CN102974612B - Process for rolling thin low-temperature tank box steel plate by using rolling machine with single machine frame furnace - Google Patents
Process for rolling thin low-temperature tank box steel plate by using rolling machine with single machine frame furnace Download PDFInfo
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Abstract
The invention discloses a process for rolling a thin low-temperature tank box steel plate by using a rolling machine with a single machine frame furnace. The low-temperature tank box steel plate of which the thickness is less than or equal to 11mm is formed by rolling a plate blank of which the thickness is 150mm. The process comprises the following steps of coldly or hotly loading the plate blank in a storehouse, heating the plate blank in a heating furnace, crudely removing scales, finely removing the scales, rolling the plate blank by using a furnace rolling machine, cutting the head or sectioning by using a pair of flying shears, cooling with laminar flow, straightening by using a hot straightening machine, performing air cooling by using a cooling bed, checking the lower surface of a steel plate, cutting two sides, sectioning or sampling by cutting to length, spraying steel seal, stacking the products, and storing the finished products in the warehouse, wherein the temperature for delivering the steel plate from the heating furnace is 1,150 to 1,230 DEG C, the temperature of a rolling furnace in front of the machine and the temperature of a rolling furnace behind the machine are set to be 850 to 950 DEG C, the rolling times is 11, two rolling steps are performed, flat rolling is performed in the first step for 7 times, and rolling is performed in the second step for 4 times. The requirement of refining and organizing crystalline grains can be met according to the plate produced by the invention, and meanwhile, the shape and the performance of the plate are ensured.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of production technology of steel plate, the technique of the thin specification cryogenic tank of a kind of single chassis steekle mill rolling specifically case steel plate.
Background technology
When heavy and medium plate mill is produced the following thin specification cryogenic tank case steel plate of 11mm, along with steel plate rolling thickness is more and more thinner, steel plate temperature drop is more and more faster, especially steel plate thermal gradient energy end to end reaches 120 DEG C, and steel plate is gone up along its length, and Temperature Distribution is extremely inhomogeneous, this is the insoluble problem of field of metallurgy, cause serious consequence: the one, steel plate rolling power exceedes maximum limit, or the poor generation of steel-plate shape stops soon, finally causes steel plate to roll useless; The 2nd, affect overall performance and the milled sheet shape of rolled piece.
Cryogenic tank case steel is for the pressure vessel of the various media such as low-temperature liquid tank case such as accumulating liquid nitrogen, liquid argon, to production and steel plate require highly, manufacture now the almost all imports of the required steel plate of cryogenic tank case.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of prior art, proposes the technique of the thin specification cryogenic tank of a kind of single chassis steekle mill rolling case steel plate, can ensure thin specification cryogenic tank case steel plate integral slab shape and high-performance.
The technical scheme that the present invention solves above technical problem is:
The technique of the thin specification cryogenic tank of a kind of single chassis steekle mill rolling case steel plate, at the cryogenic tank case steel plate of the slab rolling thickness≤11mm that is 150mm with thickness, technological process is: and slab storehouse cold charge or hot charging → heating furnace heating → thick de-scaling → smart de-scaling → steekle mill rolling → flying shear crop or segmentation → laminar flow be cooling → and the inspection → bilateral scissors trimming → fixed size scissors segmentation of thermal straightening machine aligning → cold bed air cooling → lower surface of steel plate or sampling → spray word steel seal → stacking → finished product put in storage;
In heating furnace heating process, heating furnace tapping temperature: 1150-1230 DEG C;
In thick de-scaling operation, adopt high-pressure water descaling, remove at furnace outlet the iron scale that once heating causes, nozzle hydraulic pressure 20-22Mpa, descaling jet is rotating 360 degrees on steel billet;
In essence de-scaling operation, adopt high-pressure water descaling, be provided with secondary descaling steel nozzle and remove the secondary and three iron scales that in rolling heating and thermal insulation process, produce before and after milling train, nozzle hydraulic pressure is greater than 22Mpa, and descaling jet is rotating 360 degrees on steel billet;
In steekle mill rolling process, before machine, after coiler furnace and machine, coiler furnace Temperature Setting is 850-950 DEG C, and rolling pass is 11 passages, is divided into two rolling sequences: 7 passages of one-phase flat-rolled, 4 passages of two-stage rolling; Reduction in pass second from the bottom is 19-21%, last reduction in pass 9-12%; Finish to gauge speed is 1.45-1.55m/s, and last passage (the 7th passage) roll-force of flat-rolled is 4500 tons ± 50 tons, and the first passage (the 8th passage) roll-force that rolling starts is 4600 tons ± 50 tons;
In flying shear crop or segmentation operation, flying shear is used for shearing the head of rolled piece hypertrophy, or for sector boss rolled piece (length is greater than 50m steel plate), shear rate 1.0-2.25m/s;
In refrigerating work procedure, be that the steel plate after hot rolling is cooled to room temperature immediately;
In thermal straightening machine aligning operation, refer to that the bent steel plate that wafts after hot rolling is aligned through straightener one or many, become straight steel plate, straightening temperature 450-1000 DEG C;
In cold bed air cooling operation, be evenly cooled to after 140 DEG C degrees Celsius, control cold bed under motherboard.
The technical scheme that the present invention further limits is:
The technique of the thin specification cryogenic tank of aforesaid single chassis steekle mill rolling case steel plate, in refrigerating work procedure, adopt the cooling method of being combined with air cooling of laminar flow, first adopt the cooling cooldown rate with 1～2 DEG C/s of laminar flow by steel plate water-cooled to 700-720 DEG C, then air cooling is to 650-670 DEG C, adopt again the cooling cooldown rate with 4～5 DEG C/s of laminar flow by steel plate water-cooled to 500-550 DEG C, then adopt the cooling cooldown rate with 1～2 DEG C/s of laminar flow by steel plate water-cooled to 400-450 DEG C, last air cooling is to room temperature.Like this, by the cooling method of being combined with air cooling of laminar flow, first with slower cooling velocity water-cooled, then carry out air cooling, last again by fast slow water-cooled and an air cooling, thus logically can improve the toughness of steel and obtain good comprehensive mechanical property (specifically can see below the mechanical property of invention advantage part), not only can improve the quality of products, and can save mass energy consumption, reduce production costs.The mechanical property of the steel plate after rolling is: yield strength: 260～330 MPa, tensile strength: 350～410MPa, percentage elongation: 32～40%.
The invention has the beneficial effects as follows: the present invention is by controlling tapping temperature, coiler furnace temperature, reduction in pass, roll-force, finish to gauge speed, dephosphorization system, ensure thin specification cryogenic tank case steel plate overall performance and plate shape, particularly by optimizing rolling parameter, increase the reduction in pass of former passages, reduce last several reduction in pass, and the roll-force of the each passage of reasonable distribution, meet the requirement of thinning microstructure crystal grain, ensure plate shape simultaneously.
The steel plate that the present invention produces can meet and exceed the requirement of the standard " standard criterion A20/A20M-2010 of steel heavy plate for pressure vessels General Requirement " of pressure from USA steel plate for container, the steel plate of supply should and have good surface without harmful defect, the performance of its steel plate and presentation quality substitute American-European imported steel completely, the mechanical performance index of its steel plate is yield strength: 260～330 MPa(standard >=175 MPa), tensile strength: 350～410MPa(standard, 320～450MPa), percentage elongation: 32～40 % (standard >=27%) >=27(gauge length 200mm), its surface of steel plate is without serious iron scale, surface of steel plate without bubble, scab, crackle, be mingled with and be pressed into the defects such as iron scale, surface of steel plate is without the defect such as pit, pockmark.
Detailed description of the invention
embodiment 1
The technique of the thin specification cryogenic tank of a kind of single chassis steekle mill rolling case steel plate, at the cryogenic tank case steel plate of the slab rolling thickness 11mm that is 150mm with thickness, technological process is: and slab storehouse cold charge or hot charging → heating furnace heating → thick de-scaling → smart de-scaling → steekle mill rolling → flying shear crop or segmentation → laminar flow be cooling → and the inspection → bilateral scissors trimming → fixed size scissors segmentation of thermal straightening machine aligning → cold bed air cooling → lower surface of steel plate or sampling → spray word steel seal → stacking → finished product put in storage;
In heating furnace heating process, heating furnace tapping temperature: 1150 DEG C;
In thick de-scaling operation, adopt high-pressure water descaling, remove at furnace outlet the iron scale that once heating causes, nozzle hydraulic pressure 20Mpa, descaling jet is rotating 360 degrees on steel billet;
In essence de-scaling operation, adopt high-pressure water descaling, before and after milling train, be provided with secondary descaling steel nozzle and remove the secondary and three iron scales that in rolling heating and thermal insulation process, produce, nozzle hydraulic pressure 25Mpa, descaling jet is rotating 360 degrees on steel billet;
In steekle mill rolling process, before machine, after coiler furnace and machine, coiler furnace Temperature Setting is 850 DEG C, and rolling pass is 11 passages, is divided into two rolling sequences: 7 passages of one-phase flat-rolled, 4 passages of two-stage rolling; Reduction in pass second from the bottom is 19-21%, last reduction in pass 9-12%; Finish to gauge speed is 1.45-1.55m/s, and last passage (the 7th passage) roll-force of flat-rolled is 4500 tons, and the first passage (the 8th passage) roll-force that rolling starts is 4600 tons;
In flying shear crop or segmentation operation, flying shear is used for shearing the head of rolled piece hypertrophy, or for sector boss rolled piece (length is greater than 50m steel plate), shear rate 1.0m/s;
In refrigerating work procedure, adopt the cooling method of being combined with air cooling of laminar flow, first adopt the cooling cooldown rate with 1 DEG C/s of laminar flow by steel plate water-cooled to 700 DEG C, then air cooling to 650 DEG C, adopt again the cooling cooldown rate with 4 DEG C/s of laminar flow by steel plate water-cooled to 500 DEG C, adopt the cooling cooldown rate with 1 DEG C/s of laminar flow by steel plate water-cooled to 400 DEG C, last air cooling is to room temperature again;
In thermal straightening machine aligning operation, refer to that the bent steel plate that wafts after hot rolling is aligned through straightener one or many, become straight steel plate, 450 DEG C of straightening temperatures;
In cold bed air cooling operation, be evenly cooled to after 140 DEG C degrees Celsius, control cold bed under motherboard.
The mechanical property of the steel plate after the present embodiment rolling is: yield strength: 260MPa, tensile strength: 350MPa, percentage elongation: 32%.
embodiment 2
The technique of the thin specification cryogenic tank of a kind of single chassis steekle mill rolling case steel plate, at the cryogenic tank case steel plate of the slab rolling thickness 10mm that is 150mm with thickness, technological process is: and slab storehouse cold charge or hot charging → heating furnace heating → thick de-scaling → smart de-scaling → steekle mill rolling → flying shear crop or segmentation → laminar flow be cooling → and the inspection → bilateral scissors trimming → fixed size scissors segmentation of thermal straightening machine aligning → cold bed air cooling → lower surface of steel plate or sampling → spray word steel seal → stacking → finished product put in storage;
In heating furnace heating process, heating furnace tapping temperature: 1200 DEG C;
In thick de-scaling operation, adopt high-pressure water descaling, remove at furnace outlet the iron scale that once heating causes, nozzle hydraulic pressure 21Mpa, descaling jet is rotating 360 degrees on steel billet;
In essence de-scaling operation, adopt high-pressure water descaling, before and after milling train, be provided with secondary descaling steel nozzle and remove the secondary and three iron scales that in rolling heating and thermal insulation process, produce, nozzle hydraulic pressure 28Mpa, descaling jet is rotating 360 degrees on steel billet;
In steekle mill rolling process, before machine, after coiler furnace and machine, coiler furnace Temperature Setting is 900 DEG C, and rolling pass is 11 passages, is divided into two rolling sequences: 7 passages of one-phase flat-rolled, 4 passages of two-stage rolling; Reduction in pass second from the bottom is 20%, last reduction in pass 10%; Finish to gauge speed is 1.50m/s, and last passage (the 7th passage) roll-force of flat-rolled is 4450 tons, and the first passage (the 8th passage) roll-force that rolling starts is 4550 tons;
In flying shear crop or segmentation operation, flying shear is used for shearing the head of rolled piece hypertrophy, or for sector boss rolled piece (length is greater than 50m steel plate), shear rate 1.5m/s;
In refrigerating work procedure, adopt the cooling method of being combined with air cooling of laminar flow, first adopt the cooling cooldown rate with 1 DEG C/s of laminar flow by steel plate water-cooled to 710 DEG C, then air cooling to 660 DEG C, adopt again the cooling cooldown rate with 5 DEG C/s of laminar flow by steel plate water-cooled to 520 DEG C, adopt the cooling cooldown rate with 1 DEG C/s of laminar flow by steel plate water-cooled to 420 DEG C, last air cooling is to room temperature again;
In thermal straightening machine aligning operation, refer to that the bent steel plate that wafts after hot rolling is aligned through straightener one or many, become straight steel plate, 600 DEG C of straightening temperatures;
In cold bed air cooling operation, be evenly cooled to after 140 DEG C degrees Celsius, control cold bed under motherboard.
The mechanical property of the steel plate after the present embodiment rolling is: yield strength: 300MPa, tensile strength: 380MPa, percentage elongation: 36%.
embodiment 3
The technique of the thin specification cryogenic tank of a kind of single chassis steekle mill rolling case steel plate, at the cryogenic tank case steel plate of the slab rolling thickness 8mm that is 150mm with thickness, technological process is: and slab storehouse cold charge or hot charging → heating furnace heating → thick de-scaling → smart de-scaling → steekle mill rolling → flying shear crop or segmentation → laminar flow be cooling → and the inspection → bilateral scissors trimming → fixed size scissors segmentation of thermal straightening machine aligning → cold bed air cooling → lower surface of steel plate or sampling → spray word steel seal → stacking → finished product put in storage;
In heating furnace heating process, heating furnace tapping temperature: 1230 DEG C;
In thick de-scaling operation, adopt high-pressure water descaling, remove at furnace outlet the iron scale that once heating causes, nozzle hydraulic pressure 22Mpa, descaling jet is rotating 360 degrees on steel billet;
In essence de-scaling operation, adopt high-pressure water descaling, before and after milling train, be provided with secondary descaling steel nozzle and remove the secondary and three iron scales that in rolling heating and thermal insulation process, produce, nozzle hydraulic pressure 30Mpa, descaling jet is rotating 360 degrees on steel billet;
In steekle mill rolling process, before machine, after coiler furnace and machine, coiler furnace Temperature Setting is 950 DEG C, and rolling pass is 11 passages, is divided into two rolling sequences: 7 passages of one-phase flat-rolled, 4 passages of two-stage rolling; Reduction in pass second from the bottom is 21%, last reduction in pass 9-12%; Finish to gauge speed is 1.55m/s, and last passage (the 7th passage) roll-force of flat-rolled is 4550 tons, and the first passage (the 8th passage) roll-force that rolling starts is 4650 tons;
In flying shear crop or segmentation operation, flying shear is used for shearing the head of rolled piece hypertrophy, or for sector boss rolled piece (length is greater than 50m steel plate), shear rate 2.25m/s;
In refrigerating work procedure, adopt the cooling method of being combined with air cooling of laminar flow, first adopt the cooling cooldown rate with 2 DEG C/s of laminar flow by steel plate water-cooled to 720 DEG C, then air cooling to 670 DEG C, adopt again the cooling cooldown rate with 5 DEG C/s of laminar flow by steel plate water-cooled to 550 DEG C, adopt the cooling cooldown rate with 2 DEG C/s of laminar flow by steel plate water-cooled to 450 DEG C, last air cooling is to room temperature again;
In thermal straightening machine aligning operation, refer to that the bent steel plate that wafts after hot rolling is aligned through straightener one or many, become straight steel plate, 1000 DEG C of straightening temperatures;
In cold bed air cooling operation, be evenly cooled to after 140 DEG C degrees Celsius, control cold bed under motherboard.
The mechanical property of the steel plate after the present embodiment rolling is: yield strength: 330MPa, tensile strength: 410MPa, percentage elongation: 40%.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (2)
1. the technique of the thin specification cryogenic tank of single chassis steekle mill rolling case steel plate, the cryogenic tank case steel plate of the slab rolling thickness≤11mm that is 150mm with thickness, technological process is: and slab storehouse cold charge or hot charging → heating furnace heating → thick de-scaling → smart de-scaling → steekle mill rolling → flying shear crop or segmentation → laminar flow be cooling → and the inspection → bilateral scissors trimming → fixed size scissors segmentation of thermal straightening machine aligning → cold bed air cooling → lower surface of steel plate or sampling → spray word steel seal → stacking → finished product put in storage;
In described heating furnace heating process, heating furnace tapping temperature: 1150-1230 DEG C;
In described thick de-scaling operation, adopt high-pressure water descaling, remove at furnace outlet the iron scale that once heating causes, nozzle hydraulic pressure 20-22Mpa, descaling jet is rotating 360 degrees on steel billet;
In described smart de-scaling operation, adopt high-pressure water descaling, be provided with secondary descaling steel nozzle and remove the secondary and three iron scales that in rolling heating and thermal insulation process, produce before and after milling train, nozzle hydraulic pressure is greater than 22Mpa, and descaling jet is rotating 360 degrees on steel billet;
In described steekle mill rolling process, before machine, after coiler furnace and machine, coiler furnace Temperature Setting is 850-950 DEG C, and rolling pass is 11 passages, is divided into two rolling sequences: 7 passages of one-phase flat-rolled, 4 passages of two-stage rolling; Reduction in pass second from the bottom is 19-21%, last reduction in pass 9-12%; Finish to gauge speed is 1.45-1.55m/s, and last passage roll-force of flat-rolled is 4500 tons ± 50 tons, and the first passage roll-force that rolling starts is 4600 tons ± 50 tons;
In described flying shear crop or segmentation operation, flying shear is used for shearing the head of rolled piece hypertrophy, or for sector boss rolled piece, shear rate 1.0-2.25m/s;
In described refrigerating work procedure, be that the steel plate after hot rolling is cooled to room temperature immediately;
In described thermal straightening machine aligning operation, refer to that the bent steel plate that wafts after hot rolling is aligned through straightener one or many, become straight steel plate, straightening temperature 450-1000 DEG C;
In described cold bed air cooling operation, be evenly cooled to after 140 DEG C degrees Celsius, control cold bed under motherboard;
It is characterized in that: in described refrigerating work procedure, adopt the cooling method of being combined with air cooling of laminar flow, first adopt the cooling cooldown rate with 1～2 DEG C/s of laminar flow by steel plate water-cooled to 700-720 DEG C, then air cooling is to 650-670 DEG C, adopt again the cooling cooldown rate with 4～5 DEG C/s of laminar flow by steel plate water-cooled to 500-550 DEG C, adopt again the cooling cooldown rate with 1～2 DEG C/s of laminar flow by steel plate water-cooled to 400-450 DEG C, last air cooling is to room temperature.
2. the technique of the thin specification cryogenic tank of single chassis steekle mill as claimed in claim 1 rolling case steel plate, it is characterized in that: the mechanical property of the steel plate after rolling is: yield strength: 260～330 MPa, tensile strength: 350～410MPa, percentage elongation: 32～40%.
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