CN108188178B - Production process of pack-rolled wide thin plate - Google Patents
Production process of pack-rolled wide thin plate Download PDFInfo
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- CN108188178B CN108188178B CN201810111172.4A CN201810111172A CN108188178B CN 108188178 B CN108188178 B CN 108188178B CN 201810111172 A CN201810111172 A CN 201810111172A CN 108188178 B CN108188178 B CN 108188178B
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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
- B21B1/38—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 rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
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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
- B21B1/38—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 rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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Abstract
The invention discloses a production process of a pack-rolled wide sheet, which specifically comprises the following steps: (1) selecting blanks, cogging the selected blanks to 70-75mm, and then cutting the cogging plates to length; (2) milling the blank plate with the initial size; (3) grooving the surface of the lower blank, spraying a separant in the groove and drying the separant; (4) aligning and compounding the baked lower blank and the baked upper blank, and welding; (5) processing a blank boss; (6) placing the blank plate in a stepping heating furnace for heating; (7) descaling by high-pressure water; (8) widening and rolling by a 5000mm rolling mill; (9) straightening; (10) the invention relates to a plasma cutting plate separating device, which can solve the limitation of a CVC technology of a 5m rolling mill on the production of a wide thin plate with the width of less than 6mm on a roll gap and simultaneously solve the problems of high ladle curvature and large plate convexity of the wide thin plate with the width of less than 8 mm.
Description
Technical Field
The invention relates to a production process of a pack-rolled wide sheet.
Background
With the development of the steel market, the demand of the downstream customers for the thin plates with the width of less than 10mm is increased. In order to better adapt to the situation of the steel industry, south steel wide and thick plate factories not only produce thick plates, but also develop wide thin plates; at present, a thin plate with the width of 6mm is successfully developed and exceeds the lower limit of the thickness of the original product outline; but because of the limitation of the CVC technology of a 5m rolling mill, the wide sheet below 6mm can not be produced by using the conventional blank, the composite blank is manufactured by using the blank composite technology for carrying out the lap rolling production, and the wide sheet below 6mm is successfully and stably produced by the aspects of heating process, rolling schedule arrangement, plate convexity control, temperature model optimization, pre-straightening and straightening schedule and the like.
Disclosure of Invention
The invention aims to solve the technical problems that the CVC technology of a 5m rolling mill limits the production of wide thin plates with the width of less than 6mm on a roll gap, simultaneously solves the problems of high curvature and large plate convexity of the wide thin plates with the width of less than 8mm, and provides a production process of the lap-rolled wide thin plates aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: the production process of the pack-rolled wide sheet specifically comprises the following steps:
the method comprises the following steps: selecting a blank, cogging the blank with the hydrogen content lower than 2.2ppm to 75-85mm, and cutting the cogging plate to length, wherein the cogging plate has the technical requirement that the same plate difference is less than 0.2mm and the unevenness is less than 3mm when the measured length is 1 m;
step two: milling the blank plate with the initial fixed size, wherein the milling depth and the milling speed are controlled in the milling process, specifically, the milling depth cut is less than 3mm, the feeding speed is 600-;
step three: grooving the surface of the lower blank, wherein the grooving depth is 1.5-2.5mm, spraying a separating agent in the groove, baking the hot blank at the temperature of 250 ℃ by using 150-;
step four: aligning and compounding the baked lower blank and the baked upper blank, and then welding;
step five: processing a blank boss: after welding in the fourth step, milling bosses existing on four composite edges of the lower blank and the upper blank by finish machining to enable the difference value of the diagonal lines of the upper surface and the lower surface of the composite blank to be less than 10mm, and ensuring the rectangle degree of the blank;
step six: placing the composite blank in a stepping heating furnace, wherein the tapping temperature is 1200-1220 ℃, the total heating time is 150-240 minutes, the soaking time is 20-40 minutes, and the uniformity is 0-10 ℃;
step seven: descaling by high-pressure water: after heating, performing high-pressure water descaling on the blank, enabling the blank to pass through a dephosphorizing machine at the speed of 1.0m/s, and controlling the water pressure to be 22-24 Mpa;
step eight: widening and rolling by a 5000mm rolling mill: after the blank is taken out of a descaler, the blank is sent to a rolling mill through a roller way at the speed of 1-3m/s, the blank is rolled by adopting the process of 9-pass forming, the rolling temperature is higher than 1050 ℃, the forming is carried out in the 1 st pass, the reduction is 20-35 mm/pass, the widening is carried out in the 2 nd and 3 rd passes, and the reduction is 10-25 mm/pass; carrying out longitudinal rolling on the widened 4 th to 9 th passes to reach a target thickness, and sequentially decreasing the rolling reduction of the 4 th to 9 th passes along with the increase of the number of the passes;
step nine: straightening for 3-5 times with straightening force of 50-60 tons by a pre-straightening machine after rolling, cooling according to the need, starting cooling water for rapid cooling if water cooling is needed, wherein the cooling water ratio is more than 1.3, and the acceleration is more than 0.01m/s2If water cooling is not needed, the water directly passes through the filter;
step ten: and cutting the board by a plasma cutting machine.
The invention further defines the scheme:
in the second step, the milling depth cutting amount is 2mm, and the feeding speed is 700 mm/min.
And in the third step, the surface of the lower blank is grooved, the grooving depth is 2mm, a separant is sprayed in the groove, the blank is baked by using a hot blank at the temperature of 200 ℃, and the separant is dried.
Aligning and compounding the baked lower blank and the baked upper blank, welding by using an electron beam welding gun in a vacuum environment below 0.01pa, reinforcing a beam of the welding gun before production, wherein the curvature of the reinforced beam in the length of 1m is less than 0.5mm, preheating the blank by using a process of focusing 100mmA above the electron beam welding gun, beam current 200mA and advancing speed 200mm/min before welding, immediately welding after preheating, and performing stress relief treatment on a welding seam by using a process of preheating by using the welding gun after welding.
And step four, aligning and compounding the baked lower blank and the baked upper blank, welding the composite blank by adopting submerged arc welding, forming a hole with the diameter of 16mm at a welding seam after welding, pumping to the vacuum degree of below 10pa, and then performing negative pressure plugging on the vacuumized conduit.
In the sixth step, the tapping temperature is 1220 ℃, the total heating time is 160 minutes, the soaking time is 30 minutes, and the uniformity is 5 ℃.
In the eighth step, finish descaling is required to be performed before the first pass, the second pass, the third pass, the fourth pass and the fourth pass in the step 1, the fourth pass, the fifth pass and the sixth pass in the step 5, and the fourth pass is performed before the first pass, the fourth pass, the fifth pass and the sixth pass are performed after the second pass, and the.
And in the eighth step, the blank is rotated by 90 degrees for rolling before the 2 nd and 4 th passes of rolling.
And e, performing longitudinal rolling on the widened product in the step eight in the 4 th to 9 th passes to obtain the target thickness, wherein the rolling reduction of the 4 th to 7 th passes is 6-30 mm/pass, and the rolling reduction of the 8 th and 9 th passes is 2-5 mm/pass.
The method also comprises the processes of flaw detection, shot blasting, quenching and tempering and strong straightening.
The invention has the beneficial effects that: the milling depth and the milling speed are controlled in the milling process, so that the processing deformation of the blank can be effectively prevented;
according to the invention, the groove is formed on the surface of the lower blank, and the isolating agent is sprayed in the groove, so that the assembly process is simplified, and the production efficiency and the isolation quality are improved;
the lower blank and the upper blank which are baked are aligned and compounded, and then the lower blank and the upper blank are welded by a vacuum electron beam welding machine in a vacuum environment below 0.01pa, so that the sealing and fixing effects can be achieved, and meanwhile, a cross beam of the welding gun is reinforced before welding, so that the bending degree of the cross beam in the length of 1m is smaller than 0.5mm in the moving process of the welding gun, the problem of large welding depth fluctuation is solved, and the quality of a product is improved;
the invention can also adopt submerged arc welding to weld the composite blank, can increase the firmness of the welding seam, and can also reduce the requirement on the heating process in subsequent processing;
after welding, the bosses on the four composite edges of the lower blank and the upper blank are milled flat through finish machining, so that the rectangle degree of the blank is ensured, and the oblique angle of a rolled steel plate and the cracking of a welding seam in the steel gathering process are prevented;
the thickness of the wide thin plate produced by the pack rolling mode is less than 6mm, the width of the wide thin plate is more than 3200mm, the buckling rate of the wide thin plate is 1.3 percent and is far lower than the buckling rate of the commonly rolled wide thin plate, and meanwhile, the plate protrusion degree of the wide thin plate is less than 0.05mm and is also lower than the protrusion degree of the commonly rolled wide thin plate, so that the wide thin plate produced by the pack rolling mode is obviously better than the commonly rolled wide thin plate.
Detailed Description
Example 1
The embodiment provides a production process of a pack-rolled wide sheet, which specifically comprises the following steps:
the method comprises the following steps: selecting a blank, cogging the blank with the hydrogen content of 2ppm to 75mm, and cutting the cogging plate to length, wherein the technological requirement of the cogging plate is that the same plate difference is 0.18mm, and the unevenness is 2.5mm when the measured length is 1 m;
step two: milling the blank plate with the initial size, wherein the milling depth and the milling speed are controlled in the milling process, specifically, the milling depth consumption is 2.5mm, the feeding speed is 700mm/min, and the milling direction needs to be carried out in a reciprocating manner along the same axial direction;
step three: grooving the surface of the lower blank, wherein the grooving depth is 2mm, spraying a separant into the groove, baking the hot blank at 200 ℃, and drying the separant;
step four: aligning and compounding the baked lower blank and the baked upper blank, then welding by adopting an electron beam welding gun in a vacuum environment of 0.008pa, reinforcing a beam of the welding gun before welding, wherein the curvature of the reinforced beam in the length of 1m is 0.4mm, preheating the blank by using a process of focusing 100mmA above the electron beam welding gun, using 200mA beam and using 200mm/min forward speed, immediately welding after preheating, and performing stress relief treatment on a welding seam by using a welding gun for preheating;
step five: processing a blank boss: after welding in the fourth step, milling bosses existing on four composite edges of the lower blank and the upper blank by finish machining to enable the diagonal difference value of the upper surface and the lower surface of the composite blank to be 5mm, and ensuring the rectangle degree of the blank;
step six: placing the composite blank with the size of 135 x 2700 x 3000mm (thickness, width and length) in a stepping heating furnace, wherein the tapping temperature is 1220 ℃, the total in-furnace time is 200 minutes, the soaking time is 25 minutes, and the uniformity is 3 ℃;
step seven: descaling by high-pressure water: after heating, performing high-pressure water descaling on the blank, enabling the blank to pass through a dephosphorizing machine at the speed of 1.0m/s, and controlling the water pressure to be 23 Mpa;
step eight: widening and rolling by a 5000mm rolling mill: after the blank is taken out of a descaler, the blank is sent to a rolling mill through a roller way at the speed of 2m/s, the blank is rolled by adopting the process of 9-pass forming, the rolling temperature is 1070 ℃, fine descaling is required before the rolling of the 1 st, 4 th, 5 th and 6 th passes, the descaling pressure is 23Mpa, the blank is rotated by 90 degrees for rolling before the rolling of the 2 nd and 4 th passes, wherein the forming is carried out on the 1 st pass, the reduction is 28 mm/pass, the widening is carried out on the 2 nd and 3 rd passes, and the reduction is 16 mm/pass; performing longitudinal rolling on the widened 4 th to 9 th passes to reach a target thickness, and sequentially decreasing the rolling reduction of the 4 th to 9 th passes along with the increase of the number of the passes, wherein the rolling reduction of the 4 th to 9 th passes is 23 mm/pass, 20 mm/pass, 15 mm/pass, 11 mm/pass, 4 mm/pass and 2 mm/pass respectively;
step nine: straightening for 3 times by a pre-straightening machine with straightening force of 55 tons after rolling, cooling by water after straightening, wherein the cooling water ratio is 1.35, the acceleration is 0.015m/s2,
step ten: cutting and splitting the plate by a plasma cutting machine, detecting a flaw according to the GB/T2970 standard, delivering qualified products of level II, performing shot blasting under the pressure of 0.5Mpa, quenching and tempering: quenching and heating at 905 ℃, cooling to room temperature in a furnace for 90 min; tempering and heating at 630 ℃, keeping the temperature in the furnace for 42min, air-cooling to room temperature, and strongly straightening for 3 times.
Example 2
The production process of the pack-rolled wide sheet specifically comprises the following steps:
the method comprises the following steps: selecting a blank, cogging the blank with the hydrogen content of 2ppm to 80mm, and cutting the cogging plate to length after the cogging plate is subjected to fire cutting, wherein the technical requirement of the cogging plate is that the same plate difference is 0.15mm, and the unevenness is 2mm when the measured length is 1 m;
step two: milling the blank plate with the initial fixed size, wherein the milling depth and the milling speed are controlled in the milling process, specifically, the milling depth cut is 2.2mm, the feeding speed is 740mm/min, and the milling direction needs to be carried out in a reciprocating mode along the same axial direction;
step three: grooving the surface of the lower blank, wherein the grooving depth is 1.5mm, spraying a separant into the groove, baking the hot blank at 180 ℃, and drying the separant;
step four: aligning and compounding the baked lower blank and the baked upper blank, welding the composite blank by adopting submerged arc welding, forming a hole with the diameter of 16mm at a welding seam after welding, pumping to the vacuum degree below 10pa, and then performing negative pressure plugging on the vacuumized conduit;
step five: processing a blank boss: after welding in the fourth step, milling bosses existing on four composite edges of the lower blank and the upper blank by finish machining to enable the diagonal difference value of the upper surface and the lower surface of the composite blank to be 4mm, and ensuring the rectangle degree of the blank;
step six: placing the composite blank with the size of 145 x 2770 x 2500 (thickness x width x length) in a stepping heating furnace, wherein the tapping temperature is 1210 ℃, the total in-furnace time is 220 minutes, the soaking time is 30 minutes, and the uniformity is 0 ℃;
step seven: descaling by high-pressure water: after heating, performing high-pressure water descaling on the blank, enabling the blank to pass through a dephosphorization machine at the speed of 1.0/s, and controlling the water pressure to be 24 Mpa;
step eight: widening and rolling by a 5000mm rolling mill: after the blank is taken out of a descaler, the blank is sent to a rolling mill through a roller way at the speed of 2m/s, the blank is rolled by adopting the process of 9-pass forming, the rolling temperature is 1085 ℃, fine descaling is required before the rolling of the 1 st, 4 th, 5 th and 6 th passes, the descaling pressure is 24Mpa, the blank is rotated by 90 degrees for rolling before the rolling of the 2 nd and 4 th passes, the forming is carried out on the 1 st pass, the reduction is 31 mm/pass, the widening is carried out on the 2 nd and 3 rd passes, and the reduction is 16 mm/pass; performing longitudinal rolling on the widened 4 th to 9 th passes to reach a target thickness, and sequentially decreasing the rolling reduction of the 4 th to 9 th passes along with the increase of the number of the passes, wherein the rolling reduction of the 4 th to 9 th passes is respectively 25 mm/pass, 22 mm/pass, 18 mm/pass, 10 mm/pass, 5 mm/pass and 2 mm/pass;
step nine: straightening for 5 times by a pre-straightening machine with straightening force of 52 tons after rolling, and cooling in air without boiled water after straightening;
step ten: cutting and splitting the plate by a plasma cutting machine, detecting the flaw according to the GB/T2970 standard, delivering the qualified product of level II, and straightening for 5 times by a cold straightening machine.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (10)
1. A production process of a pack-rolled wide sheet is characterized by comprising the following steps: the method specifically comprises the following steps:
the method comprises the following steps: selecting a blank, cogging the blank with the hydrogen content lower than 2.2ppm to 75-85mm, and cutting the cogging plate to length, wherein the cogging plate has the technical requirement that the same plate difference is less than 0.2mm and the unevenness is less than 3mm when the measured length is 1 m;
step two: milling the blank plate with the initial fixed size, wherein the milling depth and the milling speed are controlled in the milling process, specifically, the milling depth cut is less than 3mm, the feeding speed is 600-;
step three: grooving the surface of the lower blank, wherein the grooving depth is 1.5-2.5mm, spraying a separating agent in the groove, baking the hot blank at the temperature of 250 ℃ by using 150-;
step four: aligning and compounding the baked lower blank and the baked upper blank, and then welding;
step five: processing a blank boss: after welding in the fourth step, milling bosses existing on four composite edges of the lower blank and the upper blank by finish machining to enable the difference value of the diagonal lines of the upper surface and the lower surface of the composite blank to be less than 10mm, and ensuring the rectangle degree of the blank;
step six: heating the composite blank in a stepping heating furnace, wherein the tapping temperature is 1200 ℃ plus 1220 ℃, the total heating time is 150 minutes plus 240 minutes, the soaking time is 20-40 minutes, and the uniformity is 0-10 ℃;
step seven: descaling by high-pressure water: after heating, performing high-pressure water descaling on the blank, enabling the blank to pass through a dephosphorizing machine at the speed of 1.0m/s, and controlling the water pressure to be 22-24 Mpa;
step eight: widening and rolling by a 5000mm rolling mill: after the blank is taken out of a descaler, the blank is sent to a rolling mill through a roller way at the speed of 1-3m/s, the blank is rolled by adopting the process of 9-pass forming, the rolling temperature is higher than 1050 ℃, the forming is carried out in the 1 st pass, the reduction is 20-35 mm/pass, the widening is carried out in the 2 nd and 3 rd passes, and the reduction is 10-25 mm/pass; carrying out longitudinal rolling on the widened 4 th to 9 th passes to reach a target thickness, and sequentially decreasing the rolling reduction of the 4 th to 9 th passes along with the increase of the number of the passes;
step nine: straightening for 3-5 times with straightening force of 50-60 tons by a pre-straightening machine after rolling, cooling according to the need, starting cooling water for rapid cooling if water cooling is needed, wherein the cooling water ratio is more than 1.3, and the acceleration is more than 0.01m/s2If water cooling is not needed, the water directly passes through the filter;
step ten: and cutting the board by a plasma cutting machine.
2. The process for producing a pack-rolled wide sheet according to claim 1, wherein: and in the second step, the milling depth cutting amount is 2mm, and the feeding speed is 700 mm/min.
3. The process for producing a pack-rolled wide sheet according to claim 1, wherein: and in the third step, a groove is formed in the surface of the lower blank, the depth of the groove is 2mm, a separant is sprayed in the groove, the hot blank is baked at 200 ℃, and the separant is dried.
4. The process for producing a pack-rolled wide sheet according to claim 1, wherein: aligning and compounding the baked lower blank and the baked upper blank, welding by using an electron beam welding gun in a vacuum environment below 0.01pa, reinforcing a beam of the welding gun before production, wherein the curvature of the reinforced beam in the length of 1m is less than 0.5mm, preheating the blank by using a process of focusing 100mmA above the electron beam welding gun, beam current 200mA and advancing speed 200mm/min before welding, immediately welding after preheating, and performing stress relief treatment on a welding seam by using a process of preheating by using the welding gun immediately after welding.
5. The process for producing a pack-rolled wide sheet according to claim 1, wherein: and step four, aligning and compounding the baked lower blank and the baked upper blank, welding the composite blank by adopting submerged arc welding, forming a hole with the diameter of 16mm at the welding seam after welding, pumping to the vacuum degree of below 10pa, and then performing negative pressure plugging on the welding seam of the submerged arc welding on the vacuumized conduit, wherein the welding seam is firmer and the requirement on the heating process is lower.
6. The process for producing a pack-rolled wide sheet according to claim 1, wherein: in the sixth step, the tapping temperature is 1220 ℃, the total heating time is 160 minutes, the soaking time is 25 minutes, and the uniformity is 3 ℃.
7. The process for producing a pack-rolled wide sheet according to claim 1, wherein: and in the eighth step, fine descaling is required to be carried out before the first pass, the second pass, the third pass, the fourth pass and the fourth pass of the rolling in the steps 1, 4, 5 and 6, and the descaling pressure is greater than 23 MPa.
8. The process for producing a pack-rolled wide sheet according to claim 1, wherein: and in the eighth step, the blank is rotated by 90 degrees for rolling before the 2 nd and 4 th passes of rolling.
9. The process for producing a pack-rolled wide sheet according to claim 1, wherein: and eighthly, performing longitudinal rolling on the steel plate in the 4 th to 9 th passes after widening in the step eight to obtain the target thickness, wherein the rolling reduction of the 4 th to 7 th passes is 6-30 mm/pass, and the rolling reduction of the 8 th and 9 th passes is 2-5 mm/pass.
10. The process for producing a pack-rolled wide sheet according to claim 1, wherein: also comprises the processes of flaw detection, shot blasting, quenching and tempering and strong straightening.
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