CN102816986A - Strip steel continuous hot galvanizing method - Google Patents
Strip steel continuous hot galvanizing method Download PDFInfo
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- CN102816986A CN102816986A CN2011101566624A CN201110156662A CN102816986A CN 102816986 A CN102816986 A CN 102816986A CN 2011101566624 A CN2011101566624 A CN 2011101566624A CN 201110156662 A CN201110156662 A CN 201110156662A CN 102816986 A CN102816986 A CN 102816986A
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- band steel
- hot galvanizing
- strip steel
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Abstract
The invention discloses a strip steel continuous hot galvanizing method. The strip steel continuous hot galvanizing method sequentially comprises the following steps of washing and pre-heating strip steel, adopting short flame to heat the strip steel to be at the temperature of 550-700 DEG C in a strip steel directly contacted mode, adopting a radiant tube heating method to continue to heat the strip steel to be at the temperature of 700-850 DEG C, sequentially soaking and slowly cooling the strip steel, adopting nitrogen and hydrogen mixed gas with 5-70% of hydrogen volume to quickly cool the strip steel to be at the temperature of 150-550 DEG C, heating the strip steel again to be at the temperature of 450-550 DEG C, performing secondary soaking to the strip steel and performing hot galvanizing treatment to the strip steel. By means of the method, the platability of ultrahigh strong steel can be obviously improved, various annealing curves can be achieved flexibly, and annealing processes which cannot be achieved by a traditional hot galvanizing unit can be achieved. In addition, the 'zinc scale' detect in starting of the unit can be obviously overcome.
Description
Technical field
The present invention relates to a kind of band steel continuous annealing heat treating method, relate in particular to band steel continuous hot galvanizing method.
Background technology
Hot-dip galvanized steel strip is a kind of common metallurgic product, and it is to make molten metal and iron-based precursor reactant and produce alloy layer, thereby makes matrix and the two a kind of band steel that combines of coating.It is even that hot-dip galvanized steel strip has coating, strong adhesion, advantages such as long service life.
Traditional band steel continuous hot galvanizing method mainly contains two kinds:
A: cleaning → preheating → heating → soaking → slow cooling → cold soon (being cooled to 450～500 ℃) → pot galvanize → air knife winding-up → up cooling section cooling → descending cooling section cools off → water-cooled once more.
B: cleaning → preheating → heating → soaking → slow cooling → cold soon (being cooled to 450～500 ℃) → soaking once more (450～500 ℃ of soaking temperatures) → pot galvanize → air knife winding-up → up cooling section cooling → descending cooling section cools off → water-cooled once more.
The common ground of above-mentioned hot galvanizing method is: the band steel carries out carrying out pot galvanize after the subsequent heat treatment such as preheating, heating and soaking.This method is suitable for producing common carbon aluminium-killed steel, IF steel, high-strength IF steel, baking hardened steel, low-alloy high-strength steel and the intensity rank common high-strength steel below the 780MPa rank.But for 780MPa level and the above super-high strength steel of 780MPa level (like dual phase steel, TRIP steel etc.); Owing to contain strengthening elements such as higher Si, Mn in these super-high strength steels; In hot galvanizing process, be easy to occur the plating leakage defective; And binding force of cladding material is relatively poor, and steel plate coating when 180 degree are folding is easy to occur exfoliate problem.In addition; Along with the development of pot galvanize product, traditional heating, soaking, slow cooling, hot galvanizing method cold, soaking again can not satisfy the requirement of product innovation soon, and some product requirements are as cold as below 400 ℃ soon; Even be as cold as soon below 200 ℃, and then carry out pot galvanize.In addition, traditional hot galvanizing method is after unit is opened bell to overhaul, wear operation such as band again during the start operation, because the lehre volume is bigger; Furnace temperature is lower toward contact, and the belt steel temperature before the pot galvanize need be with steel operation 1～2 volume just can reach processing requirement usually, makes the zinc of start coil of strip belt steel surface combine not firm with the band steel; Being easy to slabbing comes off; Be usually said " rolled tin " defective, the not only easy contaminate subsequent roller of " rolled tin " defective causes the roll marks defective; Also can cause the waste of band steel and zinc liquid, increase production cost.
Summary of the invention
Deficiency to above-mentioned traditional hot galvanized method; The object of the present invention is to provide a kind of band steel continuous hot galvanizing method; Use this hot galvanizing method not only can significantly improve the platability of super-high strength steels such as dual phase steel, TRIP steel; And can realize the thermal treatment of existing whole pot galvanize products, use this method can also reduce unit simultaneously and open band steel and the waste of zinc liquid that is caused when bell overhauls, wears after the operation such as band start operation again, and then avoid or reduce " rolled tin " defective.
According to the foregoing invention purpose, the invention provides a kind of band steel continuous hot galvanizing method, it comprises the following steps:
(1) carries out preheating after the band steel cleans;
(2) adopt short flame will be with steel to be heated to 550～700 ℃ over against the mode that the band steel directly contacts;
(3) adopt the method for radiator tube heating to continue heating zone steel to 700～850 ℃;
(4) the band steel is carried out the gentle deepfreeze of soaking successively;
(5) adopting hydrogen volume content is that 5～70% nitrogen hydrogen mixeding gas will be with steel to be quickly cooled to 150～550 ℃;
(6) the band steel is heated once more, be heated to 450～550 ℃;
(7) the band steel is carried out the secondary soaking;
(8) the band steel being carried out pot galvanize handles.
Preferably, the preheating temperature in the said step (1) is 200～350 ℃.
Preferably, the heating by the exhaust gases band steel that adopts short flame to be produced in the said step (1).
Preferably, the short flame in the said step (2) is the short flame that combustion of natural gas produced.
Preferably, adopt the mode of radiator tube soaking that the band steel is carried out equal thermal treatment in the said step (4), adopt the mode of jet slow cooling that the band steel is carried out the slow cooling processing.
Preferably, speed of cooling is 50～150 ℃/s in the said step (5).
Preferably, the mode that adds the thermal recovery induction heating in the said step (6) once more.
Preferably, the temperature of secondary soaking is 430～500 ℃ in the said step (7).
Preferably, the zinc liquid temperature of pot galvanize is 445～465 ℃ in the said step (8).
Preferably, the aluminium that contains 0.15～0.30wt% in the said step (8) in the zinc liquid of pot galvanize.
The core of technical scheme of the present invention is: after the preheating band steel is carried out twice heating, be followed successively by over against straight fire heating of the short flame of band steel and radiator tube heating, make belt steel surface carry out preoxidation earlier; Form thin products such as FeO at belt steel surface; Hinder elements such as Si, Mn to the surface of steel plate enrichment, make elements such as Si, Mn only in the internal oxidation of surface of steel plate, the oxide compound of element such as Si, Mn just can not influence the platability of band steel like this; And in follow-up heat treatment process; The most surperficial product thin layers such as FeO of band steel are fully reduced, and forming with the pure iron is master's surface, thereby obtains good platability; It is cold soon to adopt hydrogen volume content to be that 5～70% nitrogen hydrogen mixeding gas carries out at fast cold section, can be cooled to 150～550 ℃ to the band steel rapidly, thereby satisfy the processing requirement of product innovations such as complex phase steel; Increase the reheat step after cold the band steel is carried out the reheat processing fast, will be with the rapid reheat to 450 of steel～550 ℃, thereby satisfy the hot dip galvanizing process requirement.This technological design not only can obviously improve the platability of super-high strength steel; And can realize various annealing curves neatly; The annealing process that makes the zinc-plated unit of traditional hot to realize can both realize, in addition, and " rolled tin " defective when it can also obviously reduce the unit start.
Need to prove; For the described cleaning of step (1), pre-heating step in the present technique scheme; Described soaking of step (4) and slow cooling step; The temperature of secondary soaking and the concrete process step of pot galvanize all can adopt the concrete processing parameter in the traditional hot zincincation, its same implementation result that can realize the present technique scheme with above-mentioned each optimized technical scheme in the speed of cooling in the step (5), step (7); Because these processing parameters can be the processing parameter of often being selected for use in the present technique field, so the present invention does not make restriction to these parameters.Just when the pot galvanize of band steel, if the optimal technical scheme of selecting for use the present invention to introduce will obtain the better implement effect.
Embodiment
Adopt following step that the band steel is carried out pot galvanize, the concrete processing parameter of each step is seen table 1 among this case embodiment 1-6:
(1) carry out preheating after the band steel cleans, preheating temperature is 200～350 ℃;
(2) adopt the short flame of combustion of natural gas will be with steel to be heated to 550～700 ℃ (being expressed as straight fiery Heating temperature in the table 1) over against the mode that the band steel directly contacts;
(3) adopt the method for radiator tube heating to continue heating zone steel to 700～850 ℃;
(4) the band steel is carried out the radiator tube soaking, soaking temperature is 700～850 ℃ (being expressed as soaking temperature in the table 1 one time);
(5) will be with the jet slow cooling to 630 of steel～750 ℃;
(6) adopting hydrogen volume content is that 5～70% nitrogen hydrogen mixeding gas will be with steel to be quickly cooled to 150～550 ℃, and speed of cooling is 50～150 ℃/s;
(7) adopt electromagnetic induction heater will be with steel to be heated to 450～550 ℃ once more;
(8) the band steel is carried out the secondary soaking, soaking temperature is 430～500 ℃;
(8) the band steel is carried out pot galvanize and handle, zinc liquid temperature is 445～465 ℃, contains the aluminium of 0.15～0.30wt% in the control zinc liquid.
Table 1.
For the effect between hot galvanizing method more of the present invention and the traditional hot galvanized method; The contriver also adopts two kinds of traditional hot galvanized methods (A and B) and the hot galvanizing method of the present invention (C) introduced in this case background technology respectively ordinary band steel (carbon aluminium-killed steel, IF steel, high-strength IF steel, baking hardened steel, low-alloy high-strength steel) and 780～1280MPa grade super strength band steel (dual phase steel, TRIP steel, complex phase steel) to be carried out repeatedly pot galvanize test; And test-results listed in table 2 (comparing result in the table 2 is test of many times result's summary, is not the result for single test).
Table 2. performance comparison
All have " rolled tin " defective and all have " rolled tin " defective
Can find out that from table 2 the hot galvanizing method of the present invention especially pot galvanize effect for high-intensity band steel is remarkable.
Be noted that above enumerate be merely specific embodiment of the present invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (10)
1. a band steel continuous hot galvanizing method is characterized in that, comprises the following steps:
(1) carries out preheating after the band steel cleans;
(2) adopt short flame will be with steel to be heated to 550～700 ℃ over against the mode that the band steel directly contacts;
(3) adopt the method for radiator tube heating to continue heating zone steel to 700～850 ℃;
(4) the band steel is carried out the gentle deepfreeze of soaking successively;
(5) adopting hydrogen volume content is that 5～70% nitrogen hydrogen mixeding gas will be with steel to be quickly cooled to 150～550 ℃;
(6) the band steel is heated once more, be heated to 450～550 ℃;
(7) the band steel is carried out the secondary soaking;
(8) the band steel being carried out pot galvanize handles.
2. band steel continuous hot galvanizing method as claimed in claim 1, it is characterized in that: the preheating temperature in the said step (1) is 200～350 ℃.
3. band steel continuous hot galvanizing method as claimed in claim 2 is characterized in that: the heating by the exhaust gases band steel that adopts short flame to be produced in the said step (1).
4. band steel continuous hot galvanizing method as claimed in claim 1, it is characterized in that: the short flame in the said step (2) is the short flame that combustion of natural gas produced.
5. band steel continuous hot galvanizing method as claimed in claim 1 is characterized in that: adopt the mode of radiator tube soaking that the band steel is carried out equal thermal treatment in the said step (4), adopt the mode of jet slow cooling that the band steel is carried out the slow cooling processing.
6. band steel continuous hot galvanizing method as claimed in claim 1 is characterized in that: speed of cooling is 50～150 ℃/s in the said step (5).
7. band steel continuous hot galvanizing method as claimed in claim 1 is characterized in that: the mode that adds the thermal recovery induction heating in the said step (6) once more.
8. band steel continuous hot galvanizing method as claimed in claim 1 is characterized in that: the temperature of secondary soaking is 430～500 ℃ in the said step (7).
9. band steel continuous hot galvanizing method as claimed in claim 1 is characterized in that: the zinc liquid temperature of pot galvanize is 445～465 ℃ in the said step (8).
10. like claim 1 or 9 described band steel continuous hot galvanizing methods, it is characterized in that: the aluminium that contains 0.15～0.30wt% in the said step (8) in the zinc liquid of pot galvanize.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101566624A CN102816986A (en) | 2011-06-10 | 2011-06-10 | Strip steel continuous hot galvanizing method |
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| CN2011101566624A CN102816986A (en) | 2011-06-10 | 2011-06-10 | Strip steel continuous hot galvanizing method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110079647A (en) * | 2019-06-20 | 2019-08-02 | 常熟科弘材料科技有限公司 | A kind of zincincation of thin gauge household electrical appliances DX51D galvanized sheet |
| CN111270297A (en) * | 2020-03-10 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing zinc or zinc particle defects of hot-dip galvanized sheet surface strip |
| CN111575451A (en) * | 2020-04-28 | 2020-08-25 | 江油市瑞隆精密材料有限公司 | Cold-rolled strip steel continuous annealing process with energy-saving effect |
| CN113046674A (en) * | 2021-03-31 | 2021-06-29 | 常熟科弘材料科技有限公司 | Preparation process of thin hot-dip galvanized steel plate and thin hot-dip galvanized steel plate |
| CN113699474A (en) * | 2021-08-30 | 2021-11-26 | 宝钢湛江钢铁有限公司 | Method for producing alloyed hot-dip galvanized GA product without bottom slag |
| CN114836603A (en) * | 2022-04-12 | 2022-08-02 | 江苏常宝普莱森钢管有限公司 | Surface quality adjusting process for bright heat treatment furnace |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2618308B2 (en) * | 1992-03-18 | 1997-06-11 | 新日本製鐵株式会社 | High Si content High tensile galvanized steel sheet |
| JP2648772B2 (en) * | 1992-03-12 | 1997-09-03 | 新日本製鐵株式会社 | High P content high tensile galvanized steel sheet |
| JP2006052445A (en) * | 2004-08-12 | 2006-02-23 | Nippon Steel Corp | Apparatus for manufacturing hot-dip galvanized high-tensile-strength steel sheet |
| CN101287854A (en) * | 2005-10-14 | 2008-10-15 | 新日本制铁株式会社 | Method of continous annealing/hot-dipping of steel sheet containing silicon and apparatus for continuous annealing/hot-dipping |
| CN101532118A (en) * | 2008-03-11 | 2009-09-16 | 宝山钢铁股份有限公司 | Device for hot-dip coating Al-Zn (aluminum-zincic) on super high-strength band steel and processing technology |
| WO2010119971A1 (en) * | 2009-04-13 | 2010-10-21 | Ｊｆｅスチール株式会社 | Cold-rolled steel sheet having excellent slow-aging property and high curability in baking, and method for producing same |
| CN102057062A (en) * | 2007-08-31 | 2011-05-11 | 西门子Vai金属科技有限公司 | Method for operating a continuous annealing or galvanisation line for a metal strip |
-
2011
- 2011-06-10 CN CN2011101566624A patent/CN102816986A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2648772B2 (en) * | 1992-03-12 | 1997-09-03 | 新日本製鐵株式会社 | High P content high tensile galvanized steel sheet |
| JP2618308B2 (en) * | 1992-03-18 | 1997-06-11 | 新日本製鐵株式会社 | High Si content High tensile galvanized steel sheet |
| JP2006052445A (en) * | 2004-08-12 | 2006-02-23 | Nippon Steel Corp | Apparatus for manufacturing hot-dip galvanized high-tensile-strength steel sheet |
| CN101287854A (en) * | 2005-10-14 | 2008-10-15 | 新日本制铁株式会社 | Method of continous annealing/hot-dipping of steel sheet containing silicon and apparatus for continuous annealing/hot-dipping |
| CN102057062A (en) * | 2007-08-31 | 2011-05-11 | 西门子Vai金属科技有限公司 | Method for operating a continuous annealing or galvanisation line for a metal strip |
| CN101532118A (en) * | 2008-03-11 | 2009-09-16 | 宝山钢铁股份有限公司 | Device for hot-dip coating Al-Zn (aluminum-zincic) on super high-strength band steel and processing technology |
| WO2010119971A1 (en) * | 2009-04-13 | 2010-10-21 | Ｊｆｅスチール株式会社 | Cold-rolled steel sheet having excellent slow-aging property and high curability in baking, and method for producing same |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110079647A (en) * | 2019-06-20 | 2019-08-02 | 常熟科弘材料科技有限公司 | A kind of zincincation of thin gauge household electrical appliances DX51D galvanized sheet |
| CN111270297A (en) * | 2020-03-10 | 2020-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing zinc or zinc particle defects of hot-dip galvanized sheet surface strip |
| CN111575451A (en) * | 2020-04-28 | 2020-08-25 | 江油市瑞隆精密材料有限公司 | Cold-rolled strip steel continuous annealing process with energy-saving effect |
| CN113046674A (en) * | 2021-03-31 | 2021-06-29 | 常熟科弘材料科技有限公司 | Preparation process of thin hot-dip galvanized steel plate and thin hot-dip galvanized steel plate |
| CN113699474A (en) * | 2021-08-30 | 2021-11-26 | 宝钢湛江钢铁有限公司 | Method for producing alloyed hot-dip galvanized GA product without bottom slag |
| CN114836603A (en) * | 2022-04-12 | 2022-08-02 | 江苏常宝普莱森钢管有限公司 | Surface quality adjusting process for bright heat treatment furnace |
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Application publication date: 20121212 |