47 results about "Hot-dip galvanization" patented technology

This utility model discloses a bearing ring for offshore wind power generation, relating to the field of wind power generation, comprising a lower bearing body and an upper bearing body. This utility model, through the arrangement of the lower bearing body, upper bearing body, and balls, connects the entire bearing ring via the lower and upper bearing bodies. This multi-layer assembly improves the overall strength of the bearing ring. Simultaneously, a sealing sleeve at the connection point protects the lower and upper bearing bodies, enhancing the sealing performance and strength of the bearing ring. The lower bearing body and anti-corrosion coating, applied to the surfaces of both the lower and upper bearing bodies with hot-dip galvanized coating, provide excellent corrosion and wear resistance, offering long-term effective protection for the bearing ring. Furthermore, the technology is mature and relatively low-cost, making it suitable for corrosion protection of offshore wind power bearing rings.

Provided are: a hot-dip galvanized sheet that has a TS of 1180 MPa or greater, is excellent in formability, peel strength of a corona bond, and delayed peeling resistance at welded portions, and with which a component can be manufactured with a high dimensional accuracy; and a method for manufacturing the same. A hot-dip galvanized steel sheet according to the present invention is characterized by including a base steel sheet and a hot-dip galvanized layer formed on a surface thereof, wherein: the base steel sheet has a prescribed component composition and a prescribed steel structure; the amount of C contained in the surface layer of the base steel sheet is 0.150% or less; the value obtained by dividing the amount of C contained in the surface layer of the base steel sheet by the amount of C contained in the base steel sheet as a whole is less than 0.85; the hydrogen content [H] (mass ppm) in steel of hydrogen having a binding energy between the base steel sheet and a hydrogen trap site of 10 to 100 kJ / mol is 0.30 mass ppm or less; and the average Vickers hardness of the surface layer of the base steel sheet is denoted by HvS and satisfies formula (1) below.　(1): [H] ≤ (480 - HvS) / 320

This invention provides an alloyed hot-dip galvanized steel sheet with a tensile strength of 590 MPa or higher, excellent ductility and microcrack resistance, comprising a steel plate and an alloyed hot-dip galvanized layer. The steel sheet has a carbon equivalent (Ceq) of 0.370 or higher and less than 0.520, and a total Nb and Ti content of 0.010 to 0.080% by mass. At one-quarter of the plate thickness, the martensite area fraction is 5 to 30%. From the surface of the steel sheet to a depth of 20 μm, the martensite area fraction is 5 to 30%, the original austenite grain size is 3.0 μm or less (martensite area fraction 50% or higher), and the total Nb and Ti content in precipitates smaller than 100 nm is 50 ppm by mass or more, while the total Nb and Ti content in precipitates larger than 100 nm is 350 ppm by mass or less. Within a range from the surface of the steel plate to a depth of 1 μm, the long sides of the Si and Mn oxides present at the grain boundaries are less than 200 nm.

This invention discloses an artificial intelligence-based hot-dip galvanized layer uniformity detection system, comprising: a hardware acquisition layer (101), a data processing layer (102), an intelligent analysis layer (103), and an evaluation output layer (104) arranged from top to bottom, interconnected via an industrial Ethernet network; the hardware acquisition layer consists of a vision acquisition module and a mechanical transmission unit, used to simultaneously acquire images of the galvanized layer surface and data on the thickness distribution of the galvanized layer surface; the data processing layer consists of a data preprocessing module, used to process the images of the galvanized layer surface and the data on the thickness distribution of the galvanized layer surface; the intelligent analysis layer consists of an AI algorithm processing module, used for galvanized layer region segmentation, multi-scale feature extraction, and uniformity difference identification, employing an improved U-Net++ algorithm and attention mechanism; the evaluation output layer consists of a quantitative evaluation module, a result output module, and a calibration module, used for uniformity quantitative evaluation, result display, and system accuracy calibration, respectively. A corresponding detection method is also disclosed.

Disclosed is a system (100) and a method (500) for hot dip galvanization using compressed biogas (CBG) as fuel for heating the zinc kettle maintained at 450 ± 10°C. The system (100) comprises a gas delivery module (200), an electronic monitoring and control module (300), and an ignition module (400) communicatively and operably connected. The gas delivery module (200) carries out a stagewise reduction in the CBG pressure. The electronic monitoring and control module (300) receives values from a plurality of sensors to provide a signal to a variable frequency drive (305) to adjust the pressure of air supplied by a combustion blower to achieve a predefined temperature of the zinc kettle. The system (100) and the method (500) reduce dependence on fossil fuels, minimizing the waste going to landfills, and improving real-time visibility of critical system parameters, facilitating better decision-making.

This invention relates to a method for anti-corrosion pretreatment of multiple components, including a hot-dip galvanized magnesium-plated steel surface, wherein each component sequentially passes through a degreasing stage, a conversion stage, and a painting stage. The conversion stage, based on an acidic aqueous conversion solution containing compounds of elements Zr and / or Ti dissolved in water, is adjusted in terms of pH and free fluoride content to produce a uniform conversion layer on the hot-dip galvanized magnesium-plated steel, reliably providing high paint film adhesion regardless of the degree of contamination during the degreasing stage.

This utility model discloses a hot-dip galvanizing device for steel structures, comprising a galvanizing tank, two first bases fixedly connected to both sides of the galvanizing tank, a sliding plate slidably connected to the upper end of each first base, a second motor fixedly connected to the upper end of the sliding plate, a hydraulic pump fixedly connected to the upper end of each second base, a third base fixedly connected to one side of a positioning frame, a second baffle fixedly connected to the other side of a sliding rod, a first slider threadedly connected to the lower end of a threaded rod, two first positioning grooves fixedly connected to the lower end of a first connecting plate, and support legs fixedly connected to the lower ends of the galvanizing tank and the pretreatment tank. Through this structure, a third cylinder drives the lower positioning plate to fix the steel structure. After fixing, the first cylinder automates the hot-dip galvanizing process of the steel structure, improving production efficiency. Rotating the steel structure ensures a uniform zinc coating on the surface, improving the quality of the galvanizing.

DEPCT65 What has been provided is a hot-dip galvanizing method that can inhibit the occurrence of... The dross defect and the facilitation of alloying are advantages when producing quenched steel plates. Hot-dip galvanizing is a process of zinc coating through alloying; it is a standard operating procedure for hot-dip galvanizing. This is an example of the hot-dip galvanizing process that has been used for manufacturing. Hot-dip galvanized steel sheet or hot-dip galvanized steel sheet through The alloying process in this hot-dip galvanizing operation includes the aggregation step. Example (S1) procedure for determining the amount of dross phase sine (S2) and adjustment procedure. Working condition (S3) in the sample collection step (S1), samples were collected from the bath. Hot-dip galvanizing with Al in the determination process to obtain dross sine (S2) content. The dross phase saturation in the collected samples was determined during the conditioning procedure. Working (S3) The working conditions of the hot-dip galvanizing operation are adjusted by Based on a defined dross phase quantity. -----------------------------------------------------------

A manufacturing method of a hot-dip galvanized steel sheet and a hot-dip galvanized steel sheet are provided, the method includes hot-rolling a slab to obtain a steel sheet, coiling the steel sheet, pickling and cold-rolling the steel sheet, performing continuous annealing by setting the annealing temperature at 840-870°C, setting the annealing dew point at -10-0°C, cooling to 710-730°C at a cooling rate of ≦10°C / s, further cooling to 220-320°C at a cooling rate of ≧50°C / s, reheating to 410-460°C, and maintaining the temperature for 20-100 s, and galvanizing the steel sheet to obtain a hot-dip galvanized steel sheet having a chemical element composition of C: 0.17-0.21wt%, Si: 1.2-1.7wt%, Al: 0.02-0.05%, Mn: 1.60-2.1wt%, N: ≦0.008wt%, and the balance being Fe and unavoidable impurities. The hot-dip galvanized steel sheet of the present invention has a yield strength of 400-600 MPa, a tensile strength of 730-900 MPa, an elongation of 25-35%, and a hole expansion ratio of 35-60%.

This utility model relates to a seamless steel pipe for ultra-low temperature alloy structures with rust-proof function, comprising a steel base pipe, an outer wall of which is provided with a corrosion-resistant layer, an outer layer of which is provided with a water-proof layer, and an outer layer of which is provided with a wear-resistant layer. This seamless steel pipe for ultra-low temperature alloy structures with rust-proof function comprises, from the inside out, a steel base pipe, a galvanized metal layer, a fiber reinforcement layer, a water-proof layer, and a wear-resistant layer. The galvanized metal layer is hot-dip galvanized and directly adheres to the surface of the steel base pipe, filling the microscopic defects of the matrix and making the pores smaller. The fiber reinforcement layer is a glass fiber braided layer, with the glass fiber braided layer interlaced at 45° and bonded to the galvanized metal layer with epoxy resin. The mesh skeleton is a nylon mesh, and the water-proof adhesive layer is a butyl rubber / polyurethane composite adhesive. The nylon mesh is embedded in the middle of the water-proof adhesive layer, which can enhance the shear deformation resistance of the water-proof layer.

The utility model relates to the technical field of steelwork production and processing, and disclose a kind of transmission tower steelwork hot-dip galvanizing automatic feeding equipment, including support plate subassembly, the middle installation of support plate subassembly has feeding conveying subassembly, and the outer wall fixed mounting of the beginning of support plate subassembly has adjusting brake subassembly, while the bottom fixed mounting of the end of support plate subassembly has angle adjusting subassembly, the front side of angle adjusting subassembly is correspondingly provided with balance bracket subassembly, and balance bracket subassembly is slidably installed at the bottom side of support plate subassembly.The utility model is equipped with height adjusting subassembly on device, can make when using this device, when the conveying work of different height processing device is carried out, corresponding height adjustment can be carried out by the height adjusting subassembly set, and then more extensive work application is realized.

This invention belongs to the field of metallurgical technology, and particularly relates to a method for preparing galvanized hot-formed steel with shot-blast-free performance. The method includes the following steps: S1, using a hot-rolled substrate as the raw material for galvanized hot-formed steel and heating it; S2, hot-dip galvanizing the heated hot-rolled substrate to form an Fe2Al5 inhibition layer with a thickness of not less than 300 nm between the zinc layer and the substrate, obtaining a galvanized steel sheet; S3, heating and holding the galvanized steel sheet, wherein the sheet thickness h, heating rate v, and holding time t satisfy a process window jointly defined by the shot-blast-free condition and the austenitization sufficiency condition, causing the Fe2Al5 inhibition layer to decompose and form a protective oxide layer on the steel sheet surface; S4, stamping and quenching. This invention effectively inhibits excessive ZnO oxidation during hot forming through the synergistic effect of the hot-rolled substrate and the coating inhibition layer, achieving shot-blast-free processing.

This utility model discloses a coastal reinforced angle steel corrosion-resistant tower, belonging to the technical field of angle steel towers. It includes an angle steel body, comprising a base steel, a galvanized layer on the surface of the base steel, and a corrosion-resistant structure on the surface of the galvanized layer. The corrosion-resistant structure includes a zinc-rich primer, a polyurethane topcoat sprayed onto the surface of the zinc-rich primer, and an epoxy powder coating on the surface of the polyurethane topcoat. Its beneficial effects are that by setting the galvanized layer, zinc-rich primer, polyurethane topcoat, and epoxy powder, and by hot-dip galvanizing the base steel to form the galvanized layer, and under the action of the zinc-rich primer, polyurethane topcoat, and epoxy powder, and by setting a polyethylene layer at the corners of the angle steel body, the corrosion resistance of the angle steel body is improved, thus improving the corrosion resistance of the angle steel tower. Furthermore, by fixing it to the ground with fixing bolts, and by fixing the reinforcing base to the tower body with reinforcing plates, the stability of the tower body is improved.

Provided is a hot-dip galvanized steel sheet having high strength, high ductility, high stretch flangeability and bendability, and reduced anisotropy of stretch flange fracture. The hot-dip galvanized steel sheet comprises: a base steel sheet; and a hot-dip galvanized layer formed on a surface thereof, wherein the base steel sheet includes: a predetermined chemical composition; and a microstructure at a position ¼ the sheet thickness from the surface of the base steel sheet in a depth direction in which an area ratio of martensite is 10% to 80%, an area ratio of ferrite is 20% to 90%, an area ratio of retained austenite is 10% or less, and a proportion of an area ratio of ferrite having {001} orientation to that of all ferrite is 0.50 or less, and a low-temperature-range diffusible hydrogen content in the base steel sheet is 0.015 mass ppm or less.

This invention belongs to the field of metallurgical technology, and particularly relates to a method for producing galvanized steel sheets with LME resistance. The method includes the following steps: S1, using hot-rolled steel sheets without cold rolling as raw materials, with the coiling temperature controlled at ≤600℃; S2, subjecting the hot-rolled steel sheets to low-temperature annealing, and controlling the annealing time according to the annealing temperature and sheet thickness; S3, hot-dip galvanizing the annealed steel sheets to obtain a galvanized substrate; S4, hot-stamping the galvanized substrate. This invention, through the control of hot-rolled raw materials, low-temperature short-time annealing, and annealing time, suppresses selective oxidation, promotes Fe-Zn alloying, forms an α-Fe(Zn) layer with a thickness ≥8μm, and controls the LME microcrack depth to ≤10μm. It requires no additional coating or complex processes and is suitable for direct hot-stamping production.

It is an object to provide a hot-dip galvanized steel sheet that has a high YR, exhibits high stretch flangeability immediately after production and high bendability immediately after production, and provides improved trimmed edge quality and to provide a method for producing the hot-dip galvanized steel sheet and a member. The hot-dip galvanized steel sheet includes: a base steel sheet; and a hot-dip galvanized layer on a surface of the base steel sheet. The base steel sheet has a prescribed chemical composition and has, at a position 1 / 4 of the thickness of the base steel sheet, a microstructure including martensite at an area fraction of 30% or more, ferrite at an area fraction of 70% or less, and retained austenite at a volume fraction of 20.0% or less. The amount of low-temperature diffusive hydrogen is 0.015 ppm by mass or less. Here, the amount of low-temperature diffusive hydrogen is an amount of hydrogen released from the base steel sheet when the base steel sheet is heated from room temperature to 50°C 24 hours after production of the hot-dip galvanized steel sheet. In the hot-dip galvanized layer, the number density of cracks penetrating through the hot-dip galvanized layer is 30 cracks / mm or more, and the full width at half maximum of the 51 phase in the hot-dip galvanized layer is 0.100 degrees or more.

The invention discloses a hot galvanizing method for an extra-high voltage transmission tower steel part, which belongs to the field of hot galvanizing and comprises the steps of hanging materials, pickling with hydrochloric acid to remove rust, cleaning with water, assisting in plating with a solvent, drying, purifying zinc liquid, hot-dip galvanizing and cooling, the zinc liquid purification step comprises slag removal pretreatment, zinc liquid temperature regulation and control, purification agent preparation, purification agent caging and liquid feeding, moving reaction for iron removal and scum removal, and the purification agent comprises industrial-grade metal aluminum wires and water-containing gas substances. The purifying agent is prepared from industrial-grade metal aluminum wires and water-containing gas production substances, wrapped by high-temperature-resistant glass wool cloth into a cluster, loaded into a cage frame made of titanium alloy round steel bars and reciprocatingly moved in the length direction of a zinc pot, so that iron-containing impurities in molten zinc fully react with the purifying agent in the cage frame, and a gray vermicular flocculent reaction product is generated; and then the dross is fished out, so that the purification of iron impurities in the zinc liquid is realized, the liquidity of the zinc liquid is improved, and the adhesive force of a zinc coating on a steel substrate is improved.

The utility model discloses a height -adjustable bicycle booster installation support relates to bicycle booster installation support technical field, including support main part and reinforced bearing mechanism, the reinforced bearing mechanism includes the triangular bearing truss of fixed connection in the inside position of support main part, and the outer fixed surface connection of triangular bearing truss reinforcing rib board, one side fixed connection of reinforcing rib board has reinforcing rib board, and one side fixed connection of reinforcing rib board has high temperature resistance alloy framework, the outer fixed surface connection of support main part has hot dip galvanizing bottom layer, and the outer fixed surface connection of hot dip galvanizing bottom layer has fluorocarbon varnish outer layer, this height -adjustable bicycle booster installation support compares with current ordinary use booster installation support, reduces support main part plastic deformation risk, weakens the risk of fracture, and the service life of support main part under the harsh environment is greatly promoted, and the abnormal sound and component wear and tear of eliminating because of resonance, promote support main part operating stability.

The steel sheet non-plating defect prediction method according to the present application is a steel sheet non-plating defect prediction method for a hot-dip galvanized steel sheet manufacturing apparatus provided with an annealing furnace and a plating device arranged on the downstream side of the annealing furnace, the steel sheet non-plating defect prediction method including a step of predicting non-plating defect information of a steel sheet on the exit side of the manufacturing apparatus using a non-plating defect prediction model learned through machine learning, the non-plating defect prediction model being learned using, as input data, one or two or more parameters selected from attribute information of a steel sheet charged into the manufacturing apparatus, one or two or more operation parameters selected from operation parameters of the annealing furnace, and one or two or more operation parameters selected from operation parameters of the plating device, and using non-plating defect information of a steel sheet on the exit side of the manufacturing apparatus as output data.

This invention relates to the field of alloy bracket materials technology, and discloses a photovoltaic bracket material resistant to damp heat corrosion and its preparation method, comprising the following steps: a steel coil is sequentially degreased with alkaline solution, pickled with hydrochloric acid, and finally rinsed with hot water and dried to obtain a clean steel coil; the clean steel coil is hot-rolled, cooled, and coiled to obtain a hot-rolled steel coil; the hot-rolled steel coil is immersed in a composite plating solution for continuous hot-dip galvanizing, cooled, and finished to obtain the photovoltaic bracket material. This method can form a damp heat corrosion resistant layer on the surface of the photovoltaic bracket material, and the damp heat corrosion resistant layer has extremely strong adhesion to the steel substrate, avoiding the problems of rust and coating peeling that easily occur during long-term service of the photovoltaic bracket material.

This invention belongs to the technical field of hot-dip galvanized aluminum-magnesium steel, and discloses a high corrosion-resistant and high-strength zinc-aluminum-magnesium coated steel sheet and its manufacturing method. The high corrosion-resistant and high-strength zinc-aluminum-magnesium coated steel sheet of this invention comprises a substrate and a zinc-aluminum-magnesium coating formed by hot-dip galvanizing aluminum-magnesium bath; wherein the chemical composition and mass percentage of the substrate are: C: 0.02-0.07%, Si: 0.02-0.10%, Mn: 0.7-0.9%, Als: 0.02-0.07%, P≤0.025%, S≤0.02%, with the balance being Fe and other unavoidable impurities; the chemical composition and mass percentage of the zinc-aluminum-magnesium bath are: Al: 30.0-45.0%, Mg: 5.0-8.0%, Si: 0.5-1.2%, with the balance being Zn and other unavoidable impurities. This invention achieves high strength and high corrosion resistance by adjusting the chemical composition of the zinc-aluminum-magnesium plating solution and optimizing the manufacturing process, without adding strengthening elements such as Nb and Ti to the substrate with low Si and low Mn content.

This utility model relates to the technical field of steel component manufacturing and processing, and discloses a cooling spray device for hot-dip galvanized steel components of power transmission towers. The device includes a coolant outlet assembly, a working plate assembly fixedly installed on the top of the coolant outlet assembly, a rotary brake assembly fixedly installed on one side of the top of the working plate assembly, and a height adjustment assembly fixedly installed on the braking side of the rotary brake assembly. By installing the rotary brake assembly on the device, this utility model allows for the installation of numerous parts around the rotary brake assembly, thereby improving cooling efficiency.

This utility model discloses a corrosion-resistant and cold-proof device for photovoltaic supports in high-altitude and cold-weather regions. It includes a stable base, a support frame assembly connected to the top of the stable base, an end frame assembly at the top of the support frame assembly, a side frame assembly inside the end frame assembly, and a reinforcing frame assembly at the bottom of the side frame assembly. The reinforcing frame assembly is composed of a main support body, an anti-corrosion layer, a hydrophobic layer, and an anti-UV layer. The anti-UV layer is made of fluorocarbon topcoat, the anti-corrosion layer is made of epoxy micaceous iron oxide intermediate paint, and a hydrophobic layer and an anti-UV layer are respectively provided on the outer wall of the anti-corrosion layer. The main support body is made of hot-dip galvanized steel. The end frame assembly includes the main support body, which has an internal chamber containing an electric heating tape. The outer wall of the main support body is provided with the anti-corrosion layer, the hydrophobic layer, and the anti-UV layer. This device prevents snow accumulation and corrosion, thereby extending its service life and reducing maintenance costs.

The utility model belongs to hot dip galvanizing zinc aluminum magnesium plate strip production equipment technical field, and disclose a kind of batch hot dip galvanizing zinc aluminum magnesium upwind mouth cooling device, including cooling box, air inlet, air outlet, shunt component, air inlet component and cooling spray head;Thickness detection sensor is linked with frequency converter and flow control valve, so that cooling device can automatically adjust cooling parameter according to the change of plate strip thickness, satisfy the cooling demand of different specifications plate strip, improve the versatility of equipment and the flexibility of production, cooling air passage design and adjustable cooling parameter, can quickly take away the heat of plate strip, shorten cooling time, improve production efficiency, through the unique design of shunt component, cooling wind is evenly distributed in cooling box, combined with cooling spray head that spacing is arranged along plate strip conveying direction and liquid supply volume can be independently adjusted, can guarantee that each part of plate strip can be evenly cooled, effectively improve the flatness and surface quality of plate strip.

The application provides a hot-dip galvanizing method and a hot-dip galvanizing steel plate, and the hot-dip galvanizing method comprises the following steps: sequentially performing pickling, water washing and plating-aiding treatment on a substrate to obtain a to-be-plated substrate; immersing the to-be-plated substrate into a first hot-dip galvanizing treatment solution to perform pre-plating treatment, and obtaining a pre-plated part; immersing the pre-plated part into a second hot-dip galvanizing treatment solution to perform main plating treatment, and obtaining a plated part; and immersing the plated part into a passivation solution to perform passivation treatment, and the process is completed. Through the pre-plating-main plating two-step treatment, the pre-plating is performed by immersing into a zinc solution containing aluminum elements, and the main plating is performed by immersing into a zinc solution containing aluminum elements and cerium elements, and through optimization of the components of the plating-aiding solution and the passivation solution, the uniformity, adhesion and corrosion resistance of the plated layer are enhanced.

The utility model relates to building material technical field discloses a high -strength I -type steel grating, including outer frame and flat steel, the outer wall of flat steel is connected with hot dip galvanizing layer fixedly, the outer wall of hot dip galvanizing layer is connected with electroplated zinc layer fixedly, the outer wall left and right sides of electroplated zinc layer all are connected with a plurality of horizontal reinforcing rib fixedly, the outer wall of a plurality of horizontal reinforcing rib all are connected with a plurality of longitudinal reinforcing rib fixedly, the outer wall of flat steel is set up with a plurality of weight -reducing holes, the outside of a plurality of weight -reducing holes all are connected with hole rib fixedly, the inner wall of a plurality of flat steels all are connected with a plurality of twisted square steel fixedly. In the utility model, through the synergies of the hot dip galvanizing layer and electroplated zinc layer of flat steel outer wall, the anticorrosion performance is enhanced, the horizontal reinforcing rib enhances the flat steel horizontal bending -resistance, and the longitudinal reinforcing rib forms the grid and promotes the overall strength, and the weight -reducing hole reduces the weight, and the hole rib makes up the punching intensity loss, reduces the cost while being convenient for carrying installation.

The application provides a preparation method of an acid-free and galvanization-free weather-resistant polyester coating guardrail, and the production process route is as follows: steel member forming, shot blasting, surface spraying and solidification, cooling, inspection and packaging; the production process does not need acid pickling and hot-dip galvanization. The process route of the steel member forming is as follows: blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, LF molten steel refining treatment and slab continuous casting and hot rolling. Through reasonable design of weather-resistant elements, the acid-free and galvanization-free weather-resistant plastic spraying guardrail is realized, shot blasting is used to replace acid pickling, acid-free production is realized, pollution and production cost are greatly reduced, and the processing cycle is shortened.

DEPCT65 What has been provided is a hot-dip galvanizing procedure that can achieve the desired level of durability. The concentrated Al in the hot-dip galvanizing bath provides a stable plating process. This type of hot-dip galvanizing is the hot-dip galvanizing process that is used. For the production of hot-dip galvanized steel sheets or coated steel sheets. Hot-dip galvanizing through alloying is a galvanizing process that includes: The sampling procedure (S1), the dross determination procedure (S2), and the procedure for Adjust the operating conditions (S3) in the sample collection step (S1). Samples were collected from Bath. Hot-dip galvanizing with Al in the determination process results in a dross content (S2). The gamma 2 dross phase and delta 1 dross phase content in the hot-dip galvanizing bath are obtained. Determined by using the examples collected in the operating condition adjustment step (S3). The operating conditions of the hot-dip galvanizing operation were adjusted based on... The specified gamma-2 dross phase and delta-1 dross phase amounts. -----------------------------------------------------------