CN210261916U - Annealing furnace for stainless steel band - Google Patents
Annealing furnace for stainless steel band Download PDFInfo
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- CN210261916U CN210261916U CN201822272196.6U CN201822272196U CN210261916U CN 210261916 U CN210261916 U CN 210261916U CN 201822272196 U CN201822272196 U CN 201822272196U CN 210261916 U CN210261916 U CN 210261916U
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Abstract
The utility model discloses an annealing furnace for stainless steel bands, which comprises a heating mechanism, an air cooling mechanism, a water cooling mechanism and a drying mechanism, wherein the heating mechanism comprises an inlet sealing section, a preheating zone, a heating zone and an outlet sealing section, the preheating zone and the heating zone are packaged into a closed mechanism by the inlet sealing section and the outlet sealing section, the heating zone is provided with a heating nozzle, flame is sprayed out by the heating nozzle to heat the stainless steel bands and generate smoke; the preheating zone preheats the stainless steel band by the convection and radiation of the flue gas; the drying mechanism comprises an air heater, and the heat source of the air heater is the smoke and the waste heat generated by the heating mechanism. Adopt the utility model discloses, simple structure simplifies traditional annealing process, and the stainless steel band finished product mechanical properties who makes is good. Moreover, the heat energy consumption is small, and the energy-saving effect is obvious.
Description
Technical Field
The utility model relates to a stainless steel technical field especially relates to an annealing stove of stainless steel band.
Background
The stainless steel band is an extension of the ultrathin stainless steel band, mainly a narrow and long steel band produced to meet the needs of different industrial departments for industrially producing various types of metal or mechanical products, is widely applied to high technology industry, IT industry, aviation and aerospace industry, has high added value, but the rolling process is difficult to master, because internal stress can be generated in the stainless steel band after primary rolling, the effect of finish rolling is influenced, the forming of finished products is greatly influenced, different finished products have different requirements on hardness, the difficulty of the rolling process is increased, the production efficiency is low, and the yield is not high.
In order to remove stress generated after rolling, an annealing process is mostly used, however, the annealing temperature and the holding time of the conventional annealing process are long, which results in a drastic decrease in production efficiency. Moreover, the problems of tape breakage, poor material quality, uneven hardness distribution, poor surface quality, surface scratches, and the like are likely to occur during the annealing process. In addition, the annealing temperature of the existing annealing process is high, the consumed heat energy is large, and the energy conservation and the environmental protection are not facilitated.
Chinese patent publication No. CN 106244783B discloses "a continuous production method of stainless steel strip steel", which includes the steps of cold rolling, annealing, derusting, leveling, etc., wherein the strip steel after cold rolling is continuously annealed, and the four stages are: a preheating stage: the temperature of the strip steel is raised to 380 ℃ from the natural temperature, and the preheating time is 20 s; a temperature rising stage: heating the strip steel from 380 ℃ to 1130 ℃ for 40 s; and (3) a heat preservation stage: maintaining the temperature of the strip steel at 1130 ℃ and keeping the temperature for 8 s; and (3) cooling: the strip steel enters an air cooling section for cooling for 7s, the temperature is reduced to 400 ℃, then enters a water mist cooling section for cooling for 10s, the temperature is reduced to 200 ℃, and finally enters a water cooling section for cooling for 3.5s, and the temperature is reduced to below 80 ℃.
The annealing process needs to be accurately controlled, the production difficulty is high, the residual stress of the stainless steel band can be removed through the annealing process, however, only 20s is needed for preheating to 380 ℃, the temperature of the band steel is increased from 380 ℃ to 1130 ℃, the temperature-increasing time is only 40s, the preheating and the temperature-increasing are both independent heat sources, in addition, the cooling stage is also rapid cooling, the cooling is easy to be uneven, the mechanical property of the stainless steel band is not ideal enough, the elongation is only 46-55%, in addition, the surface smoothness is Ra0.6-0.8, and the appearance is not bright enough.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a stainless steel strip's annealing stove is provided, can simplify traditional annealing process, and the stainless steel strip finished product mechanical properties who makes is good, and the roughness is good, and hardness is even, and roughness is little, and the outward appearance is bright high-grade.
The utility model aims to solve the technical problem that an annealing furnace of stainless steel band is provided, the consumed heat energy is less, and the energy-saving effect is obvious.
In order to solve the problem, the utility model provides a pair of stainless steel strip's annealing stove, including heating mechanism, air cooling mechanism, water-cooling mechanism and dry mechanism, wherein, heating mechanism is including entry seal section, preheating zone, the zone of heating and export seal section, entry seal section and export seal section will preheat zone, the zone of heating encapsulation be a closing mechanism, the zone of heating is equipped with heating nozzle, heating nozzle blowout flame carries out heat treatment to stainless steel strip to produce the flue gas, so that stainless steel strip follows T from the T steel strip1Heating to 1160 deg.C, and maintaining the temperature of the stainless steel band above 1080 deg.C for at least 15 s; the preheating zone preheats the stainless steel strip by convection and radiation of flue gas so that the stainless steel strip is heated from 30 ℃ to T1，T1＝250-300℃；
The air cooling mechanism sequentially cools the stainless steel strip through air;
the water cooling mechanism comprises a spraying box, and cooling water and compressed air are introduced into the spraying box;
the drying mechanism comprises an air heater, and the heat source of the air heater is the smoke and the waste heat generated by the heating mechanism;
the annealing furnace is provided with at least 7 sets of plate thermometers, at least 3 sets of plate thermometers are installed in the heating mechanism, at least 2 sets of plate thermometers are installed in the air cooling mechanism, at least 1 set of plate thermometers are installed at an inlet of the water cooling mechanism, and at least 1 set of plate thermometers are installed in the drying mechanism.
As an improvement of the scheme, the length of the annealing furnace is 240m for 200-;
the first plate thermometer is arranged at a position 90-100m away from the inlet of the annealing furnace and is used for controlling the temperature at 580-620 ℃;
the second plate thermometer is arranged at a position which is 115-125m away from the inlet of the annealing furnace and is used for controlling the temperature to be 1080 ℃;
the third plate thermometer is arranged at the position of 135-145m away from the inlet of the annealing furnace and is used for controlling the temperature at 1100-1160 ℃;
the fourth plate thermometer is arranged at the position which is 150-155m away from the inlet of the annealing furnace and is used for controlling the temperature at 950-980 ℃;
the fifth plate thermometer is arranged at a position 180-188m away from the inlet of the annealing furnace and is used for controlling the temperature at 400-460 ℃;
the sixth plate thermometer is arranged at a position 200-210m away from the inlet of the annealing furnace and is used for controlling the temperature to be between room temperature and 180 ℃;
the seventh plate thermometer is arranged at a position which is 220m away from the inlet of the annealing furnace and is used for controlling the temperature to be between room temperature and 70 ℃.
As an improvement of the scheme, the fourth plate thermometer and the fifth plate thermometer are both arranged in an air cooling section of the annealing furnace, the air cooling section between the fourth plate thermometer and the fifth plate thermometer is arranged, and the cooling rate of the stainless steel band is more than 50 ℃/s;
the second plate temperature meter and the third plate temperature meter are both arranged at the heating section of the annealing furnace, the heating section between the fourth plate temperature meter and the fifth plate temperature meter, and the heating rate of the stainless steel band is maintained at 8-12 ℃/s.
As a modification of the above, the heating zone includes a first heating section, a second heating section, a third heating section, a fourth heating section, a fifth heating section, a sixth heating section, a seventh heating section, an eighth heating section, a ninth heating section, and a tenth heating section;
the number of the burners of the first heating subarea is 10-16, and the power of the burners is 6500 and 7000 kw;
the number of the burners of the second heating subarea is 10-16, and the burner power is 6300-;
the number of the burners of the third heating subarea is 10-16, and the power of the burners is 5400-6000 kw;
the number of the burners of the fourth heating subarea is 10-16, and the power of the burners is 4800-;
the number of the burners of the fifth heating subarea is 10-16, and the power of the burners is 4000-;
the number of the burners of the sixth heating subarea is 10-16, and the power of the burners is 3500-4000 kw;
the number of the burners of the seventh heating subarea is 10-16, and the power of the burners is 2500-;
the number of the burners of the eighth heating subarea is 10-16, and the power of the burners is 1400-2000 kw;
the number of the burners of the ninth heating subarea is 10-16, and the power of the burners is 1200-1800 kw;
the number of the burners of the tenth heating subarea is 10-16, and the burner power is 1200-1800 kw.
As an improvement of the scheme, the heating zone is also provided with a combustion-supporting fan and an exhaust fan, and the flow of the combustion-supporting fan is 60000-68000m3The pressure is 12-18KPa, and the air inlet temperature is 20-30 ℃;
the flow rate of the exhaust fan is 180000-210000m3The pressure is 2-3KPa, and the air outlet temperature is 150-.
As an improvement of the scheme, the furnace top of the heating zone is provided with a ceramic fiber module, the porosity of the ceramic fiber module is 93-98%, and the thickness of the ceramic fiber module is 200-500 mm.
As an improvement of the proposal, the air cooling mechanism comprises a first air cooling unit, a second air cooling unit and a third air cooling unitThe air cooling system comprises a first air cooling unit, a second air cooling unit, a third air cooling unit, a fourth air cooling unit, a fifth air cooling unit, a sixth air cooling unit, a seventh air cooling unit and an eighth air cooling unit; the smoke discharge flow of the first air cooling unit and the second air cooling unit is 180000-3The exhaust temperature of the exhaust gas is 180-200 ℃, and the pressure is 140-160 daPa;
the exhaust gas flow rates of the third air cooling unit and the fourth air cooling unit are 250000 and 280000m3The exhaust temperature of the exhaust gas is 110-140 ℃, and the pressure is 140-160 daPa;
the smoke discharge flow rates of the fifth air cooling unit and the sixth air cooling unit are 240000-260000m3The exhaust temperature of the exhaust gas is 80-100 ℃, and the pressure is 140-;
the exhaust gas flow rates of the seventh air cooling unit and the eighth air cooling unit are 230000-250000m3The exhaust temperature of the exhaust gas is 60-85 ℃, and the pressure is 140-160 daPa.
As an improvement of the scheme, the flow rate of the exhaust smoke, the discharge temperature of the exhaust smoke and the pressure of the exhaust smoke of the first air cooling unit and the second air cooling unit are the same;
the third air cooling unit and the fourth air cooling unit have the same smoke discharge flow, the same smoke discharge temperature and the same smoke discharge pressure;
the flow rate of the smoke discharged by the fifth air cooling unit and the sixth air cooling unit is the same as the discharge temperature and the pressure of the smoke discharged by the sixth air cooling unit;
the flow rate of the exhaust smoke, the discharge temperature of the exhaust smoke and the pressure of the exhaust smoke of the seventh air cooling unit are the same as those of the exhaust smoke of the eighth air cooling unit.
As a modification of the above scheme, the first air cooling unit, the second air cooling unit, the third air cooling unit, the fourth air cooling unit, the fifth air cooling unit, the sixth air cooling unit, the seventh air cooling unit and the eighth air cooling unit are provided with pressure regulators;
the outlet of air cooling mechanism is equipped with infrared pyrometer, infrared pyrometer is connected with pressure regulator for according to the temperature of the stainless steel band that infrared pyrometer detected, come the automatic pressure of revising first air cooling unit, second air cooling unit, third air cooling unit, fourth air cooling unit, fifth air cooling unit, sixth air cooling unit, seventh air cooling unit and eighth air cooling unit through pressure regulator.
As an improvement of the proposal, the flow of the cooling water introduced into the spraying box is 15-25m3The flow rate of the introduced compressed air is 1200-1800Nm3H is used as the reference value. The flow rate of the hot air blower is 20000-3The pressure is 800-1200 daPa.
Implement the utility model discloses, following beneficial effect has:
(1) the utility model provides a pair of stainless steel strip's annealing stove, including heating mechanism, air cooling mechanism, water cooling mechanism and dry mechanism, a structure is simple, preheat through heating mechanism, heating treatment, and the even cooling of air cooling mechanism and water cooling mechanism, effectively repair the plastic deformation damaged crystalline phase structure that belted steel produced in rolling, refine the lattice structure, the machining performance after the cold rolling has been improved greatly, the stainless steel strip finished product mechanical properties who makes is good, the roughness is good, the hardness is even, the roughness is little, the bright high-grade of outward appearance, effectively avoid taking place absolutely, the material is poor, the hardness is uneven, poor surface quality, the problem of surface fish tail, the lumber recovery of product has been improved. The stainless steel band finished product has good mechanical property, the yield strength is 300-350MPa, the tensile strength is 700-750MPa, the tensile rate is 60-70%, and the hardness is 170-190 HV.
(2) The utility model discloses heating mechanism is including the sealed section of entry, preheating zone, the zone of heating and the sealed section of export, and wherein, the used heat source of preheating zone is the flue gas convection and the radiation that nozzle spun flame produced, has realized the cyclic utilization of furnace zone high temperature waste gas, utilizes combustion-supporting air through the flue gas waste heat and will preheat, and energy-conserving effect is showing. Moreover, the flue gas and the waste heat generated by the heating area can also be used for drying the stainless steel band, so that the flue gas can be secondarily utilized.
(3) The utility model discloses stainless steel band utilizes the convection current and the radiation of flue gas to heat to 250-.
(4) The utility model discloses a set for the position that the board thermometer arranged, the actual temperature of measurement steel band that it can be accurate to adjust furnace temperature according to the actual temperature of steel band and set for and speed settlement, guarantee the correct execution of thermal treatment technology, ensure that steel band mechanical properties is stable.
(5) The air cooling mechanism comprises a first air cooling unit, a second air cooling unit, a third air cooling unit, a fourth air cooling unit, a fifth air cooling unit, a sixth air cooling unit, a seventh air cooling unit and an eighth air cooling unit, wherein the air cooling treatment of the stainless steel is realized by 8 control units, the flatness of the strip steel is ensured through stable cooling, carbide precipitation is avoided, the plasticity of the strip steel is increased, the elongation can reach 60-70%, the surface roughness of a stainless steel finished product is small, and the stainless steel finished product is bright and straight.
Drawings
FIG. 1 is a schematic view showing the structure of an annealing furnace for stainless steel strips according to the present invention.
Fig. 2 is a schematic structural view of the heating mechanism shown in fig. 1.
Fig. 3 is a schematic structural view of the air cooling mechanism shown in fig. 1.
Fig. 4 is a schematic structural view of the water cooling mechanism and the drying mechanism shown in fig. 1.
Fig. 5 is a schematic view of the installation position of the plate thermometer of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below.
As shown in figure 1, the utility model provides a pair of stainless steel strip's annealing stove, including heating mechanism 1, air cooling mechanism 2, water cooling mechanism 3 and drying mechanism 4, wherein, heating mechanism 1 is including entry seal segment 11, preheating zone 12, the zone of heating 13 and export seal segment 14, entry seal segment 11 and export seal segment 14 encapsulate preheating zone 12, zone of heating 13 into a close mechanism, the zone of heating 13 is equipped with the heating nozzle, heating nozzle blowout flame adds thermal treatment to stainless steel strip to produce the flue gas, so that stainless steel strip follows T from T steel strip1Heating to 1160 deg.C, and heating stainless steel band to 1080 deg.C15 seconds less; the preheating zone preheats the stainless steel strip by convection and radiation of flue gas so that the stainless steel strip is heated from 30 ℃ to T1，T1＝250-300℃。
Preferably, the length of the inlet seal section 11 is 1 to 3m, the length of the preheating zone 12 is 25 to 35m, the length of the heating zone 13 is 55 to 80m, and the length of the outlet seal section 14 is 2 to 5 m. The inlet sealing section 11 is an inlet sealing device, the inlet sealing section 11 is provided with a waste gas circulation system for discharging the flue gas of the heating zone to the inlet sealing section, and the heat in the flue gas is partially recovered by the preheating section through convection and radiation. The outlet sealing section 14 is an outlet sealing device.
The utility model discloses the convection current and the radiation that the stainless steel band utilized the flue gas heat to 250-. And the annealing process is simplified, the high-temperature annealing time is shortened, and the production efficiency is improved.
Specifically, as shown in fig. 2, the heating zone 13 includes a first heating sub-zone 131, a second heating sub-zone 132, a third heating sub-zone 133, a fourth heating sub-zone 134, a fifth heating sub-zone 135, a sixth heating sub-zone 136, a seventh heating sub-zone 137, an eighth heating sub-zone 138, a ninth heating sub-zone 139, and a tenth heating sub-zone 140; and each heating subarea is provided with a burner, and the burners spray flames to heat the stainless steel band.
The number of the burners of the first heating subarea 131 is 10-16, the burner power is 6500-7000kw, and the furnace top temperature is 1200-1280 ℃;
the number of the burners of the second heating subarea 132 is 10-16, the burner power is 6300-6800kw, and the furnace top temperature is 1200-1280 ℃;
the number of the burners of the third heating subarea 133 is 10-16, the burner power is 5400-6000kw, and the furnace top temperature is 1200-1280 ℃;
the number of the burners of the fourth heating subarea 134 is 10-16, the burner power is 4800-;
the number of the burners of the fifth heating subarea 135 is 10-16, the burner power is 4000-4300kw, and the furnace top temperature is 1200-1280 ℃;
the number of the burners of the sixth heating partition 136 is 10-16, the burner power is 3500-4000kw, and the furnace top temperature is 1200-1280 ℃;
the number of the burners of the seventh heating subarea 137 is 10-16, the power of the burners is 2500-3200kw, and the temperature of the furnace top is 1190-1260 ℃;
the number of the burners of the eighth heating partition 138 is 10-16, the burner power is 1400-2000kw, and the furnace top temperature is 1150-1220 ℃;
the number of the burners of the ninth heating subarea 139 is 10-16, the burner power is 1200-1800kw, and the furnace top temperature is 1150-1220 ℃;
the number of burners of the tenth heating partition 140 is 10-16, the burner power is 1200-1800kw, and the furnace top temperature is 1150-1220 ℃.
The utility model discloses realize the heating control to stainless steel band through 10 heating subareas, heating control is accurate. Moreover, the burner power of the 10 heating subareas is set according to the performance of the stainless steel strip, the burner power is gradually reduced, and the mechanical property of the stainless steel strip can be ensured through stable heating.
Preferably, in order to ensure the heating effect, the heating zone is further provided with a combustion fan and an exhaust fan, and the flow rate of the combustion fan is 60000-68000m3The pressure is 12-18KPa, and the air inlet temperature is 20-30 ℃; the flow rate of the exhaust fan is 180000-210000m3The pressure is 2-3KPa, and the air outlet temperature is 150-.
The furnace top of the heating zone is provided with a ceramic fiber module, the porosity of which is 93-98%, and the thickness of which is 200-500 mm. The ceramic fiber is a fibrous light refractory material, and has the advantages of light weight, high temperature resistance, good thermal stability, low thermal conductivity, small specific heat, mechanical shock resistance and the like. The utility model discloses add the furnace roof and establish ceramic fiber module, can improve the heat preservation effect and the heat-resisting effect of the zone of heating, and its adiabaticity is good, is favorable to guaranteeing the safety of production, improves the environment in workshop.
As shown in fig. 3, the air cooling mechanism 2 includes a first air cooling unit 21, a second air cooling unit 22, a third air cooling unit 23, a fourth air cooling unit 24, a fifth air cooling unit 25, a sixth air cooling unit 26, a seventh air cooling unit 27, and an eighth air cooling unit 28, and the first air cooling unit 21, the second air cooling unit 22, the third air cooling unit 23, the fourth air cooling unit 24, the fifth air cooling unit 25, the sixth air cooling unit 26, the seventh air cooling unit 27, and the eighth air cooling unit 28 sequentially cool the stainless steel strip by air. The utility model discloses air cooling mechanism 2 is realized by 8 the control unit, and length is 8 (6m-9m) ═ 48m-72m, preferably 8 (7 m) ═ 56m, guarantees the roughness of belted steel and avoids the carbide to deposit through steady cooling, has guaranteed the off-the-shelf quality of stainless steel.
Preferably, the flow rates of the exhaust gas of the first air cooling unit 21 and the second air cooling unit 22 are 180000 and 220000m3The exhaust temperature of the exhaust gas is 180-200 ℃, and the pressure is 140-160 daPa;
the flow rates of the exhaust gas of the third air cooling unit 23 and the fourth air cooling unit 24 are 250000 and 280000m3The exhaust temperature of the exhaust gas is 110-140 ℃, and the pressure is 140-160 daPa;
the exhaust gas flow rates of the fifth air cooling unit 25 and the sixth air cooling unit 26 are 240000-260000m3The exhaust temperature of the exhaust gas is 80-100 ℃, and the pressure is 140-;
the exhaust gas flow rates of the seventh air cooling unit 27 and the eighth air cooling unit 28 are 230000-250000m3The exhaust temperature of the exhaust gas is 60-85 ℃, and the pressure is 140-160 daPa.
Preferably, the flow rate of the exhaust gas, the exhaust temperature of the exhaust gas, and the pressure of the exhaust gas in the first air cooling unit 21 and the second air cooling unit 22 are the same; the third air cooling unit 23 and the fourth air cooling unit 24 have the same flow rate of exhaust smoke, the same exhaust temperature and the same pressure of exhaust smoke; the fifth air cooling unit 25 and the sixth air cooling unit 26 have the same flow rate of exhaust gas, the same exhaust temperature of exhaust gas, and the same pressure; the seventh air cooling unit 27 and the eighth air cooling unit 28 have the same flow rate of exhaust gas, the same exhaust temperature, and the same pressure.
The utility model discloses the air cooling section is realized by 8 the control unit, and sets up the cooling condition of two adjacent air cooling units to the same innovatively, guarantees the roughness of belted steel and avoids the carbide to precipitate through steady cooling, makes belted steel plasticity increase, and the percentage elongation can reach 60-70%, and stainless steel finished product roughness is little, and is bright straight.
Furthermore, the utility model discloses can adjust the cooling of stainless steel band according to the hot demand to adjust the pressure of fan input, prevent that the stainless steel band from warping. The set value of the pressure can be automatically corrected according to the temperature of the stainless steel band measured by an infrared pyrometer, the infrared pyrometer is arranged at an outlet of an air cooling section, and the specific structure is as follows:
the first air cooling unit 21, the second air cooling unit 22, the third air cooling unit 23, the fourth air cooling unit 24, the fifth air cooling unit 25, the sixth air cooling unit 26, the seventh air cooling unit 27 and the eighth air cooling unit 28 are provided with pressure regulators;
and an infrared pyrometer is arranged at an outlet of the air cooling mechanism and is connected with a pressure regulator, and the pressure regulator is used for automatically correcting the pressure of the first air cooling unit 21, the second air cooling unit 22, the third air cooling unit 23, the fourth air cooling unit 24, the fifth air cooling unit 25, the sixth air cooling unit 26, the seventh air cooling unit 27 and the eighth air cooling unit 28 according to the temperature of the stainless steel strip detected by the infrared pyrometer.
As shown in fig. 4, the water cooling mechanism 3 has a length of 6-7m, and includes a spray box 31, the length of the spray box is 2-3m, cooling water and compressed air are introduced into the spray box 31, and the flow rate of the cooling water is 15-25m3The flow rate of the compressed air is 1200-1800Nm3H is used as the reference value. The spraying box 31 cools the stainless steel strip to 80 ℃ to realize the second cooling treatment.
The drying mechanism 4 comprises a drying roller (not shown in the figure) and a hot air blower 42, and the heat source of the hot air blower 42 is the smoke and the waste heat generated by the heating mechanism 1.
The wringing roller is used for removing water brought by water quenching on the surface of the stainless steel belt. The wringing roller typically includes upper and lower rollers that are each driven by a cylinder and that can be adjusted manually or electrically.
The flow rate of the hot air blower 42 is 20000-3The pressure is 800-1200 daPa. The length of the hot air drying section is 6-10m, but is not limited thereto.
As a better embodiment of the present invention, as shown in FIG. 5, the annealing furnace is provided with at least 7 sets of plate thermometers, at least 3 sets of plate thermometers are installed in the heating mechanism, at least 2 sets of plate thermometers are installed in the air cooling mechanism, at least 1 set of plate thermometers are installed at the entrance of the water cooling mechanism, and at least 1 set of plate thermometers are installed in the drying mechanism.
Specifically, the length of the annealing furnace is 200-240m, the transmission speed of the stainless steel band is 160-220m/min, and the annealing furnace is provided with at least 7 sets of plate thermometers, including a first plate thermometer, a second plate thermometer, a third plate thermometer, a fourth plate thermometer, a fifth plate thermometer, a sixth plate thermometer and a seventh plate thermometer;
the first plate temperature meter is arranged at a position 90-100m away from the inlet of the annealing furnace, the installation position is an area A shown in figure 3, and the first plate temperature meter is used for controlling the temperature at 580-620 ℃ to realize the heating control in the first stage;
the second plate temperature meter is arranged at a position which is 115-125m away from the inlet of the annealing furnace, and the installation position is a region B shown in figure 3, and is used for controlling the temperature at 1080 ℃ to realize the heating control of the second stage;
the third plate thermometer is arranged at the position of 145m away from the inlet of the annealing furnace, the installation position is a region C shown in figure 3 and is used for controlling the temperature at 1100-1160 ℃ so as to realize the heating control of the third stage;
the fourth plate thermometer is arranged at a position which is 150-;
the fifth plate thermometer is arranged at a position of 188m away from the inlet of the annealing furnace, the installation position is a region E shown in FIG. 3, and the fifth plate thermometer is used for controlling the temperature at 460 ℃ of 400 and realizing the air cooling control of the second stage;
the sixth plate thermometer is arranged at a position 200-210m away from the inlet of the annealing furnace, and the installation position is a region F shown in figure 3 and used for controlling the temperature to be between room temperature and 180 ℃ so as to realize water cooling control;
the seventh plate thermometer is arranged at a position 220m away from the inlet of the annealing furnace, and the installation position is a region G shown in figure 3, and is used for controlling the temperature to be between room temperature and 70 ℃ to realize drying control.
The utility model discloses a set for the position that the board thermometer arranged, the actual temperature of measurement steel band that it can be accurate to adjust furnace temperature according to the actual temperature of steel band and set for and speed settlement, guarantee the correct execution of thermal treatment technology, ensure that steel band mechanical properties is stable.
The fourth plate thermometer and the fifth plate thermometer are both arranged in an air cooling section of the annealing furnace, and in the air cooling section between the fourth plate thermometer and the fifth plate thermometer, the cooling rate of the stainless steel band is more than 50 ℃/s, so that the phenomenon of intercrystalline sensitization of the stainless steel band can be avoided.
The second plate thermometer and the third plate thermometer are both arranged in the heating section of the annealing furnace, the heating speed of the stainless steel band is maintained at 8-12 ℃/s in the heating section between the fourth plate thermometer and the fifth plate thermometer, dynamic recrystallization of all crystal phase tissues is ensured, and the stress reaches a stable value.
In conclusion, through the annealing treatment of the annealing furnace, the finished stainless steel band comprises the following components in percentage by weight:
0.01-0.05% of C, 6.0-9.5% of Ni, 16.5-20.0% of Cr, 0.1-3.0% of Mn, 0.01-0.2% of Cu, 0.15-1.0% of Si, 0.01-0.2% of P, 0.01-0.1% of S, 0.02-0.15% of N, and the balance of Fe and inevitable impurities.
Specifically, 0.01-0.05% of C and 0.15-1.0% of Si can promote austenite formation, stabilize austenite structure, improve the strength of the stainless steel, obtain good forming performance and be suitable for a cold rolling process. And by matching with Mn0.1-3.0% and Ni 6.0-9.5%, austenite can be stabilized, the mechanical property of the stainless steel band can be improved, the forming property of the stainless steel band can be improved, and the method is suitable for a cold rolling process and lays a foundation for obtaining a good plate type subsequently. The stainless steel strip contains 16.5-20.0% of Cr, so that the stainless steel strip has good corrosion resistance. The stainless steel strip contains 0.02-0.15% of N, austenite can be stabilized, and meanwhile, the strength and the corrosion resistance of the stainless steel strip are improved. 0.01-0.2% of Cu, and can reduce the stacking fault energy of an austenite phase and improve the plasticity and the forming performance of the stainless steel band.
Preferably, the stainless steel strip finished product prepared by the cold rolling method comprises the following components in percentage by weight:
0.03-0.04% of C, 7.0-9.0% of Ni, 17.5-19.0% of Cr, 0.5-2.0% of Mn, 0.02-0.08% of Cu, 0.40-0.80% of Si, 0.02-0.05% of P, 0.01-0.05% of S, 0.02-0.06% of N, and the balance of Fe and inevitable impurities.
The mechanical properties of the stainless steel band finished product are as follows:
| item | Numerical value |
| Thickness of | 0.3-3mm |
| Yield strength | 300-350MPa |
| Tensile strength | 700-750MPa |
| Elongation of stretching | 60-70％ |
| Hardness of | 170-190HV |
| Surface roughness | 0.15-0.25μm |
The invention will be further illustrated by the following specific examples
The preparation method of the stainless steel comprises the following steps:
1. selecting a stainless steel strip blank with a certain thickness;
2. coiling the stainless steel strip blank;
3. the rolled stainless steel band blanks are transmitted to a laser welding machine through an inlet loop, and laser welding is carried out on different rolled stainless steel band blanks;
4. carrying out first cold rolling on the stainless steel strip blank subjected to laser welding through a first cold rolling mill;
5. carrying out second-pass cold rolling on the stainless steel strip blank subjected to the first-pass cold rolling through a second cold rolling mill;
6. carrying out third cold rolling on the stainless steel strip blank subjected to the second cold rolling through a third cold rolling mill;
7. carrying out fourth cold rolling on the stainless steel strip blank subjected to the third cold rolling through a fourth cold rolling mill;
8. carrying out fifth-pass cold rolling on the stainless steel strip blank subjected to the fourth-pass cold rolling through a fifth cold rolling mill;
9. carrying out sixth cold rolling on the stainless steel strip blank subjected to the fifth cold rolling through a sixth cold rolling mill;
10. cleaning the stainless steel strip blank subjected to the sixth cold rolling;
11. conveying the cleaned stainless steel strip blank to the next procedure through an outlet loop, and drying and cleaning to obtain a semi-finished stainless steel strip;
12. and (3) annealing the dried semi-finished stainless steel band in an annealing furnace, wherein the parameters of the annealing furnace are set as shown in the table I:
13. and electrolyzing, pickling, straightening and flattening the annealed stainless steel strip semi-finished product to obtain a stainless steel strip finished product.
(II) in the first table, the parameters of the annealing furnace are set as follows:
and (III) the properties of the finished stainless steel band are as follows:
(IV) the annealing furnace consumes the following energy sources:
| item | Prior Art | Example 1 | Example 2 | Example 3 |
| Consumption of natural gas | 35-45J/m3 | 26J/m3 | 28J/m3 | 29J/m3 |
To sum up, the utility model discloses annealing stove, simple structure simplifies annealing process, and the stainless steel band finished product mechanical properties who makes is good, and the roughness is good, and hardness is even, and roughness is little, and the outward appearance is bright high-grade, effectively avoids taking place disconnected area, the material is poor, hardness is uneven, surface quality is poor, surface fish tail scheduling problem. Moreover, the annealing furnace consumes less heat energy, and has remarkable energy-saving effect.
The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the invention, which is defined by the claims and their equivalents.
Claims (10)
1. The annealing furnace for the stainless steel strip is characterized by comprising a heating mechanism, an air cooling mechanism, a water cooling mechanism and a drying mechanism, wherein the heating mechanism comprises an inlet sealing section, a preheating zone, a heating zone and an outlet sealing section, the preheating zone and the heating zone are packaged into a closed mechanism by the inlet sealing section and the outlet sealing section, the heating zone is provided with a heating nozzle, and flame is sprayed out by the heating nozzle to heat the stainless steel strip and generate smoke;
the air cooling mechanism sequentially cools the stainless steel strip through air;
the water cooling mechanism comprises a spraying box, and cooling water and compressed air are introduced into the spraying box;
the drying mechanism comprises an air heater, and the heat source of the air heater is the smoke and the waste heat generated by the heating mechanism;
the annealing furnace is provided with at least 7 sets of plate thermometers, at least 3 sets of plate thermometers are installed in the heating mechanism, at least 2 sets of plate thermometers are installed in the air cooling mechanism, at least 1 set of plate thermometers are installed at an inlet of the water cooling mechanism, and at least 1 set of plate thermometers are installed in the drying mechanism.
2. The annealing furnace for stainless steel strips according to claim 1, wherein the annealing furnace has a length of 200-;
the first plate thermometer is arranged at a position 90-100m away from the inlet of the annealing furnace and is used for controlling the temperature at 580-620 ℃;
the second plate thermometer is arranged at a position which is 115-125m away from the inlet of the annealing furnace and is used for controlling the temperature to be 1080 ℃;
the third plate thermometer is arranged at the position of 135-145m away from the inlet of the annealing furnace and is used for controlling the temperature at 1100-1160 ℃;
the fourth plate thermometer is arranged at the position which is 150-155m away from the inlet of the annealing furnace and is used for controlling the temperature at 950-980 ℃;
the fifth plate thermometer is arranged at a position 180-188m away from the inlet of the annealing furnace and is used for controlling the temperature at 400-460 ℃;
the sixth plate thermometer is arranged at a position 200-210m away from the inlet of the annealing furnace and is used for controlling the temperature to be between room temperature and 180 ℃;
the seventh plate thermometer is arranged at a position which is 220m away from the inlet of the annealing furnace and is used for controlling the temperature to be between room temperature and 70 ℃.
3. The annealing furnace for stainless steel strip according to claim 2, wherein the fourth plate temperature gauge and the fifth plate temperature gauge are both disposed in an air cooling section of the annealing furnace, and the cooling rate of the stainless steel strip is greater than 50 ℃/s in the air cooling section between the fourth plate temperature gauge and the fifth plate temperature gauge;
the second plate temperature meter and the third plate temperature meter are both arranged at the heating section of the annealing furnace, the heating section between the fourth plate temperature meter and the fifth plate temperature meter, and the heating rate of the stainless steel band is maintained at 8-12 ℃/s.
4. The annealing furnace for stainless steel strip according to claim 1, wherein said heating zones comprise a first heating zone, a second heating zone, a third heating zone, a fourth heating zone, a fifth heating zone, a sixth heating zone, a seventh heating zone, an eighth heating zone, a ninth heating zone, and a tenth heating zone;
the number of the burners of the first heating subarea is 10-16, and the power of the burners is 6500 and 7000 kw;
the number of the burners of the second heating subarea is 10-16, and the burner power is 6300-;
the number of the burners of the third heating subarea is 10-16, and the power of the burners is 5400-6000 kw;
the number of the burners of the fourth heating subarea is 10-16, and the power of the burners is 4800-;
the number of the burners of the fifth heating subarea is 10-16, and the power of the burners is 4000-;
the number of the burners of the sixth heating subarea is 10-16, and the power of the burners is 3500-4000 kw;
the number of the burners of the seventh heating subarea is 10-16, and the power of the burners is 2500-;
the number of the burners of the eighth heating subarea is 10-16, and the power of the burners is 1400-2000 kw;
the number of the burners of the ninth heating subarea is 10-16, and the power of the burners is 1200-1800 kw;
the number of the burners of the tenth heating subarea is 10-16, and the burner power is 1200-1800 kw.
5. The annealing furnace for stainless steel strip according to claim 4, wherein said heating zone is further provided with a combustion fan and an exhaust fan, and the flow rate of said combustion fan is 60000-68000m3The pressure is 12-18KPa, and the air inlet temperature is 20-30 ℃;
the flow rate of the exhaust fan is 180000-210000m3H, pressure 2-3KPa, outThe air temperature is 150-250 ℃.
6. The annealing furnace for stainless steel strip according to claim 5, wherein the top of said heating zone is provided with ceramic fiber modules having a porosity of 93-98% and a thickness of 200-500 mm.
7. The annealing furnace for stainless steel strip according to claim 1, wherein said air cooling mechanism comprises a first air cooling unit, a second air cooling unit, a third air cooling unit, a fourth air cooling unit, a fifth air cooling unit, a sixth air cooling unit, a seventh air cooling unit, and an eighth air cooling unit;
the smoke discharge flow of the first air cooling unit and the second air cooling unit is 180000-3The exhaust temperature of the exhaust gas is 180-200 ℃, and the pressure is 140-160 daPa;
the exhaust gas flow rates of the third air cooling unit and the fourth air cooling unit are 250000 and 280000m3The exhaust temperature of the exhaust gas is 110-140 ℃, and the pressure is 140-160 daPa;
the smoke discharge flow rates of the fifth air cooling unit and the sixth air cooling unit are 240000-260000m3The exhaust temperature of the exhaust gas is 80-100 ℃, and the pressure is 140-;
the exhaust gas flow rates of the seventh air cooling unit and the eighth air cooling unit are 230000-250000m3The exhaust temperature of the exhaust gas is 60-85 ℃, and the pressure is 140-160 daPa.
8. The annealing furnace for stainless steel strip according to claim 7, wherein the flow rate of exhaust fumes, the exhaust temperature of exhaust fumes, and the pressure are the same in the first air-cooling unit and the second air-cooling unit;
the third air cooling unit and the fourth air cooling unit have the same smoke discharge flow, the same smoke discharge temperature and the same smoke discharge pressure;
the flow rate of the smoke discharged by the fifth air cooling unit and the sixth air cooling unit is the same as the discharge temperature and the pressure of the smoke discharged by the sixth air cooling unit;
the flow rate of the exhaust smoke, the discharge temperature of the exhaust smoke and the pressure of the exhaust smoke of the seventh air cooling unit are the same as those of the exhaust smoke of the eighth air cooling unit.
9. The annealing furnace for stainless steel strip according to claim 7, wherein the first air cooling unit, the second air cooling unit, the third air cooling unit, the fourth air cooling unit, the fifth air cooling unit, the sixth air cooling unit, the seventh air cooling unit and the eighth air cooling unit are provided with pressure regulators;
the outlet of air cooling mechanism is equipped with infrared pyrometer, infrared pyrometer is connected with pressure regulator for according to the temperature of the stainless steel band that infrared pyrometer detected, come the automatic pressure of revising first air cooling unit, second air cooling unit, third air cooling unit, fourth air cooling unit, fifth air cooling unit, sixth air cooling unit, seventh air cooling unit and eighth air cooling unit through pressure regulator.
10. The annealing furnace for stainless steel strip according to claim 1, wherein the flow rate of cooling water introduced into said shower box is 15 to 25m3The flow rate of the introduced compressed air is 1200-1800Nm3/h；
The flow rate of the hot air blower is 20000-3The pressure is 800-1200 daPa.
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|---|---|---|---|
| CN201822272196.6U CN210261916U (en) | 2018-12-29 | 2018-12-29 | Annealing furnace for stainless steel band |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109628944A (en) * | 2018-12-29 | 2019-04-16 | 佛山市诚德新材料有限公司 | A kind of annealing and pickling system of stainless steel band |
| CN109652639A (en) * | 2018-12-29 | 2019-04-19 | 佛山市诚德新材料有限公司 | A kind of annealing furnace of stainless steel band |
| CN113587638A (en) * | 2021-06-28 | 2021-11-02 | 河钢股份有限公司 | Heating furnace and method for preparing hot-forming agricultural implement wear-resistant part |
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2018
- 2018-12-29 CN CN201822272196.6U patent/CN210261916U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109628944A (en) * | 2018-12-29 | 2019-04-16 | 佛山市诚德新材料有限公司 | A kind of annealing and pickling system of stainless steel band |
| CN109652639A (en) * | 2018-12-29 | 2019-04-19 | 佛山市诚德新材料有限公司 | A kind of annealing furnace of stainless steel band |
| CN109652639B (en) * | 2018-12-29 | 2024-02-09 | 佛山市诚德新材料有限公司 | Annealing furnace for stainless steel strip |
| CN113587638A (en) * | 2021-06-28 | 2021-11-02 | 河钢股份有限公司 | Heating furnace and method for preparing hot-forming agricultural implement wear-resistant part |
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