CN112481484B - Dew point self-adaptive control method for hot-dip galvanized products with different alloy components - Google Patents
Dew point self-adaptive control method for hot-dip galvanized products with different alloy components Download PDFInfo
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- 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
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- 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
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- 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
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- 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
- C21D9/54—Furnaces for treating strips or wire
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- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
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Abstract
The invention discloses a dew point self-adaptive control method of hot-dip galvanized products with different alloy components.A dew point self-adaptive control system is provided with a plurality of humidifying points and a plurality of dew point meters in a heating area and a soaking area of a vertical continuous annealing furnace which are transparent in front and back; humidified N2The gas being N delivered by a pipeline2Respectively passing through a heatable tank filled with desalted water and provided with an atomizing device in the tank, humidifying N passing through the tank2Gas, then passing the N with moisture through a pipe2Introducing into the furnace body; the dew point meter detects dew point in the heating and soaking region of the annealing furnace, and feedback controls the humidified gas N led into the furnace2The amount of (c). By adopting the technical scheme, the furnace area dew point is optimized and controlled in a certain range in sections, and reasonable distribution of the furnace dew point is obtained; the method not only can inhibit external oxidation, but also can ensure that the surface can be fully reduced in a soaking section, the furnace roller nodulation is well controlled, the defect of pockmark is well eliminated, and an obvious control effect is obtained.
Description
Technical Field
The invention belongs to the technical field of metallurgical industrial production, relates to a manufacturing technology of galvanized products, and particularly relates to a dew point self-adaptive control method for producing hot-galvanized products with different alloy components by a front-back transparent vertical continuous annealing furnace.
Background
The dew point is a technical parameter reflecting the moisture content in the protective gas in the furnace, the reduction of the iron oxide on the surface of the strip steel is directly influenced by the height of the dew point, and the dew points of all sections of the furnace are related to the oxidation-reduction rate of the surface of the strip steel. During normal production, the change condition of the protective gas components in the furnace and the reduction state of the surface of the plate strip by hydrogen cannot be directly measured, the change condition in the furnace can be indirectly inferred through measurement and analysis of the dew point in the furnace, the reduction capability of the atmosphere in the furnace is indirectly displayed, and the abnormal dew point of the furnace can cause foreign matters to be adhered to a furnace roller to generate defects on the surface of the plate strip.
The alloy elements of Si, Mn, Cr, P, B and the like are common elements in the manufacturing process of galvanized products, and the alloy elements of the galvanized products rich in the alloy elements are easy to diffuse to the surface of the strip steel to be oxidized outside in the annealing process, so that SiO is formed on the surface of the strip steel2、MnO2、MnSiO3、Mn2SiO4And the like. The external oxidation product has stronger affinity and intersolubility with the furnace roller material, is easy to adhere to the roller surface and reacts with the body lining of the furnace roller to form accumulated lumps which are difficult to remove. Along with the continuous use of the furnace roller, the nodules are longer and larger on the roller surface, the protrusion height can reach 0.5mm, and serious pitting defects are generated on the surface of the strip steel under the high-temperature state in the furnace.
In the prior art, the conventional vertical continuous annealing furnace hearth design does not realize dew point sectional control according to different products and different furnace areas.
With the deepening of the understanding of the internal and external oxidation of the alloy elements in recent years, in order to effectively control the furnace roller nodulation and improve the surface quality of products, external oxidation during annealing of different alloy components in a hot-dip galvanized product substrate needs to be inhibited during actual production, and the sectional control of dew points according to different furnace regions needs to be realized according to different products theoretically, and the reasonable distribution of the dew points in the furnace is ensured.
Disclosure of Invention
The invention provides a dew point self-adaptive control method for hot-dip galvanized products with different alloy components, aiming at reducing the generation of oxides on the surface of a steel plate by alloy elements.
In order to achieve the purpose, the invention adopts the technical scheme that:
the dew point self-adaptive control method of the hot dip galvanizing product with different alloy components is applied to a dew point self-adaptive control system of a front and back transparent vertical continuous annealing furnace;
the dew point self-adaptive control system is provided with a plurality of humidifying points and a plurality of dew point meters in the heating area and the soaking area of the vertical continuous annealing furnace which are transparent in front and back;
at said humidification point, humidified N2The gas being N delivered by a pipeline2Respectively passing through a heatable tank filled with desalted water and provided with an atomizing device in the tank, humidifying N passing through the tank2Gas, then passing the N with moisture through a pipe2Introducing into the furnace body;
the dew point meter detects dew points in the heating and soaking areas of the annealing furnace, and feeds back and controls the humidifying gas N led into the furnace to the dew point adaptive control system2The amount of (c).
The number of the humidifying points is four, and the four humidifying points are respectively arranged in the front zone, the middle zone and the rear zone of the heating zone and the bottom two-layer platform zone of the soaking zone furnace.
The humidifying point is formed by opening a hole at a humidifying part determined by the furnace body and arranging a humidifying pipeline, and the distance between the orifice of the humidifying point and the inner wall of the furnace wall is 100-200 mm;
wet N humidified with desalted water2And the gas enters the furnace through the orifice of the humidifying point.
The number of the dew point meters is eight, and the detection value of the dew point meters reflects the actual dew point control condition of the section in the furnace;
four dew point devices are respectively arranged at the upper part and the lower part and are respectively arranged at the front, middle and rear zones of the heating zone and the top of the soaking zone furnace; the bottom two-layer platform corresponds to the downstream position of the humidifying openings, and each humidifying opening is correspondingly arranged;
the four dew point meters at the top are used for detecting the actual dew point value, and the four dew point meters at the bottom are used for detecting the actual dew point value and controlling the flow of the humidified gas in a feedback manner.
The dew point self-adaptive control method is characterized in that the dew points of the front, middle and rear zones and the soaking zone of the heating zone are self-adaptively adjusted, and after strip steel enters an annealing furnace, the atmosphere dew points are respectively increased to-10 to-35 ℃, 15 to-40 ℃, 25 to-45 ℃ and 35 to-50 ℃, so that the distribution of the gradually reduced dew points of the heating zone and the soaking zone is realized.
The dew point self-adaptive control method is divided into four types according to different types and contents of alloy elements contained in hot dip galvanized product substrates with different grades:
the steel is a low-C mild steel series from a CQ grade to an SEDDQ grade; secondly, low-C high-strength IF steel series rich in P, B; thirdly, common low-alloy high-strength steel series; fourthly, the high-strength steel series is rich in alloy elements such as Si, Mn, Cr and the like;
the dew points of the front zone, the middle zone, the rear zone and the soaking zone of the first type of heating zone are respectively as follows: minus 30 ℃ to minus 35 ℃, minus 30 ℃ to minus 40 ℃, minus 35 ℃ to minus 45 ℃, and minus 40 ℃ to minus 50 ℃;
the dew points of the front zone, the middle zone, the rear zone and the soaking zone of the heating section of the second type are respectively as follows: minus 20 ℃ to minus 30 ℃, minus 25 ℃ to minus 35 ℃, minus 30 ℃ to minus 40 ℃ and minus 40 ℃ to minus 50 ℃;
the third heating section comprises the following dew points: minus 20 ℃ to minus 30 ℃, minus 25 ℃ to minus 35 ℃, minus 30 ℃ to minus 40 ℃ and minus 40 ℃ to minus 50 ℃;
the fourth type heating section front, middle and rear zone and soaking section dew points are respectively as follows: minus 10 ℃ to minus 20 ℃, minus 15 ℃ to minus 25 ℃, minus 25 ℃ to minus 35 ℃ and minus 35 ℃ to minus 50 ℃.
According to the four categories, different control strategies are integrated in two-stage model control, and the dew point values of the front zone, the middle zone, the rear zone and the soaking zone of the heating zone are set to realize self-adaptive feedback dew point control.
The two-stage model control comprises first-stage control and second-stage control, wherein: the first-level control is PLC-level control and controls the actuating mechanism through logic; and the secondary control is that the control parameter value calculated by the model is downloaded to the PLC as a primary control instruction.
By adopting the technical scheme, the invention utilizes the principle of oxidation control of alloy elements, adds the humidifying device, optimizes the dew point feedback control point, optimizes and controls the furnace area dew point in a certain range in a sectional way, and obtains reasonable distribution of the furnace dew point; the alloy types and the content of products with different grades are made to meet the dew point control requirement, and the alloy types and the content are integrated in a secondary model to realize self-adaptive control; the distribution that the heating and soaking section dew point is gradually reduced is realized, the external oxidation inhibition effect is met, the surface can be fully reduced in the soaking section, the furnace roller nodulation is well controlled, the defect of pockmark is well eliminated, and the obvious control effect is obtained.
Drawings
FIG. 1 is a schematic diagram of the construction of a field-implemented humidification apparatus of the present invention;
FIG. 2 is a screenshot of a dew point feedback screen in the control system display of the present invention;
FIG. 3 is a screen shot of a dew point control curve of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
The invention relates to a dew point self-adaptive control method for hot-dip galvanized products with different alloy components, which is applied to a dew point self-adaptive control system of a front and back transparent vertical continuous annealing furnace.
In order to solve the problems in the prior art, overcome the defects and achieve the aim of reducing the generation of oxide on the surface of a steel plate by alloy elements, the invention adopts the following technical scheme:
as shown in fig. 1 to 3, the dew point adaptive control system of the invention is provided with a plurality of humidifying points and a plurality of dew point hygrometers in the heating area and the soaking area of the vertical continuous annealing furnace which are transparent front and back;
at said humidification point, humidified N2The gas being N delivered by a pipeline2Respectively passing through a heatable tank filled with desalted water and provided with an atomizing device in the tank, humidifying N passing through the tank2Gas, then passing the N with moisture through a pipe2Introducing into the furnace body;
the dew point meter detects dew points in the heating and soaking areas of the annealing furnace, and feeds back and controls the humidifying gas N led into the furnace to the dew point adaptive control system2The amount of (c).
As shown in fig. 1:
the number of the humidifying points is four, and the four humidifying points are respectively arranged in the front zone, the middle zone and the rear zone of the heating zone and the bottom two-layer platform zone of the soaking zone furnace.
The humidifying apparatus shown in fig. 1 (i.e., four barrel-shaped devices) has its humidifying position at the furnace racking position. The effect is N2The gas is passed through the interior of a heated desalted water tank and wet N is added2Gas, which carries moisture into the furnace.
The invention uses the principle of alloy element oxidation control, namely dew point control, and adds a set of dew point control device aiming at the conventional vertical continuous annealing furnace, wherein the dew point control device comprises a humidifying device and a dew point instrument, the dew point feedback control point is optimized, the reasonable distribution of the dew point in the furnace is realized, and the effective control is realized; and (3) formulating dew point control requirements of products with different grades (according to different alloy types and contents) and integrating the dew point control requirements into a secondary model to realize self-adaptive control. Therefore, in practical production, when the steel plate enters the heating section of the annealing furnace with higher dew point, the diffusion of the alloy elements to the surface of the strip steel is inhibited, so that the oxide of the alloy elements on the surface of the strip steel is less, and the direct contact of the oxide of the alloy elements and the furnace roller is reduced.
The dew point of the nitrogen-hydrogen main pipe is below 60 ℃ below zero; before the scheme of the invention is adopted, the dew point of each process section in the furnace area is between-50 ℃ and-60 ℃, and obviously, the dew point control is not an optimized state according to the internal oxidation control principle.
The inner body of the annealing furnace is N according to a certain proportion2And H2The mixed gas of (1). H2Mainly plays a role in reducing the surface of the strip steel. According to 2H2+O2＝2H2O reaction formula, oxygen partial pressure can pass through H2O and H2The appropriate partial pressure ratio (dew point) is controlled. The gas in the furnace is controlled by the oxygen partial pressureStrong and weak oxidizability. During the annealing process, the mass transfer speed of the alloy elements on the secondary surface (namely in a certain depth below the surface) of the strip steel to the surface is less than O2The mass transfer speed to the inside of the strip steel, and the oxidation reaction of the alloy elements occurs on the secondary surface of the strip steel. The stronger the gas oxidizability (the higher the dew point), the farther the part which is oxidized is from the surface of the strip steel, the greater the oxidation depth, and the enrichment and oxidation of the alloy elements on the surface are reduced.
Specific structure of the humidification point:
the humidifying point is formed by opening a hole at a humidifying part determined by the furnace body and arranging a humidifying pipeline, and the distance between the orifice of the humidifying point and the inner wall of the furnace wall is 100-200 mm;
effect of wet spots:
wet N humidified with desalted water2And the gas enters the furnace through the orifice of the humidifying point.
The dew point instrument setting scheme is as follows:
quantity: the number of the dew point meters is eight, and the detection value of the dew point meters reflects the actual dew point control condition of the section in the furnace;
position: four dew point devices are respectively arranged at the upper part and the lower part and are respectively arranged at the front, middle and rear zones of the heating zone and the top of the soaking zone furnace; the bottom two-layer platform corresponds to the downstream position of the humidifying openings, and each humidifying opening is correspondingly arranged;
the dew point meter has the following functions:
the four dew point meters at the top are used for detecting the actual dew point value, and the four dew point meters at the bottom are used for detecting the actual dew point value and controlling the flow of the humidified gas in a feedback manner.
Figure 3 reflects the time versus temperature recorded by the four dew point meters. Wherein the abscissa is time and the ordinate is temperature.
The dew point self-adaptive control method is characterized in that the dew points of the front, middle and rear zones and the soaking zone of the heating zone are self-adaptively adjusted, and after strip steel enters an annealing furnace, the atmosphere dew points are respectively increased to-10 to-35 ℃, 15 to-40 ℃, 25 to-45 ℃ and 35 to-50 ℃ to realize the distribution of gradually reduced dew points of the heating zone and the soaking zone.
By self-adaptively adjusting the dew points of the front zone, the middle zone, the rear zone and the soaking zone of the heating section, after strip steel enters an annealing furnace, the atmosphere dew point is increased to-10 to-35 ℃, to-15 to-40 ℃, to-25 to-45 ℃ and to-35 to-50 ℃, so that heating is realized, the distribution of gradually reduced dew points of the soaking zone meets the requirement of inhibiting external oxidation, the surface can be fully reduced at the soaking zone, the furnace roller nodulation is well controlled, the defect of a pockmark is well eliminated, and an obvious control effect is obtained.
The self-adaptive adjusting method comprises the following steps: different varieties of products have different requirements for dew point control. Setting the dew point control requirements of different product varieties on each area in a secondary model, calling the dew point control requirements as dew point set values when a system receives information for producing the product varieties, and feeding back and adjusting a humidifying device to change humidifying N2The flow and other parameters are controlled, and the self-adaptive adjustment of dew point control is realized.
The method comprises the following specific steps:
the dew point self-adaptive control method is divided into four types according to different types and contents of alloy elements contained in hot dip galvanized product substrates with different grades:
first, low C mild steel series from CQ grade to SEDDQ grade;
the second category, low C high strength IF steel series rich in P, B;
the third kind, common low alloy high strength steel series;
the fourth type is a high-strength steel series rich in Si, Mn, Cr and other alloy elements;
the dew points of the front zone, the middle zone, the rear zone and the soaking zone of the first type of heating zone are respectively as follows: minus 30 ℃ to minus 35 ℃, minus 30 ℃ to minus 40 ℃, minus 35 ℃ to minus 45 ℃, and minus 40 ℃ to minus 50 ℃;
the dew points of the front zone, the middle zone, the rear zone and the soaking zone of the heating section of the second type are respectively as follows: minus 20 ℃ to minus 30 ℃, minus 25 ℃ to minus 35 ℃, minus 30 ℃ to minus 40 ℃ and minus 40 ℃ to minus 50 ℃;
the third heating section comprises the following dew points: minus 20 ℃ to minus 30 ℃, minus 25 ℃ to minus 35 ℃, minus 30 ℃ to minus 40 ℃ and minus 40 ℃ to minus 50 ℃;
the fourth type heating section front, middle and rear zone and soaking section dew points are respectively as follows: minus 10 ℃ to minus 20 ℃, minus 15 ℃ to minus 25 ℃, minus 25 ℃ to minus 35 ℃ and minus 35 ℃ to minus 50 ℃.
According to the four categories, different control strategies are integrated in two-stage model control, and the dew point values of the front zone, the middle zone, the rear zone and the soaking zone of the heating zone are set to realize self-adaptive feedback dew point control.
The two-stage model control comprises first-stage control and second-stage control, wherein: the first-level control is PLC-level control and controls the actuating mechanism through logic; and the secondary control is that the control parameter value calculated by the model is downloaded to the PLC as a primary control instruction.
According to the four categories, different control strategies are integrated in two-stage model control according to the types and contents of different categories of alloy elements contained in different brands of products, and the dew point values of the front zone, the middle zone, the rear zone and the soaking zone of the heating zone are set to realize self-adaptive feedback dew point control.
The two-stage model control is a process-level control system of the production line, and comprises the steps of obtaining the temperatures of different annealing furnace areas required by the product through model calculation according to product attribute requirements of different product varieties, specifications, performances and the like, forming a temperature curve and the like. And controlling equipment such as a furnace and the like to operate as required according to control requirements such as a temperature curve and the like.
The device control is integrated in two-stage model control, and the dew point control requirements can be adaptively switched according to products with different contents of alloy elements. The dew point switching process is mainly characterized in that the internal oxidation depth is increased by improving the oxidizability in the atmosphere, and the generation of oxides of alloy elements on the surface of a steel plate is reduced.
Through the implementation of the invention, the influence of the permeable hearth on the dew point distribution in the process of strip steel running is fully considered, the feedback control point is reasonably set, and the furnace area dew point is optimized and controlled in a certain range in sections according to different product grades (the types and the contents of alloy elements).
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (5)
1. A dew point self-adaptive control method of hot dip galvanizing products with different alloy components is applied to a dew point self-adaptive control system of a front and back transparent vertical continuous annealing furnace; the dew point self-adaptive control system is provided with a plurality of humidifying points and a plurality of dew point meters in the heating area and the soaking area of the front and back transparent vertical continuous annealing furnace;
at said humidification point, humidified N2The gas being N delivered by a pipeline2Respectively passing through a heatable tank filled with desalted water and provided with an atomizing device in the tank, humidifying N passing through the tank2Gas, then passing the N with moisture through a pipe2Introducing into the furnace body;
the dew point meter detects dew points in the heating and soaking areas of the annealing furnace, and feeds back and controls the humidifying gas N led into the furnace to the dew point adaptive control system2The amount of (c);
the dew point self-adaptive control method is divided into four types according to different types and contents of alloy elements contained in hot dip galvanized product substrates with different grades:
the first type: low C mild steel series from CQ grade to SEDDQ grade;
the second type: p, B-enriched low-C high-strength IF steel series;
in the third category: common low alloy high strength steel series;
the fourth type: high-strength steel series rich in alloy elements Si, Mn and Cr;
integrating different control strategies into two-stage model control according to the four categories, and setting dew point values of a heating section front zone, a heating section middle zone, a heating section rear zone and a soaking section to realize self-adaptive feedback dew point control;
the dew points of the front zone, the middle zone, the rear zone and the soaking zone of the first type of heating zone are respectively as follows: minus 30 ℃ to minus 35 ℃, minus 30 ℃ to minus 40 ℃, minus 35 ℃ to minus 45 ℃, and minus 40 ℃ to minus 50 ℃;
the dew points of the front zone, the middle zone, the rear zone and the soaking zone of the heating section of the second type are respectively as follows: minus 20 ℃ to minus 30 ℃, minus 25 ℃ to minus 35 ℃, minus 30 ℃ to minus 40 ℃ and minus 40 ℃ to minus 50 ℃;
the third heating section comprises the following dew points: minus 20 ℃ to minus 30 ℃, minus 25 ℃ to minus 35 ℃, minus 30 ℃ to minus 40 ℃ and minus 40 ℃ to minus 50 ℃;
the fourth type heating section front, middle and rear zone and soaking section dew points are respectively as follows: minus 10 ℃ to minus 20 ℃, minus 15 ℃ to minus 25 ℃, minus 25 ℃ to minus 35 ℃ and minus 35 ℃ to minus 50 ℃.
2. The dew-point adaptive control method for hot-dip galvanized products with different alloy compositions according to claim 1, characterized in that: the number of the humidifying points is four, and the four humidifying points are respectively arranged in the front zone, the middle zone and the rear zone of the heating zone and the bottom two-layer platform zone of the soaking zone furnace.
3. The dew-point adaptive control method for hot-dip galvanized products with different alloy compositions according to claim 2, characterized in that:
the humidifying point is formed by opening a hole at a humidifying part determined by the furnace body and arranging a humidifying pipeline, and the distance between the orifice of the humidifying point and the inner wall of the furnace wall is 100-200 mm;
wet N humidified with desalted water2And the gas enters the furnace through the orifice of the humidifying point.
4. The dew-point adaptive control method for hot-dip galvanized products with different alloy compositions according to claim 2, characterized in that:
the number of the dew point meters is eight, and the detection value of the dew point meters reflects the actual dew point control condition of the area in the furnace;
four dew point devices are respectively arranged at the upper part and the lower part and are respectively arranged at the front, middle and rear zones of the heating zone and the top of the soaking zone furnace; the bottom two-layer platform corresponds to the downstream position of the humidifying openings, and each humidifying opening is correspondingly arranged;
the four dew point meters at the top are used for detecting the actual dew point value, and the four dew point meters at the bottom are used for detecting the actual dew point value and controlling the flow of the humidified gas in a feedback manner.
5. The dew-point adaptive control method for hot-dip galvanized products with different alloy compositions according to claim 1, characterized in that: the two-stage model control comprises first-stage control and second-stage control, wherein: the first-level control is PLC-level control and controls the actuating mechanism through logic; and the secondary control is that the control parameter value calculated by the model is downloaded to the PLC as a primary control instruction.
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| JPH10183257A (en) * | 1996-12-25 | 1998-07-14 | Nippon Steel Corp | Humidifying gas supply method and apparatus for continuous decarburization annealing furnace |
| CN105018714A (en) * | 2014-04-17 | 2015-11-04 | 宝山钢铁股份有限公司 | Method for humidifying atmosphere in continuous annealing furnace |
| CN107429374A (en) * | 2015-03-23 | 2017-12-01 | 杰富意钢铁株式会社 | The manufacture method of continuous hot-dipping galvanizing device and hot-dip galvanized steel sheet |
| CN106676251A (en) * | 2017-01-24 | 2017-05-17 | 唐山钢铁集团有限责任公司 | Device and method for preventing furnace roller nodulation in high-strength steel annealing process |
| JP2019147999A (en) * | 2018-02-28 | 2019-09-05 | Ｊｆｅスチール株式会社 | Steel sheet production equipment, steel sheet production method and dew point control method |
| CN208298048U (en) * | 2018-05-08 | 2018-12-28 | 北京绿建中科科技有限公司 | dew point control device |
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