CN108480417B - Method for producing 600g zinc layer non-spangle hot galvanized plate based on thin slab continuous casting and rolling hot base raw material and acid plating continuous production line - Google Patents

Method for producing 600g zinc layer non-spangle hot galvanized plate based on thin slab continuous casting and rolling hot base raw material and acid plating continuous production line Download PDF

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CN108480417B
CN108480417B CN201810102736.8A CN201810102736A CN108480417B CN 108480417 B CN108480417 B CN 108480417B CN 201810102736 A CN201810102736 A CN 201810102736A CN 108480417 B CN108480417 B CN 108480417B
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hot
strip steel
rolling
roller
continuous casting
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CN108480417A (en
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王慧凯
尹怡奎
王学伦
张波
郑志刚
周城
连晓磊
郭久明
徐帅
汲广桥
生西鹏
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Rizhao Baohua New Material Co Ltd
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Rizhao Baohua New Material Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Coating With Molten Metal (AREA)
  • Metal Rolling (AREA)

Abstract

A method for producing 600g of hot-galvanized sheet without spangles on a zinc layer based on a thin slab continuous casting and rolling hot-base raw material and an acid plating continuous production line. The invention belongs to the technical field of steel, and relates to a full headless thin slab continuous casting and rolling hot-base raw material and a method for producing 600g zinc layer hot-galvanized plates by an acid plating continuous production line, which comprises the following process steps: the raw material coil is produced by a continuous casting and rolling process of a full endless thin slab, and then is subjected to acid pickling, leveling, heating, galvanizing, finishing, passivating and coiling by an acid plating continuous production line to form the hot galvanized coil. The method can stably produce the hot-dip galvanized sheet with the zinc layer of 600g in the specification of 2.0-3.0mm 1500m, has good surface quality, high dimensional precision and stable performance, and can simultaneously replace the traditional cold-based and hot-based products.

Description

Method for producing 600g zinc layer non-spangle hot galvanized plate based on thin slab continuous casting and rolling hot base raw material and acid plating continuous production line
Technical Field
The invention belongs to the technical field of steel, and relates to a full headless thin slab continuous casting and rolling hot-base raw material and a method for producing 600g zinc layer hot-galvanized plates by an acid plating continuous production line.
Background
Due to the particularity of geology in western regions, the requirement on the corrosion resistance of materials in the infrastructure is high. The hot galvanizing is the most common, most economical and most effective anti-corrosion method, the continuous hot galvanizing has the advantages of low production cost, excellent coating performance, long service life and the like, and the hot galvanized plate is widely used in the construction industry and accounts for 13 to 35 percent of the steel plate.
However, the production technology of 600g of galvanized sheet without spangles in domestic hot galvanizing is relatively backward and can not meet the requirements of various industries, particularly the construction industry, so that the research of a production technology of 600g of galvanized sheet without spangles with an ultrahigh zinc layer is urgently needed.
Disclosure of Invention
A process method for producing 600g of hot-galvanized sheet without spangles on a zinc layer by a sheet continuous casting and rolling hot-base raw material and an acid pickling and galvanizing continuous production line comprises the following process steps: the raw material coil is produced through a continuous casting and rolling process of a full endless thin slab, and then is subjected to acid pickling, leveling, heating, galvanizing, finishing, passivating and coiling through an acid plating continuous production line to form a hot galvanized coil, wherein the specification of the hot galvanized coil is 2.0-3.0mm x 1500 mm.
The raw material coil comprises a foreign trade SPHC same-strength grade steel grade and an internal trade cold forming series steel grade, wherein the foreign trade SPHC same-strength grade steel grade comprises the following components in parts by weight: less than or equal to 0.06 part of C, less than or equal to 0.034 part of Si, 0.08-0.20 part of Mn0.017 part of P, less than or equal to 0.006 part of S, 0.015-0.050 part of Alt and 0.0009-0.0025 part of B; the steel grade of the domestic trade cold forming series comprises the following components in parts by weight: less than or equal to 0.06 part of C, less than or equal to 0.044 part of Si, 0.08-0.20 part of Mn0.017 part of P, less than or equal to 0.006 part of S and Alt
0.015-0.050 part.
Preferably, the continuous casting and rolling process of the full endless thin slab is as follows: the continuous casting billet produced by the continuous casting machine directly enters a large-reduction rolling mill to be rolled into an intermediate billet with the thickness of 8-20mm, the intermediate billet is heated to the temperature of 1100-1200 ℃ by an induction heating furnace and then enters 5 frames for finish rolling, and the coiled billet is coiled after laminar cooling.
Preferably, the acid washing process is as follows: the raw material enters a phosphorus breaker to be treated → acid cleaning → rinsing → drying.
Preferably, the flattening process is as follows: the leveling process adopts a double-leveling setting, the leveling elongation rate in the front of the furnace is 0.8-1.5%, the leveling elongation rate in the back of the furnace is 1.0-1.5%, the leveling machine is dry and smooth, and in order to ensure the surface quality of the strip steel, the brush roll device is installed behind the leveling machine, and the felt, the type of the leveling machine, is increased in the front of the furnace: dry temper mill/four roll, work roll diameter: 400-450mm, length of working roll: 1900mm, support roll diameter: 1050-: 1900mm, speed: 30-170m/min, deceleration acceleration: 0.7m/s2, rolling force: 1500-12000kN and 0.3-3.0 percent of elongation.
The leveling machine has the following functions:
(1) the mechanical property of the strip steel is improved, and the plastic deformation range of the strip steel is expanded;
(2) the yield platform is eliminated, and the tensile strain marks are prevented from appearing in the process of stamping the strip steel.
(3) The different roughness of the working roll surface of the planisher can make the strip steel have bright or rough surface.
(4) The strip shape of the strip steel is improved.
(5) Under large rolling reduction, the thickness of the strip steel is thinned.
Preferably, the heating process is as follows: the method comprises the following steps that strip steel enters an inlet sealing roller → an induction heater is used for heating, the temperature of a plate is 480-550 ℃ → the heat preservation of an electric radiation pipe heat preservation section → a steering tower top roller → a circulating jet cooling section → a hot tensioning roller chamber → a furnace nose → a zinc pot; the inlet sealing roller is used for ensuring the air tightness of the heating furnace, and a wear-resistant ceramic fiber plate is arranged on a furnace shell steel structure; a nitrogen curtain seal is arranged between the two pairs of seal rollers; the induction heater mainly comprises an induction coil, a shell, a heat insulation material, a water cooling unit and the like; the roller bearing at the top of the steering tower is a self-aligning roller bearing, the transmission side of the bearing is fixed, the floating of the operation side compensates thermal expansion, and the bearing seat is provided with a water cooling sleeve; expansion joints are arranged between the furnace shells at the two sides and the bearing seats to compensate longitudinal/transverse vibration; the circulating jet cooling section is used for cooling the strip steel to a temperature suitable for galvanizing and comprises a spray box, a centrifugal circulating fan and a heat exchanger, and the air quantity is automatically adjusted according to the strip steel temperature measured by an outlet pyrometer; the hot tensioning roller chamber is used for separating the tension of the steel strip in the furnace or outside the furnace to ensure the quality of a coating; the furnace nose is telescopic, a wet protection zinc ash prevention device is arranged, and a pneumatic baffle is used for maintaining the furnace pressure during maintenance.
Preferably, the galvanizing process is as follows: the method comprises the steps that strip steel is immersed into aluminum-containing zinc liquid from a furnace nose through a zinc pot sink roller → an air knife scrapes off the redundant zinc liquid on the surface of the strip steel, so that the purpose of controlling the thickness of a coating is achieved → a cooling fan cools → the strip steel enters a water quenching tank → a zinc layer thickness gauge is used for measuring the thickness, the pressure of the air knife is 43-50 mbar, the height is 140-230 mm, the distance is 15-18 mm, and the aluminum content of the zinc liquid is 0.27-0.3%.
Preferably, the finishing process refers to: four-roller burnishing → burnishing liquid spray cleaning → wringing roller wringing → edge purging, wherein the burnishing machine is a four-roller type, and is driven by a support roller, controlled by hydraulic rolling force, automatically pressed down and controlled by a positive roller and a negative roller.
The polishing machine has the following effects on the galvanized sheet: the front tension roller and the rear tension roller enable the galvanized sheet to generate larger tension, meanwhile, the upper working roller and the lower working roller of the finisher apply rolling force to the galvanized sheet, and the galvanized sheet generates plastic extension under the combined action of tensile stress and rolling force (compressive stress). The galvanized sheet has a great effect on surface quality improvement and performance improvement after finishing.
Preferably, the passivation process refers to: and (3) after the strip steel is taken out of the withdrawal and straightening machine, the strip steel enters a horizontal passivation machine, a layer of passivation solution is coated on the surface of the strip steel, then the strip steel is dried by a steam heat exchanger to solidify the passivation solution film (60-90 ℃), and then the strip steel enters a water cooling roller to cool the strip steel to below 50 ℃.
Preferably, the coiling process to form the hot-dip galvanized coil is as follows: the process for coiling the hot dip galvanized coil comprises the following steps: the recoiling machine recoils the finished product roll → the coil discharging trolley performs coil discharging → the finished product roll is transferred to the transport trolley by the coil discharging trolley → the coil transporting trolley transfers the finished product roll to the weighing saddle for weighing and bundling → is transferred to the finished product warehouse.
The outlet coiling machine consists of a winding drum, an outer support, a belt coiling aid and a guide plate platform, wherein the expansion and contraction of the winding drum controls the inner diameter and the outer diameter of a steel coil, the outer support is used for supporting the weight brought by the steel coil during coiling, and the belt coiling aid is used for helping the head of the strip to be smoothly coiled. The two sets of coiling machines are provided with a strip steel edge automatic control device and a width measuring device, and after the outer supporting bearing is drawn out, the coil unloading trolley unloads the steel coil from the mandrel and puts the steel coil on the steel coil beam. While the first coiler is running, the second coiler is ready for coiling and threading. The steel coil is conveyed to an outlet walking beam by a coil unloading trolley and a conveying trolley, and a weighing device and a bundling device are arranged on the walking beam.
The invention has the advantages of
(1) The invention provides a brand new method for producing a 600g ultrahigh zinc layer hot-dip galvanized sheet without spangles based on a sheet billet continuous casting and rolling hot-base raw material and an acid plating continuous production line, which can stably produce a 600g zinc layer hot-dip galvanized sheet with the specification of 2.0-3.0mm x 1500m, has good surface quality, high dimensional precision and stable performance, and can simultaneously replace the traditional cold-base and hot-base products.
(2) Compared with the traditional cold-base galvanizing production process, the continuous pickling galvanizing production process omits the processes of rolling thin materials by a rolling mill, secondary welding, degreasing, annealing and heating, saves energy, reduces cost, reduces the cost of about 600 yuan per ton of steel, and has considerable social and economic benefits.
(3) The production process of the invention also has the following advantages: high pulling speed and high yield; pressing down the liquid core; high-temperature rough rolling and special temperature distribution of casting blanks; electromagnetic induction heating is adopted, and the temperature of the strip blank is flexibly adjusted; the full endless rolling is realized, and a slab heating furnace is not arranged in the middle; the ultra-thin wide strip steel is economically produced; the rolling line length is short, and the investment is low; can produce high-quality hot-rolled steel coils with uniform structure performance; low energy consumption, low emission and environmental protection.
Drawings
FIG. 1 is a photograph of the surface of a product according to example 1 of the present invention;
FIG. 2 is a photograph of the surface of a product described in example 2 of the present invention.
Detailed Description
Example 1
A process method for producing 600g of hot-galvanized sheet without spangles on a zinc layer by a sheet continuous casting and rolling hot-base raw material and an acid pickling and galvanizing continuous production line comprises the following process steps: the raw material coil is produced by a continuous casting and rolling process of a full endless thin slab, and then is subjected to acid pickling, leveling, heating, galvanizing, finishing, passivating and coiling by an acid plating continuous production line to form a hot galvanized coil, wherein the specification of the hot galvanized coil is 2.0mm x 1500mm, and the steel grade is DX51D + Z.
Preferably, the continuous casting and rolling process of the full endless thin slab is as follows: the continuous casting billet produced by the continuous casting machine directly enters a large-reduction rolling mill, is rolled to an 8mm intermediate billet, is heated to 1100 ℃ by an induction heating furnace and then enters 5 frames of finish rolling, and is coiled after laminar cooling.
Preferably, the acid washing process is as follows: the raw material enters a phosphorus breaker to be treated → acid cleaning → rinsing → drying.
Preferably, the flattening process is as follows: the leveling process adopts a double-leveling setting, the leveling elongation rate in the front of the furnace is 0.8-1.5%, the leveling elongation rate in the back of the furnace is 1.0-1.5%, the leveling machine is dry and smooth, and in order to ensure the surface quality of the strip steel, the brush roll device is installed behind the leveling machine, and the felt, the type of the leveling machine, is increased in the front of the furnace: dry temper mill/four roll, work roll diameter: 400-450mm, length of working roll: 1900mm, support roll diameter: 1050-: 1900mm, speed: 30m/min, deceleration acceleration: 0.7m/s2, rolling force: 1500kN, elongation 0.3%.
Preferably, the heating process is as follows: the strip steel enters an inlet sealing roller → an induction heater is used for heating, the plate temperature is 480 ℃ → the heat preservation section of an electric radiant tube is used for preserving heat → a steering tower top roller → a circulating jet cooling section → a hot tensioning roller chamber → a furnace nose → a zinc pot.
Preferably, the galvanizing process is as follows: the strip steel is immersed into the aluminum-containing zinc liquid from the furnace nose through a zinc pot sink roll → the air knife scrapes off the redundant zinc liquid on the surface of the strip steel, thereby achieving the purpose of controlling the thickness of a coating layer → a cooling fan cools → the strip steel enters a water quenching tank → a zinc layer thickness gauge measures the thickness, the pressure of the air knife is 43mbar, the height is 140mm, the distance is 15mm, and the aluminum content of the zinc liquid is 0.27%.
Preferably, the finishing process refers to: four-roller burnishing → burnishing liquid spray cleaning → wringing roller wringing → edge purging, wherein the burnishing machine is a four-roller type, and is driven by a support roller, controlled by hydraulic rolling force, automatically pressed down and controlled by a positive roller and a negative roller.
Preferably, the passivation process refers to: the strip steel is taken out of the withdrawal and straightening machine and then enters a horizontal passivation machine, a layer of passivation solution is coated on the surface of the strip steel, then the strip steel is dried by a steam heat exchanger at the temperature of 60 ℃ to solidify the passivation solution film, and then the strip steel enters a water cooling roller to cool the strip steel to the temperature below 50 ℃.
Preferably, the coiling process to form the hot-dip galvanized coil is as follows: the process for coiling the hot dip galvanized coil comprises the following steps: the recoiling machine recoils the finished product roll → the coil discharging trolley performs coil discharging → the finished product roll is transferred to the transport trolley by the coil discharging trolley → the coil transporting trolley transfers the finished product roll to the weighing saddle for weighing and bundling → is transferred to the finished product warehouse.
Example 2
A process method for producing 600g of hot-galvanized sheet without spangles on a zinc layer by a sheet continuous casting and rolling hot-base raw material and an acid pickling and galvanizing continuous production line comprises the following process steps: the raw material coil is produced by a continuous casting and rolling process of a full endless thin slab, and then is subjected to acid pickling, leveling, heating, galvanizing, finishing, passivating and coiling by an acid plating continuous production line to form a hot galvanized coil, wherein the specification of the product is 2.0mm x 1500mm, and the steel grade is SGHC.
Preferably, the continuous casting and rolling process of the full endless thin slab is as follows: the continuous casting billet produced by the continuous casting machine directly enters a large-reduction rolling mill, is rolled to a 20mm intermediate billet, is heated to 1200 ℃ by an induction heating furnace and then enters 5 frames of finish rolling, and is coiled after laminar cooling.
Preferably, the acid washing process is as follows: the raw material enters a phosphorus breaker to be treated → acid cleaning → rinsing → drying.
Preferably, the flattening process is as follows: the leveling process adopts double leveling setting, the elongation rate is leveled in the front of the furnace is 1.5%, the elongation rate is leveled in the back of the furnace is 1.0%, the leveling machine is dry and smooth, and in order to ensure the surface quality of the strip steel, the brush roll device is installed behind the leveling machine, the felt is added in the front of the furnace, and the type of the leveling machine is as follows: dry temper mill/four roll, work roll diameter: 400-450mm, length of working roll: 1900mm, support roll diameter: 1050-: 1900mm, speed: 170m/min, deceleration acceleration: 0.7m/s2The rolling force is as follows: 12000kN, and 3.0% elongation.
Preferably, the heating process is as follows: the strip steel enters an inlet sealing roller → an induction heater is used for heating, the plate temperature is 550 ℃ → the heat preservation section of an electric radiant tube is used for preserving heat → a steering tower top roller → a circulating jet cooling section → a hot tensioning roller chamber → a furnace nose → a zinc pot.
Preferably, the galvanizing process is as follows: the strip steel is immersed into aluminum-containing zinc liquid from a furnace nose through a zinc pot sink roller → the air knife scrapes off the redundant zinc liquid on the surface of the strip steel, thereby achieving the purpose of controlling the thickness of a coating layer → a cooling fan cools → the strip steel enters a water quenching tank → a zinc layer thickness gauge measures the thickness, the air knife has the pressure of 50mbar, the height of 230mm, the distance of 18mm and the aluminum content of the zinc liquid of 0.3 percent.
Preferably, the finishing process refers to: four-roller burnishing → burnishing liquid spray cleaning → wringing roller wringing → edge purging, wherein the burnishing machine is a four-roller type, and is driven by a support roller, controlled by hydraulic rolling force, automatically pressed down and controlled by a positive roller and a negative roller.
Preferably, the passivation process refers to: the strip steel is taken out of the withdrawal and straightening machine and then enters a horizontal passivation machine, a layer of passivation solution is coated on the surface of the strip steel, then the strip steel is dried by a steam heat exchanger at the temperature of 90 ℃ to solidify the passivation solution film, and then the strip steel enters a water cooling roller to cool the strip steel to below 50 ℃.
Preferably, the coiling process to form the hot-dip galvanized coil is as follows: the process for coiling the hot dip galvanized coil comprises the following steps: the recoiling machine recoils the finished product roll → the coil discharging trolley performs coil discharging → the finished product roll is transferred to the transport trolley by the coil discharging trolley → the coil transporting trolley transfers the finished product roll to the weighing saddle for weighing and bundling → is transferred to the finished product warehouse.
Example 3
A process method for producing 600g of hot-galvanized sheet without spangles on a zinc layer by a sheet continuous casting and rolling hot-base raw material and an acid pickling and galvanizing continuous production line comprises the following process steps: the raw material coil is produced by a continuous casting and rolling process of a full endless thin slab, and then is subjected to acid pickling, leveling, heating, galvanizing, finishing, passivating and coiling by an acid plating continuous production line to form a hot galvanized coil, wherein the specification of the product is 3.0mm x 1500mm, and the steel grade is S350GD + Z.
Preferably, the continuous casting and rolling process of the full endless thin slab is as follows: the continuous casting billet produced by the continuous casting machine directly enters a large-reduction rolling mill, is rolled to a 15mm intermediate billet, is heated to 1150 ℃ by an induction heating furnace and then enters 5 frames of finish rolling, and is coiled after laminar cooling.
Preferably, the acid washing process is as follows: the raw material enters a phosphorus breaker to be treated → acid cleaning → rinsing → drying.
Preferably, the flattening process is as follows: the leveling process adopts a double leveling setting, wherein the elongation rate of the leveling machine is 0.8% in front of the furnace, the elongation rate of the leveling machine is 1.0% in back of the furnace, the leveling machine is dry and flat, and in order to ensure the surface quality of strip steel, the brush roll device is installed behind the leveling machine, the felt is added in front of the furnace, and the type of the leveling machine is as follows: dry temper mill/four roll, work roll diameter: 400-450mm, length of working roll: 1900mm, support roll diameter: 1050-: 1900mm, speed: 80m/min, deceleration acceleration: 0.7m/s2The rolling force is as follows: 8000kN, and an elongation of 1.0%.
Preferably, the heating process is as follows: the strip steel enters an inlet sealing roller → an induction heater is used for heating, the plate temperature is 500 ℃ → the heat preservation section of an electric radiant tube is used for preserving heat → a steering tower top roller → a circulating jet cooling section → a hot tensioning roller chamber → a furnace nose → a zinc pot.
Preferably, the galvanizing process is as follows: the strip steel is immersed into aluminum-containing zinc liquid from a furnace nose through a zinc pot sink roll → the air knife scrapes off the redundant zinc liquid on the surface of the strip steel, thereby achieving the purpose of controlling the thickness of a coating layer → a cooling fan cools → the strip steel enters a water quenching tank → a zinc layer thickness gauge measures the thickness, the air knife has the pressure of 48mbar, the height of 150mm, the distance of 16mm and the aluminum content of the zinc liquid of 0.28 percent.
Preferably, the finishing process refers to: four-roller burnishing → burnishing liquid spray cleaning → wringing roller wringing → edge purging, wherein the burnishing machine is a four-roller type, and is driven by a support roller, controlled by hydraulic rolling force, automatically pressed down and controlled by a positive roller and a negative roller.
Preferably, the passivation process refers to: the strip steel is taken out of the withdrawal and straightening machine and then enters a horizontal passivation machine, a layer of passivation solution is coated on the surface of the strip steel, then the strip steel is dried by a steam heat exchanger at the temperature of 80 ℃ to solidify the passivation solution film, and then the strip steel enters a water cooling roller to cool the strip steel to below 50 ℃.
Preferably, the coiling process to form the hot-dip galvanized coil is as follows: the process for coiling the hot dip galvanized coil comprises the following steps: the recoiling machine recoils the finished product roll → the coil discharging trolley performs coil discharging → the finished product roll is transferred to the transport trolley by the coil discharging trolley → the coil transporting trolley transfers the finished product roll to the weighing saddle for weighing and bundling → is transferred to the finished product warehouse.
Example 4
A process method for producing 600g of hot-galvanized sheet without spangles on a zinc layer by a sheet continuous casting and rolling hot-base raw material and an acid pickling and galvanizing continuous production line comprises the following process steps: the raw material coil is produced by a continuous casting and rolling process of a full endless thin slab, and then is subjected to acid pickling, leveling, heating, galvanizing, finishing, passivating and coiling by an acid plating continuous production line to form a hot galvanized coil, wherein the specification of the product is 2.0mm x 1500mm, and the steel grade is SGH 340.
Preferably, the continuous casting and rolling process of the full endless thin slab is as follows: the continuous casting billet produced by the continuous casting machine directly enters a large-reduction rolling mill, is rolled to a 10mm intermediate billet, is heated to 1100 ℃ by an induction heating furnace and then enters 5 frames of finish rolling, and is coiled after laminar cooling.
Preferably, the acid washing process is as follows: the raw material enters a phosphorus breaker to be treated → acid cleaning → rinsing → drying.
Preferably, the flattening process is as follows: the leveling process adopts a double-leveling setting, the leveling elongation rate in the front of the furnace is 0.8-1.5%, the leveling elongation rate in the back of the furnace is 1.0-1.5%, the leveling machine is dry and smooth, and in order to ensure the surface quality of the strip steel, the brush roll device is installed behind the leveling machine, and the felt, the type of the leveling machine, is increased in the front of the furnace: dry temper mill/four roll, work roll diameter: 400-450mm, length of working roll: 1900mm, support roll diameter: 1050-: 1900mm, speed: 100m/min, deceleration acceleration: 0.7m/s2The rolling force is as follows: 5000kN, elongation 2.0%.
Preferably, the heating process is as follows: the strip steel enters an inlet sealing roller → an induction heater is used for heating, the plate temperature is 530 ℃ → the heat preservation section of an electric radiant tube is used for preserving heat → a steering tower top roller → a circulating jet cooling section → a hot tensioning roller chamber → a furnace nose → a zinc pot.
Preferably, the galvanizing process is as follows: the strip steel is immersed into aluminum-containing zinc liquid from a furnace nose through a zinc pot sink roll → the air knife scrapes off the redundant zinc liquid on the surface of the strip steel, thereby achieving the purpose of controlling the thickness of a coating layer → a cooling fan cools → the strip steel enters a water quenching tank → a zinc layer thickness gauge measures the thickness, the air knife has the pressure of 46mbar, the height of 200mm, the distance of 16mm and the aluminum content of the zinc liquid of 0.27 percent.
Preferably, the finishing process refers to: four-roller burnishing → burnishing liquid spray cleaning → wringing roller wringing → edge purging, wherein the burnishing machine is a four-roller type, and is driven by a support roller, controlled by hydraulic rolling force, automatically pressed down and controlled by a positive roller and a negative roller.
Preferably, the passivation process refers to: the strip steel is taken out of the withdrawal and straightening machine and then enters a horizontal passivation machine, a layer of passivation solution is coated on the surface of the strip steel, then the strip steel is dried by a steam heat exchanger at the temperature of 60 ℃ to solidify the passivation solution film, and then the strip steel enters a water cooling roller to cool the strip steel to the temperature below 50 ℃.
Preferably, the coiling process to form the hot-dip galvanized coil is as follows: the process for coiling the hot dip galvanized coil comprises the following steps: the recoiling machine recoils the finished product roll → the coil discharging trolley performs coil discharging → the finished product roll is transferred to the transport trolley by the coil discharging trolley → the coil transporting trolley transfers the finished product roll to the weighing saddle for weighing and bundling → is transferred to the finished product warehouse.
Example 5
A process method for producing 600g of hot-galvanized sheet without spangles on a zinc layer by a sheet continuous casting and rolling hot-base raw material and an acid pickling and galvanizing continuous production line comprises the following process steps: the raw material coil is produced by a continuous casting and rolling process of a full endless thin slab, and then is subjected to acid pickling, leveling, heating, galvanizing, finishing, passivating and coiling by an acid plating continuous production line to form a hot galvanized coil, wherein the specification of the product is 2.0mm x 1500mm, and the steel grade is SGH 400.
Preferably, the continuous casting and rolling process of the full endless thin slab is as follows: the continuous casting billet produced by the continuous casting machine directly enters a large-reduction rolling mill to be rolled to an 18mm intermediate billet, the intermediate billet is heated to 1100 ℃ by an induction heating furnace and then enters 5 frames of finish rolling, and is coiled after laminar cooling.
Preferably, the acid washing process is as follows: the raw material enters a phosphorus breaker to be treated → acid cleaning → rinsing → drying.
Preferably, the flattening process is as follows: the leveling process adopts double leveling setting, the elongation rate is leveled in the front of the furnace is 1.5%, the elongation rate is leveled in the back of the furnace is 1.5%, the leveling machine is dry and smooth, and in order to ensure the surface quality of the strip steel, the brush roll device is installed behind the leveling machine, the felt is added in the front of the furnace, and the type of the leveling machine is as follows: dry temper mill/four roll, work roll diameter: 400-450mm, length of working roll: 1900mm, support roll diameter: 1050-: 1900mm, speed: 80m/min, deceleration acceleration: 0.7m/s2The rolling force is as follows: 3500kN, elongation 1.5%.
Preferably, the heating process is as follows: the strip steel enters an inlet sealing roller → an induction heater is used for heating, the plate temperature is 480 ℃ → the heat preservation section of an electric radiant tube is used for preserving heat → a steering tower top roller → a circulating jet cooling section → a hot tensioning roller chamber → a furnace nose → a zinc pot.
Preferably, the galvanizing process is as follows: the strip steel is immersed into the aluminum-containing zinc liquid from the furnace nose through a zinc pot sink roll → the air knife scrapes off the redundant zinc liquid on the surface of the strip steel, thereby achieving the purpose of controlling the thickness of a coating layer → a cooling fan cools → the strip steel enters a water quenching tank → a zinc layer thickness gauge measures the thickness, the air knife pressure is 43mbar, the height is 230mm, the distance is 15mm, and the aluminum content of the zinc liquid is 0.3%.
Preferably, the finishing process refers to: four-roller burnishing → burnishing liquid spray cleaning → wringing roller wringing → edge purging, wherein the burnishing machine is a four-roller type, and is driven by a support roller, controlled by hydraulic rolling force, automatically pressed down and controlled by a positive roller and a negative roller.
Preferably, the passivation process refers to: the strip steel is taken out of the withdrawal and straightening machine and then enters a horizontal passivation machine, a layer of passivation solution is coated on the surface of the strip steel, then the strip steel is dried by a steam heat exchanger at the temperature of 90 ℃ to solidify the passivation solution film, and then the strip steel enters a water cooling roller to cool the strip steel to below 50 ℃.
Preferably, the coiling process to form the hot-dip galvanized coil is as follows: the process for coiling the hot dip galvanized coil comprises the following steps: the recoiling machine recoils the finished product roll → the coil discharging trolley performs coil discharging → the finished product roll is transferred to the transport trolley by the coil discharging trolley → the coil transporting trolley transfers the finished product roll to the weighing saddle for weighing and bundling → is transferred to the finished product warehouse.
Example 6
A process method for producing 600g of hot-galvanized sheet without spangles on a zinc layer by a sheet continuous casting and rolling hot-base raw material and an acid pickling and galvanizing continuous production line comprises the following process steps: the raw material coil is produced by a continuous casting and rolling process of a full endless thin slab, and then is subjected to acid pickling, leveling, heating, galvanizing, finishing, passivating and coiling by an acid plating continuous production line to form a hot galvanized coil, wherein the specification of the product is 2.0mm x 1500mm, and the steel grade is CSB.
Preferably, the continuous casting and rolling process of the full endless thin slab is as follows: the continuous casting billet produced by the continuous casting machine directly enters a large-reduction rolling mill, is rolled to a 15mm intermediate billet, is heated to 1200 ℃ by an induction heating furnace and then enters 5 frames of finish rolling, and is coiled after laminar cooling.
Preferably, the acid washing process is as follows: the raw material enters a phosphorus breaker to be treated → acid cleaning → rinsing → drying.
Preferably, the flattening process isThe method comprises the following steps: the leveling process adopts a double leveling setting, the furnace front leveling elongation rate is 0.8%, the furnace rear leveling elongation rate is 1.5%, the leveling machine is dry leveling, and in order to ensure the surface quality of the strip steel, the brush roll device is installed behind the leveling machine, the felt is added in front of the furnace, and the type of the leveling machine is as follows: dry temper mill/four roll, work roll diameter: 400-450mm, length of working roll: 1900mm, support roll diameter: 1050-: 1900mm, speed: 90m/min, deceleration acceleration: 0.7m/s2The rolling force is as follows: 9500kN, elongation 0.3-3.0%.
Preferably, the heating process is as follows: the strip steel enters an inlet sealing roller → an induction heater is used for heating, the plate temperature is 530 ℃ → the heat preservation section of an electric radiant tube is used for preserving heat → a steering tower top roller → a circulating jet cooling section → a hot tensioning roller chamber → a furnace nose → a zinc pot.
Preferably, the galvanizing process is as follows: the strip steel is immersed into aluminum-containing zinc liquid from a furnace nose through a zinc pot sink roller → the air knife scrapes off the redundant zinc liquid on the surface of the strip steel, thereby achieving the purpose of controlling the thickness of a coating layer → a cooling fan cools → the strip steel enters a water quenching tank → a zinc layer thickness gauge measures the thickness, the air knife has the pressure of 50mbar, the height of 230mm, the distance of 18mm and the aluminum content of the zinc liquid of 0.3 percent.
Preferably, the finishing process refers to: four-roller burnishing → burnishing liquid spray cleaning → wringing roller wringing → edge purging, wherein the burnishing machine is a four-roller type, and is driven by a support roller, controlled by hydraulic rolling force, automatically pressed down and controlled by a positive roller and a negative roller.
Preferably, the passivation process refers to: the strip steel is taken out of the withdrawal and straightening machine and then enters a horizontal passivation machine, a layer of passivation solution is coated on the surface of the strip steel, then the strip steel is dried by a steam heat exchanger at the temperature of 60 ℃ to solidify the passivation solution film, and then the strip steel enters a water cooling roller to cool the strip steel to the temperature below 50 ℃.
Preferably, the coiling process to form the hot-dip galvanized coil is as follows: the process for coiling the hot dip galvanized coil comprises the following steps: the recoiling machine recoils the finished product roll → the coil discharging trolley performs coil discharging → the finished product roll is transferred to the transport trolley by the coil discharging trolley → the coil transporting trolley transfers the finished product roll to the weighing saddle for weighing and bundling → is transferred to the finished product warehouse.
The properties of the products obtained in examples 1 to 6 are shown in Table 1:
TABLE 1 product Performance Table
Figure BDA0001566890410000101

Claims (4)

1. A process method for producing 600g of hot-galvanized sheet without spangles on a zinc layer by a sheet continuous casting and rolling hot-base raw material and an acid pickling and galvanizing continuous production line is characterized by comprising the following process steps: the raw material coil is produced by a continuous casting and rolling process of a full endless thin slab, and then is subjected to acid pickling, leveling, heating, galvanizing, finishing, passivating and coiling by an acid plating continuous production line to form a hot galvanized coil, wherein the specification of the hot galvanized coil is 2.0-3.0mm x 1500mm, and a zinc layer is 600g/m2Double-sided;
the full endless thin slab continuous casting and rolling process comprises the following steps: directly feeding a continuous casting billet produced by a continuous casting machine into a large-reduction rolling mill, rolling to an intermediate billet with the thickness of 8-20mm, heating to 1100-1200 ℃ by an induction heating furnace, then feeding into 5 frames for finish rolling, and coiling after laminar cooling;
the leveling process comprises the following steps: the leveling process adopts a double-leveling setting, the leveling elongation rate in the front of the furnace is 0.8-1.5%, the leveling elongation rate in the back of the furnace is 1.0-1.5%, the leveling machine is dry and smooth, and in order to ensure the surface quality of the strip steel, the brush roll device is installed behind the leveling machine, and the felt, the type of the leveling machine, is increased in the front of the furnace: dry temper mill/four roll, work roll diameter: 400-450mm, length of working roll: 1900mm, support roll diameter: 1050-: 1900mm, speed: 30-170m/min, deceleration acceleration: 0.7m/s2The rolling force is as follows: 1500-12000kN, elongation: 0.3 to 3.0 percent;
the heating process comprises the following steps: the method comprises the following steps that strip steel enters an inlet sealing roller → an induction heater is used for heating, the temperature of a plate is 480-550 ℃ → the heat preservation of an electric radiant tube heat preservation section → a steering tower top roller → a circulating jet cooling section → the strip steel enters a hot tensioning roller chamber → the strip steel enters a furnace nose → a zinc pot;
the galvanizing process comprises the following steps: the strip steel is immersed into the zinc liquid from the furnace nose through a zinc pot sink roller → the air knife scrapes off the redundant zinc liquid on the surface of the strip steel, thereby achieving the purpose of controlling the thickness of the coating layer → the cooling fan cools the strip steel → the strip steel enters a water quenching tank → a zinc layer thickness gauge measures the thickness; the air knife pressure is 43-50 mbar, the height is 140-230 mm, the distance is 15-18 mm, and the aluminum content of the zinc liquid is 0.27-0.3%;
the passivation process comprises the following steps: the strip steel is taken out of the withdrawal and straightening machine and then enters a horizontal passivation machine, a layer of passivation solution is coated on the surface of the strip steel, then the strip steel is dried by a steam heat exchanger at the temperature of 60-90 ℃ to solidify the passivation solution film, and then the strip steel enters a water cooling roller to cool the strip steel to below 50 ℃.
2. The process method for producing 600g of hot-galvanized sheet without spangles on the zinc layer by the sheet continuous casting and rolling hot-base raw material and the acid pickling and galvanizing continuous production line according to claim 1, wherein the acid pickling process comprises the following steps: the raw material enters a phosphorus breaker to be treated → acid cleaning → rinsing → drying.
3. The process method for producing 600g of hot-galvanized sheet without spangles on the zinc layer by the sheet continuous casting and rolling hot-base raw material and the acid pickling and galvanizing continuous production line according to claim 1, wherein the finishing process is as follows: four-roller burnishing → burnishing liquid spray cleaning → wringing roller wringing → edge purging, wherein the burnishing machine is a four-roller type, and is driven by a support roller, controlled by hydraulic rolling force, automatically pressed down and controlled by a positive roller and a negative roller.
4. The process method for producing the hot-galvanized sheet without spangles on the zinc layer by using the hot-base raw material for sheet continuous casting and rolling and the continuous production line for acid pickling and galvanizing according to claim 1, wherein the process for coiling the hot-galvanized sheet into the hot-galvanized coil is as follows: the recoiling machine recoils the finished product roll → the coil discharging trolley performs coil discharging → the finished product roll is transferred to the transport trolley by the coil discharging trolley → the coil transporting trolley transfers the finished product roll to the weighing saddle for weighing and bundling → is transferred to the finished product warehouse.
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Denomination of invention: Method for producing 600g zinc layer non zinc flower hot dip galvanized sheet based on thin slab continuous casting and rolling hot base raw material and acid plating continuous production line

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