CN111363878A - Production control method for edge crack defect of hot rolled steel strip - Google Patents
Production control method for edge crack defect of hot rolled steel strip Download PDFInfo
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- CN111363878A CN111363878A CN201811599962.8A CN201811599962A CN111363878A CN 111363878 A CN111363878 A CN 111363878A CN 201811599962 A CN201811599962 A CN 201811599962A CN 111363878 A CN111363878 A CN 111363878A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
Abstract
The invention is suitable for the technical field, and provides a production control method for the edge crack defect of a hot-rolled steel strip, which comprises the following steps of; classifying edge cracks, controlling the reasons of different types of edge cracks and various types of edge cracks; according to the invention, according to the difference of macroscopic and microscopic characteristics of different types of edge cracks, the actual production condition is combined with scientific experiments and theories, firstly, edge cracks caused by various complex problems are classified, then, the mechanism of the generation of different types of edge cracks is traced back to a process control point, and finally, a specific control method is formulated; secondly, representing the classification of the edge cracks in a picture form according to the defect appearance and detection characteristics of the edge cracks and matching with an explanation, and helping technicians to quickly analyze and judge through the more vivid and more specific picture-text form; and finally, a key control method of the corresponding process is determined according to the formation reasons of the different types of edge cracks, and the key points are comprehensively controlled and prevented in advance, so that the purpose of preventing the edge cracks from being generated in a normal production manner is achieved.
Description
Technical Field
The invention belongs to the technical field of hot rolled steel strip production, and particularly relates to a production control method for edge crack defects of a hot rolled steel strip.
Background
The edge crack refers to the macroscopic defects of irregularity and edge defect generated on the edge of a steel strip in the production process of a hot-rolled wide strip or a hot-rolled narrow strip, and is the quality defect of the production process commonly existing in hot-rolled steel strip production enterprises. The existence of the edge crack defect often causes that the production can not be smoothly carried out, the delivery can not be carried out according to the width size required by the order of the customer, the delivery date is influenced, the friction between supply and demand is caused, great quality loss is caused for production enterprises, the smooth operation of the production of the enterprises is influenced, and the market image of the enterprises is also influenced.
Generally, users of hot-rolled wide belts and narrow belts determine the specification size of an order contract according to the width of a manufactured workpiece and a hot-rolled enterprise, the width is generally not changeable, but when edge crack defects occur in production, the problem that the users cannot use the hot-rolled wide belts and the hot-rolled narrow belts due to the defects of edges is caused, and the contract delivery period is prolonged; meanwhile, once edge cracks appear in production enterprises, the edge cracks often appear in batches, and great quality loss is caused. The formation reasons of the edge crack are more, a plurality of key points of a plurality of processes are involved, and the control is performed according to which aspect, the problem point of the edge crack must be found firstly, and comprehensive measures are made to control, so that the edge crack can be rapidly solved or prevented in advance.
At present, different steel rolling manufacturers of steel rolling production enterprises have different cognition on edge cracks, namely the edge cracks of the same manufacturer in different periods are different, or the edge cracks of different production lines in the same period are different, so that the edge cracks are often greatly diverged in the formation reason, the opinions between an upper process and a lower process are difficult to be unified, the prevention of the edge cracks is usually controlled, another point is ignored, the edge cracks are repeatedly caused, the comprehensive, planned and targeted control cannot be achieved, the production passivity is high, and the larger quality loss is caused.
Because of the generation of edge cracks, the method not only involves converter smelting, molten steel alloying, deoxidation, argon blowing and continuous casting operation and process control in a steel-making process, but also involves the influence of heating temperature in a steel rolling process and various devices in a rolling process.
Disclosure of Invention
The invention provides a production control method for edge crack defects of hot rolled steel strips, and aims to solve the problems that at present, different steel rolling manufacturers of steel rolling manufacturers have different cognition on edge cracks, namely the edge crack causes of the same manufacturer in different periods are different, or the edge crack causes of different production lines in the same period are different, so that the edge crack causes are often diverged greatly, opinions between an upper process and a lower process are difficult to be unified, the prevention of the edge crack is usually controlled by neglecting another point, the edge crack is caused to appear repeatedly, the comprehensive, planned and targeted control cannot be realized, the production passivity is high, and the quality loss is high.
The invention is realized in such a way that a production control method for the edge crack defect of a hot rolled steel strip is characterized by comprising the following steps:
(1) classifying edge cracks: according to the analysis and research of the edge crack defect characteristics and the formation reasons, the edge cracks can be divided into the following five types: high gas content, abnormal heating temperature, uneven deformation, casting blank surface defect and equipment scratch.
(2) Reasons for heterogeneous edge cracks:
a, the gas content is high and comprises poor deoxidation, high air and protective gas content and condensed water steam mixing;
b, the abnormal heating temperature comprises overhigh heating temperature and overlong residence time of a high-temperature area;
c, the uneven deformation comprises mismatching of the size of a casting blank and the width of a finished product, uneven heating temperature and internal quality defects of the casting blank;
d, the defects on the surface of the casting blank comprise corner cracks, mechanical scratches and deep vibration marks of the corner parts of the casting blank;
e, scratching the equipment comprises scratching the casting machine equipment and the rolling equipment;
(3) controlling various edge cracks:
control of the gas content is high: a, reducing the times of converter over-blowing and converter reversing and ensuring the end point carbon; b, adjusting the dosage of the deoxidizer or adjusting the type of deoxidized alloy; c, strongly deoxidizing by adopting an aluminum wire; d, controlling air and protective gas; e, controlling water vapor;
control of the heating temperature abnormality: a, controlling the heating temperature; b, controlling the residence time of the high-temperature zone;
control of the non-uniform deformation: a, increasing the width of a casting blank, producing the casting blanks with multiple specifications, and rolling a steel belt with larger width by using the large-specification casting blank; b, controlling the temperature field to be less than 30 ℃; c, controlling chemical components, and desulfurizing if carbon is required to avoid a crystal covering region;
controlling the surface defects of the casting blank: a, controlling the content of aluminum and nitrogen; b, controlling the temperature of the straightening area; c, controlling the radian and the opening of the casting machine; d, timely feeding grease to the sector section; e, cleaning the oxidation slag and the cold steel in time; f, adjusting the position of the steel belt to prevent the steel belt from deviating;
controlling the equipment scratch: a preventing the grease dispenser from stopping feeding grease; b, cleaning oxidation slag and cold steel in time; c, using a side guide plate with a hydraulic adjusting device; d, uniformly cooling the roller; e, the bearing is periodically checked, cleaned and greased, so that the expansion of the bearing is reduced; f, adjusting the torque of the loop motor and controlling the rolling speed.
The invention also provides a preferable mode, air and protective gas are controlled in the control of high gas content, argon is adopted for protection, the butt joint of the sealing gaps of the tundish is tight in sealing, and meanwhile, the argon guarantees about 0.3MPa of pressure.
The invention also provides the preferable method, the steam is controlled in the control of high gas content, the alloy material, the covering agent and the covering slag are dried, the water content is less than 0.5%, the refractory materials of the steel ladle, the tundish and the casting system are dried, and the baking at 950-1050 ℃ is ensured for not less than 4 hours.
The invention also provides the preferable mode, the residence time of the high-temperature area is controlled in the control of the abnormal heating temperature, and the low-carbon steel is controlled to be about 30 min.
The invention also provides a preferable mode, the chemical components are controlled in the control of the uneven deformation, the carbon avoids a peritectic region, the sulfur is controlled to be below 0.020%, and the oxygen content of plain carbon steel is controlled to be below 80 ppm.
The invention also provides the preferable method, the content of aluminum and nitrogen is controlled in the control of the surface defects of the casting blank, the content of aluminum is controlled to be less than or equal to 0.020%, and the content of nitrogen is controlled to be less than or equal to 50 ppm.
The invention also provides the optimization, wherein the temperature of the straightening area is controlled in the control of the surface defects of the casting blank, and the temperature of the straightening area is more than or equal to 900 ℃.
The invention also provides the preferable selection, the radian and the opening of the casting machine are controlled in the control of the surface defects of the casting blank, the radian is controlled to be less than or equal to +/-0.3 mm, and the opening degree is controlled to be less than or equal to +/-0.2 mm.
Compared with the prior art, the invention has the beneficial effects that: according to the production control method for the edge crack defect of the hot rolled steel strip, the actual production condition is combined with scientific experiments and theories according to the difference of macroscopic and microscopic characteristics of different types of edge cracks, firstly, the edge cracks caused by various complex problems are classified, then, the process control point is traced according to the mechanism of the edge crack generation of different types, and finally, a specific control method is formulated; secondly, representing the classification of the edge cracks in a picture form according to the defect appearance and detection characteristics of the edge cracks and matching with an explanation, and helping technicians to quickly analyze and judge through the more vivid and more specific picture-text form; finally, key control methods of corresponding procedures are customized according to the formation reasons of different types of edge cracks, the aim of smooth production and prevention of edge cracks is achieved by comprehensively controlling and preventing the key points, the essence is that the defect of edge cracks is quickly and effectively solved through the current situation of field actual production, scientific experiments, theoretical analysis and research and repeated practice verification of production.
Drawings
FIG. 1 is a schematic diagram of a timing structure according to the present invention;
FIG. 2 is a schematic diagram of the edge crack classification structure according to the present invention;
FIG. 3 is a schematic diagram of a gas content high classification scheme according to the present invention;
FIG. 4 is a schematic diagram illustrating a classification structure of abnormal heating temperature according to the present invention;
FIG. 5 is a schematic diagram of the classification structure of the uneven deformation according to the present invention;
FIG. 6 is a schematic diagram of a classification structure of surface defects of a casting blank according to the present invention;
FIG. 7 is a schematic diagram of a device scratch classification structure according to the present invention;
FIG. 8 is a structural diagram of a classification structure of a control method according to the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 8, the present invention provides a method for controlling edge crack defect in hot rolled steel strip, comprising:
the first embodiment;
(1) classifying edge cracks: according to analysis and research of edge crack defect characteristics and formation reasons, the edge crack is found to be the time when the gas content is high;
(2) reasons for heterogeneous edge cracks: the reasons for the high gas content are mainly three: firstly, poor deoxidation is caused, which is a common reason causing edge crack defects of low-carbon steel hot rolled steel strips, and mainly because the carbon content at the converter molten steel blowing end point is low, the carbon oxygen content is balanced, the oxygen content is high, and the deoxidation is poor; secondly, the air and the protective gas in the molten steel have high content and enter a casting blank along with the molten steel; and thirdly, condensed water vapor of the continuous casting copper crystallizer enters molten steel along the upper opening of the copper crystallizer.
(3) And controlling the gas content to be high. The control of poor deoxidation and the control of air, protective gas and water vapor. Firstly, the control of the deoxidation is mainly done: reducing the times of converter over-blowing and converter reversing and ensuring the end point carbon; adjusting the dosage of the deoxidizer or the type of deoxidized alloy; and (3) strongly deoxidizing by adopting an aluminum wire. Secondly, the control of the air and the protective gas is well done: the whole process of protective pouring reduces the air intake of the molten steel; argon is adopted for protection, butt joint of a sealing gap of a middle ladle is well performed, sealing is required to be tight, meanwhile, the argon guarantees about 0.3MPa of pressure, smoothness of the edge needs to be noticed when the sleeve is blown, a flare can be ignited, whether suction phenomenon exists near the sleeve is observed, and the flare can drill into the sleeve if the sealing effect of the sleeve is poor. Finally, the control for preventing the water vapor should be done: drying the alloy material, the covering agent and the covering slag, wherein the water content is less than 0.5%; increasing the discharge of water vapor of a water cooling system of the continuous casting machine by air draft; and drying the refractory materials of the steel ladle, the tundish and the pouring system to ensure that the baking is not less than 4 hours at 950-1050 ℃.
Example two;
(1) classifying edge cracks: according to the analysis and research of the edge crack defect characteristics and the formation reasons, the edge crack is found to be abnormal when the heating temperature is abnormal;
(2) reasons for heterogeneous edge cracks: the heating temperature in the heating furnace is abnormal. Firstly, the heating temperature is too high, the billet is in an overheated or over-sintered state, the oxidation and decarburization are carried out on the edge, and the intercrystalline strength of the steel is reduced; secondly, the residence time in the high temperature zone is too long. When the line rolling equipment is maintained and the casting blank in the heating furnace is heated at a high temperature, oxidation and decarburization and crystal grains grow due to overheating of the edge part, and the bonding force between the crystal grains is reduced;
(3) and (4) controlling abnormal heating temperature in the heating furnace, including control of overhigh heating temperature and control of overlong residence time in a high-temperature area. Firstly, the control of the overhigh heating temperature is mainly done: adjusting the process temperature along with the components; the temperature control system is abnormal, and the local temperature is overhigh; the correcting thermometric instrument prevents data measurement abnormality caused by failure. Secondly, the control of the overlong residence time of the high-temperature zone is well done: the length of the temperature equalizing section is properly shortened, the temperature equalizing section is in a high-temperature austenite region, the austenite is homogenized, the temperature equalizing section cannot stay in the high-temperature region for too long time, and the low-carbon steel is generally about 30 min; when the line rolling equipment is adjusted, the temperature of the casting blank in the heating furnace is gradually reduced, and the oxidation and decarburization of the edge part of the casting blank caused by overlong residence time at high temperature are prevented.
Example three;
(1) classifying edge cracks: according to the analysis and research of the edge crack defect characteristics and the formation reasons, when the edge crack is uneven deformation, the edge crack is found;
(2) reasons for heterogeneous edge cracks: edge cracking caused by uneven deformation mainly has three aspects, namely, the size of a casting blank is not matched with the width of a finished product, the size of the casting blank is smaller, and the strong spreading amount is larger during rolling; secondly, the heating temperature is not uniform, the temperatures of the upper surface and the lower surface are different, the surface with high temperature is easy to roll and deform, and the surface with low temperature is not easy to deform; thirdly, the narrow edge inside the casting blank has quality defects of cracks, inclusion or slag inclusion, and the casting blank cracks from the defect during rolling;
(3) controlling the uneven deformation; including strong spreading, uneven heating temperature and control of internal defects of casting blanks. Firstly, the main reason for controlling the strong expansion is that the width of a casting blank is not matched with the required size width of a tropical finished product, so that the width increased in the width direction during rolling is larger, the deformation of the edge of a narrow surface is larger, the internal defect is expanded to a close extent, so that the edge is cracked, and from the long-distance production, the size of a crystallizer is changed according to the requirement of the width of a finished product, the width of the casting blank is increased, casting blanks with multiple specifications are produced, and a large-size casting blank is used for rolling a steel belt with larger width; under the condition that the size of a casting blank is not changed and edge cracks appear, the width of a rolled product is adjusted by production scheduling, the width of the finished product rolled by the same batch of casting blanks (with the same internal quality defect), and the edge defect caused by large width expansion is reduced. Secondly, the heating temperature is not uniform, firstly, the temperature difference between the upper surface and the lower surface of the steel billet, especially the slab billet with larger size in the thickness direction is larger due to the non-uniform temperature field in the furnace, and the temperature field is controlled to be less than 30 ℃; secondly, the length direction and the thickness direction of the casting blank are heated unevenly, so that the deformation along the width direction is different during rolling. The third point is that the edge crack caused by internal defects such as internal cracks, slag inclusion, sulfide and gas content in the casting blank, chemical components are controlled, carbon avoids a crystal covering area, desulfurization is carried out, sulfur is controlled to be below 0.020%, the oxygen content of plain carbon steel is controlled to be below 80ppm, and the taper and the precision of the casting machine are measured and controlled according to the process specification.
Example four;
(1) classifying edge cracks: according to the analysis and research of the edge crack defect characteristics and the formation reasons, when the edge crack is found to be a casting blank surface defect;
(2) reasons for heterogeneous edge cracks: edge cracks are caused by surface defects of the casting blank, and first, the edge cracks are formed at corner parts; secondly, mechanically scratching corner parts of the casting blank; thirdly, the vibration mark is deeper;
(3) controlling surface defects of the casting blank; the method comprises the control of corner crack, mechanical scratch of the corner and the control of vibration mark depth. Firstly, controlling corner cracks from three aspects, wherein firstly, when the content of aluminum and nitrogen is high, corner cracks are easily formed on a casting blank, Als is controlled to be less than or equal to 0.020%, and nitrogen is controlled to be less than or equal to 50 ppm; secondly, casting blank cracks are easily formed when the straightening temperature is low, the temperature of a straightening area is more than or equal to 900 ℃, thirdly, the casting blank cracks are also easily formed when the radian and the opening degree of a casting machine are large, the radian is controlled to be less than or equal to +/-0.3 mm, and the opening degree is controlled to be less than or equal to +/-0.2 mm. Secondly, the control of the mechanical scratching of the corners firstly controls the fan-shaped sections to supply grease in time to prevent the rollers from not rotating, the bearings from sinking, wearing, slag accumulation and the like, secondly controls the timely cleaning of the oxidizing slag and the cold steel, and mainly controls the scratching of the lower surface of the casting blank in a large area because the accumulated oxidizing slag between the lower surface of the casting blank and the lower roller is difficult to fall off and is clamped between the casting blank and the rollers. And thirdly, preventing the steel belt from being scratched at the opposite side parts of the side guide plates after deviation by using a regulating device with hydraulic pressure, paying attention to the influence of different rolling forces on the deviation on the two sides, and mainly observing roller heating, bearing expansion, roller centering, tension fluctuation, rolling speed, material strength and thickness, roller gap friction and the like. In addition, the vibration mark is deep due to long negative slip time, large amplitude, small vibration frequency, high melting temperature and viscosity of the casting powder and the like, casting powder substances are accumulated at the vibration mark, and oxidation and decarburization are easy to occur at the vibration mark after the casting powder enters a heating furnace, so that the bonding force of a crystal boundary is reduced, and the edge crack is further formed by extension.
Example five;
(1) classifying edge cracks: according to the analysis and research of the edge crack defect characteristics and the formation reasons, the edge crack is found to be the equipment scratch;
(2) reasons for heterogeneous edge cracks: equipment scratch, mainly scratches of casting machine equipment and rolling equipment;
(3) controlling equipment scratch; firstly, the casting machine equipment is mainly controlled from two aspects, firstly, grease is not supplied to a sector section in time, the grease supply of a grease supply distributor is prevented from stopping, partial grease supply pipelines are prevented from shifting, the radiation heat of the casting blank causes grease sintering and carbonization, a bearing is prevented from rotating, and the casting blank is scratched, so that the sector section needs to be lubricated by grease in time; secondly, because the roller rotates and increases the resistance because of the oxidation slag is piled up, some get into the bearing frame, lead to the roller can't rotate, in time clear up oxidation slag and cold steel, prevent that casting blank lower surface and roller upper surface from blocking the fish tail. Secondly, the damage of the rolling line equipment, the expansion of a bearing caused by heating of a roller or poor lubrication due to poor cooling, and the scratch of the side guide plate caused by the deviation of the center of a steel strip caused by tension fluctuation or high rolling speed. Therefore, the adopted control method comprises the following steps: firstly, a side guide plate with a hydraulic adjusting device is adopted, and Q345B or a material with stronger strength is recommended to be selected for the guide plate, so that the mechanical strength and the clamping force of the guide plate are ensured, the centering property and the stable operation are ensured, and the edge damage caused by deviation is prevented; secondly, the change of rolling force on two sides of the steel strip is reduced, so that the roller is uniformly cooled, and the micro deformation caused by the heating of the roller is reduced; the bearing is regularly checked, cleaned and greased, so that the expansion of the bearing is reduced; adjusting the torque of a loop motor to reduce tension fluctuation; the rolling speed is controlled, and the deviation is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A production control method for edge crack defects of hot rolled steel strips is characterized by comprising the following steps:
(1) classifying edge cracks: according to the analysis and research of the edge crack defect characteristics and the formation reasons, the edge cracks can be divided into the following five types: high gas content, abnormal heating temperature, uneven deformation, casting blank surface defect and equipment scratch,
(2) reasons for heterogeneous edge cracks:
a, the gas content is high and comprises poor deoxidation, high air and protective gas content and condensed water steam mixing;
b, the abnormal heating temperature comprises overhigh heating temperature and overlong residence time of a high-temperature area;
c, the uneven deformation comprises mismatching of the size of a casting blank and the width of a finished product, uneven heating temperature and internal quality defects of the casting blank;
d, the defects on the surface of the casting blank comprise corner cracks, mechanical scratches and deep vibration marks of the corner parts of the casting blank;
e, scratching the equipment comprises scratching the casting machine equipment and the rolling equipment;
(3) controlling various edge cracks:
control of the gas content is high: a, reducing the times of converter over-blowing and converter reversing and ensuring the end point carbon; b, adjusting the dosage of the deoxidizer or adjusting the type of deoxidized alloy; c, strongly deoxidizing by adopting an aluminum wire; d, controlling air and protective gas; e, controlling water vapor;
control of the heating temperature abnormality: a, controlling the heating temperature; b, controlling the residence time of the high-temperature zone;
control of the non-uniform deformation: a, increasing the width of a casting blank, producing the casting blanks with multiple specifications, and rolling a steel belt with larger width by using the large-specification casting blank; b, controlling the temperature field to be less than 30 ℃; c, controlling chemical components, and desulfurizing if carbon is required to avoid a crystal covering region;
controlling the surface defects of the casting blank: a, controlling the content of aluminum and nitrogen; b, controlling the temperature of the straightening area; c, controlling the radian and the opening of the casting machine; d, timely feeding grease to the sector section; e, cleaning the oxidation slag and the cold steel in time; f, adjusting the position of the steel belt to prevent the steel belt from deviating;
controlling the equipment scratch: a preventing the grease dispenser from stopping feeding grease; b, cleaning oxidation slag and cold steel in time; c, using a side guide plate with a hydraulic adjusting device; d, uniformly cooling the roller; e, the bearing is periodically checked, cleaned and greased, so that the expansion of the bearing is reduced; f, adjusting the torque of the loop motor and controlling the rolling speed.
2. The production control method for the edge crack defect of the hot rolled steel strip as claimed in claim 1, characterized in that: air and protective gas are controlled in the control of high gas content, argon is adopted for protection, the butt joint of the sealing gap of the tundish is tight in sealing, and meanwhile, the argon guarantees about 0.3MPa of pressure.
3. The production control method of an edge crack defect of a hot rolled steel strip as claimed in claim 2, characterized in that: and controlling water vapor in the control of high gas content, drying the alloy material, the covering agent and the covering slag, wherein the water content is less than 0.5%, drying the refractory materials of the steel ladle, the tundish and the pouring system, and ensuring that the baking is not less than 4 hours at 950-1050 ℃.
4. The production control method for the edge crack defect of the hot rolled steel strip as claimed in claim 3, characterized in that: and in the control of the heating temperature abnormity, the residence time of the high-temperature area is controlled, and the low-carbon steel is controlled within about 30 min.
5. The method for controlling the production of the edge crack defect of the hot rolled steel strip as claimed in claim 4, wherein: in the control of the uneven deformation, chemical components are controlled, a carbon crystal covering region is avoided, the sulfur is controlled to be below 0.020%, and the oxygen content of plain carbon steel is controlled to be below 80 ppm.
6. The production control method for the edge crack defect of the hot rolled steel strip as claimed in claim 5, characterized in that: the content of aluminum and nitrogen is controlled in the control of the surface defects of the casting blank, the content of aluminum is controlled to be less than or equal to 0.020%, and the content of nitrogen is controlled to be less than or equal to 50 ppm.
7. The production control method for the edge crack defect of the hot rolled steel strip as claimed in claim 6, characterized in that: the temperature of a straightening area is controlled in the control of the surface defects of the casting blank, and the temperature of the straightening area is more than or equal to 900 ℃.
8. The production control method for the edge crack defect of the hot rolled steel strip as claimed in claim 7, characterized in that: and controlling the radian and the opening of the casting machine in the control of the surface defects of the casting blank, wherein the radian is controlled to be less than or equal to +/-0.3 mm, and the opening degree is controlled to be less than or equal to +/-0.2 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113828746A (en) * | 2021-09-22 | 2021-12-24 | 日照钢铁控股集团有限公司 | Method for evaluating crystallizer flow field by utilizing vibration trace distribution of casting blank |
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