CN112553539A - Low-temperature-resistant H-shaped steel and production process thereof - Google Patents
Low-temperature-resistant H-shaped steel and production process thereof Download PDFInfo
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- CN112553539A CN112553539A CN202011449194.5A CN202011449194A CN112553539A CN 112553539 A CN112553539 A CN 112553539A CN 202011449194 A CN202011449194 A CN 202011449194A CN 112553539 A CN112553539 A CN 112553539A
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention discloses low-temperature resistant H-shaped steel and a production process thereof, wherein the low-temperature resistant hot-rolled H-shaped steel comprises the following chemical components in percentage by weight: 0.05-0.11% of C, 0.20-0.35% of Si, 1.05-1.30% of Mn, less than or equal to 0.010% of P, less than or equal to 0.015% of S, 0.020-0.035% of Nb0.005-0.025% of Ti, 0.02-0.05% of V, 0.03-0.05% of Nb and the balance of Fe and trace impurities, wherein the low-temperature-resistant H-shaped steel is subjected to molten iron pretreatment, converter smelting, LF refining, continuous casting and hot rolling, the continuous casting billet obtained after continuous casting is subjected to slow cooling, the continuous casting billet is heated and subjected to soaking, and the continuous casting billet is subjected to rough rolling and finish rolling to prepare hot-rolled H-shaped steel; and S6, after the hot-rolled H-shaped steel obtained in the S5 is corrected, the hot-rolled H-shaped steel is cut into H-shaped steel products with equal length through a cutting and grinding device.
Description
Technical Field
The invention relates to the technical field of steel preparation, in particular to low-temperature-resistant H-shaped steel and a production process thereof.
Background
The H-shaped steel for the low-temperature resistant structure is mainly applied to buildings, ships, bridges, power station equipment, water conservancy, energy, chemical engineering, hoisting and transportation machinery and other steel structural parts with higher loads in alpine regions, and the steel is less in non-metallic material inclusion and has the characteristic of impact resistance under the low-temperature condition.
The invention patent with the patent number of CN101255527A discloses a boron-added H-shaped steel with good low-temperature impact toughness and a preparation method thereof, and the steel comprises the following components in percentage by weight: 0.08-0.20% of C, 1.00-1.60% of Mn1.10-0.55% of Si, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.015-0.035% of Nb0.0005-0.0012% of B, and the balance of Fe and trace impurities, but the product cost is increased due to the addition of B, and in addition, the H-shaped steel has higher C content, and the ductile-brittle transition temperature of the steel is increased along with the increase of the C content, so that the H-shaped steel is not favorable for being used in a low-temperature environment.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide low-temperature-resistant H-shaped steel and a production process thereof, so that the low-temperature resistance of steel is improved under the condition of ensuring the cost.
The purpose of the invention can be realized by the following technical scheme:
the low-temperature resistant hot-rolled H-shaped steel comprises the following chemical components in percentage by weight: 0.05-0.11% of C, 0.20-0.35% of Si, 1.05-1.30% of Mn, less than or equal to 0.010% of P, less than or equal to 0.015% of S, 0.020-0.035% of Nb0.005-0.025% of Ti, 0.02-0.05% of V, 0.03-0.05% of Nb, and the balance of Fe and trace impurities, wherein the low-temperature resistant H-shaped steel is prepared by the following steps:
s1, molten iron pretreatment: adding a desulfurizing agent into the molten iron tank for desulfurization treatment, controlling the sulfur content of the molten iron to be below 0.020 wt%, and simultaneously completely removing slag on the surface of the molten iron after desulfurization is finished;
s2, smelting in a converter: alloying and deoxidizing the molten iron, and adjusting the content of V in the molten iron to be 0.020-0.070 wt%;
s3, LF refining: firstly, controlling the oxygen content in the molten steel to be below 45ppm, and then adjusting the Ti content in the molten steel to 0.005-0.025 wt%;
s4, continuous casting: semi-protective pouring is adopted for continuous casting, and a continuous casting billet with a good surface without crack defects is obtained;
s5, hot rolling: slowly cooling the continuous casting slab obtained after continuous casting, heating the continuous casting slab to 1200-1250 ℃, soaking, and after rough rolling and finish rolling, controlling the finish rolling temperature to 860-900 ℃; naturally cooling the rolled piece to 700-750 ℃, and then carrying out vertical cooling to obtain hot-rolled H-shaped steel;
and S6, correcting the hot-rolled H-shaped steel obtained in the S5, conveying the H-shaped steel to one side through the cutting and polishing device, clamping the H-shaped steel by the first clamping device and the second clamping device when the H-shaped steel reaches a cutting position, cutting the H-shaped steel by matching with the cutting mechanism, and finally removing burrs through the polishing mechanism to cut the H-shaped steel into H-shaped steel products with equal length.
As a further scheme of the invention: the low-temperature-resistant H-shaped steel is prepared by the following steps:
s1, molten iron pretreatment: adding a desulfurizing agent into the molten iron tank for desulfurization treatment, controlling the sulfur content of the molten iron to be below 0.020 wt%, and simultaneously completely removing slag on the surface of the molten iron after desulfurization is finished;
s2, smelting in a converter: alloying and deoxidizing the molten iron, and adjusting the content of V in the molten iron to be 0.020-0.070 wt%;
s3, LF refining: firstly, controlling the oxygen content in the molten steel to be below 45ppm, and then adjusting the Ti content in the molten steel to 0.005-0.025 wt%;
s4, continuous casting: semi-protective pouring is adopted for continuous casting, and a continuous casting billet with a good surface without crack defects is obtained;
s5, hot rolling: slowly cooling the continuous casting slab obtained after continuous casting, heating the continuous casting slab to 1200-1250 ℃, soaking, and after rough rolling and finish rolling, controlling the finish rolling temperature to 860-900 ℃; naturally cooling the rolled piece to 700-750 ℃, and then carrying out vertical cooling to obtain hot-rolled H-shaped steel;
and S6, correcting the hot-rolled H-shaped steel obtained in the S5, and processing the hot-rolled H-shaped steel into H-shaped steel products with equal length through a cutting and grinding device.
As a further scheme of the invention: the cutting and polishing device comprises a workbench, a first sliding rod, a polishing mechanism, a first clamping device, a first mounting plate, a cutting mechanism, a conveying mechanism, a second clamping device, a second mounting plate, a connecting rod, a third mounting plate, a fourth motor and a lead screw, wherein the first mounting plate and the second mounting plate are fixedly connected to two sides of the top of the workbench, the first sliding rod is fixedly connected to two sides between the first mounting plate and the second mounting plate, the lead screw is rotatably connected to the middle position between the first mounting plate and the second mounting plate, the lead screw extends to the outer side of the second mounting plate, four connecting rods are fixedly connected to one side, far away from the second clamping device, of the second mounting plate and are distributed in a rectangular shape, the third mounting plate is fixedly connected to the other side of the four connecting rods, the fourth motor is fixedly connected, the cutting machine is characterized in that a first clamping device and a second clamping device are respectively installed on two sides of the screw rod, conveying mechanisms are respectively installed at positions, located between the first clamping device and the second clamping device and on one side of the top of the workbench, of the screw rod, a cutting mechanism is fixedly connected to one side, close to the first mounting plate, of the top of the workbench, a polishing mechanism is fixedly connected to one side, close to the cutting mechanism, of the top of the workbench, each conveying mechanism comprises a second bottom plate, a second mounting frame, a third motor, a first gear, a second gear, a first rotating wheel, a mounting block, a third air cylinder, a first sliding sleeve, a movable block and a second rotating wheel, the first sliding sleeve is fixedly connected to two sides of the bottom of the second bottom plate, the sliding sleeve is sleeved on the first sliding rod, the conveying mechanisms are slidably connected with the first sliding sleeve, the, output shaft fixedly connected with gear one of three motors, the opposite side of mounting bracket two is rotated and is connected with runner one, the pivot of runner one extends to the two outsides of mounting bracket, fixed mounting has gear two in the pivot of runner one, gear one and gear two-phase meshing, the top opposite side fixedly connected with installation piece of bottom plate two, the mounting groove has been seted up to the department in the middle of the installation piece, sliding connection has the movable block in the mounting groove, one side fixedly connected with cylinder three of installation piece, the piston rod of cylinder three extends to in the mounting groove, fixed connection between piston rod of cylinder three and the movable block, it is connected with runner two to rotate in the movable block.
As a further scheme of the invention: grinding machanism includes bottom plate one, cylinder one, mounting bracket one, motor one, the wheel of polishing, the equal fixedly connected with bottom plate one in top both sides of workstation, the top of bottom plate one is connected with cylinder one, the piston rod fixedly connected with mounting bracket one of cylinder one, the rotation is connected with the wheel of polishing in the mounting bracket one, the wheel of polishing becomes "king" font, the pivot of the wheel of polishing extends to the outside of mounting bracket top, the top fixedly connected with motor one of mounting bracket one, the output shaft and the pivot fixed connection of motor one.
As a further scheme of the invention: the clamping device comprises a third bottom plate, a second sliding sleeve, a fourth air cylinder, a movable clamping block, a top plate, a second sliding rod, a fixed clamping block, a fixed plate, a threaded sleeve and a fixed block, wherein the two sides of the bottom of the third bottom plate are fixedly provided with the second sliding sleeve, the middle position of the bottom of the third bottom plate is fixedly provided with the threaded sleeve, the two sliding sleeves are sleeved on the first sliding rod, the threaded sleeve is arranged on a lead screw, the middle part of the top of the third bottom plate is fixedly connected with the fixed plate, one side of the top of the fixed plate is fixedly connected with the fixed clamping block, the other side of the top of the fixed plate is fixedly connected with the fixed block, one side of the fixed block is fixedly provided with the fourth air cylinder, a piston rod of the fourth air cylinder extends to the other side of the fixed block, the piston rod of the fourth air, the bottom of the movable clamping block is connected with the fixed plate in a sliding mode, and a top plate is arranged in the movable clamping block and the fixed clamping block.
As a further scheme of the invention: the cutting mechanism comprises an underframe, a second cylinder, a rotating frame, a second motor, a connecting block, a saw blade and an installation box, wherein the connecting block is fixedly connected to the top of the workbench, the top of the workbench is close to the fixedly connected underframe on one side of the connecting block, the underframe is rotatably connected with the second cylinder, the top of the connecting block is rotatably connected with the rotating frame, the installation box is fixedly connected to one side of the rotating frame, the saw blade is installed on one side of the installation box, and the other side of the rotating frame is fixedly connected with the top of the second cylinder.
As a further scheme of the invention: the structure of the second clamping device is the same as that of the first clamping device, transverse grooves are formed in the middle positions of the movable clamping block and the fixed clamping block in the first clamping device, and gaps are formed between the mounting block and the second mounting frame and the second bottom plate.
As a further scheme of the invention: the working method of the cutting and grinding device comprises the following steps:
1) the H-shaped steel penetrates through the cutting and polishing device and is placed into the cutting and polishing device, the cylinder III is started, the rotating wheel II pushes the H-shaped steel to the rotating wheel I, the motor III rotates, and the rotating wheel I is driven through the transmission of the gear I and the gear II, so that the H-shaped steel moves to one side of the cutting mechanism;
2) after the cutting position of the H-shaped steel is adjusted, starting a fourth air cylinder, pushing the movable clamping block to move by the fourth air cylinder, pushing the H-shaped steel to the fixed clamping block, clamping the H-shaped steel, rotating the adjusting bolt, lifting the top plate, and jacking the H-shaped steel;
3) after the H-shaped steel is clamped, a second motor is started, the saw blade rotates rapidly, a second cylinder is started, the installation box is pushed to move anticlockwise, and the H-shaped steel is cut off.
4) After the H-shaped steel is cut off, the first air cylinder is started, the grinding wheels on the two sides are drawn close to the middle position, the notches of the H-shaped steel are wrapped, the first motor is started, the grinding wheels rotate fast, the notches of the H-shaped steel are ground, and burrs are removed.
The invention has the beneficial effects that:
1. the invention adopts V, Ti microalloying, which can improve the hardenability of steel, has strengthening effect when dissolved in ferrite, and can form stable carbide, in addition, the invention strictly controls the content of C element, because the ductile-brittle transition temperature is improved along with the increase of C content, and the reduction of C content is also beneficial to improving the welding performance of steel, and simultaneously V can be largely precipitated at lower temperature, thereby playing the role of improving the strength.
2. The hot-rolled H-shaped steel is conveyed to move to one side through the cutting and grinding device and the two conveying mechanisms, when the hot-rolled H-shaped steel reaches a cutting position, the H-shaped steel is clamped tightly by the first clamping device and the second clamping device, the H-shaped steel is cut off by the aid of the cutting mechanism, and finally burrs of the H-shaped steel are removed through the grinding mechanism to be processed into H-shaped steel finished products with equal length.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a top view of the overall structure of the cutting and grinding device of the present invention;
FIG. 2 is a schematic structural diagram of a conveying mechanism of the cutting and polishing device of the present invention;
FIG. 3 is a top view of the conveying mechanism of the cutting and grinding device of the present invention;
FIG. 4 is a schematic view of a cutting mechanism of the cutting and polishing device according to the present invention;
FIG. 5 is a schematic structural view of a second clamping device of the cutting and polishing device of the present invention;
fig. 6 is a schematic structural view of a grinding mechanism of the cutting and grinding device of the invention.
In the figure: 1. a work table; 2. a first sliding rod; 3. a polishing mechanism; 301. a first bottom plate; 302. a first cylinder; 303. a first mounting frame; 304. a first motor; 305. grinding the wheel; 4. a first clamping device; 5. a first mounting plate; 6. a cutting mechanism; 601. a chassis; 602. a second air cylinder; 603. rotating the frame; 604. a second motor; 605. connecting blocks; 606. a saw blade; 607. installing a box; 7. a conveying mechanism; 701. a second bottom plate; 702. a second mounting frame; 703. a third motor; 704. a first gear; 705. a second gear; 706. a first rotating wheel; 707. mounting blocks; 708. a third air cylinder; 709. a first sliding sleeve; 710. a movable block; 711. a second rotating wheel; 8. a second clamping device; 801. a bottom plate III; 802. a second sliding sleeve; 803. a cylinder IV; 804. a movable clamping block; 805. a top plate; 806. a second sliding rod; 807. fixing the clamping block; 808. a fixing plate; 809. a threaded sleeve; 810. a fixed block; 811. adjusting the bolt; 9. a second mounting plate; 10. a connecting rod; 11. mounting a third plate; 12. a fourth motor; 13. and a lead screw.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
Referring to fig. 1-6, a low temperature resistant H-shaped steel and a production process thereof, the low temperature resistant hot rolled H-shaped steel comprises the following chemical components by weight percent: 0.05-0.11% of C, 0.20-0.35% of Si, 1.05-1.30% of Mn, less than or equal to 0.010% of P, less than or equal to 0.015% of S, 0.020-0.035% of Nb0.005-0.025% of Ti, 0.02-0.05% of V, 0.03-0.05% of Nb, and the balance of Fe and trace impurities, wherein the low-temperature resistant H-shaped steel is prepared by the following steps:
s1, molten iron pretreatment: adding a desulfurizing agent into the molten iron tank for desulfurization treatment, controlling the sulfur content of the molten iron to be below 0.020 wt%, and simultaneously completely removing slag on the surface of the molten iron after desulfurization is finished;
s2, smelting in a converter: alloying and deoxidizing the molten iron, and adjusting the content of V in the molten iron to be 0.020-0.070 wt%;
s3, LF refining: firstly, controlling the oxygen content in the molten steel to be below 45ppm, and then adjusting the Ti content in the molten steel to 0.005-0.025 wt%;
s4, continuous casting: semi-protective pouring is adopted for continuous casting, and a continuous casting billet with a good surface without crack defects is obtained;
s5, hot rolling: slowly cooling the continuous casting slab obtained after continuous casting, heating the continuous casting slab to 1200-1250 ℃, soaking, and after rough rolling and finish rolling, controlling the finish rolling temperature to 860-900 ℃; naturally cooling the rolled piece to 700-750 ℃, and then carrying out vertical cooling to obtain hot-rolled H-shaped steel;
and S6, correcting the hot-rolled H-shaped steel obtained in the S5, conveying the H-shaped steel to one side through the cutting and polishing device by the two conveying mechanisms 7, clamping the H-shaped steel by the first clamping device 4 and the second clamping device 8 when the H-shaped steel reaches a cutting position, cutting off the H-shaped steel by matching with the cutting mechanism 6, and finally removing burrs through the polishing mechanism 3 to obtain H-shaped steel products with equal length.
S4, continuous casting: semi-protective pouring is adopted for continuous casting, and a continuous casting billet with a good surface without crack defects is obtained;
s5, hot rolling: slowly cooling the continuous casting slab obtained after continuous casting, heating the continuous casting slab to 1200-1250 ℃, soaking, and after rough rolling and finish rolling, controlling the finish rolling temperature to 860-900 ℃; naturally cooling the rolled piece to 700-750 ℃, and then carrying out vertical cooling to obtain hot-rolled H-shaped steel;
and S6, correcting the hot-rolled H-shaped steel obtained in the S5, and processing the hot-rolled H-shaped steel into H-shaped steel products with equal length through a cutting and grinding device.
The cutting and polishing device comprises a workbench 1, a first slide rod 2, a polishing mechanism 3, a first clamping device 4, a first mounting plate 5, a cutting mechanism 6, a conveying mechanism 7, a second clamping device 8, a second mounting plate 9, connecting rods 10, a third mounting plate 11, a fourth motor 12 and a lead screw 13, wherein the first mounting plate 5 and the second mounting plate 9 are fixedly connected to two sides of the top of the workbench 1, the first slide rod 2 is fixedly connected to two sides between the first mounting plate 5 and the second mounting plate 9, the lead screw 13 is rotatably connected to an intermediate position between the first mounting plate 5 and the second mounting plate 9, the lead screw 13 extends to the outer side of the second mounting plate 9, the second mounting plate 9 is far away from the two clamping device 8, one side of the four connecting rods 10 is fixedly connected with four connecting rods 10, the four connecting rods 10 are distributed in a rectangular shape, the other side of the four connecting rods 10, the output shaft of the motor IV 12 is fixedly connected with the screw 13, a first clamping device 4 and a second clamping device 8 are respectively installed on two sides of the screw 13, a conveying mechanism 7 is installed on the screw 13 at positions between the first clamping device 4 and the second clamping device 8 and on one side of the top of the workbench 1, a cutting mechanism 6 is fixedly connected to one side of the top of the workbench 1 close to a first mounting plate 5, a polishing mechanism 3 is fixedly connected to one side of the top of the workbench 1 close to the cutting mechanism 6, the conveying mechanism 7 comprises a second bottom plate 701, a second mounting frame 702, a third motor 703, a first gear 704, a second gear 705, a first rotating wheel 706, a mounting block 707, a third cylinder 708, a first sliding sleeve 709, a movable block 710 and a second rotating wheel 711, two sides of the bottom of the second bottom plate 701 are fixedly connected with a first sliding sleeve 709, the first sliding sleeve 709 is sleeved on a first sliding rod 2, and the conveying mechanism 7 is connected with, a second mounting rack 702 is fixedly connected to one side of the top of the second bottom plate 701, a third motor 703 is fixedly mounted on one side of the second mounting rack 702, an output shaft of the motor III 703 is fixedly connected with a gear I704, the other side of the mounting rack II 702 is rotatably connected with a rotating wheel I706, the rotating shaft of the first rotating wheel 706 extends to the outer side of the second mounting frame 702, a second gear 705 is fixedly arranged on the rotating shaft of the first rotating wheel 706, the first gear 704 is meshed with the second gear 705, the other side of the top of the second bottom plate 701 is fixedly connected with a mounting block 707, an installation groove is arranged in the middle of the installation block 707, a movable block 710 is connected in the installation groove in a sliding way, a third air cylinder 708 is fixedly connected to one side of the mounting block 707, a piston rod of the third air cylinder 708 extends into the mounting groove, the piston rod of the cylinder III 708 is fixedly connected with the movable block 710, and the movable block 710 is rotatably connected with a rotating wheel II 711.
Grinding machanism 3 includes one 301 of bottom plate, a 302 of cylinder, a 303 of mounting bracket, a 304 of motor, the wheel 305 of polishing, the equal fixedly connected with bottom plate 301 in top both sides of workstation 1, the top of a 301 of bottom plate is connected with a 302 of cylinder, a 303 of piston rod fixedly connected with mounting bracket of a 302 of cylinder, it is connected with the wheel 305 of polishing to rotate in the mounting bracket 303, the wheel 305 of polishing becomes "king" font, the pivot of wheel 305 of polishing extends to the outside of a 303 top of mounting bracket, a 304 of top fixedly connected with motor of a 303 of mounting bracket, the output shaft and the pivot fixed connection of a 304 of motor.
The second clamping device 8 comprises a third bottom plate 801, a second sliding sleeve 802, a fourth air cylinder 803, a movable clamping block 804, a top plate 805, a second sliding rod 806, a first fixed clamping block 807, a fixed plate 808, a threaded sleeve 809 and a fixed block 810, wherein the second sliding sleeve 802 is fixedly installed on both sides of the bottom of the third bottom plate 801, the threaded sleeve 809 is fixedly installed at the middle position of the bottom of the third bottom plate 801, the two second sliding sleeves 802 are sleeved on the first sliding rod 2, the threaded sleeve 809 is installed on the screw rod 13, the fixed plate 808 is fixedly connected to the middle of the top of the third bottom plate 801, the fixed clamping block 807 is fixedly connected to one side of the top of the fixed plate 808, the fixed block 810 is fixedly connected to the other side of the top of the fixed plate 808, the fourth air cylinder 803 is fixedly installed on one side of the fixed block 810, the piston rod of the fourth air, a second sliding rod 806 is fixedly connected between the fixed clamping block 807 and the fixed block 810, a movable clamping block 804 is sleeved on the second sliding rod 806, the bottom of the movable clamping block 804 is in sliding connection with the fixed plate 808, and a top plate 805 is installed in the movable clamping block 804 and the fixed clamping block 807.
The cutting mechanism 6 comprises a bottom frame 601, a second cylinder 602, a rotating frame 603, a second motor 604, a connecting block 605, a saw blade 606 and an installation box 607, the connecting block 605 is fixedly connected to the top of the workbench 1, the top of the workbench 1 is close to the bottom frame 601 fixedly connected to the position of one side of the connecting block 605, the bottom frame 601 is rotatably connected with the second cylinder 602, the top of the connecting block 605 is rotatably connected with the rotating frame 603, the installation box 607 fixedly connected to one side of the rotating frame 603 is provided with the saw blade 606, and the other side of the rotating frame 603 is fixedly connected to the top of the second cylinder 602.
The structure of the second clamping device 8 is the same as that of the first clamping device 4, a transverse groove is formed in the middle of the movable clamping block 804 and the fixed clamping block 807 in the first clamping device 4, and a gap is formed between the mounting block 707, the second mounting frame 702 and the second bottom plate 701.
The working method of the cutting and grinding device comprises the following steps:
1) the H-shaped steel penetrates through the cutting and polishing device and is placed into the cutting and polishing device, the cylinder III 708 is started, the rotating wheel II 711 pushes the H-shaped steel to the rotating wheel I706, the motor III 703 rotates, and the rotating wheel I706 is driven by the transmission of the gear I704 and the gear II 705, so that the H-shaped steel moves to one side of the cutting mechanism 6;
2) after the cutting position of the H-shaped steel is adjusted, a fourth air cylinder 803 is started, the fourth air cylinder 803 pushes a movable clamping block 804 to move, the H-shaped steel is pushed to a fixed clamping block 807, the H-shaped steel is clamped, an adjusting bolt 811 is rotated, a top plate 805 is lifted, and the H-shaped steel is jacked;
3) after the H-shaped steel is clamped, the second motor 604 is started, the saw blade 606 rotates rapidly, the second cylinder 602 is started, the installation box 607 is pushed to move anticlockwise, and the H-shaped steel is cut off.
4) After the H-shaped steel is cut off, the first air cylinder 302 is started, the grinding wheels 305 on the two sides are closed to the middle position, the notch of the H-shaped steel is wrapped, the first motor 304 is started, the grinding wheels 305 rotate fast, the notch of the H-shaped steel is ground, and burrs are removed.
The working principle of the invention is as follows:
1. the invention adopts V, Ti microalloying, which can improve the hardenability of steel, has strengthening effect when dissolved in ferrite, and can form stable carbide, in addition, the invention strictly controls the content of C element, because the ductile-brittle transition temperature is improved along with the increase of C content, and the reduction of C content is also beneficial to improving the welding performance of steel, and simultaneously V can be largely precipitated at lower temperature, thereby playing the role of improving the strength.
2. H-shaped steel is put into the cutting and polishing device in a penetrating mode, a third air cylinder 708 is started, a second rotating wheel 711 pushes the H-shaped steel to a first rotating wheel 706, a third motor 703 rotates, and the first rotating wheel 706 is driven through the transmission of a first gear 704 and a second gear 705, so that the H-shaped steel moves to one side of the cutting mechanism 6; after the cutting position of the H-shaped steel is adjusted, a fourth air cylinder 803 is started, the fourth air cylinder 803 pushes a movable clamping block 804 to move, the H-shaped steel is pushed to a fixed clamping block 807, the H-shaped steel is clamped, an adjusting bolt 811 is rotated, a top plate 805 is lifted, and the H-shaped steel is jacked; after the H-shaped steel is clamped, a second motor 604 is started, a saw blade 606 rotates rapidly, a second cylinder 602 is started, the installation box 607 is pushed to move anticlockwise, and the H-shaped steel is cut off; after the H-shaped steel is cut off, the first air cylinder 302 is started, the grinding wheels 305 on the two sides are closed to the middle position, the notch of the H-shaped steel is wrapped, the first motor 304 is started, the grinding wheels 305 rotate fast, the notch of the H-shaped steel is ground, and burrs are removed.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (8)
1. The low-temperature-resistant H-shaped steel is characterized by comprising the following chemical components in percentage by weight: 0.05-0.11% of C, 0.20-0.35% of Si, 1.05-1.30% of Mn, less than or equal to 0.010% of P, less than or equal to 0.015% of S, 0.020-0.035% of Nb0.005-0.025% of Ti, 0.02-0.05% of V, 0.03-0.05% of Nb, and the balance of Fe and trace impurities, wherein the low-temperature resistant H-shaped steel is prepared by the following steps:
s1, molten iron pretreatment: adding a desulfurizing agent into the molten iron tank for desulfurization treatment, controlling the sulfur content of the molten iron to be below 0.020 wt%, and simultaneously completely removing slag on the surface of the molten iron after desulfurization is finished;
s2, smelting in a converter: alloying and deoxidizing the molten iron, and adjusting the content of V in the molten iron to be 0.020-0.070 wt%;
s3, LF refining: firstly, controlling the oxygen content in the molten steel to be below 45ppm, and then adjusting the Ti content in the molten steel to 0.005-0.025 wt%;
s4, continuous casting: semi-protective pouring is adopted for continuous casting, and a continuous casting billet with a good surface without crack defects is obtained;
s5, hot rolling: slowly cooling the continuous casting slab obtained after continuous casting, heating the continuous casting slab to 1200-1250 ℃, soaking, and after rough rolling and finish rolling, controlling the finish rolling temperature to 860-900 ℃; naturally cooling the rolled piece to 700-750 ℃, and then carrying out vertical cooling to obtain hot-rolled H-shaped steel;
and S6, correcting the hot-rolled H-shaped steel obtained in the S5, conveying the hot-rolled H-shaped steel to one side through a cutting and polishing device, conveying the H-shaped steel to the one side through two conveying mechanisms (7), clamping the H-shaped steel by a first clamping device (4) and a second clamping device (8) when the H-shaped steel reaches a cutting position, cutting the H-shaped steel by matching with a cutting mechanism (6), and finally removing burrs through a polishing mechanism (3) to obtain H-shaped steel products with equal length.
2. The production process of the low-temperature-resistant H-shaped steel is characterized in that the low-temperature-resistant H-shaped steel is prepared by the following steps:
s1, molten iron pretreatment: adding a desulfurizing agent into the molten iron tank for desulfurization treatment, controlling the sulfur content of the molten iron to be below 0.020 wt%, and simultaneously completely removing slag on the surface of the molten iron after desulfurization is finished;
s2, smelting in a converter: alloying and deoxidizing the molten iron, and adjusting the content of V in the molten iron to be 0.020-0.070 wt%;
s3, LF refining: firstly, controlling the oxygen content in the molten steel to be below 45ppm, and then adjusting the Ti content in the molten steel to 0.005-0.025 wt%;
s4, continuous casting: semi-protective pouring is adopted for continuous casting, and a continuous casting billet with a good surface without crack defects is obtained;
s5, hot rolling: slowly cooling the continuous casting slab obtained after continuous casting, heating the continuous casting slab to 1200-1250 ℃, soaking, and after rough rolling and finish rolling, controlling the finish rolling temperature to 860-900 ℃; naturally cooling the rolled piece to 700-750 ℃, and then carrying out vertical cooling to obtain hot-rolled H-shaped steel;
s6, correcting the hot-rolled H-shaped steel obtained in the S5, and then passing the hot-rolled H-shaped steel through a cutting and polishing device.
3. The production process of the low temperature resistant H-shaped steel according to claim 2, wherein the cutting and grinding device in S6 comprises a workbench (1), a first sliding rod (2), a grinding mechanism (3), a first clamping device (4), a first mounting plate (5), a cutting mechanism (6), a conveying mechanism (7), a second clamping device (8), a second mounting plate (9), a connecting rod (10), a third mounting plate (11), a fourth motor (12) and a lead screw (13), wherein the first mounting plate (5) and the second mounting plate (9) are fixedly connected to two sides of the top of the workbench (1), the first sliding rod (2) is fixedly connected to two sides between the first mounting plate (5) and the second mounting plate (9), the lead screw (13) is rotatably connected to a middle position between the first mounting plate (5) and the second mounting plate (9), and the lead screw (13) extends to the outer side of the second mounting plate (9), the mounting plate II (9) is far away from four connecting rods (10) fixedly connected with one side of a clamping device II (8), the connecting rods (10) are distributed in a rectangular shape, the number of the connecting rods is four, the other side of the connecting rods (10) is fixedly connected with a mounting plate III (11), the other side of the mounting plate III (11) is fixedly connected with a motor IV (12), an output shaft of the motor IV (12) is fixedly connected with a lead screw (13), a clamping device I (4) and a clamping device II (8) are respectively installed on two sides of the lead screw (13), conveying mechanisms (7) are respectively installed between the clamping device I (4) and the clamping device II (8) and at one side of the top of the workbench (1) on the lead screw (13), the top of the workbench (1) is close to a cutting mechanism (6) fixedly connected with a grinding mechanism (3) at one side of the mounting plate I (5), the conveying mechanism (7) comprises a second bottom plate (701), a second mounting frame (702), a third motor (703), a first gear (704), a second gear (705), a first rotating wheel (706), an installation block (707), a third cylinder (708), a first sliding sleeve (709), a movable block (710) and a second rotating wheel (711), wherein the first sliding sleeve (709) is fixedly connected to two sides of the bottom of the second bottom plate (701), the first sliding sleeve (709) is sleeved on the first sliding rod (2), the conveying mechanism (7) is in sliding connection with the first sliding rod (2) through the first sliding sleeve (709), the second mounting frame (702) is fixedly connected to one side of the top of the second bottom plate (701), the third motor (704) is fixedly installed on one side of the second mounting frame (702), the first gear (704) is fixedly connected to an output shaft of the third motor (703), and the first rotating wheel (706) is rotatably connected to the other side of, the pivot of runner (706) extends to the mounting bracket two (702) outside, fixed mounting has gear two (705) in the pivot of runner (706), gear (704) and gear two (705) mesh mutually, top opposite side fixedly connected with installation piece (707) of bottom plate two (701), the mounting groove has been seted up to installation piece (707) middle department, sliding connection has movable block (710) in the mounting groove, one side fixedly connected with cylinder three (708) of installation piece (707), the piston rod of cylinder three (708) extends to in the mounting groove, fixed connection between the piston rod of cylinder three (708) and movable block (710), the rotation is connected with runner two (711) in movable block (710).
4. The production process of low temperature resistant H-shaped steel according to claim 3, the polishing mechanism (3) comprises a first bottom plate (301), a first air cylinder (302), a first mounting frame (303), a first motor (304) and a polishing wheel (305), both sides of the top of the workbench (1) are fixedly connected with a first bottom plate (301), the top of the first bottom plate (301) is connected with a first air cylinder (302), a piston rod of the first cylinder (302) is fixedly connected with a first mounting frame (303), a grinding wheel (305) is rotatably connected in the first mounting frame (303), the grinding wheel (305) is shaped like a Chinese character 'wang', the rotating shaft of the grinding wheel (305) extends to the outer side of the top of the first mounting frame (303), the top of the first mounting frame (303) is fixedly connected with a first motor (304), and an output shaft of the first motor (304) is fixedly connected with the rotating shaft.
5. The production process of the low temperature resistant H-shaped steel according to claim 3, characterized in that the second clamping device (8) comprises a third bottom plate (801), a second sliding sleeve (802), a fourth cylinder (803), a movable clamping block (804), a top plate (805), a second sliding rod (806), a fixed clamping block (807), a fixed plate (808), threaded sleeves (809) and a fixed block (810), wherein the second sliding sleeve (802) is fixedly installed on both sides of the bottom of the third bottom plate (801), the threaded sleeves (809) are fixedly installed in the middle of the bottom of the third bottom plate (801), the two second sliding sleeves (802) are sleeved on the first sliding rod (2), the threaded sleeves (809) are installed on a lead screw (13), the middle of the top of the third bottom plate (801) is fixedly connected with the fixed plate (808), and the fixed clamping block (807) is fixedly connected to one side of the top of the fixed plate (808), the top opposite side fixedly connected with fixed block (810) of fixed plate (808), one side fixed mounting of fixed block (810) has cylinder four (803), the piston rod of cylinder four (803) extends to the opposite side of fixed block (810), the piston rod fixedly connected with fixed block (810) of cylinder four (803), fixedly connected with slide bar two (806) between fixed clamp splice (807) and fixed block (810), the activity clamp splice (804) has been cup jointed on slide bar two (806), sliding connection between the bottom of activity clamp splice (804) and fixed plate (808), install roof (805) in activity clamp splice (804) and fixed clamp splice (807).
6. The production process of low temperature resistant H-shaped steel according to claim 3, the cutting mechanism (6) comprises a bottom frame (601), a second air cylinder (602), a rotating frame (603), a second motor (604), a connecting block (605), a saw blade (606) and a mounting box (607), the connecting block (605) is fixedly connected with the top of the workbench (1), the position of the top of the workbench (1) close to one side of the connecting block (605) is fixedly connected with an underframe (601), a second air cylinder (602) is rotatably connected on the bottom frame (601), a rotating frame (603) is rotatably connected at the top of the connecting block (605), one side of the rotating frame (603) is fixedly connected with a mounting box (607), one side of the mounting box (607) is provided with a saw blade (606), the other side of the rotating frame (603) is fixedly connected with the top of the second air cylinder (602).
7. The production process of the low-temperature-resistant H-shaped steel according to claim 3, wherein the structure of the second clamping device (8) is the same as that of the first clamping device (4), transverse grooves are formed in the middle positions of the movable clamping block (804) and the fixed clamping block (807) in the first clamping device (4), and gaps are formed between the mounting block (707) and the second mounting frame (702) and the second bottom plate (701).
8. The production process of the low-temperature-resistant H-shaped steel according to claim 2, wherein the working method of the cutting and grinding device is as follows:
1) the H-shaped steel penetrates through the cutting and polishing device and is placed into the cutting and polishing device, the cylinder III (708) is started, the rotating wheel II (711) pushes the H-shaped steel to the rotating wheel I (706), the motor III (703) rotates, and the rotating wheel I (706) is driven by the transmission of the gear I (704) and the gear II (705), so that the H-shaped steel moves to one side of the cutting mechanism (6);
2) after the cutting position of the H-shaped steel is adjusted, starting a cylinder IV (803), pushing a movable clamping block (804) to move by the cylinder IV (803), pushing the H-shaped steel to a fixed clamping block (807), clamping the H-shaped steel, rotating an adjusting bolt (811), lifting a top plate (805), and jacking the H-shaped steel;
3) after the H-shaped steel is clamped, a second motor (604) is started, a saw blade (606) rotates rapidly, a second cylinder (602) is started, an installation box (607) is pushed to move anticlockwise, and the H-shaped steel is cut off;
4) after the H-shaped steel is cut off, the first air cylinder (302) is started, the grinding wheels (305) on the two sides are closed to the middle position, the notch of the H-shaped steel is wrapped, the first motor (304) is started, the grinding wheels (305) rotate fast, the notch of the H-shaped steel is ground, and burrs are removed.
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Denomination of invention: A Low Temperature Resistant H-beam Steel and Its Production Process Effective date of registration: 20221121 Granted publication date: 20220503 Pledgee: Anhui Tongcheng rural commercial bank Limited by Share Ltd. Fan Gang sub branch Pledgor: ANHUI KINGYOUNG STRUCTURAL METAL WORK Co.,Ltd. Registration number: Y2022980022536 |
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