CN110923421A - Stress relieving process of precise stainless steel semi-hardness continuous furnace - Google Patents
Stress relieving process of precise stainless steel semi-hardness continuous furnace Download PDFInfo
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- CN110923421A CN110923421A CN201811094045.4A CN201811094045A CN110923421A CN 110923421 A CN110923421 A CN 110923421A CN 201811094045 A CN201811094045 A CN 201811094045A CN 110923421 A CN110923421 A CN 110923421A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
- B08B5/023—Cleaning travelling work
-
- 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
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/16—Unwinding or uncoiling
- B21C47/18—Unwinding or uncoiling from reels or drums
-
- 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
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/26—Special arrangements with regard to simultaneous or subsequent treatment of the material
-
- 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
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/34—Feeding or guiding devices not specially adapted to a particular type of apparatus
- B21C47/3433—Feeding or guiding devices not specially adapted to a particular type of apparatus for guiding the leading end of the material, e.g. from or to a coiler
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
- C21D9/563—Rolls; Drums; Roll arrangements
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/562—Details
- C21D9/564—Tension control
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
Abstract
The invention discloses a stress relieving process of a precise stainless steel semi-hardness continuous furnace, which comprises the following steps of: 1) the steel coil to be destressed is hung on a feeding trolley of the uncoiler in a preparation state by a travelling crane, and the steel coil is sent to an uncoiling mandrel by the trolley; 2) when the steel coil on the working uncoiler is to be finished to enter a coil changing state, attention needs to be paid to observing the tail part of the steel coil; 3) and the pinch roll of the steel strip after passing through the welding machine enters the No. 1 tension roll and then enters the No. 2 tension roll through the No. 1 tension roll and enters the high-pressure air knife blowing device. According to the stress removing process of the precise stainless steel semi-hardness continuous furnace, through the integral structure of the equipment, the residual stress and good flatness in a precise stainless steel strip can be completely eliminated, so that deformation cannot be generated during stamping in the electronic industry, and the utilization rate and yield of the product are improved.
Description
Technical Field
The invention relates to the technical field of machinery, in particular to a stress relieving process of a precision stainless steel semi-hardness continuous furnace.
Background
With the progress of society and the development of scientific technology, some traditional heat treatment processes cannot meet the requirement of stress relief of precision stainless steel bands. The traditional destressing process of the precise stainless steel strip adopts a bell-type furnace and a box-type furnace to carry out destressing heat treatment, and because the precise stainless steel strip is subjected to destressing heat treatment in a steel coil form, the phenomenon of uneven destressing of the inner ring and the outer ring of the steel coil is formed, namely the subsequent reprocessing of the precise stainless steel strip is influenced, and the straightness of the precise stainless steel strip is also deteriorated, so that the destressing process of the precise stainless steel semi-hardness continuous furnace is provided.
Disclosure of Invention
The invention aims to provide a stress relieving process of a precise stainless steel semi-hardness continuous furnace, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a stress relieving process of a precise stainless steel semi-hardness continuous furnace comprises the following steps:
1) the steel coil to be destressed is hung on a feeding trolley of an uncoiler in a preparation state by a crane, the steel coil is sent to an uncoiling mandrel by the trolley, the trolley returns to the original position, the uncoiler expands the uncoiling mandrel to tension the steel coil, the uncoiler is driven to move forward, the steel head of the steel coil is inserted into the lower end of a roll shaft of a No. 1 guide roll and the middle part of a No. 2 tension roll, then the steel coil is sent to a pinch roll behind the No. 2 tension roll, and an upper press roll of the pinch roll is pressed down, simultaneously, the uncoiler and the pinch roll are inching, the steel head is sent into the shearing machine, the bad part of the head of the steel strip is sheared, the head of the sheared steel strip is continuously inserted into the high-pressure air knife sweeping device and the seam welder, then starting an uncoiler and a pinch roll, inserting the head of the steel strip into the annealing furnace, the tension measuring roll, the tension roll No. 3 and the tension roll No. 4 in sequence, and finally starting a paper collecting machine to directly wind the steel strip packing paper on a reel of the paper collecting machine;
2) when the steel coil on the working uncoiler is to be finished to enter a coil changing state, attention is paid to observing the tail of the steel strip, when the thickness of the tail of the steel strip is uneven or irregular, the whole line stops running, a inching mode is adopted, the uncoiler is inched to enable the tail of the steel strip to enter the shearing machine, the tail of the steel strip with uneven thickness or irregular is sheared through the shearing machine, then the uncoiler is continued to be inched to enable the tail of the steel strip to enter the seam welding machine, then a reel without the steel strip is unloaded, a new steel coil is placed on the feeding trolley through a crane, the feeding trolley is operated, the steel coil is placed on a production center line on a mandrel of the uncoiler, a mandrel of the uncoiler is tensioned, a press-down uncoiler roller is pressed, the uncoiler and a pinch roller are inching to enable the head of the new steel strip to also enter the seam welding machine, two heads and two tails are manually adjusted to, placing the steel strip into a pinch roll behind a welding machine, and placing the inlet section of the production line in a normal operation working state;
3) the steel strip enters a No. 1 tension roller through a pinch roller of a welding machine, then enters a No. 2 tension roller through the No. 1 tension roller and enters a high-pressure air knife blowing device, the high-pressure air knife can remove dust on the surface of the steel strip and trace moisture on the steel strip, and the steel strip with the dust on the surface and the trace moisture removed enters a stress removing furnace to complete a heat treatment process and a cooling process;
4) after passing through a tension measuring roller, the steel strip which is subjected to the heat treatment process and the cooling process enters a No. 3 tension roller and a No. 4 tension roller, the No. 4 tension roller runs as a main speed reference of the whole production line, the full-line running speed is controlled, and after passing through the No. 4 tension roller, the steel strip is finally wound by a winding machine;
5) and when the steel belt is wound, the production line stops running, the finished product after the steel belt is wound is unloaded from the core shaft of the winding machine by the coil unloading trolley, manually packaged, hoisted by a crane, and loaded into the sleeve by the upper sleeve device, and then new winding operation is started again.
Preferably, the annealing furnace in the step 1 is divided into a stress furnace and a cooling furnace.
Preferably, the total length of the heating zone of the stress relief annealing furnace in the heat treatment process in the step 3 is 10 meters, the heating control is carried out in four zones, the temperature of each zone in the furnace is 600 ℃, the furnace temperature control precision is +/-1 ℃, and the steel strip is cooled in a cooling furnace after being heated in the furnace.
Preferably, the cooling speed of the steel strip in the cooling furnace is more than 40 ℃/S, the steel strip reaches the tension measuring roller through the outlet of the furnace after the temperature of the steel strip is cooled to be below 60 ℃, and the tension of the steel strip in the furnace is 80N/mm 2.
Compared with the prior art, the invention has the beneficial effects that: according to the stress removing process of the precise stainless steel semi-hardness continuous furnace, through the integral structure of the equipment, the residual stress and good flatness of the precise stainless steel strip can be completely eliminated, so that the precise stainless steel produced by the stress removing process can not deform during stamping in the electronic industry, the utilization rate and yield of the product are improved, the process can be widely applied, and good economic benefits are generated.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a stress relieving process of a precise stainless steel semi-hardness continuous furnace comprises the following steps:
1) the steel coil to be destressed is hung on a feeding trolley of an uncoiler in a preparation state by a crane, the steel coil is sent to an uncoiling mandrel by the trolley, the trolley returns to the original position, the uncoiler expands the uncoiling mandrel to tension the steel coil, the uncoiler is inching in the forward direction, the steel head of the steel coil is inserted into the lower end of a roll shaft of a No. 1 guide roll and the middle part of a No. 2 tension roll, then the steel coil is sent to a pinch roll behind the No. 2 tension roll, an upper compression roll of the pinch roll is pressed down, the uncoiler and the pinch roll are inching at the same time, the steel head is sent to a shearing machine, bad parts of the head of the steel coil are sheared, the head of the sheared steel coil is continuously inserted into a high-pressure air knife sweeping device and a seam welder, then the uncoiler and the pinch roll are started, the head of the steel coil is sequentially inserted into an annealing furnace, a tension measuring roll, a No. 3 tension roll and a, finally, starting the paper collecting machine, and directly winding the steel strip packing paper on a reel of the paper collecting machine;
2) when the steel coil on the working uncoiler is to be finished to enter a coil changing state, attention is paid to observing the tail of the steel strip, when the thickness of the tail of the steel strip is uneven or irregular, the whole line stops running, a inching mode is adopted, the uncoiler is inched to enable the tail of the steel strip to enter the shearing machine, the tail of the steel strip with uneven thickness or irregular is sheared through the shearing machine, then the uncoiler is continued to be inched to enable the tail of the steel strip to enter the seam welding machine, then a reel without the steel strip is unloaded, a new steel coil is placed on the feeding trolley through a crane, the feeding trolley is operated, the steel coil is placed on a production center line on a mandrel of the uncoiler, a mandrel of the uncoiler is tensioned, a press-down uncoiler roller is pressed, the uncoiler and a pinch roller are inching to enable the head of the new steel strip to also enter the seam welding machine, two heads and two tails are manually adjusted to, placing the steel strip into a pinch roll behind a welding machine, and placing the inlet section of the production line in a normal operation working state;
3) the steel strip enters a No. 1 tension roller after passing through a welding machine, then enters a No. 2 tension roller through the No. 1 tension roller, enters a high-pressure air knife blowing device, a high-pressure air knife can remove dust on the surface of the steel strip and trace moisture on the steel strip, the steel strip with the dust on the surface and the trace moisture removed enters a stress removal furnace to complete a heat treatment process and a cooling process, the total length of a heating zone of the stress removal annealing furnace in the heat treatment process in the step 3 is 10 meters, the heating control is carried out in four zones, the temperature of each zone in the furnace is 600 ℃, the furnace temperature control precision is +/-1 ℃, the steel strip enters a cooling furnace to be cooled after being heated in the furnace, the cooling rate of the steel strip in the cooling furnace is higher than 40 ℃/S, the steel strip reaches a tension measuring roller through a furnace outlet after the temperature of2；
4) After passing through a tension measuring roller, the steel strip which is subjected to the heat treatment process and the cooling process enters a No. 3 tension roller and a No. 4 tension roller, the No. 4 tension roller runs as a main speed reference of the whole production line, the full-line running speed is controlled, and after passing through the No. 4 tension roller, the steel strip is finally wound by a winding machine;
5) and when the steel belt is wound, the production line stops running, the finished product after the steel belt is wound is unloaded from the core shaft of the winding machine by the coil unloading trolley, manually packaged, hoisted by a crane, and loaded into the sleeve by the upper sleeve device, and then new winding operation is started again.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A stress relieving process of a precise stainless steel semi-hardness continuous furnace is characterized by comprising the following steps: the method comprises the following steps:
1) the steel coil to be destressed is hung on a feeding trolley of an uncoiler in a preparation state by a crane, the steel coil is sent to an uncoiling mandrel by the trolley, the trolley returns to the original position, the uncoiler expands the uncoiling mandrel to tension the steel coil, the uncoiler is driven to move forward, the steel head of the steel coil is inserted into the lower end of a roll shaft of a No. 1 guide roll and the middle part of a No. 2 tension roll, then the steel coil is sent to a pinch roll behind the No. 2 tension roll, and an upper press roll of the pinch roll is pressed down, simultaneously, the uncoiler and the pinch roll are inching, the steel head is sent into the shearing machine, the bad part of the head of the steel strip is sheared, the head of the sheared steel strip is continuously inserted into the high-pressure air knife sweeping device and the seam welder, then starting an uncoiler and a pinch roll, inserting the head of the steel strip into the annealing furnace, the tension measuring roll, the tension roll No. 3 and the tension roll No. 4 in sequence, and finally starting a paper collecting machine to directly wind the steel strip packing paper on a reel of the paper collecting machine;
2) when the steel coil on the working uncoiler is to be finished to enter a coil changing state, attention is paid to observing the tail of the steel strip, when the thickness of the tail of the steel strip is uneven or irregular, the whole line stops running, a inching mode is adopted, the uncoiler is inched to enable the tail of the steel strip to enter the shearing machine, the tail of the steel strip with uneven thickness or irregular is sheared through the shearing machine, then the uncoiler is continued to be inched to enable the tail of the steel strip to enter the seam welding machine, then a reel without the steel strip is unloaded, a new steel coil is placed on the feeding trolley through a crane, the feeding trolley is operated, the steel coil is placed on a production center line on a mandrel of the uncoiler, a mandrel of the uncoiler is tensioned, a press-down uncoiler roller is pressed, the uncoiler and a pinch roller are inching to enable the head of the new steel strip to also enter the seam welding machine, two heads and two tails are manually adjusted to, placing the steel strip into a pinch roll behind a welding machine, and placing the inlet section of the production line in a normal operation working state;
3) the steel strip enters a No. 1 tension roller through a pinch roller of a welding machine, then enters a No. 2 tension roller through the No. 1 tension roller and enters a high-pressure air knife blowing device, the high-pressure air knife can remove dust on the surface of the steel strip and trace moisture on the steel strip, and the steel strip with the dust on the surface and the trace moisture removed enters a stress removing furnace to complete a heat treatment process and a cooling process;
4) after passing through a tension measuring roller, the steel strip which is subjected to the heat treatment process and the cooling process enters a No. 3 tension roller and a No. 4 tension roller, the No. 4 tension roller runs as a main speed reference of the whole production line, the full-line running speed is controlled, and after passing through the No. 4 tension roller, the steel strip is finally wound by a winding machine;
5) and when the steel belt is wound, the production line stops running, the finished product after the steel belt is wound is unloaded from the core shaft of the winding machine by the coil unloading trolley, manually packaged, hoisted by a crane, and loaded into the sleeve by the upper sleeve device, and then new winding operation is started again.
2. The stress relieving process of the precise stainless steel semi-hardness continuous furnace according to claim 1, which is characterized in that: the annealing furnace in the step 1 is divided into a stress furnace and a cooling furnace.
3. The stress relieving process of the precise stainless steel semi-hardness continuous furnace according to claim 1 or 2, which is characterized in that: the total length of the heating zone of the stress relief annealing furnace in the heat treatment process in the step 3 is 10 meters, the heating control is carried out in four zones, the temperature of each zone in the furnace is 600 ℃, the furnace temperature control precision is +/-1 ℃, and the steel strip is cooled in a cooling furnace after being heated in the furnace.
4. The stress relieving process of the precise stainless steel semi-hardness continuous furnace according to claim 3, which is characterized in that: the cooling speed of the strip steel in the cooling furnace is more than 40 ℃/S, the strip steel reaches the tension measuring roller through the outlet of the furnace after being cooled to the temperature below 60 ℃, and the tension of the strip steel in the furnace is 80N/mm2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811094045.4A CN110923421A (en) | 2018-09-19 | 2018-09-19 | Stress relieving process of precise stainless steel semi-hardness continuous furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811094045.4A CN110923421A (en) | 2018-09-19 | 2018-09-19 | Stress relieving process of precise stainless steel semi-hardness continuous furnace |
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| CN110923421A true CN110923421A (en) | 2020-03-27 |
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| CN201811094045.4A Pending CN110923421A (en) | 2018-09-19 | 2018-09-19 | Stress relieving process of precise stainless steel semi-hardness continuous furnace |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101220409A (en) * | 2007-12-01 | 2008-07-16 | 徐建永 | Horizontal continuous unmuffled light annealing equipment of stainless steel band |
| CN101307382A (en) * | 2008-06-06 | 2008-11-19 | 徐建永 | Vertical continuous non-muffle bright annealing equipment for stainless steel band |
| CN102409347A (en) * | 2011-12-05 | 2012-04-11 | 佛山南方广恒钢铁有限公司 | Continuous annealing and darkening integrated process for steel coil and production line |
| CN102773257A (en) * | 2012-07-11 | 2012-11-14 | 中冶南方工程技术有限公司 | Hot-rolled austenitic stainless steel band steel annealing pickling line inlet device and annealing process thereof |
| CN204022904U (en) * | 2014-08-06 | 2014-12-17 | 中冶南方工程技术有限公司 | A kind of stainless steel belt clean annealing unit |
| CN205774666U (en) * | 2016-05-31 | 2016-12-07 | 本钢板材股份有限公司 | A kind of continuous annealing unit of cold-rolled products |
| CN108220566A (en) * | 2016-12-21 | 2018-06-29 | 宝山钢铁股份有限公司 | Compact fine grain high-strength plate output strip line flexible manufacturing method |
-
2018
- 2018-09-19 CN CN201811094045.4A patent/CN110923421A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101220409A (en) * | 2007-12-01 | 2008-07-16 | 徐建永 | Horizontal continuous unmuffled light annealing equipment of stainless steel band |
| CN101307382A (en) * | 2008-06-06 | 2008-11-19 | 徐建永 | Vertical continuous non-muffle bright annealing equipment for stainless steel band |
| CN102409347A (en) * | 2011-12-05 | 2012-04-11 | 佛山南方广恒钢铁有限公司 | Continuous annealing and darkening integrated process for steel coil and production line |
| CN102773257A (en) * | 2012-07-11 | 2012-11-14 | 中冶南方工程技术有限公司 | Hot-rolled austenitic stainless steel band steel annealing pickling line inlet device and annealing process thereof |
| CN204022904U (en) * | 2014-08-06 | 2014-12-17 | 中冶南方工程技术有限公司 | A kind of stainless steel belt clean annealing unit |
| CN205774666U (en) * | 2016-05-31 | 2016-12-07 | 本钢板材股份有限公司 | A kind of continuous annealing unit of cold-rolled products |
| CN108220566A (en) * | 2016-12-21 | 2018-06-29 | 宝山钢铁股份有限公司 | Compact fine grain high-strength plate output strip line flexible manufacturing method |
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