CN103710620B - A kind of heavy thickness steel plate for low temperature pressure container and production technique thereof - Google Patents
A kind of heavy thickness steel plate for low temperature pressure container and production technique thereof Download PDFInfo
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- CN103710620B CN103710620B CN201310730029.0A CN201310730029A CN103710620B CN 103710620 B CN103710620 B CN 103710620B CN 201310730029 A CN201310730029 A CN 201310730029A CN 103710620 B CN103710620 B CN 103710620B
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Abstract
The invention discloses a kind of heavy thickness steel plate for low temperature pressure container and production technique thereof, this heavy thickness steel plate for low temperature pressure container comprises the chemical composition of following mass percent: C:0.14 ~ 0.18, Si:0.30 ~ 0.45, Mn:1.20 ~ 1.50, P≤0.015, S≤0.005, Als:0.015 ~ 0.030, Nb:0.025 ~ 0.035, Ti:0.010 ~ 0.020, Ni:0.40-0.60, other is Fe and relict element; Its technical process is: high-quality molten iron, KR hot metal pretreatment, 100/120 ton of top and bottom combined blown converter, the refining of LF stove, Fruit storage, strand cooling in heap 24 hours, heating, 3800m milling train, ACC section cooling, 11 roller thermal straightening machines, cooling in heap, finishing, outer inspection, flaw detection, warehouse-in.Beneficial effect of the present invention is: 1. steel is purer; 2. low-temperature impact work is high, and-45 DEG C, thickness of slab 1/2 place horizontal V-shape ballistic work is at more than 84J; 3. thickness Tensile fracture shrinking percentage is high at more than 60J for-60 DEG C of horizontal V-shape ballistic works, is relative reduction in area at 35%-50%? between; 4. steel plate maximum ga(u)ge can reach 100mm.
Description
Technical field
The present invention relates to steel, be specifically related to a kind of heavy thickness steel plate for low temperature pressure container and production technique thereof.
Background technology
Along with the deep development of the industry such as petrochemical complex, Coal Chemical Industry, need for the manufacture of the various condensing tower larger-scale unit in the equipment such as Coal Chemical Industry, petrochemical complex, the demand of market to think gauge steel for low-temperature pressure container is increasing.Due to its Special use environment, low-temperature impact-resistant toughness and the anti-lamellar tearing performance of steel for low-temperature pressure container have strict requirement.
Summary of the invention
For the problems referred to above, the present inventor, through groping, provides a kind of heavy thickness steel plate for low temperature pressure container, to improve the low-temperature impact toughness of steel plate and anti-lamellar tearing performance.
For the problems referred to above, the present invention also aims to the production method providing a kind of heavy thickness steel plate for low temperature pressure container, steel plate maximum ga(u)ge can reach 100mm.
For achieving the above object, the technical scheme that the present invention takes: this heavy thickness steel plate for low temperature pressure container comprises the chemical composition (unit of following mass percent, wt%): C:0.14 ~ 0.18, Si:0.30 ~ 0.45, Mn:1.20 ~ 1.50, P≤0.015, S≤0.005, Als:0.015 ~ 0.030, Nb:0.025 ~ 0.035, Ti:0.010 ~ 0.020, Ni:0.40-0.60, other is Fe and relict element.
In smelting process, strict control P(phosphorus in steel), S(sulphur) etc. harmful element, ensure that the purity of molten steel reaches Clean Steel level substantially.In follow-up rolling heat-processed, for preventing steel billet (steel ingot) internal grain thick, suitably reducing Heating temperature, avoiding inside steel billet original austenite grains too to grow up.In the operation of rolling, by adopting TMCP rolling technique and steel plate stacking slow cooling technology, under low-carbon-equivalent condition, guaranteeing that mechanical property of steel plate is good, make steel plate have good tissue, over-all properties and welding property, can also reduce the cost, enhance one's market competitiveness; The production method of steel plate of the present invention adopts the thermal treatment process of normalizing, obtains perlite and ferritic structure.
Carbon equivalent [Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15] :≤0.37.
In aforesaid method, the steel plate maximum ga(u)ge produced is 100mm specification.
The present invention adopts converter smelting, continuous casting (or water-cooled die casting) to pour into a mould, the method of 3800mm wide and heavy plate mill rolling produces low-temperature pressure vessel steel, and its technical process is: high-quality molten iron, KR hot metal pretreatment, 100/120 ton of top and bottom combined blown converter, the refining of LF stove, Fruit storage, strand cooling in heap 24 hours (steel ingot cooling in heap 36-60 hours), heating, 3800mm milling train, ACC section cooling, 11 roller thermal straightening machines, cooling in heap, finishing, outer inspection, flaw detection, warehouse-in.
KR hot metal pretreatment technology: the molten iron that arrives at a station must be taken off front slag and take off rear slag, ensure liquid level thickness of slag layer≤20mm, molten iron ensures molten iron S≤0.003% after KR stirring desulphurization, ensure desulfurization cycle≤21min, desulfurization temperature drop≤20 DEG C.
Converter smelting process: enter stove molten iron S≤0.010%, P≤0.080%, molten iron temperature >=1270 DEG C, molten iron Intake Quantity error controls by ± 1t, steel scrap strictly adopts high-quality scrap stock, process rifle position by early stage 1.0-1.3m, mid-term 1.2-1.6m, later stage 1.0-1.1m controls, slag making basicity R presses 2.5-4.0 and controls, and tapping target P≤0.015%, C >=0.05%, S≤0.003%, to Si-Al-Ba-Ca, manganeseirom, ferro-silicon and lime, fluorite in ladle in tapping process.With slag tapping before floating plug gear before tapping, adopt slag stop cone pushing off the slag before tapping terminates, ensure thickness of slag layer≤30mm, in converter tapping process, require omnidistance Argon.
Argon blowing process: argon station is disposable adds aluminum steel, requires strong Argon 3min at argon station, flow 200-500NL/min, molten steel face bore hole diameter control, must not lower than 1570 DEG C from argon station temperature at 300 ~ 500mm.
LF refinery practice: omnidistance Argon in refining process, Argon intensity needs to regulate according to different link.Add refining slag, basicity is pressed 4.0-6.0 and is controlled, and refinement and deoxidation agent is based on calcium carbide, aluminum shot, ferrosilicon powder, and add-on is according to steel oxygen content in water and make white slag situation and add in right amount.Heat-processed selects suitable electric current to heat according to rhythm is more than needed with temperature conditions, heat-up time, one heating 7-12min, two heating 6-10min, required in two heat-processedes according to slag making situation by twice control, add reductor, and require that dry slag number of times is greater than 6 times.Add silicon-calcium wire before leaving from station, before adding silicon-calcium wire, must argon gas be closed, upper steel temperature 1565 ± 15 DEG C of (not adopting vacuum outgas)/1610 ± 15 DEG C (employing vacuum outgas).
VD refinery practice: VD vacuum tightness must reach below 67Pa, the dwell time is necessary >=15min, and soft blow 2-5min or do not blow after vacuum breaker, in soft blow process, molten steel must not be exposed.Normally wrap the pumpdown time online: (vacuumizing front liquid steel temperature-target temperature leaving from station)/1.7min.Insulating covering agent, ensures to be paved with molten steel face, must close argon gas, upper steel temperature 1565 ± 15 DEG C before adding insulating covering agent.
Casting process: by the continuous casting of molten steel after smelting or die casting, obtain continuously cast bloom or steel ingot, meet compression ratio when being greater than 4, select continuously cast bloom (the thick continuous casting of 350mm-400mm) or steel ingot to feed intake according to different steel plate thickness;
Heating process: Heating temperature and heat-up time as follows: stewing steel temperature 620-650 DEG C, time 2h, heat-up rate 100 DEG C/S, 6h is incubated when temperature rises to 810 DEG C, heat-up rate 100 DEG C/S, when temperature rises to 1000 DEG C, heat-up rate is not limit, and insulation 15h when temperature rises to 1280 DEG C, temperature is tapped 1260 DEG C time.
Controlled rolling and controlled cooling
In conjunction with steel-making chemical composition, for preventing mixed crystal and coarse grains, the rolling requirements of strict adherence " high temperature, low speed, greatly pressure ", accumulative draft >=60%, start rolling temperature 1020 DEG C ~ 1080 DEG C, the steel thickness that dries in the air is greater than 200mm, for the finish rolling stage add up deflection and crystal grain thinning, dislocations strengthening lays the foundation.Two-stage start rolling temperature≤840 DEG C, guarantee that distortion infiltration makes austenite internal grain be crushed elongations, increase crystal boundary useful area and the effective a large amount of deformation bands of formation, for austenite phase transformation provides more forming core point, reach the object of fining austenite grains, finishing temperature 800 ~ 820 DEG C;
Easily make grain growth owing to rolling rear slow cooling, and the alloy solid solution amount such as C, Mn in tissue is limited, therefore will control suitable speed of cooling.In order to obtain excellent comprehensive mechanical property, according to the difference of thickness of slab, roll the section cooling that rear employing is different, by adjustment cooling manifold group number, red temperature between 660 ~ 680 DEG C, speed of cooling 5 ~ 8 DEG C/S, cool at twice, all with weak cold, be then sent to straightener aligning.
Cooling in heap technique: adopt high temperature cooling in heap technique can effectively avoid, because of the unrelieved stress of cooling generation fast, greatly can reducing the content of hydrogen in steel plate simultaneously, fully realizing thermal diffusion effect, improve steel plate inspection defect.Steel plate stacking retarded cooling process is as follows; Stacking slow cooling temperature is not less than 450 DEG C, heap cool time >=48 hour;
Thermal treatment process: machine stove carries out normalizing treatment outside, temperature is 900 ± 10 DEG C, soaking time 2min/mm, air cooling after coming out of the stove.
Beneficial effect of the present invention is: 1. steel of the present invention is purer, P≤0.010%, S≤0.005%; 2. low-temperature impact work is high, and-45 DEG C, thickness of slab 1/2 place horizontal V-shape ballistic work is at more than 84J; 3. thickness (Z-direction) Tensile fracture shrinking percentage is high at more than 60J for-60 DEG C of horizontal V-shape ballistic works, and relative reduction in area is between 35%-50%; 4. steel plate maximum ga(u)ge can reach 100mm.
Embodiment
The present invention adopts converter smelting, continuous casting (or water-cooled die casting) to pour into a mould, the method of 3800mm wide and heavy plate mill rolling produces low-temperature pressure vessel steel, and its technical process is: high-quality molten iron, KR hot metal pretreatment, 100/120 ton of top and bottom combined blown converter, the refining of LF stove, Fruit storage, strand cooling in heap 24 hours (steel ingot cooling in heap 36-60 hours), heating, 3800mm milling train, ACC section cooling, 11 roller thermal straightening machines, cooling in heap, finishing, outer inspection, flaw detection, warehouse-in.
Embodiment is as follows:
Composition Design: smelted by Clean Steel, strictly control P, S content, both ensured low-carbon-equivalent and the weldability of steel plate by carrying out strict TMCP rolling, ensure again steel plate obdurability coupling, tear resistance.Concrete Composition Design is: C:0.14 ~ 0.18, Si:0.30 ~ 0.45, Mn:1.20 ~ 1.50, P≤0.015, S≤0.005, Als:0.015 ~ 0.030, Nb:0.025 ~ 0.035, Ti:0.010 ~ 0.020, Ni:0.40-0.60, other is Fe and relict element.
KR hot metal pretreatment technology: the molten iron that arrives at a station must be taken off front slag and take off rear slag, ensure liquid level thickness of slag layer≤20mm, molten iron ensures molten iron S≤0.003% after KR stirring desulphurization, ensure desulfurization cycle≤21min, desulfurization temperature drop≤20 DEG C.
Converter smelting process: enter stove molten iron S≤0.010%, P≤0.080%, molten iron temperature >=1270 DEG C, molten iron Intake Quantity error controls by ± 1t, steel scrap strictly adopts high-quality scrap stock, process rifle position by early stage 1.0-1.3m, mid-term 1.2-1.6m, later stage 1.0-1.1m controls, slag making basicity R presses 2.5-4.0 and controls, and tapping target P≤0.015%, C >=0.05%, S≤0.003%, to Si-Al-Ba-Ca, manganeseirom, ferro-silicon and lime, fluorite in ladle in tapping process.With slag tapping before floating plug gear before tapping, adopt slag stop cone pushing off the slag before tapping terminates, ensure thickness of slag layer≤30mm, in converter tapping process, require omnidistance Argon.
Argon blowing process: argon station is disposable adds aluminum steel, requires strong Argon 3min at argon station, flow 200-500NL/min, molten steel face bore hole diameter control, must not lower than 1570 DEG C from argon station temperature at 300 ~ 500mm.
LF refinery practice: omnidistance Argon in refining process, Argon intensity needs to regulate according to different link.Add refining slag, basicity is pressed 4.0-6.0 and is controlled, and refinement and deoxidation agent is based on calcium carbide, aluminum shot, ferrosilicon powder, and add-on is according to steel oxygen content in water and make white slag situation and add in right amount.Heat-processed selects suitable electric current to heat according to rhythm is more than needed with temperature conditions, heat-up time, one heating 7-12min, two heating 6-10min, required in two heat-processedes according to slag making situation by twice control, add reductor, and require that dry slag number of times is greater than 6 times.Add silicon-calcium wire before leaving from station, before adding silicon-calcium wire, must argon gas be closed, upper steel temperature 1565 ± 15 DEG C of (not adopting vacuum outgas)/1610 ± 15 DEG C (employing vacuum outgas).
VD refinery practice: VD vacuum tightness must reach below 67Pa, the dwell time is necessary >=15min, and soft blow 2-5min or do not blow after vacuum breaker, in soft blow process, molten steel must not be exposed.Normally wrap the pumpdown time online: (vacuumizing front liquid steel temperature-target temperature leaving from station)/1.7min.Insulating covering agent, ensures to be paved with molten steel face, must close argon gas, upper steel temperature 1565 ± 15 DEG C before adding insulating covering agent.
Casting process: by the continuous casting of molten steel after smelting or die casting, obtain continuously cast bloom or steel ingot, meet compression ratio when being greater than 4, select continuously cast bloom (the thick continuous casting of 350mm-400mm) or steel ingot to feed intake according to different steel plate thickness;
Heating process: Heating temperature and heat-up time as follows: stewing steel temperature 620-650 DEG C, time 2h, heat-up rate 100 DEG C/S, 6h is incubated when temperature rises to 810 DEG C, heat-up rate 100 DEG C/S, when temperature rises to 1000 DEG C, heat-up rate is not limit, and insulation 15h when temperature rises to 1280 DEG C, temperature is tapped 1260 DEG C time.
Controlled rolling and controlled cooling
In conjunction with steel-making chemical composition, for preventing mixed crystal and coarse grains, the rolling requirements of strict adherence " high temperature, low speed, greatly pressure ", accumulative draft >=60%, start rolling temperature 1020 DEG C ~ 1080 DEG C, the steel thickness that dries in the air is greater than 200mm, for the finish rolling stage add up deflection and crystal grain thinning, dislocations strengthening lays the foundation.Two-stage start rolling temperature≤840 DEG C, guarantee that distortion infiltration makes austenite internal grain be crushed elongations, increase crystal boundary useful area and the effective a large amount of deformation bands of formation, for austenite phase transformation provides more forming core point, reach the object of fining austenite grains, finishing temperature 800 ~ 820 DEG C;
Easily make grain growth owing to rolling rear slow cooling, and the alloy solid solution amount such as C, Mn in tissue is limited, therefore will control suitable speed of cooling.In order to obtain excellent comprehensive mechanical property, according to the difference of thickness of slab, roll the section cooling that rear employing is different, by adjustment cooling manifold group number, red temperature between 660 ~ 680 DEG C, speed of cooling 5 ~ 8 DEG C/S, cool at twice, all with weak cold, be then sent to straightener aligning.
Cooling in heap technique: adopt high temperature cooling in heap technique can effectively avoid, because of the unrelieved stress of cooling generation fast, greatly can reducing the content of hydrogen in steel plate simultaneously, fully realizing thermal diffusion effect, improve steel plate inspection defect.Steel plate stacking retarded cooling process is as follows; Stacking slow cooling temperature is not less than 450 DEG C, heap cool time >=48 hour;
Thermal treatment process: machine stove carries out normalizing treatment outside, temperature is 900 ± 10 DEG C, soaking time 2min/mm, air cooling after coming out of the stove.
Interpretation of result
Mechanical mechanics property is analyzed
Composition and mechanical mechanics property are pressed GB3531-2008 and are performed, and mechanical property specifically sees the following form:
Steel plate mechanical property manufactured experimently by table 1
This produces each 4 crowdes of 60mm, 80mm as a trial, 100mm Plate Steel 2 batches, and its mechanical property situation is specifically in table 1, and trial-production plate property reaches the level of 15MnNiDR in standard GB35312008 completely, excellent performance.
Outer inspection and flaw detection
The steel plate developed is examined outward, and the percentage of A-class goods 100%, detects a flaw by JB/T4730, and closing secondary rate is 100%, reach desired result.
Claims (1)
1. the production technique of a heavy thickness steel plate for low temperature pressure container, this heavy thickness steel plate for low temperature pressure container comprises the chemical composition of following mass percent: C:0.14 ~ 0.18, Si:0.30 ~ 0.45, Mn:1.20 ~ 1.50, P≤0.015, S≤0.005, Als:0.015 ~ 0.030, Nb:0.025 ~ 0.035, Ti:0.010 ~ 0.020, Ni:0.40-0.60, other is Fe and relict element; The production technique of above-mentioned heavy thickness steel plate for low temperature pressure container is: high-quality molten iron, KR hot metal pretreatment, 100/120 ton of top and bottom combined blown converter, the refining of LF stove, Fruit storage, strand cooling in heap 24 hours, heating, 3800mm milling train, ACC section cooling, 11 roller thermal straightening machines, cooling in heap, finishing, outer inspection, flaw detection, warehouse-in; In KR hot metal pretreatment technology, the molten iron that arrives at a station must be taken off front slag and take off rear slag, and ensure liquid level thickness of slag layer≤20mm, molten iron ensures molten iron S≤0.003% after KR stirring desulphurization, ensure desulfurization cycle≤21min, desulfurization temperature drop≤20 DEG C; Converter smelting process: enter stove molten iron S≤0.010%, P≤0.080%, molten iron temperature >=1270 DEG C, molten iron Intake Quantity error controls by ± 1t, steel scrap strictly adopts high-quality scrap stock, process rifle position by early stage 1.0-1.3m, mid-term 1.2-1.6m, later stage 1.0-1.1m controls, slag making basicity R presses 2.5-4.0 and controls, and tapping target P≤0.015%, C >=0.05%, S≤0.003%, add Si-Al-Ba-Ca, manganeseirom, ferro-silicon and lime, fluorite in tapping process in ladle; With slag tapping before floating plug gear before tapping, adopt slag stop cone pushing off the slag before tapping terminates, ensure thickness of slag layer≤30mm, in converter tapping process, require omnidistance Argon; Argon blowing process: argon station is disposable adds aluminum steel, requires strong Argon 3min at argon station, flow 200-500NL/min, molten steel face bore hole diameter control, must not lower than 1570 DEG C from argon station temperature at 300 ~ 500mm; Heating process: Heating temperature and heat-up time as follows: stewing steel temperature 620-650 DEG C, time 2h, heat-up rate 100 DEG C/S, 6h is incubated when temperature rises to 810 DEG C, heat-up rate 100 DEG C/S, when temperature rises to 1000 DEG C, heat-up rate is not limit, insulation 15h when temperature rises to 1280 DEG C, and temperature is tapped 1260 DEG C time; Steel plate stacking retarded cooling process is as follows; Stacking slow cooling temperature is not less than 450 DEG C, heap cool time >=48 hour; Thermal treatment process: machine stove carries out normalizing treatment outside, temperature is 900 ± 10 DEG C, soaking time 2min/mm, air cooling after coming out of the stove.
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| CN104561784A (en) * | 2014-12-31 | 2015-04-29 | 南阳汉冶特钢有限公司 | Steel BB503 steel plate for blast furnace housing as well as production method of steel BB503 steel plate |
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| CN107034414A (en) * | 2016-12-24 | 2017-08-11 | 首钢总公司 | Yield strength 415MPa grade high-strength normalizing container steels and heat treatment method |
| CN107254633A (en) * | 2017-05-31 | 2017-10-17 | 舞阳钢铁有限责任公司 | Low-temperature pressure container 15MnNiNbDR steel plates and production method |
| CN108004465A (en) * | 2017-11-23 | 2018-05-08 | 南阳汉冶特钢有限公司 | A kind of 130mm thickness low-temperature pressure container 16MnDR steel plates and its production method |
| CN113549815B (en) * | 2021-06-25 | 2022-09-16 | 鞍钢股份有限公司 | Low-alloy steel plate for pressure vessel for low temperature and production method thereof |
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