃ along with furnace air cooling under the protection of nitrogen;
3) stopping air cooling, naturally and slowly cooling the common cold-rolled coil in a cover to 360 ℃ for 60-120Min, and performing the homogenization of the whole cold-rolled coil temperature;
4) discharging a common cold-rolled coil at a high temperature of 360 ℃, placing the cold-rolled coil on a final cooling platform, keeping 8000Pa forced air cooling by a cooling fan until the temperature of the steel coil is reduced to 160 ℃, and controlling the oxidation bluing treatment temperature of the steel coil to be 160-360 ℃;
5) and stopping forced air cooling, and naturally cooling the steel coil to room temperature.
The invention is suitable for steel rolling and comprises the following components: the steel production enterprises of the tool equipment for cold rolling and pickling, cold rolling and rolling machine, cold rolling and annealing, flattening and recoiling and packaging.
Claims (1)
1. An annealing and bluing process for common cold-rolled coils is characterized by comprising the following steps:
1) keeping the temperature of the common cold-rolled coil heated to the process temperature of 650-710 ℃ for 6-9 hours under the protection of nitrogen for annealing;
2) cooling a common cold-rolled strip cover to 400 ℃ along with furnace air cooling under the protection of nitrogen;
3) stopping air cooling, naturally and slowly cooling the common cold-rolled coil in a cover to 360 ℃ for 60-120Min, and performing the homogenization of the whole cold-rolled coil temperature;
4) discharging a common cold-rolled coil at a high temperature of 360 ℃, placing the cold-rolled coil on a final cooling platform, keeping 8000Pa forced air cooling by a cooling fan until the temperature of the steel coil is reduced to 160 ℃, and controlling the oxidation bluing treatment temperature of the steel coil to be 160-360 ℃;
5) and stopping forced air cooling, and naturally cooling the steel coil to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011071442.7A CN112176158A (en) | 2020-10-09 | 2020-10-09 | Annealing and bluing process for common cold-rolled coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011071442.7A CN112176158A (en) | 2020-10-09 | 2020-10-09 | Annealing and bluing process for common cold-rolled coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112176158A true CN112176158A (en) | 2021-01-05 |
Family
ID=73948919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011071442.7A Withdrawn CN112176158A (en) | 2020-10-09 | 2020-10-09 | Annealing and bluing process for common cold-rolled coil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112176158A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113234916A (en) * | 2021-05-21 | 2021-08-10 | 新疆八一钢铁股份有限公司 | Cover type annealing process for HC340LA low-alloy high-strength steel cold-rolled coil |
| CN113265513A (en) * | 2021-05-21 | 2021-08-17 | 新疆八一钢铁股份有限公司 | Annealing process for eliminating banded structure of 25 steel cold-rolled sheet |
| CN113430347A (en) * | 2021-06-24 | 2021-09-24 | 新疆八一钢铁股份有限公司 | Cover annealing and flattening process of low-manganese B280VK carbon structural steel cold-rolled sheet |
| CN113637832A (en) * | 2021-08-13 | 2021-11-12 | 新疆八一钢铁股份有限公司 | Production method of SPCC-W black skin steel plate |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1084547B (en) * | 1958-10-22 | 1960-06-30 | Dr Werner Herdieckerhoff | Process for surface oxidation, in particular for blueing, of steel goods |
| CN101082075A (en) * | 2006-05-29 | 2007-12-05 | 宝山钢铁股份有限公司 | Process and device for coating-free electrical steel annealing and bluing |
| CN101871041A (en) * | 2010-07-14 | 2010-10-27 | 吴建荣 | Continuous annealing bluing process of sheet punching work piece of cold rolling silicon steel sheet |
| CN102409347A (en) * | 2011-12-05 | 2012-04-11 | 佛山南方广恒钢铁有限公司 | Continuous annealing and darkening integrated process for steel coil and production line |
| CN103147084A (en) * | 2013-01-23 | 2013-06-12 | 新余钢铁集团有限公司 | Vertical continuous annealing furnace bluing device and bluing technology thereof |
| CN106048507A (en) * | 2016-07-18 | 2016-10-26 | 华南理工大学 | Decarburizing annealing and blueing treatment method for Si-free Mn-containing semi-processed non-oriented silicon steel |
| CN106755871A (en) * | 2016-12-14 | 2017-05-31 | 安徽楚江特钢有限公司 | A kind of cold-rolled strip manufacture method for deep-draw application high |
-
2020
- 2020-10-09 CN CN202011071442.7A patent/CN112176158A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1084547B (en) * | 1958-10-22 | 1960-06-30 | Dr Werner Herdieckerhoff | Process for surface oxidation, in particular for blueing, of steel goods |
| CN101082075A (en) * | 2006-05-29 | 2007-12-05 | 宝山钢铁股份有限公司 | Process and device for coating-free electrical steel annealing and bluing |
| CN101871041A (en) * | 2010-07-14 | 2010-10-27 | 吴建荣 | Continuous annealing bluing process of sheet punching work piece of cold rolling silicon steel sheet |
| CN102409347A (en) * | 2011-12-05 | 2012-04-11 | 佛山南方广恒钢铁有限公司 | Continuous annealing and darkening integrated process for steel coil and production line |
| CN103147084A (en) * | 2013-01-23 | 2013-06-12 | 新余钢铁集团有限公司 | Vertical continuous annealing furnace bluing device and bluing technology thereof |
| CN106048507A (en) * | 2016-07-18 | 2016-10-26 | 华南理工大学 | Decarburizing annealing and blueing treatment method for Si-free Mn-containing semi-processed non-oriented silicon steel |
| CN106755871A (en) * | 2016-12-14 | 2017-05-31 | 安徽楚江特钢有限公司 | A kind of cold-rolled strip manufacture method for deep-draw application high |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113234916A (en) * | 2021-05-21 | 2021-08-10 | 新疆八一钢铁股份有限公司 | Cover type annealing process for HC340LA low-alloy high-strength steel cold-rolled coil |
| CN113265513A (en) * | 2021-05-21 | 2021-08-17 | 新疆八一钢铁股份有限公司 | Annealing process for eliminating banded structure of 25 steel cold-rolled sheet |
| CN113430347A (en) * | 2021-06-24 | 2021-09-24 | 新疆八一钢铁股份有限公司 | Cover annealing and flattening process of low-manganese B280VK carbon structural steel cold-rolled sheet |
| CN113637832A (en) * | 2021-08-13 | 2021-11-12 | 新疆八一钢铁股份有限公司 | Production method of SPCC-W black skin steel plate |
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| WW01 | Invention patent application withdrawn after publication | ||
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Application publication date: 20210105 |