CN215251102U - Ultrathin hot-base non-spangle hot-galvanized sheet production unit - Google Patents
Ultrathin hot-base non-spangle hot-galvanized sheet production unit Download PDFInfo
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- CN215251102U CN215251102U CN202121471256.2U CN202121471256U CN215251102U CN 215251102 U CN215251102 U CN 215251102U CN 202121471256 U CN202121471256 U CN 202121471256U CN 215251102 U CN215251102 U CN 215251102U
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Abstract
The utility model discloses an ultrathin hot-base non-spangle hot-galvanized sheet production unit, which belongs to the field of galvanizing equipment and comprises an uncoiler, an inlet shear, a thin-specification welding machine, a raw material storage loop, a scale breaker, a pickling tank, a rinsing section, a dryer, a temper mill, an electromagnetic induction heating furnace, a hot stretching chamber, a galvanizing zinc-plating pot, an air knife, a cooling fan, a water quenching tank, a roller painting passivation device, an outlet loop, an inspection table, an outlet shear and a coiling machine which are connected in sequence; the diameter of the submerged roller of the air knife system used in the galvanizing step is 580-600 mm. Compared with the prior art, the production of the zinc flower-free ultrathin hot-base galvanized sheet with the specification of 0.6-0.8mm can be realized, and the product has good surface quality, high dimensional precision, strong coating binding force and stable performance.
Description
Technical Field
The utility model relates to a steel production field, especially a production unit of ultra-thin heat base 0.6mm hot galvanized sheet without spangle.
Background
The hot-base galvanizing is a galvanized sheet which directly reaches the same specification after cold-base rolling without cold-rolling after hot-base strip steel is formed at one time, and has the characteristics of short process, environmental protection, energy conservation and the like. The hot-base galvanizing production mode reduces the product cost and stabilizes the product quality. At present, hot-base galvanizing is mainly applied to the thickness specification of strip steel of 2-4mm, for example, Chinese patents 'hot-rolled substrate continuous hot galvanizing production technology' (CN200810054779. X) and 'a hot-base galvanized steel coil and a preparation method thereof' (CN 202011026512.7), the process steps are that molten steel conforming to the composition of the hot-base galvanized steel coil is cast into a continuous casting billet, and then the hot-base galvanized steel coil is obtained through annealing furnace annealing, galvanizing of a zinc pot section, air knife blowing, cooling after galvanizing and water quenching treatment in sequence.
Based on the improvement of the production technology, the supply of thin raw materials becomes possible, but the hot substrate hot galvanizing process method without spangles with the thickness of 0.6-0.8mm is not available at present, and particularly, the production process of 2-4mm is adopted in the production of 0.6mm hot substrates, so that the equipment precision is low, the redundancy of hardware equipment is small, the production stability of ultrathin zinc plating production is extremely poor, and the use requirements of market customers cannot be met. Therefore, only cold-rolled materials can be used as the base plate in the range of 0.6-0.8mm, a cold-rolling annealing process is required to roll a thick plate to obtain a base material of the galvanized plate with the thickness of 0.6mm, and the main processes of the production of the ultrathin hot galvanized plate without zinc flowers with the thickness of 0.6mm are hot rolling → flattening → acid cleaning → heating → galvanizing → passivating → coiling and hot rolling → acid cleaning → cold rolling → annealing → galvanizing → finishing → passivating → coiling respectively. The process flow is complex and the cost is high.
SUMMERY OF THE UTILITY MODEL
The technical task of the utility model is to above prior art not enough, provide an ultra-thin hot base does not have spangle hot galvanized sheet production unit, fill internal blank.
The technical proposal of the utility model for solving the technical problem is that: the utility model provides an ultra-thin hot base does not have spangle hot dip galvanized sheet production unit which characterized in that: the device comprises an uncoiler, an inlet shear, a thin-specification welding machine, a raw material storage loop, a scale breaker, a pickling tank, a rinsing section, a dryer, a leveler, an electromagnetic induction heating furnace, a hot-expanding chamber, a galvanizing pot, an air knife, a cooling fan, a water quenching tank, a roller coating passivation device, an outlet loop, an inspection table, an outlet shear and a coiler which are sequentially connected; the diameter of the submerged roller of the air knife system used in the galvanizing step is 580-600 mm.
The uncoiler and the inlet shears are double-inlet shears of a double uncoiler.
A surface cleaning brush is arranged between the temper mill and the electromagnetic induction heating furnace.
In the optimization scheme, the polishing machine can be added into a water quenching tank and a roller coating passivation device for a polished product.
Compared with the prior art, the utility model discloses following outstanding beneficial effect has:
1. the production of the zinc-free ultrathin hot-base galvanized sheet with the specification of 0.6-0.8mm can be realized, and the product has good surface quality, high dimensional precision, strong coating binding force and stable performance;
2. based on a short-process heat-based product and an acid plating continuous production line, the acid plating is integrated, the process flow is shortened, the energy is saved, and the production cost is reduced;
3. the product has stable performance, the grain structure of the product is mainly ferrite and cementite, the grain size reaches 6-10.5 grades, and the use requirement of the industry is met;
4. the continuous hot galvanizing industrial production of the hot-base strip steel material with the thickness of 0.6mm is realized for the first time, the zinc layer range is 60-600 g/square meter, and the domestic blank is filled; the produced galvanized product is widely applied to the industries of household appliances, vehicles and the like, and enriches the variety and structure of the steel. The special brand of the stainless steel galvanized product has wide market prospect and obtains considerable economic benefit.
Drawings
FIG. 1 is a schematic view of the flow of a hot dip galvanizing unit of the present invention.
FIG. 2 is a structural diagram of the metallographic phase of the product before plating.
FIG. 3 is a structure diagram of the metallographic phase of the plated product.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
The utility model provides a based on integrative continuous production line of short process cast rolling one shot forming and acid-plating for the method of the ultra-thin spangle hot galvanized sheet of production heat-base can realize producing 0.6-0.8mm specification, and product surface quality is good, and performance and dimensional deviation are stable, and the cladding material cohesion is excellent, can replace the cold rolling spangle galvanized sheet of the same kind, adopts the utility model discloses can shorten process flow, energy saving, reduce cost, have considerable social economic benefits.
The utility model discloses the process steps include: hot rolling raw material → uncoiling → welding machine → phosphorus breaking → acid washing and rinsing → leveling → induction furnace heating (no recrystallization of strip steel) → galvanizing (air knife system) → cooling → passivation → drying → coiling → finished product. For the finished product, finishing may be added during the cooling and passivation steps.
As shown in fig. 1, the unit used in the hot galvanizing of the present invention includes an uncoiler 1, an entrance shear 2, a thin-gauge welder 3, a raw material storage loop 4, a descaler 5, a pickling tank 6, a rinsing section 7, a dryer 8, a leveler 9, a surface cleaning brush 10, an electromagnetic induction heating furnace 11, a hot stretching chamber 11, a zinc-plating pot 12, an air knife 13, a cooling fan 14, a water quenching tank 15, a roller coating passivation device 17, an outlet loop 18, an inspection table 19, an outlet shear 20 and a coiler 21, which are connected in sequence. For the finished product, a finishing machine 16 can be added in the water quenching tank 15 and the roller coating passivation device 17. The utility model discloses a pickling hot-galvanize continuous unit is a continuous unit and produces the line, compares with traditional cold rolling base plate and hot rolling base plate galvanizing process, has lacked the rolling process link of rolling mill, reduces cold rolling base plate or hot base pickling product to the link of transporting to the zinc-plated raw material storehouse simultaneously, shortens production cycle, improves production efficiency, reduction in production cost by a wide margin. The uncoiler 1 and the inlet shears 2 are a double uncoiler 1 and a double inlet shears 2.
The specific procedures are as follows:
1. a feeding operation unit: comprises an uncoiler 1, an inlet shear 2, a welding machine 3 and an inlet loop 4, and executes hot rolling raw material → uncoiling → welding machine operation;
an uncoiler 1 for uncoiling a steel coil;
the inlet scissors 2 cut off the defects of the head and the tail of the strip steel, thereby being beneficial to welding by a welding machine;
the welding machine 3 is used for welding the two steel coils to ensure the continuous production of the unit;
and the inlet loop 4 stores strip steel, so that the unit can realize the upgrading speed production.
2. A phosphorus breaking operation unit: comprises a phosphorus breaking machine 5 for carrying out phosphorus breaking operation. The scale on the surface of the raw material strip steel is damaged, the pickling effect is improved, and the strip shape of the raw material strip steel is improved. The elongation of the single equipment of the phosphorus breaking machine is 0.4-0.6%.
3. Acid washing and rinsing operation unit: comprises a pickling tank 6, a rinsing section 7 and a dryer 8, and performs pickling and rinsing operations;
the pickling tank 6 specifically comprises 2 pickling tanks for washing away iron scales on the surface of the strip steel, and the total length of the pickling tanks is 50 meters; the traditional pickling process generally comprises 3 or 4 pickling tanks, and the total length of the pickling tanks is more than 100 meters;
the rinsing section 7 is specifically a 5-level rinsing section and is used for washing away residual Cl ions and impurities on the surface of the strip steel, so that the surface cleanliness is improved, and the galvanization is facilitated; in the optimized scheme, a high-pressure washing device can be arranged behind the last rinsing section, so that the cleaning effect of the surface of the strip steel can be further improved;
and (3) a dryer 8: drying the water on the surface of the strip steel coming out of the rinsing tank to prevent corrosion.
4. A leveling operation unit: including a leveler 9, performs leveling operations. The strip shape of the strip steel is improved, the roughness of the surface of the raw material strip steel is improved through the roughness of the working roll, and the strip steel is favorably galvanized. For the plate-type of guaranteeing to go into zinc pot belted steel and the zinc-plating back belted steel plate-type, the utility model discloses a leveling machine equipment is increased to domestic initiative two levels, go into the zinc-plating stokehold after the pickling before, is equipped with a finishing machine equipment after the zinc-plating, has realized the production with the different intensity level zinc-plated product of raw materials. The sum of the elongation rates of the scale breaking and leveling equipment is 0.6-1.0%. The utility model discloses technology adopts the technology of gently pushing down, realizes the effective control of control plate shape.
5. A heating operation unit: comprises an induction heating furnace 10 and a hot stretching chamber 11 which are connected in sequence, and the heating operation of the induction furnace is executed, and the strip steel is not recrystallized;
the induction heating furnace 10 heats the strip steel through an induction coil at the temperature of 485 and 515 ℃; the utility model discloses the galvanizing furnace of line is produced in the zinc-plating is induction heating furnace, and the nuclear core heat of belted steel has the difference that strengthens with traditional annealing galvanizing line comparison: the furnace characteristics of the annealing galvanized wire are as follows: the furnace length is about 100 meters, the heating section is long, the hearth temperature is high, the core heat before the strip steel reaches the cooling fan is very large, so the plate temperature needs to be reduced to be very low, and when the strip steel is close to the zinc liquid, the plate temperature is raised to be proper temperature (namely 15-20 ℃ higher than the temperature of the zinc liquid) due to the outward diffusion of the core heat. The furnace of the production line of the utility model is induction heating, the surface of the strip steel is heated to a very high temperature by about 0.1mm, but the temperature of the strip steel is already reduced a lot before the strip steel reaches the cooling fan due to the effect of heat conduction, and the power of the subsequent electric radiant tube is small and only plays a role of heat preservation, so the pot-entering temperature of the strip steel is relatively high;
the hot stretching chamber 11 is used for preserving heat of the strip steel through an electric radiation tube within a temperature range of 410-425 ℃, and preserving heat of the strip steel to ensure that the strip steel is within a certain temperature range before entering a zinc pot; the recrystallization annealing of the strip steel does not occur in the furnace, and the energy consumption is reduced.
6. A galvanizing operation unit: comprises a galvanizing pot 12 and an air knife 13, and performs galvanizing operation;
the zinc plating is carried out by improving hardware and controlling the temperature of a zinc pot, three rollers, six arms, an air knife and other process parameters.
Hardware improvement: the size range of the sink roll in the air knife system is defined as roll diameter 580 or 600mm and length 1900 mm. The process adjusts the diameter of the sink roll, realizes effective quality control of the hot-base ultrathin specification production plate shape through contact arc length tension, and reduces the subsequent finishing process; and in the production with the same thickness of the zinc layer, the tension of the strip steel in a zinc pot is reduced, and the tension among the sinking roller, the rectifying roller and the stabilizing roller is set within the range of 32-42 KN. By combining the soft pressing process in the scale breaking and leveling process stage with the technology of increasing the diameter of the sink roll and reducing the tension between the rolls, better plate shape quality is obtained on the premise of not damaging the surface layer quality.
The temperature of the zinc pot is as follows: the pot entry temperature is 485 plus 515 ℃, compared with the thickness specification of strip steel of 2-4mm, the ultrathin specification production has short heating time and low heat output, and mainly reflects that the pot entry temperature has 10 ℃ of heat output and the temperature of zinc liquid: 465 +/-5 ℃; the galvanizing furnace of the pickling hot galvanizing continuous unit adopts the induction coil for heating, the highest heating temperature in the furnace is 530 ℃, and the strip steel is not recrystallized; compared with the traditional galvanizing process by open fire heating or coal gas heating, the energy consumption is low and the cost is greatly reduced.
7. A cooling operation unit: comprises a cooling fan 14 and a water quenching tank 15, and carries out cooling operation; and cooling the surface temperature of the galvanized strip steel, protecting the process rubber roller, and influencing the subsequent passivation surface treatment process and passivation effect if the surface temperature of the strip steel is too high.
8. A finishing operation unit: including a finisher 16, performs finishing operations. The method is used for improving the shape and the surface structure of the galvanized strip steel; for unfinished products, the process steps and the work cell may be eliminated. And (3) controlling the total elongation of scale breaking, leveling and finishing of the finished product to be 1.7-2.3%. The process control measure of the interval rolling reduction can control the quality of the galvanized plate surface and the plate shape more stably, and can realize the hot-base ultrathin galvanized plate meeting the quality requirements of market customers.
In an optimized scheme, a group of intermediate loops can be arranged between the water quenching tank 15 and the finisher 16. The subsequent equipment arrangement and process do not use a withdrawal and straightening machine. The hot base ultrathin zinc plating process features less total pressure drop, stable control of plate shape and less pressing equipment.
9. A passivation operation unit: comprises a roller coating passivation device 17 for performing passivation treatment and drying operation; the surface of the strip steel is provided with a layer of protective film through passivation, so that the effects of corrosion resistance and rust resistance are achieved.
10. A discharging operation unit: comprises an outlet loop 18, an inspection platform 19, an outlet shear 20 and a coiling machine 21, and executes coiling operation;
the outlet loop 18 stores strip steel to realize the unit upgrading speed production;
an inspection table 19 for inspecting the surface of the strip steel by staff;
and (3) outlet shears 20: shearing the strip steel and coiling the strip steel according to the weight;
the coiler 21: and coiling the strip steel.
Each of the above-mentioned apparatuses is a facility commonly used in the existing steel production, and therefore, the specific structure of the single equipment is not described herein.
To better compare the formulations of the present application with the prior art, comparative tests were performed.
The hot rolling raw materials of the control groups 1 to 2 and the examples 1 to 4 are: ESP hot-rolled raw material with the width of 1250 mm; DX51D + Z. The process comprises the following steps: hot rolling raw material → uncoiling → welding machine → phosphorus breaking → acid washing and rinsing → leveling → induction furnace heating (no recrystallization of strip steel) → galvanizing (air knife system) → cooling → finishing → passivation → drying → coiling → finished product.
For control of parameters in extension for each group see table below:
see table below for various sets of parameter control:
FIG. 2 is a structural diagram of the metallographic phase of the product before plating, and FIG. 3 is a structural diagram of the metallographic phase of the product after plating, so that the process can realize the manufacture of the hot-base ultrathin galvanized product, the structural grain distribution state of the product, the size precision of the product and the like all accord with the product design standard, and the basic requirements of market customers on the application quality of the product are met.
The results of the quality control comparison of each group are shown in the following table:
can find out by the above-mentioned result, use the utility model discloses the unit can effectual assurance target width, and adopts the contrast group 1 of traditional 2~4mm thickness specification technology, and production stability is extremely poor, and the actual width is difficult to reach 1250 mm's target width, can't satisfy market customer user demand. Only the comparison group 2 of the roll diameter is updated, because the elongation is still high, the feedback value is lower than the tension between the set rolls during the later stage galvanizing, the specification and quality requirements can not be met, namely the width of the galvanized strip steel at the outlet can be improved by increasing the roll diameter of the submerged roll under large tension, but the effective control of the target dimension can not be realized, thereby the equipment arrangement of the original traditional 2-4mm thickness specification process can not stably produce the hot-base ultrathin specification galvanized product.
The utility model discloses the effective control of stable output and quality of the ultra-thin specification galvanized product of effectual realization hot base of unit, its 0.6mm galvanized product quality can realize filling the market blank of this specification of internal hot base galvanizing to the iteration upgrade of the cold base galvanized product with the specification, effectual increase galvanizing market product selectivity, and then promote the brand effect of internal hot base galvanizing in market competition.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (4)
1. The utility model provides an ultra-thin hot base does not have spangle hot dip galvanized sheet production unit which characterized in that: the device comprises an uncoiler, an inlet shear, a thin-specification welding machine, a raw material storage loop, a scale breaker, a pickling tank, a rinsing section, a dryer, a leveler, an electromagnetic induction heating furnace, a hot-expanding chamber, a galvanizing pot, an air knife, a cooling fan, a water quenching tank, a roller coating passivation device, an outlet loop, an inspection table, an outlet shear and a coiler which are sequentially connected; the diameter of the submerged roller of the air knife system used in the galvanizing step is 580-600 mm.
2. The ultra-thin hot-based non-spangle hot-dip galvanized sheet production line according to claim 1, characterized in that: the uncoiler and the inlet scissors are double-inlet scissors of a double uncoiler.
3. The ultra-thin hot-based non-spangle hot-dip galvanized sheet production line according to claim 1, characterized in that: and a surface cleaning brush is arranged between the temper mill and the electromagnetic induction heating furnace.
4. The ultra-thin hot-based non-spangle hot-dip galvanized sheet production line according to claim 1, characterized in that: for the finished product, a finishing machine can be added in a water quenching tank and a roller coating passivation device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121471256.2U CN215251102U (en) | 2021-06-30 | 2021-06-30 | Ultrathin hot-base non-spangle hot-galvanized sheet production unit |
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| CN202121471256.2U CN215251102U (en) | 2021-06-30 | 2021-06-30 | Ultrathin hot-base non-spangle hot-galvanized sheet production unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115386820A (en) * | 2022-08-30 | 2022-11-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Compound production line and production process for hot-base galvanized plate and pickled plate |
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2021
- 2021-06-30 CN CN202121471256.2U patent/CN215251102U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115386820A (en) * | 2022-08-30 | 2022-11-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Compound production line and production process for hot-base galvanized plate and pickled plate |
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