CN114535315B - Process for preventing hot rolling edge crack of high-magnetic-induction oriented silicon steel - Google Patents
Process for preventing hot rolling edge crack of high-magnetic-induction oriented silicon steel Download PDFInfo
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- CN114535315B CN114535315B CN202210117297.4A CN202210117297A CN114535315B CN 114535315 B CN114535315 B CN 114535315B CN 202210117297 A CN202210117297 A CN 202210117297A CN 114535315 B CN114535315 B CN 114535315B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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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
- C21D11/00—Process control or regulation for heat treatments
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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Abstract
The invention relates to the field of high-magnetic induction oriented silicon steel processing. The hot rolling edge cracking preventing process for high magnetic induction oriented silicon steel includes the steps of controlling the casting blank stripping amount of high magnetic induction oriented silicon steel to be 0-6 mm, controlling the surface temperature of the high magnetic induction oriented silicon steel blank before the high magnetic induction oriented silicon steel blank enters a heating furnace to be 550-650 ℃, heating the heating furnace by adopting two heating sections and one soaking section, controlling the furnace gas temperature of the first heating section of the heating furnace to be 1000-1100 ℃, controlling the furnace gas temperatures of the second heating section of the heating furnace and the soaking section to be 1050-1250 ℃, and performing rough rolling and finish rolling on the high magnetic induction oriented silicon steel blank after the high magnetic induction oriented silicon steel blank is heated by the heating furnace. The quality of the hot rolled strip steel edge of the high magnetic induction oriented silicon steel is obviously improved, and the split of the hot rolled edge is reduced from 28% to below 5%.
Description
Technical Field
The invention relates to the field of high-magnetic induction oriented silicon steel processing.
Background
The oriented silicon steel is called as an artwork in steel products, and the high magnetic induction oriented silicon steel is manufactured by the procedures of smelting, hot rolling, normalizing, cold rolling, decarburization nitriding annealing, high-temperature annealing and the like, and has the advantages of complex process, long flow, strict component control, extremely low inclusion content requirement and multiple factors affecting the quality and yield of the products.
The silicon content of the high magnetic induction oriented silicon steel is 3.0% -3.5%, the high magnetic induction oriented silicon steel has the characteristics of low heat conductivity, poor toughness and the like, and if the slab heating process is improper, microcracks are easy to appear at the edge. In the hot rolling process of the plate blank with the microcracks, the microcracks are continuously expanded and extend to the surface under the action of rolling force, and finally edge cracking defects finally appear, particularly in the hot continuous rolling finish rolling process, under the action of tension, the expansion of the microcracks is quicker due to low temperature of the edge, and the edge cracking phenomenon is more prominent. Edge cracks generated by high-magnetic induction oriented silicon steel are easy to cause belt breakage in the subsequent cold rolling and annealing processes. In order to reduce the harm of edge cracking to cold rolling and annealing, the trimming amount must be increased, the edge cracking defects are completely removed, the yield of products is reduced, the production cost is increased, and the width of the products is unqualified.
CN 113042532A discloses a quality control method for the edge of hot rolled steel strip of Bi-containing high magnetic induction oriented silicon steel, by controlling the hot rolling process, the size of the edge crack of the hot rolled steel strip can be reduced to not more than 5mm, the ratio of the edge crack less than or equal to 2mm can reach more than 95%, the trimming amount of the later process is small, even no trimming is needed, cold rolling can be performed, and the yield of the product can be improved by 2-4% compared with the prior art; and the energy consumption is reduced due to the reduction of the heating temperature of the casting blank.
CN 112605122A relates to a processing method for improving the edge quality of a silicon steel hot rolled plate, which comprises the following steps: continuous casting, casting blank pre-deformation treatment, casting blank heating treatment and hot rolling treatment; wherein, the casting blank pre-deformation treatment comprises: applying pressure to two side walls of the casting blank along the length direction through a vertical roller at the temperature of 500-900 ℃ until the deformation amount is 10-50 mm; the heating temperature of the casting blank heating treatment is 1100-1200 ℃, and the heat preservation time is 4-6 h. The processing method for improving the quality of the edge of the silicon steel hot rolled plate adopts the side pressure process of the two side walls of the casting blank, effectively solves the defect of the crack of the edge of the hot rolled plate, improves the plasticity of the edge, improves the yield and reduces the production cost.
CN 113058998A relates to a method for preventing hot rolling edge cracking of low-temperature heating oriented silicon steel, which comprises the steps of controlling the surface temperature of an oriented silicon steel casting blank before entering a heating furnace to be not lower than 560 ℃ and controlling the furnace gas temperature of a preheating section of the heating furnace to be lower than 950 ℃; the second heating section is heated quickly, and the heating speed is 15-30 ℃/min; the tapping temperature is controlled within the range of 1140-1170 ℃, the rough rolling pass is not more than 5 passes, the rough rolling side pressure is more than or equal to 75mm, and the side pressure of the vertical rolling mill is more than 40 mm; the final rolling temperature of the steel strip is controlled within the range of 901-959 ℃, and the edge of the steel strip is heated and compensated before finish rolling, so that the problem of hot rolling edge crack of the low-temperature heated oriented silicon steel can be avoided or eliminated. According to the method, a plurality of tests are carried out, and the result shows that the edge crack of the oriented silicon steel occurs at time and has the defect.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the casting blank stripping amount is controlled, the casting blank feeding temperature is improved, the heating temperature of the second heating section and the soaking section is selected, the rough rolling side pressure and the side heating power are reasonably adjusted, the finish rolling blowback measures are properly reduced, and the hot rolling side cracking of the high-magnetic-induction oriented silicon steel is effectively prevented.
The technical scheme adopted by the invention is as follows: the hot rolling edge cracking preventing process for high magnetic induction oriented silicon steel includes the steps of controlling the casting blank stripping amount of high magnetic induction oriented silicon steel to be 0-6 mm, controlling the surface temperature of the high magnetic induction oriented silicon steel blank before the high magnetic induction oriented silicon steel blank enters a heating furnace to be 550-650 ℃, heating the heating furnace by adopting two heating sections and one soaking section, controlling the furnace gas temperature of the first heating section of the heating furnace to be 1000-1100 ℃, controlling the furnace gas temperatures of the second heating section of the heating furnace and the soaking section to be 1050-1250 ℃, and performing rough rolling and finish rolling on the high magnetic induction oriented silicon steel blank after the high magnetic induction oriented silicon steel blank is heated by the heating furnace.
The high magnetic induction oriented silicon steel plate blank uniformly advances in a stepping mode in a second heating section and a soaking section of the heating furnace, and the sum of the time of the high magnetic induction oriented silicon steel plate blank in the second heating section and the soaking section of the heating furnace is 90-180 minutes.
The high magnetic induction oriented silicon steel plate blank uniformly advances in a stepping mode in a second heating section and a soaking section of the heating furnace, and the sum of the time of the high magnetic induction oriented silicon steel plate blank in the second heating section and the soaking section of the heating furnace is 120-170 minutes.
When four-furnace hot rolling production is adopted, the tapping interval time of the high magnetic induction oriented silicon steel slab is 150-250 seconds, namely the rhythm is 150-250 seconds.
When four-furnace hot rolling production is adopted, the discharging interval time of the high magnetic induction oriented silicon steel slab is 180-250 seconds, namely the rhythm is 180-240 seconds.
During rough rolling, the initial thickness of the high-magnetic induction oriented silicon steel slab is 220mm, the high-magnetic induction oriented silicon steel slab is rolled for 5-7 times by using a reversible roughing mill, the lateral pressure of the rough rolling is controlled to be 10-30 mm, and the thickness of the high-magnetic induction oriented silicon steel slab is rolled to be 38-50 mm.
During finish rolling, a seven-frame finishing mill group is used for rolling 7 times, during finish rolling, in order to reduce the temperature difference between the upper surface and the lower surface and reduce the back blowing water quantity, a rough rolled plate blank is rolled into a hot rolled steel coil with the thickness of 2.0-2.6 mm, wherein the finish rolling finishing temperature is 950-980 ℃, and the coiling temperature is 500-600 ℃.
The furnace gas temperature of the second heating section and the soaking section of the heating furnace is controlled to be 1070-1230 ℃.
The beneficial effects of the invention are as follows: the casting blank stripping amount is controlled, the casting blank feeding temperature is improved, the rough rolling side pressure and the side heating power are reasonably adjusted by selecting proper heating temperatures of the second heating section and the soaking section, the finish rolling blowback measures are properly reduced, the side quality of the high-magnetic induction oriented silicon steel hot rolled strip steel is remarkably improved, and the hot rolled side gap is reduced to below 5% from 28%.
Drawings
FIG. 1 is a schematic view of a hot rolled edge portion of a silicon steel after being processed in accordance with example 2 of the present invention;
FIG. 2 is a schematic view of a hot rolled edge portion of a prior art processed silicon steel.
Detailed Description
Example 1:
in the embodiment, the production is carried out on a 1549mm hot continuous rolling line, the heating furnace is a four-step heating furnace, steel is alternately tapped, and the production process comprises the following steps:
the casting blank stripping amount is controlled to be 5mm, the slab is heated and fed into a heating furnace, the surface temperature of the slab entering the furnace is controlled to be 565 ℃, and the furnace gas temperature of a first heating section of the heating furnace is controlled to be 1100 ℃ (namely, the slab is heated from 565 ℃ to 1100 ℃); determining the furnace gas temperature of a second heating section and a soaking section of the heating furnace to be 1200 ℃ (the second heating section of the heating furnace is heated from 1100 ℃ to 1200 ℃, then preserving heat), advancing at a uniform speed in a stepping mode, wherein the sum of the heating time of the two sections corresponding to the second heating section and the soaking section is 175 minutes, and controlling the alternate tapping rhythm of the oriented silicon steel slab to be 150 seconds when four-furnace hot rolling production is adopted; and (3) rolling for 7 times by using a reversible roughing mill, wherein the side pressure of the roughing mill is controlled to be 20mm, the thickness of a plate blank is controlled to be 40mm, a side heater is required before finish rolling, the power is adjusted to be 90%, 7 times by using a seven-frame finishing mill group, F6 back blowing water is started, and the plate blank after rough rolling is rolled into a hot rolled steel coil with the thickness of 2.35mm, wherein the finish rolling finishing temperature is 965 ℃, and the coiling temperature is 550 ℃.
Example 2:
in the embodiment, the production is carried out on a 1549mm hot continuous rolling line, the heating furnace is a four-step heating furnace, steel is alternately tapped, and the production process comprises the following steps:
the casting blank stripping amount is controlled at 3 mm, the slab is heated and sent into a heating furnace, the surface temperature of the slab entering the furnace is controlled at 580 ℃, and the furnace gas temperature of a first heating section of the heating furnace is controlled at 1060 ℃; determining the furnace gas temperature of a second heating section and a soaking section of the heating furnace to be 1190 ℃, advancing in a stepping mode at a uniform speed, wherein the sum of the heating time of the two sections corresponding to the second heating section and the soaking section is 165 minutes, and controlling the alternate tapping rhythm of the oriented silicon steel slab to be 180 seconds during four-furnace hot rolling production; the plate blank after rough rolling is rolled into a hot rolled steel coil with the thickness of 2.40mm by using a reversible roughing mill for 7 times, the side pressure of the rough rolling is controlled to be 20mm, the thickness of the plate blank is 45mm, a side heater is needed before finish rolling, the power is adjusted to be 80 percent, a seven-frame finishing mill group is used for 7 times, F5 and F6 back blowing water is started, and the plate blank after rough rolling is rolled into the hot rolled steel coil with the thickness of 2.40mm, wherein the finish rolling finishing temperature is 960 ℃, and the coiling temperature is 570 ℃.
Example 3:
in the embodiment, the production is carried out on a 1549mm hot continuous rolling line, the heating furnace is a four-step heating furnace, steel is alternately tapped, and the production process comprises the following steps:
the casting blank stripping amount is controlled to be 6mm, a plate blank is heated and sent into a heating furnace, the surface temperature of the plate blank entering the furnace is controlled to be 560 ℃, and the furnace gas temperature of a first heating section of the heating furnace is controlled to be 1080 ℃; determining the furnace gas temperature of a second heating section and a soaking section of the heating furnace to be 1220 ℃, advancing in a stepping mode at a constant speed, wherein the sum of the heating time of the two sections corresponding to the second heating section and the soaking section is 160 minutes, and controlling the alternate tapping rhythm of the oriented silicon steel slab to be 210 seconds during four-furnace hot rolling production; the rough rolling side pressure is controlled to be 15mm, the thickness of a plate blank is 47mm, a side heater is needed before finish rolling, the power is adjusted to be 80%, a seven-frame finishing mill group is used for rolling 7 passes, F6 back blowing water is started, the plate blank after rough rolling is rolled into a hot rolled steel coil with the thickness of 2.30mm, the finish rolling finishing temperature is 955 ℃, and the coiling temperature is 540 ℃.
Example 4:
in the embodiment, the production is carried out on a 1549mm hot continuous rolling line, the heating furnace is a four-step heating furnace, steel is alternately tapped, and the production process comprises the following steps:
the casting blank stripping amount is controlled to be 5mm, a plate blank is heated and sent into a heating furnace, the surface temperature of the plate blank entering the furnace is controlled to be 590 ℃, and the furnace gas temperature of a first heating section of the heating furnace is controlled to be 1070 ℃; determining the furnace gas temperature of a second heating section and a soaking section of the heating furnace to be 1180 ℃, advancing in a stepping mode at a constant speed, wherein the sum of the heating time of the two sections corresponding to the second heating section and the soaking section is 170 minutes, and controlling the alternate tapping rhythm of the oriented silicon steel slab to be 200 seconds during four-furnace hot rolling production; and (3) rolling for 7 times by using a reversible roughing mill, wherein the side pressure of rough rolling is controlled to be 25mm, the thickness of a plate blank is controlled to be 40mm, a side heater is required before finish rolling, the power is adjusted to be 70%, 7 times of rolling are performed by using a seven-frame finishing mill group, F5 and F6 back blowing water is started, and the plate blank after rough rolling is rolled into a hot rolled steel coil with the thickness of 2.35mm, wherein the finish rolling finishing temperature is 970 ℃, and the coiling temperature is 555 ℃.
The above embodiments are only for illustrating the technical solution of the present invention, not for limiting, and any person skilled in the art should be able to substitute or change the technical solution according to the present invention and the inventive concept within the scope of the present invention.
Claims (5)
1. A hot rolling edge crack prevention process for high magnetic induction oriented silicon steel is characterized by comprising the following steps of: controlling the stripping amount of the high-magnetic induction oriented silicon steel casting blank to be 0-6 mm, controlling the surface temperature of the high-magnetic induction oriented silicon steel casting blank before entering a heating furnace to be 550-650 ℃, heating the heating furnace by adopting two heating sections and one soaking section, controlling the furnace gas temperature of the first heating section of the heating furnace to be 1000-1100 ℃, controlling the furnace gas temperatures of the second heating section and the soaking section of the heating furnace to be 1050-1250 ℃, and performing rolling in two sections of rough rolling and finish rolling after the high-magnetic induction oriented silicon steel casting blank is heated by the heating furnace; the high-magnetic induction oriented silicon steel casting blank uniformly advances in a stepping mode in a second heating section and a soaking section of the heating furnace, and the sum of the time of the high-magnetic induction oriented silicon steel casting blank in the second heating section and the soaking section of the heating furnace is 90-180 minutes; during rough rolling, the initial thickness of the high-magnetic induction oriented silicon steel casting blank is 220mm, a reversible roughing mill is used for rolling for 7 times, the lateral pressure of the rough rolling is controlled to be 10-30 mm, and the casting blank is rolled to a plate blank with the thickness of 38-50 mm; during finish rolling, a seven-frame finishing mill group is used for rolling 7 times, during finish rolling, in order to reduce the temperature difference between the upper surface and the lower surface and reduce the back blowing water quantity, a rough rolled plate blank is rolled into a hot rolled steel coil with the thickness of 2.0-2.6 mm, wherein the finish rolling finishing temperature is 950-980 ℃, and the coiling temperature is 500-600 ℃.
2. The process for preventing hot rolling edge cracking of high-magnetic-induction oriented silicon steel according to claim 1, wherein the process comprises the following steps: the sum of the time of the second heating section and the soaking section of the heating furnace for the high magnetic induction oriented silicon steel casting blank is 120-170 minutes.
3. The process for preventing hot rolling edge cracking of high-magnetic-induction oriented silicon steel according to claim 1, wherein the process comprises the following steps: when the four-furnace hot rolling production is adopted, the tapping interval time of the high-magnetic induction oriented silicon steel casting blank is 150-250 seconds, namely the rhythm is 150-250 seconds.
4. A process for preventing hot rolling edge cracking of high magnetic induction oriented silicon steel according to claim 3, characterized in that: when the four-furnace hot rolling production is adopted, the time interval between the casting blank and the furnace discharge of the high-magnetic induction oriented silicon steel casting blank is 180-250 seconds, namely the rhythm is 180-250 seconds.
5. The process for preventing hot rolling edge cracking of high-magnetic-induction oriented silicon steel according to claim 1, wherein the process comprises the following steps: the furnace gas temperature of the second heating section and the soaking section of the heating furnace is controlled to be 1070-1230 ℃.
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