KR20160121709A - Manufacturing method for high strength steel palte with high arc sensing and steel plate with high arc sensing thereof - Google Patents
Manufacturing method for high strength steel palte with high arc sensing and steel plate with high arc sensing thereof Download PDFInfo
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- KR20160121709A KR20160121709A KR1020150050807A KR20150050807A KR20160121709A KR 20160121709 A KR20160121709 A KR 20160121709A KR 1020150050807 A KR1020150050807 A KR 1020150050807A KR 20150050807 A KR20150050807 A KR 20150050807A KR 20160121709 A KR20160121709 A KR 20160121709A
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- steel sheet
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- calibrating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/42—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for step-by-step or planetary rolling
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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
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
Description
The present invention relates to a method for manufacturing a steel sheet having excellent arc sensing characteristics, and more particularly, to a steel sheet manufacturing method having excellent arc sensing characteristics with improved conductivity in a steel sheet produced by a general rolling process.
Generally, frames of construction machines such as forklays are welded by arc robot welding in which the steel plate is welded by a welding robot.
The arc robot welding is to weld the welding rod installed on the welding robot through the arc sensing while accurately tracking the boundary line between the welding center line, that is, the two members adhered to each other for welding.
The arc robot welding generates an arc current between the welding electrode and the members to be welded during weaving of the welding electrode and changes the arc current The welding center line is traced and welded based on the change of the value.
Steel plates used for manufacturing frames of construction machines such as forklifts are classified into steel plates after excellent rolling productivity and steel plates after controlled rolling with relatively good quality and mechanical properties.
In the case of the steel sheet having a high rolling temperature during the production of the steel sheet, there is a large gap between the oxide scale and the steel structure of the steel sheet when the adhesion between the oxide scale and the steel sheet is low, There is a problem that the welding is not performed at the desired position due to insufficiency of electricity in the arc sensing of the X, Y and Z position correcting function of the robot welder when the arc robot is welded.
Particularly, in the case of a steel sheet manufactured through an As Rolled process, the productivity is low and the manufacturing cost is low, but the degree of adhesion between the oxide scale and the steel sheet metal is frequently low, There has been a problem in that defects are caused in the welding of robots.
In the present invention and related prior art, a technique has been proposed in which the feed rate of the steel sheet is controlled to increase the hot calibration efficiency in the Korean Patent Registration No. 1197999 'Method and Apparatus for Producing Steel Sheet' (registered on October 30, 2012) By increasing the flatness of the steel sheet, there is a limitation in improving the accuracy of electric conductivity and arc sensing, so that the problem of electric conductivity that causes defects in welding arc robots can not be solved.
It is an object of the present invention to eliminate the continuity of gaps by eliminating the continuous gaps between the oxide scale and the post-steel matrix, or preferably only to less than 300 micrometers, and by improving the surface roughness, And to provide a post-steel sheet having excellent arc-sensing properties produced by the method.
According to another aspect of the present invention, there is provided a method of manufacturing a steel plate having excellent arc sensing characteristics, including heating a slab in a heating furnace;
A rough rolling step of rolling the heated slab a plurality of times;
An oscillation step of oscillating the rough-rolled slab;
A finish rolling step in which a steel sheet is manufactured by oscillating a plurality of times of rolling; And
And a hot calibrating step of calibrating the steel sheet after the finish rolling by a hot calibrator,
The hot calibrating step includes a hot calibrator having an inlet calibrating roll interval of 0.9 to 0.95 times the thickness of the rear calibrating plate and a final calibrating roll interval of 1.07 to 1.15 times the thickness of the backing plate, And hot-calibrating the steel sheet.
In the present invention, the slab preferably contains 0.14 to 0.16% of C, 0.30 to 0.38% of Si, 1.33 to 1.9% of Mn, more than 0 to 0.020% of P, 0.05% Al, 0.02-0.05% Al, the balance Fe and other unavoidable impurities.
In the present invention, the slab may satisfy a carbon equivalent (Ceq) of 0.36 to 0.42 and a welding crack susceptibility index (Pcm) of 0.22 to 0.25.
In the heating step of the present invention, the slab is heated to 1066 DEG C to 1125 DEG C in a heating furnace, and the rough rolling step is carried out for 6 to 8 times and the temperature is 948 DEG C to 980 DEG C , And the finishing rolling step may be performed at a temperature of 944 ° C to 976 ° C at the end of rolling after 7 to 9 times of rolling.
In the present invention, the hot steel sheet may be calibrated at a calibrating pressure of 212 to 138 tons.
In the present invention, it is possible to form the rear steel plate so that the maximum height of the surface roughness is 43 to 46 μm.
The backsheet having excellent arc sensing characteristics according to the present invention is manufactured by a backsheet manufacturing method having excellent arc sensing characteristics.
The post-steel sheet having excellent arc sensing characteristics according to the present invention can be formed only with a continuous gap between the oxide scale area and the pearlite fraction reduction area less than 300 탆.
The backsheet having excellent arc sensing characteristics according to the present invention may have a resistance of 300 k? Or less in the entire steel sheet.
The present invention eliminates the continuous gap between the oxide scale and the post-metal matrix structure, or preferably only to less than 300 [micro] m, thereby eliminating the continuity of the gap, thereby improving the overall conductivity of the post- have.
The present invention is effective in adjusting the spacing between the surface roughness and the oxidation scale of the post-steel sheet and the metrix structure of the post-steel sheet during hot-calibrating, thereby improving the conductivity of the post-steel sheet.
The present invention greatly improves the electric conductivity of a steel sheet after being manufactured by a general rolling process, greatly reducing a defect rate in welding an arc robot, and manufacturing a steel sheet suitable for arc robot welding at a low manufacturing cost.
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a process diagram showing a method for manufacturing a steel sheet having excellent arc sensing characteristics according to the present invention
2 is a schematic view showing a method of manufacturing a steel sheet having excellent arc sensing characteristics according to the present invention.
3 is an enlarged photograph of the cross-sectional structure of the steel sheet produced according to the present invention.
Fig. 4 is an enlarged photograph of the cross-sectional structure of the steel sheet to be compared according to the present invention. Fig.
FIG. 5 is a schematic view showing a position of a steel plate after manufacturing according to the present invention and a position where a resistance value of a rear steel plate to be compared is measured. FIG.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to the detailed description of the present invention, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.
1 and 2, a method of manufacturing a steel sheet having excellent arc sensing characteristics according to the present invention includes a heating step (S100) of heating a slab in a heating furnace (10), a step of heating a slab A rolling step (S200), an oscillation step (S300) for oscillating the rough-rolled slab, a scrap rolling step (S400) for producing an oscillated multi-roll steel sheet to produce a post-hot rolled steel sheet, And a calibration step S500.
Wherein the slab comprises 0.14 to 0.16% of C, 0.30 to 0.38% of Si, 1.33 to 1.9% of Mn, more than 0 to 0.020% of P, , Al: 0.02 to 0.05%, the balance Fe and other unavoidable impurities.
Further, the slabs are deoxidized by a deoxidation method of Al-Si-Killed (Vacuum Degassing) and have a carbon equivalent (Ceq) of 0.36 to 0.42 and a weld cracking susceptibility index (Pcm) of 0.22 to 0.25.
In the heating step (S100), the slab is heated to 1066 DEG C to 1125 DEG C and discharged from the heating furnace (10). In the rough rolling step S200, the roughing mill (RM) 20 is subjected to a rolling process for 6 to 8 times, and the temperature at the end of rolling is preferably 948 to 980 ° C.
In the oscillation step S300, the slabs roughly rolled by using the
In the finishing mill (FM)
In the hot calibration step S500, the gap between the inlet calibration rolls is 0.9 to 0.95 times the thickness of the steel plate, and the calibration gap between the final outlet calibration rolls is 1.07 to 1.15 times the thickness of the steel sheet. The steel plate is thermally calibrated with the calibrator (50).
In the hot calibration step (S500), the rear steel plate is calibrated at a calibration pressure of 212 to 138 ton to form a maximum height of the rear steel plate so as to have a surface roughness of 43 to 46 μm.
FIG. 3 is an enlarged photograph of a cross-sectional structure of a steel sheet as an embodiment of the present invention through an electron microscope, and FIG. 4 is an enlarged photograph of a cross-sectional structure of a steel sheet as a comparative example of the present invention through an electron microscope.
The embodiment of the present invention as shown in FIG. 3 is characterized in that it comprises 0.15% of C, 0.35% of Si, 1.6% of Mn, 0.017% of P, 0.013% of S, 0.02% of Cr, 0.04% of Al, The slab containing other unavoidable impurities was heated to 1120 占 폚 and then subjected to seven rough rolling steps at a rolling finishing temperature of 958 占 폚, seven finishing rolling steps (S400) at a rolling finish temperature of 958 占 폚 and a thickness of 25 mm, A
The comparative example of FIG. 4 is a comparative example of FIG. 4, wherein the weight ratio is 0.15% of C, 0.35% of Si, 1.6% of Mn, 0.017% of P, 0.013% or less of S, 0.02% of Cr, 0.04% The slab containing other unavoidable impurities was heated to 1120 占 폚 and then subjected to seven rough rolling steps at a rolling finishing temperature of 958 占 폚, seven finishing rolling steps (S400) at a rolling finish temperature of 958 占 폚 and a thickness of 25 mm, Is a steel plate after the inlet calibrating roll interval has an average of 21.2 mm and the final calibrating roll interval is 25.4 mm with a
The calibration pressure in the hot calibration in FIG. 3 is 138 to 212 tons, and the calibration pressure in the hot calibration in FIG. 4 is 274 to 318 tons.
Referring to FIG. 3, it can be seen that the embodiment of the present invention shows that there is almost no thin black continuous gap between the oxide scale area and the pearlite fraction reduction area, and that between the oxide scale area and the pearlite fraction reduction area Even if a continuous gap exists in a short section, there is no portion formed with a length of 300 mu m or more. That is, the embodiment of the present invention forms a continuous gap between the oxide scale region and the pearlite fraction reduction region only to less than 300 mu m. Alternatively, embodiments of the present invention do not have continuous black gaps between the oxide scale area and the pearlite fraction reduction area.
Referring to FIG. 4, in the comparative example, a black continuous gap between the oxide scale area and the pearlite fraction reduction area is continuously formed in the longitudinal direction of the post-steel strip. Specifically, in FIG. 4, two lines can be clearly seen in the order from top to bottom, the area between the first line and the second line is the oxidation scale area, and the area below the second line corresponds to the pearlite fraction reduction area. In the comparative example as shown in FIG. 4, the black continuous gap corresponding to the second line is continuously formed to be 300 mu m or more, thereby lowering the conductivity. In addition, in the pearlite structure fraction reducing region, it can be seen that the decontamination phenomenon (CO, CO2) is generated by the black continuous gap (the second conspicuous line in the order from top to bottom in FIG. 4).
The steel sheet used in the embodiment of the present invention shown in Fig. 3 and the steel sheet used in the comparative example of the present invention shown in Fig. 4 are stacked in the rolling direction by three specimens at the front end side of the steel strip, The test specimens were taken from the corresponding positions of the three specimens at the rear end of the steel sheet, and the results are shown in Table 1 below.
Fig. 5 schematically shows positions where nine specimens are collected from a post-steel sheet according to an embodiment of the present invention and a post-steel sheet, which is a comparative example of the present invention.
In Table 1, the sampling position of the No. 9 specimen is shown in FIG. 5, and the results of the electrification test of Example No. 9 and Comparative Example of the specimen No. 1 are shown in Table 1 below.
As shown in Table 1, it can be seen that the embodiment of the present invention shows that the electrification performance is evenly distributed throughout the steel sheet, and that the steel sheet has a resistance of 300 k? Or less. On the other hand, in the comparative example, there is a portion having excellent electric conductivity compared to the present invention. However, a high resistance of at least 3 M? Is generated at positions of No. 2 specimen, No. 4 specimen, No. 5 specimen and No. 8 specimen. It was confirmed that it was not done at all. In other words, in the comparative example, there are many portions that are not energized due to a high resistance of 3MΩ at minimum. In the arc sensing of the X, Y and Z position correcting function of the robot welding machine during arc sensing welding, And there is a problem that the operation error causes a process failure. On the other hand, the present invention has a uniform resistance over the entire steel plate, thereby securing the electrical conductivity, thereby preventing an operation error of the robot welder during arc-sensing welding.
The present invention relates to a slab having an alloy composition of 0.14 to 0.16% C, 0.30 to 0.38% of Si, 1.33 to 1.9% of Mn, more than 0 to 0.020% of P, 0 to 0.05%, Al: 0.02 to 0.05%, the balance Fe and other unavoidable impurities,
In the manufacturing process, a heating step of heating the slab in a heating furnace, a rough rolling step of rolling the heated slab a plurality of times, an oscillation step of oscillating the roughly rolled slab, An asphaltene rolling step of producing a steel sheet; And a hot calibrating step of calibrating the steel sheet after hot rolling to a hot calibrator,
In this hot calibrating step, the setting of the existing hot calibrating rolls and the other hot calibrating rolls are set such that the calibrating roll gap on the inlet side has a gap of 0.9-0.95 times the thickness of the calendered steel sheet, By a combination of technical arrangements that have a spacing between 1.07 and 1.15 times,
A continuous gap between the oxide scale area and the pearlite fraction reduction area is minimized and the gap between the oxide scale area and the pearlite fraction reduction area is not formed beyond the interval for securing the electric conductivity, The uniform conductivity can be secured.
In the heating step in the manufacturing process, the slab is heated to 1066 ° C to 1125 ° C and discharged in a heating furnace, and the rough rolling step is carried out for 6 to 8 times, Is 948 캜 to 980 캜, and the finishing rolling step is performed through 7 to 9 times of rolling. By setting the temperature to 944 캜 to 976 캜 at the end of rolling, it is possible to exert more excellent performance. As a result, The accuracy can be further improved.
Particularly, in the present invention, a continuous gap between the oxide scale area and the pearlite fraction reduction area is further minimized by performing a hot calibration different from the conventional one in the hot calibration step after the finishing rolling step and different from the conventional method , It is possible to improve the conductivity of the steel sheet as a whole.
In addition, the present invention can improve the conductivity of the post-steel sheet by adjusting the surface roughness of the post-steel sheet and the gap between the oxide scale and the post-steel matrix structure during hot-calibrating.
The present invention greatly improves the weldability of a steel sheet after being manufactured by a general rolling process, thereby greatly reducing a defect rate in welding an arc robot and manufacturing a steel sheet suitable for arc robot welding at a low manufacturing cost.
As described above, an optimal embodiment has been disclosed in the drawings and specification. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit of the invention, The scope should be determined by the technical idea of the appended claims.
10: Heating furnace 20: Roughness rolling mill
30: Oscillation device 40: Finishing mill
50: hot calibrator S100: heating step
S200: rough rolling step S300: oscillation step
S400: finishing rolling step S500: hot rolling step
Claims (9)
A rough rolling step of rolling the heated slab a plurality of times;
An oscillation step of oscillating the rough-rolled slab;
A finish rolling step in which a steel sheet is manufactured by oscillating a plurality of times of rolling; And
And a hot calibrating step of calibrating the steel sheet after the finish rolling by a hot calibrator,
The hot calibrating step includes a hot calibrator having an inlet calibrating roll interval of 0.9 to 0.95 times the thickness of the rear calibrating plate and a final calibrating roll interval of 1.07 to 1.15 times the thickness of the backing plate, A method for manufacturing a steel sheet having excellent arc sensing characteristics, characterized by hot-calibrating the steel sheet.
Wherein the slab comprises 0.14 to 0.16% of C, 0.30 to 0.38% of Si, 1.33 to 1.9% of Mn, more than 0 to 0.020% of P, , Al: 0.02 to 0.05%, balance Fe, and other unavoidable impurities.
Wherein the slab satisfies a carbon equivalent (Ceq) of 0.36 to 0.42 and a welding crack susceptibility index (Pcm) of 0.22 to 0.25.
In the heating step, the slab is heated to 1066 DEG C to 1125 DEG C in a heating furnace,
The rough rolling step is carried out at a temperature of 948 ° C to 980 ° C at the end of rolling after 6 to 8 times rolling,
Wherein the finishing rolling step has a rolling temperature of 944 ° C. to 976 ° C. at the end of rolling after 7 to 9 rolling steps.
Wherein the hot calibrating step calibrates the steel sheet with a calibrated pressure of 212 to 138 tons.
Wherein the hot calibrating step has a maximum surface roughness of 43 to 46 占 퐉.
Wherein a continuous gap between the oxide scale region and the pearlite fraction reduction region is formed only at less than 300 mu m.
And having a resistance of not more than 300 k? In the entire steel sheet.
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| KR1020150050807A KR101673231B1 (en) | 2015-04-10 | 2015-04-10 | Manufacturing method for high strength steel palte with high arc sensing and steel plate with high arc sensing thereof |
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| KR1020150050807A KR101673231B1 (en) | 2015-04-10 | 2015-04-10 | Manufacturing method for high strength steel palte with high arc sensing and steel plate with high arc sensing thereof |
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| KR101673231B1 KR101673231B1 (en) | 2016-11-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114367536A (en) * | 2022-01-06 | 2022-04-19 | 上海轩田工业设备有限公司 | Rolling processing equipment and method for radioactive material plate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002273502A (en) * | 2001-03-16 | 2002-09-25 | Kawasaki Steel Corp | Finish-rolling method of sheet bar |
| JP2004292936A (en) * | 2003-03-28 | 2004-10-21 | Jfe Steel Kk | Method for manufacturing wide steel sheet superior in impact penetration resistance and formability |
| JP2008264786A (en) * | 2007-04-16 | 2008-11-06 | Nippon Steel Corp | Method of manufacturing steel plate |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002273502A (en) * | 2001-03-16 | 2002-09-25 | Kawasaki Steel Corp | Finish-rolling method of sheet bar |
| JP2004292936A (en) * | 2003-03-28 | 2004-10-21 | Jfe Steel Kk | Method for manufacturing wide steel sheet superior in impact penetration resistance and formability |
| JP2008264786A (en) * | 2007-04-16 | 2008-11-06 | Nippon Steel Corp | Method of manufacturing steel plate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114367536A (en) * | 2022-01-06 | 2022-04-19 | 上海轩田工业设备有限公司 | Rolling processing equipment and method for radioactive material plate |
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| KR101673231B1 (en) | 2016-11-08 |
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