CN102776441A - Steel plate for third-generation nuclear power station reactor containments and manufacturing method thereof - Google Patents
Steel plate for third-generation nuclear power station reactor containments and manufacturing method thereof Download PDFInfo
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Abstract
The invention belongs to the field of steel plate smelting, and specifically relates to a steel plate for third-generation nuclear power station reactor containments and a manufacturing method for the steel plate. The steel plate for the third-generation nuclear power station reactor containments contains the following components by weight: 0.08-0.12% of carbon (C), 0.15-0.55% of silicon (Si), 0.9-1.5% of manganese (Mn), less than or equal to 0.007% of phosphorus (P), less than or equal to 0.004% of sulphur (S), 0.1-0.5% of nickel (Ni), 0.0-0.3% of chromium (Cr), 0.10-0.35% of molybdenum (Mo), 0.010-0.050% of vanadium (V), 0.010-0.030% of niobium (Nb), 0.008-0.035% of titanium (Ti), 0.020-0.050% of aluminum (Al), less than or equal to 0.006% of nitrogen (N), and less than or equal to 0.08% of Nb+V; and the balance of iron and unavoidable impurities. The steel plate has benefits that the steel plate, containing combinations of components by weight percentage mentioned above and being manufactured by the method provided by the invention, is characterized by low carbon content, high-temperature resistant performance against 200 degrees centigrade, low cost and excellent welding performance; and tensile strength of the steel plate is higher than 600MPa.
Description
Technical field
The invention belongs to the steel plate field of smelting, what be specifically related to is that a kind of third generation nuclear power plant reactor reactor housing is used steel plate, also relates to the method for manufacture of this steel plate.
Background technology
By in May, 2012, there are 8 unit operations, 12 units building at home, nuclear power continues to increase with the steel demand, and particularly the nuclear reactor safety shell is big with the steel demand.
The nuclear power reactor housing is that nuclear is used steel for 2 grades with steel, and service condition is harsh complicated, and excellent comprehensive performances must be arranged, and indexs such as the ability of the high-strong toughness under purity of steel, internal soundness, low temperature and the high temperature, non-deformability are had strict requirement.Nuclear power requires low phosphorus content, all kinds of non-metallic inclusion rank of control to be not more than 1.5 grades and rational chemical design and strict thermal treatment process with reactor housing steel plate SA738Gr.B production process; Conventional at present smelting technology can't satisfy the requirement of ultralow phosphorus; Need exploitation ultra-low phosphoretic steel smelting technology; And smelting process needs strict control to inclusion, chemical ingredients; Steel plate need carry out different thermal treatment process experiments after rolling seeking the optimum treatment process parameter, so production process has higher difficulty.
Generally adopt converter duplex method dephosphorization technology during the domestic production ultra-low phosphoretic steel, this arts demand has the converter cooperation of 2 same capabilities to carry out, and dephosphorization in first converter carries out operations such as decarburization, temperature adjustment in second converter.Though the duplex dephosphorization effect is good, facility investment is big, and operational path is complicated, can't realize on the existing installation of most steel mills at home.Double slag process is smelted the extra investment that dephosphorization technology need not to carry out equipment, and this technology of exploitation has better economic property and feasibility under the existing installation condition.
The SA738Gr.B steel plate adopt the rational chemical design and quenching+tempered thermal treatment process of being complementary be to guarantee that steel plate has the prerequisite that rational microtexture and each item mechanical property satisfy standard.Rational heat treatment technology can guarantee that steel plate has uniform microtexture, thereby guarantees that steel plate has indexs such as good normal temperature tensile property, high temperature tensile properties, low-temperature flexibility, guarantees the security that steel plate is using.
Nuclear power need possess higher security with steel, has both better economic property practicality simultaneously.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of third generation nuclear power plant reactor reactor housing and use steel plate, the carbon content of this steel plate is low, and its tensile strength reaches more than the 600MPa, and anti-200 ℃ of high-temperature behaviors are with low cost, welding property is good;
The present invention also provides the method for manufacture of above third generation nuclear power plant reactor reactor housing with steel plate, and this method has replaced the method for Traditional use dephosphorization stove dephosphorization in the production process, provides cost savings, and has reached identical dephosphorization effect; Quenching+thermal treatment in addition reaches more than the 600MPa tensile strength of steel, anti-200 ℃ of high-temperature behaviors.
A kind of third generation nuclear power plant reactor reactor housing is used steel plate, comprises following by weight percentage: carbon (C) 0.08～0.12%, silicon (Si) 0.15～0.55%; Manganese (Mn) 0.9～1.5%, phosphorus (P)≤0.007%, sulphur (S)≤0.004%, nickel (Ni) 0.1～0.5%; Chromium (Cr) 0.0～0.3%, molybdenum (Mo) 0.10～0.35%, vanadium (V) 0.010～0.050%; Niobium (Nb) 0.010～0.030%, titanium (Ti) 0.008～0.035%, aluminium (Al) 0.020～0.050%; Nitrogen (N)≤0.006%, Nb+V≤0.08%, surplus is iron and unavoidable impurities.
Preferably, third generation nuclear power plant reactor reactor housing is used steel plate, comprises following by weight percentage: carbon (C) 0.09～0.11%, silicon (Si) 0.15～0.40%; Manganese (Mn) 1.1～1.4%, phosphorus (P)≤0.007%, sulphur (S)≤0.004%, nickel (Ni) 0.3～0.5%; Chromium (Cr) 0.0～0.2%, molybdenum (Mo) 0.2～0.3%, vanadium (V) 0.030～0.050%; Niobium (Nb) 0.015～0.030%, titanium (Ti) 0.015～0.030%, aluminium (Al) 0.030～0.045%; Nitrogen (N)≤0.006%, Nb+V≤0.08%, surplus is iron and unavoidable impurities.
Preferred, third generation nuclear power plant reactor reactor housing is used steel plate, comprises following by weight percentage: carbon (C) 0.10%, silicon (Si) 0.23%; Manganese (Mn) 1.26%, phosphorus (P) 0.006%, sulphur (S) 0.003%, nickel (Ni) 0.38%, chromium (Cr) 0.10%; Molybdenum (Mo) 0.25%, vanadium (V) 0.038%, niobium (Nb) 0.018%, titanium (Ti) 0.016%; Aluminium (Al) 0.037%, nitrogen (N) 0.004%, Nb+V0.06%, surplus is iron and unavoidable impurities.
A kind of third generation nuclear power plant reactor reactor housing comprises following step with the method for manufacture of steel plate: molten iron pretreatment desulfurizing, dephosphorization, LF+RH refining, sheet billet continuous casting, slab stacking slow cooling and reheat, dephosphorize by high pressure water, steel plate stacking slow cooling; It is characterized in that, in the described dephosphorization step, be dephosphorization phase oxygen blast 6～7min tap to tap time between slag forming period for the first time, and converter dephosphorization phase oxygen supply intensity is 23000～26000m
3/ h, the rifle position is 1800～2000mm, the adding mode of ore: 2/3rds of ore adds when dephosphorization, and back 1/3rd adds behind dephosphorization, guarantees that process temperature is not higher than 1630 ℃, bottom blowing strength maintenance 55m3/h; When carbon 0.20%, re-blow once, the endpoint carbon content target is≤0.03%, P≤0.006%, and the tapping temperature target is 1600-1630 ℃; Adopt floating plug, the two pushing off the slag tappings of scum rod; Electrolytic nickel and molybdenum-iron add converter with steel scrap, and tapping process adds aluminium ferromanganese, lime 1000kg and 200～300kg fluorite and makes the top slag; Add manganese metal, aluminium ferromanganese, ferrosilicon, ferro-niobium and ferrochrome successively, vanadium iron carries out alloying, tapping process argon blowing time 10-15 minute is carried out dark desulfurization at the LF refining furnace, and each alloying element is finely tuned to target and added ferrotianium.
Third generation nuclear power plant reactor reactor housing is with the method for manufacture of steel plate, and this method also comprises the quenching+tempering heat treatment after the steel plate stacking slow cooling, and its concrete steps are: 800～1000 ℃ of steel plate quenching temperature; Time inside furnace 1～3min/mm; Soaking time 10～20min, 500～700 ℃ of steel plate tempering temperatures, time inside furnace 0.8～1.6min/mm; Air cooling after tempering insulation time 10～20min, steel plate come out of the stove.
Preferably, third generation nuclear power plant reactor reactor housing comprises following step with the method for manufacture of steel plate:
A. hot metal pretreatment: make wherein that sulphur takes off to 0.002-0.005%, through the dark desulfurization pre-treatment of KR and bright of the back molten iron of skimming greater than 90%, 1250～1350 ℃ of molten iron temperatures, arsenic in the molten iron (As)≤0.006%;
B. dephosphorization: converter smelting adopts the double slag process dephosphorizing method, is dephosphorization phase oxygen blast 6～7min tap to tap time between slag forming period for the first time, and converter dephosphorization phase oxygen supply intensity is 23000～26000m
3/ h, the rifle position is 1800～2000mm, the adding mode of ore: 2/3rds of ore adds when dephosphorization, and back 1/3rd adds behind dephosphorization, guarantees that process temperature is not higher than 1630 ℃, bottom blowing strength maintenance 55m
3/ h; When carbon 0.20%, re-blow once, the endpoint carbon content target is≤0.03%, P≤0.006%, and the tapping temperature target is 1600-1630 ℃; Adopt floating plug, the two pushing off the slag tappings of scum rod; Electrolytic nickel and molybdenum-iron add converter with steel scrap, and tapping process adds aluminium ferromanganese, lime 1000kg and 200～300kg fluorite and makes the top slag; Add manganese metal, aluminium ferromanganese, ferrosilicon, ferro-niobium and ferrochrome successively, vanadium iron carries out alloying, tapping process argon blowing time 10-15 minute is carried out dark desulfurization at the LF refining furnace, and each alloying element is finely tuned to target and added ferrotianium.
The c.LF refining: adopt the white slag mode of making in early days, vanadium iron adds in the LF operation, out-station temperature 1650-1665 ℃; RH vacuum-treat vacuum tightness is not more than 1.5mbar, empty 15～20 minutes time of fidelity; Feed the calcium iron wire behind the RH, sulphur sex change in the steel, argon blowing time is not less than 15 minutes after the line feeding;
D. sheet billet continuous casting: continuous casting pulling rate 0.8-1.0m/min, full argon shield casting, process nitrogen pick-up is not more than 0.0015%;
E. slab stacking slow cooling and reheat: the continuously cast bloom stacking slow cooling more than 48 hours, is heated afterwards, and heat-up time, heating back tapping temperature was controlled at 1120-1170 ℃ according to 8-10min/mm;
F. dephosphorize by high pressure water: continuously cast bloom heats the dephosphorization of laggard horizontal high voltage water, and 1050～1090 ℃ of start rolling temperatures, hot stage add heavy reduction and improve the distortion rate of permeation, reduce last pass, and the finish rolling stage stops in the perfect recrystallization district, and finishing temperature is more than 900 ℃;
H. steel plate rolls the back and adopts stacking slow cooling technology, guarantees the homogenizing with microtexture of separating out of hydrogen in the steel;
I. the steel plate quenching temperature is 800～1000 ℃, time inside furnace 1～3min/mm, soaking time 10～20min, 500～700 ℃ of steel plate tempering temperatures, air cooling after time inside furnace 0.8～1.6min/mm, tempering insulation time 10～20min, steel plate come out of the stove.
Preferably, in the step I, the quenching temperature of steel plate is 850～950 ℃, time inside furnace 1.5～2.5min/mm, soaking time 12～18min, 550～650 ℃ of steel plate tempering temperatures, time inside furnace 1.2～1.5min/mm, tempering insulation time 12～18min.
Preferred, in the step I, the quenching temperature of steel plate is 915 ℃, time inside furnace 2min/mm, soaking time 16min, 630 ℃ of steel plate tempering temperatures, time inside furnace 1.2min/mm, tempering insulation time 14min.
The thickness of above steel plate is greater than 40mm.
Beneficial effect of the present invention is: adopt the double slag process dephosphorization technology can under the existing installation condition, realize the smelting of ultra-low phosphoretic steel, have good and economic and feasibility; The strict control of smelting process non-metallic inclusion has been realized the production of Clean Steel; Adopt method element combinations and that the present invention adopted of the used parts by weight proportioning of the present invention to make steel plate, its carbon content is low, and its tensile strength reaches more than the 600MPa, and anti-200 ℃ of high-temperature behaviors are with low cost, welding property is good.
Description of drawings
Fig. 1 embodiment 1 steel plate metallographic structure photo (thickness 1/4 place, 500 times);
Fig. 2 embodiment 2 steel plate metallographic structure photos (thickness 1/4 place, 500 times);
Fig. 3 instance 1 steel plate autstenitic grain size photo (100 times, grain fineness number is 8.5 grades, touchstone is ASTM E112-96);
Fig. 4 instance 2 steel plate autstenitic grain size photos (100 times, grain fineness number is 8.5 grades, touchstone is ASTM E112-96).
Embodiment
Come the present invention is done explanation further below in conjunction with accompanying drawing and embodiment,, but do not limit the present invention with this so that those skilled in the art more understands the present invention.
Embodiment 1
Adopt the KR molten iron pretreatment desulfurizing, handle back sulphur content 0.002%, 1269 ℃ of molten iron temperatures, arsenic content 0.003%;
Converter: adopt the double slag process smelting technology, 24000 cubic metres/hour of dephosphorization phase oxygen flows, rifle position average out to 1900mm.The dephosphorization phase finished when blowing reached 5 minutes and 55 seconds, deslagging, and the scoriform attitude is better during deslagging, and the deslagging amount is big.Converter terminal phosphorus content 0.0052%, 1615 ℃ of terminal temperatures;
Tapping: two pushing off the slag technologies are taked in tapping, and pushing off the slag is good, and the following quantity of slag is little, and tapping adds top slag 800kg, fluorite 260kg, ferromanganese 1358kg, AlMnTi221kg.CAS feeds aluminum steel 220m, and phosphorus content is 0.0056% behind the CAS;
LF: 1527 ℃ of the temperature of arriving at a station, 1651 ℃ of out-station temperatures.Heat-up time, 30min handled cycle 59min.Add vanadium iron adjustment v element content;
RH: the empty time 15min of fidelity, vacuum tightness 0.6mbr.Soft blow argon 20min behind hello the calcium iron wire behind the RH, soft blow Molten Steel face does not have exposed;
Continuous casting: pulling rate is 0.8m/min, full argon shield casting;
The chemical ingredients that heat analysis obtains steel plate is: C:0.09%, Si:0.23%, Mn:1.26%, P:0.0065%; S:0.0030%, Cr:0.14%, Nb:0.018%, Ni:0.38%; V:0.038%, N:0.0040%, Ti:0.016%; Mo:0.17%, Alt:0.040%, Nb+V:0.056%;
Slab rolled off the production line cooling more than 69 hours;
Continuously cast bloom is heating: 258 minutes heat-up times, 1125～1146 ℃ of tapping temperatures.
Start rolling temperature: 1058 ℃,
Finishing temperature: 909 ℃,
The steel plate hardening and tempering process: 912 ℃ of Heating temperatures, soaking time is water-cooled after 17 minutes; 628 ℃ of tempering temperatures, soaking time 17 minutes,
The thickness of producing steel plate is 42.5mm, and the normal temperature tensile property is as shown in table 1.
Table 1 steel plate normal temperature tensile property
| Lot number | RP0.2, MPa | Tensile strength, MPa | Unit elongation A50, % | Relative reduction in area, % |
| 11TR030368-1 | 540 | 635 | 27 | 63.6 |
| 11TR030368-2 | 540 | 635 | 28 | 64.1 |
| 11TR030369-1 | 550 | 640 | 29 | 64.8 |
| 11TR030369-2 | 570 | 655 | 27 | 63.6 |
| 11TR026025-1 | 560 | 645 | 28 | 63.8 |
| 11TR026025-2 | 560 | 650 | 26 | 62.9 |
| 11TR026026-1 | 530 | 635 | 26 | 62.9 |
| 11TR026026-2 | 570 | 650 | 25 | 62.3 |
| 11TR026029-1 | 545 | 630 | 24 | 62.2 |
| 11TR026029-2 | 550 | 620 | 26 | 62.7 |
High temperature tension test: diameter 6mm pole tension specimen is heated to 200 ℃ of insulation 20min, and tensile property is as shown in table 2.
Table 2 steel plate high temperature tensile properties
| Lot number | RP0.2,MPa | Tensile strength, MPa | Unit elongation A, % |
| 11TR026025-1 | 540 | 620 | 17 |
| 11TR026025-2 | 550 | 645 | 18 |
| 11TR026026-1 | 520 | 595 | 18 |
| 11TR026026-2 | 540 | 615 | 18 |
| 11TR026029-1 | 510 | 600 | 19 |
| 11TR026029-2 | 510 | 610 | 20 |
| 11TR030368-1 | 510 | 620 | 20 |
| 11TR-030368-2 | 510 | 605 | 22 |
| 11TR-030369-1 | 540 | 625 | 20 |
| 11TR-030369-2 | 510 | 595 | 21.5 |
Low temperature impact test: carry out low temperature impact test at-45 ℃, shock test adopts v-notch, and Impulse Test Result is as shown in table 3.
Table 3 steel plate-45 ℃ V-type Impulse Test Result
According to ASTM E45-2002 standard, analyzed the inclusion rank of steel plate, the result is as shown in table 4.
Table 4 inclusion rating result
Embodiment 2
Adopt the KR molten iron pretreatment desulfurizing, handle back sulphur content 0.002%, 1279 ℃ of molten iron temperatures, arsenic content 0.003%;
Converter: adopt the double slag process smelting technology, 26000 cubic metres/hour of dephosphorization phase oxygen flows, rifle position average out to 2000mm.The dephosphorization phase finished when blowing reached 5 minutes and 55 seconds, deslagging, and the scoriform attitude is general during deslagging, and slag is thicker.Converter terminal phosphorus content 0.0058%;
Tapping: two pushing off the slag technologies are taked in tapping, and pushing off the slag is good, and the following quantity of slag is little.Tapping adds top slag 800kg, fluorite 260kg, ferromanganese 1750kg, ferro-niobium 30kg, ferrochrome 300kg, ferrosilicon 430kg, AlMnTi280kg.CAS feeds aluminum steel 300m;
LF: 1553 ℃ of the temperature of arriving at a station, 1658 ℃ of out-station temperatures.Heat-up time, 27min handled cycle 44min.Add vanadium iron adjustment v element content;
RH: empty 16 minutes and 45 seconds time of fidelity, vacuum tightness 0.6mbr.Fed behind the calcium iron wire soft blow argon behind the RH 17 minutes, soft blow Molten Steel face does not have exposed;
Continuous casting: pulling rate is 0.9m/min, full argon shield casting;
The chemical ingredients that heat analysis obtains steel plate is: C:0.08%, Si:0.25%, Mn:1.33%, P:0.0062%, S:0.0033%; Cr:0.17%, Nb:0.019%, Ni:0.36%, V:0.043%; Ti:0.015%, Mo:0.13%, Alt:0.036%, Nb+V:0.062%.
Slab rolled off the production line cooling more than 69 hours;
Continuously cast bloom is heating: 261 minutes heat-up times, 1130～1140 ℃ of tapping temperatures;
Start rolling temperature: 1054～1067 ℃;
Finishing temperature: 905～916 ℃;
Roll back steel plate stacking slow cooling more than 24 hours.
Steel plate hardening and tempering process: Heating temperature 907-915 ℃, soaking time is water-cooled after 19 minutes; Tempering temperature 627-634 ℃, soaking time 17 minutes.
The thickness of producing steel plate is 45mm, and the normal temperature tensile property is as shown in table 5.
Table 5 steel plate normal temperature tensile property
Diameter 6mm pole sample is heated to 200 ℃, is incubated and carries out high temperature tension test after 16～21 minutes, test-results is as shown in table 6.
Table 6 steel plate high temperature tensile properties
Low temperature impact test: carry out low temperature impact test at-45 ℃, shock test adopts v-notch, and Impulse Test Result is as shown in table 7.
Table 7 steel plate-45 ℃ V-type Impulse Test Result
Embodiment 3
A. hot metal pretreatment: make wherein that sulphur takes off to 0.003%, through the dark desulfurization pre-treatment of KR and bright of the back molten iron of skimming greater than 90%, 1300 ℃ of molten iron temperatures, arsenic in the molten iron (As)≤0.006%;
B. dephosphorization: converter smelting adopts the double slag process dephosphorizing method, is dephosphorization phase oxygen blast 7min tap to tap time between slag forming period for the first time, adopts nominal capacity 120t converter, and dephosphorization phase oxygen supply intensity is 26000m
3/ h, the rifle position is 2000mm, the adding mode of ore: 2/3rds of ore adds at dephosphorization, and back 1/3rd adds behind dephosphorization, guarantees that process temperature is not too high, bottom blowing strength maintenance 55m
3/ h; When carbon 0.20%, re-blow once, the endpoint carbon content target is≤0.03%, P≤0.006%, and the tapping temperature target is 1630 ℃; Adopt floating plug, the two pushing off the slag tappings of scum rod; Tapping process adds aluminium ferromanganese, lime 1000kg and 300kg fluorite and makes the top slag; Use manganese metal, ferrosilicon to carry out alloying by limit in Si, the Mn composition; Deoxidation alloying, argon blowing time 15 minutes;
The c.LF refining: adopt the white slag mode of making in early days, vanadium iron adds in the LF operation, 1665 ℃ of out-station temperatures; RH vacuum-treat vacuum tightness is not more than 1.5mbar, the empty 20 minutes time of fidelity; Feed the calcium iron wire behind the RH, sulphur sex change in the steel, argon blowing time is not less than 15 minutes after the line feeding;
D. sheet billet continuous casting: continuous casting pulling rate 1.0m/min, full argon shield casting, process nitrogen pick-up is not more than 0.0015%;
E. slab stacking slow cooling and reheat: the continuously cast bloom stacking slow cooling more than 48 hours, is heated afterwards, and heat-up time, heating back tapping temperature was controlled at 1170 ℃ according to 10min/mm;
F. dephosphorize by high pressure water: continuously cast bloom heats the dephosphorization of laggard horizontal high voltage water, and 1090 ℃ of start rolling temperatures, hot stage add heavy reduction and improve the distortion rate of permeation, reduce last pass, and the finish rolling stage stops in the perfect recrystallization district, and finishing temperature is more than 900 ℃;
H. steel plate rolls the back and adopts stacking slow cooling technology, guarantees the homogenizing with microtexture of separating out of hydrogen in the steel;
I. the steel plate quenching temperature is 1000 ℃, time inside furnace 3min/mm, soaking time 20min, 700 ℃ of steel plate tempering temperatures, air cooling after time inside furnace 1.6min/mm, tempering insulation time 20min, steel plate come out of the stove.
Embodiment 4
A. hot metal pretreatment: make wherein that sulphur takes off to 0.002%, through the dark desulfurization pre-treatment of KR and bright of the back molten iron of skimming greater than 90%, 1250 ℃ of molten iron temperatures, arsenic in the molten iron (As)≤0.006%;
B. dephosphorization: converter smelting adopts the double slag process dephosphorizing method, is dephosphorization phase oxygen blast 6min tap to tap time between slag forming period for the first time, adopts nominal capacity 120t converter, and dephosphorization phase oxygen supply intensity is 23000m
3/ h, the rifle position is 1800mm, the adding mode of ore: 2/3rds of ore adds when dephosphorization, and back 1/3rd adds behind dephosphorization, guarantees that process temperature is not too high, bottom blowing strength maintenance 55m3/h; When carbon 0.20%, re-blow once, the endpoint carbon content target is≤0.03%, P≤0.006%, and the tapping temperature target is 1600 ℃; Adopt floating plug, the two pushing off the slag tappings of scum rod; Tapping process adds aluminium ferromanganese, lime 1000kg and 200kg fluorite and makes the top slag; Use manganese metal, ferrosilicon to carry out alloying by limit in Si, the Mn composition; Deoxidation alloying, argon blowing time 10-15 minute;
The c.LF refining: adopt the white slag mode of making in early days, vanadium iron adds in the LF operation, 1650 ℃ of out-station temperatures; RH vacuum-treat vacuum tightness is not more than 1.5mbar, the empty 15 minutes time of fidelity; Feed the calcium iron wire behind the RH, sulphur sex change in the steel, argon blowing time is not less than 15 minutes after the line feeding;
D. sheet billet continuous casting: continuous casting pulling rate 0.8m/min, full argon shield casting, process nitrogen pick-up is not more than 0.0015%;
E. slab stacking slow cooling and reheat: the continuously cast bloom stacking slow cooling more than 48 hours, is heated afterwards, and heat-up time, heating back tapping temperature was controlled at 1120 ℃ according to 8min/mm;
F. dephosphorize by high pressure water: continuously cast bloom heats the dephosphorization of laggard horizontal high voltage water, and 1050 ℃ of start rolling temperatures, hot stage add heavy reduction and improve the distortion rate of permeation, reduce last pass, and the finish rolling stage stops in the perfect recrystallization district, and finishing temperature is more than 900 ℃;
H. steel plate rolls the back and adopts stacking slow cooling technology, guarantees the homogenizing with microtexture of separating out of hydrogen in the steel;
I. the steel plate quenching temperature is 800 ℃, time inside furnace 1min/mm, soaking time 10min, 500 ℃ of steel plate tempering temperatures, air cooling after time inside furnace 0.8min/mm, tempering insulation time 10min, steel plate come out of the stove.
Embodiment 5
A. hot metal pretreatment: make wherein that sulphur takes off to 0.003%, through the dark desulfurization pre-treatment of KR and bright of the back molten iron of skimming greater than 90%, 1300 ℃ of molten iron temperatures, arsenic in the molten iron (As)≤0.006%;
B. dephosphorization: converter smelting adopts the double slag process dephosphorizing method, is dephosphorization phase oxygen blast 6～7min tap to tap time between slag forming period for the first time, adopts nominal capacity 120t converter, and dephosphorization phase oxygen supply intensity is 23000～26000m
3/ h, the rifle position is 1800～2000mm, the adding mode of ore: 2/3rds of ore adds when dephosphorization, and back 1/3rd adds behind dephosphorization, guarantees that process temperature is not too high, bottom blowing strength maintenance 55m
3/ h; When carbon 0.20%, re-blow once, the endpoint carbon content target is≤0.03%, P≤0.006%, and the tapping temperature target is 1600-1630 ℃; Adopt floating plug, the two pushing off the slag tappings of scum rod; Tapping process adds aluminium ferromanganese, lime 1000kg and 200～300kg fluorite and makes the top slag; Use manganese metal, ferrosilicon to carry out alloying by limit in Si, the Mn composition; Deoxidation alloying, argon blowing time 10-15 minute;
The c.LF refining: adopt the white slag mode of making in early days, vanadium iron adds in the LF operation, out-station temperature 1650-1665 ℃; RH vacuum-treat vacuum tightness is not more than 1.5mbar, empty 15～20 minutes time of fidelity; Feed the calcium iron wire behind the RH, sulphur sex change in the steel, argon blowing time is not less than 15 minutes after the line feeding;
D. sheet billet continuous casting: continuous casting pulling rate 0.8-1.0m/min, full argon shield casting, process nitrogen pick-up is not more than 0.0015%;
E. slab stacking slow cooling and reheat: the continuously cast bloom stacking slow cooling more than 48 hours, is heated afterwards, and heat-up time, heating back tapping temperature was controlled at 1120-1170 ℃ according to 8-10min/mm;
F. dephosphorize by high pressure water: continuously cast bloom heats the dephosphorization of laggard horizontal high voltage water, and 1050～1090 ℃ of start rolling temperatures, hot stage add heavy reduction and improve the distortion rate of permeation, reduce last pass, and the finish rolling stage stops in the perfect recrystallization district, and finishing temperature is more than 900 ℃;
H. steel plate rolls the back and adopts stacking slow cooling technology, guarantees the homogenizing with microtexture of separating out of hydrogen in the steel;
I. the quenching temperature of steel plate is 915 ℃, time inside furnace 2min/mm, soaking time 16min, 630 ℃ of steel plate tempering temperatures, air cooling after time inside furnace 1.2min/mm, tempering insulation time 14min, steel plate come out of the stove.
Comparative Examples 1
The quenching temperature of steel plate is 950 ℃, and all the other conditions and embodiment 5 are identical;
Comparative Examples 2
The quenching temperature of steel plate is 1050 ℃, and all the other conditions and embodiment 5 are identical;
Comparative Examples 3
Steel plate quenching time inside furnace 0.5min/mm, all the other times are identical with embodiment 5;
Comparative Examples 4
Steel plate quenching soaking time 4min/mm, all the other times are identical with embodiment 5;
Comparative Examples 5
850 ℃ of steel plate quenching temperature, time inside furnace 1min/mm, soaking time 10min, 550 ℃ of steel plate tempering temperatures, air cooling after time inside furnace 0.7min/mm, tempering insulation time 8min, steel plate come out of the stove.
Comparative Examples 6
1050 ℃ of steel plate quenching temperature, time inside furnace 4min/mm, soaking time 25min, 750 ℃ of steel plate tempering temperatures, air cooling after time inside furnace 1.8min/mm, tempering insulation time 25min, steel plate come out of the stove.
It below is the comparison of steel plate each item performance of embodiment 5 and Comparative Examples 1-6
Its performance of table 8 steel plate relatively
| ? | RP0.2, MPa | Tensile strength, MPa | Unit elongation A50, % | Relative reduction in area, % |
| Embodiment 5 | 550 | 640 | 29 | 64.8 |
| Comparative Examples 1 | 535 | 610 | 25 | 35.2 |
| Comparative Examples 2 | 510 | 625 | 20 | 45.5 |
| Comparative Examples 3 | 625 | 755 | 15 | 35.1 |
| Comparative Examples 4 | 580 | 645 | 23 | 54.4 |
| Comparative Examples 5 | 620 | 705 | 19 | 32.6 |
| Comparative Examples 6 | 435 | 550 | 30 | 66.3 |
Table 9 steel plate high temperature tensile properties is (200 ℃) relatively
| ? | RP0.2,MPa | Tensile strength, MPa | Unit elongation A, % |
| Embodiment 5 | 515 | 605 | 23 |
| Comparative Examples 1 | 480 | 555 | 18 |
| Comparative Examples 2 | 445 | 540 | 24 |
| Comparative Examples 3 | 600 | 695 | 15 |
| Comparative Examples 4 | 525 | 600 | 16 |
| Comparative Examples 5 | 580 | 685 | 15 |
| Comparative Examples 6 | 395 | 465 | 26 |
Table 10 steel plate-45 ℃ V-type Impulse Test Result
| ? | Average ballistic work |
| Embodiment 5 | 293 |
| Comparative Examples 1 | 195 |
| Comparative Examples 2 | 209 |
| Comparative Examples 3 | 185 |
| Comparative Examples 4 | 165 |
| Comparative Examples 5 | 163 |
| Comparative Examples 6 | 322 |
Learn that from the contrast of the experimental result of above each Comparative Examples and instance 5 quenching temperature, quench heat-up time and tempering temperature all have remarkable influence to the stretching and the impelling strength of steel plate.Along with the normal temperature of the decline steel plate of quenching temperature stretch on a declining curve with the intensity of drawing by high temperature, and ballistic work increase; Tempering insulation time is long more, and the low more and unit elongation of tensile strength increases.With Comparative Examples 1-Comparative Examples 6 relatively, adopt the SA738Gr.B steel plate of the processing parameter production of instance 5 to have suitable intensity index and high toughness, intensity is reasonable with the toughness coupling, and production process has higher economical efficiency, is the reasonable technology method.
Claims (9)
1. a third generation nuclear power plant reactor reactor housing is used steel plate, comprises following by weight percentage: carbon (C) 0.08～0.12%, silicon (Si) 0.15～0.55%; Manganese (Mn) 0.9～1.5%, phosphorus (P)≤0.007%, sulphur (S)≤0.004%, nickel (Ni) 0.1～0.5%; Chromium (Cr) 0.0～0.3%, molybdenum (Mo) 0.10～0.35%, vanadium (V) 0.010～0.050%; Niobium (Nb) 0.010～0.030%, titanium (Ti) 0.008～0.035%, aluminium (Al) 0.020～0.050%; Nitrogen (N)≤0.006%, Nb+V≤0.08%, surplus is iron and unavoidable impurities.
2. a kind of third generation nuclear power plant reactor reactor housing as claimed in claim 1 is used steel plate, comprises following by weight percentage: carbon (C) 0.09～0.11%, silicon (Si) 0.15～0.40%; Manganese (Mn) 1.1～1.4%, phosphorus (P)≤0.007%, sulphur (S)≤0.004%, nickel (Ni) 0.3～0.5%; Chromium (Cr) 0.0～0.2%, molybdenum (Mo) 0.2～0.3%, vanadium (V) 0.030～0.050%; Niobium (Nb) 0.015～0.030%, titanium (Ti) 0.015～0.030%, aluminium (Al) 0.030～0.045%; Nitrogen (N)≤0.006%, Nb+V≤0.08%, surplus is iron and unavoidable impurities.
3. use steel plate like described a kind of third generation nuclear power plant reactor reactor housing of claim 1 or 2, comprise following by weight percentage: carbon (C) 0.10%, silicon (Si) 0.23%; Manganese (Mn) 1.26%, phosphorus (P) 0.006%, sulphur (S) 0.003%, nickel (Ni) 0.38%; Chromium (Cr) 0.10%, molybdenum (Mo) 0.25%, vanadium (V) 0.038%; Niobium (Nb) 0.018%, titanium (Ti) 0.016%, aluminium (Al) 0.037%; Nitrogen (N) 0.004%, Nb+V0.06%, surplus is iron and unavoidable impurities.
4. a kind of third generation nuclear power plant reactor reactor housing according to claim 1 comprises following step: molten iron pretreatment desulfurizing, dephosphorization, LF+RH refining, sheet billet continuous casting, slab stacking slow cooling and reheat, dephosphorize by high pressure water, steel plate stacking slow cooling with the method for manufacture of steel plate; It is characterized in that, in the described dephosphorization step, be dephosphorization phase oxygen blast 6～7min tap to tap time between slag forming period for the first time, and converter dephosphorization phase oxygen supply intensity is 23000～26000m
3/ h, the rifle position is 1800～2000mm, the adding mode of ore: 2/3rds of ore adds when dephosphorization, and back 1/3rd adds behind dephosphorization, guarantees that process temperature is not higher than 1630 ℃, bottom blowing strength maintenance 55m
3/ h; When carbon 0.20%, re-blow once, the endpoint carbon content target is≤0.03%, P≤0.006%, and the tapping temperature target is 1600-1630 ℃; Adopt floating plug, the two pushing off the slag tappings of scum rod; Electrolytic nickel and molybdenum-iron add converter with steel scrap, and tapping process adds aluminium ferromanganese, lime 1000kg and 200～300kg fluorite and makes the top slag; Add manganese metal, aluminium ferromanganese, ferrosilicon, ferro-niobium and ferrochrome successively, vanadium iron carries out alloying, tapping process argon blowing time 10-15 minute is carried out dark desulfurization at the LF refining furnace, and each alloying element is finely tuned to target and added ferrotianium.
5. a kind of third generation nuclear power plant reactor reactor housing as claimed in claim 4 is characterized in that with the method for manufacture of steel plate this method also comprises the quenching+tempering heat treatment after the steel plate stacking slow cooling; The concrete steps of described quenching+tempering heat treatment are: 800～1000 ℃ of steel plate quenching temperature, time inside furnace 1～3min/mm, soaking time 10～20min; 500～700 ℃ of steel plate tempering temperatures; Air cooling after time inside furnace 0.8～1.6min/mm, tempering insulation time 10～20min, steel plate come out of the stove.
6. a kind of third generation nuclear power plant reactor reactor housing as claimed in claim 5 comprises following step with the method for manufacture of steel plate:
A. hot metal pretreatment: make wherein that sulphur takes off to 0.002-0.005%, through the dark desulfurization pre-treatment of KR and bright of the back molten iron of skimming greater than 90%, 1250～1350 ℃ of molten iron temperatures, arsenic in the molten iron (As)≤0.006%;
B. dephosphorization: converter smelting adopts the double slag process dephosphorizing method, is dephosphorization phase oxygen blast 6～7min tap to tap time between slag forming period for the first time, and converter dephosphorization phase oxygen supply intensity is 23000～26000m
3/ h, the rifle position is 1800～2000mm, the adding mode of ore: 2/3rds of ore adds when dephosphorization, and back 1/3rd adds behind dephosphorization, guarantees that process temperature is not higher than 1630 ℃, bottom blowing strength maintenance 55m3/h; When carbon 0.20%, re-blow once, the endpoint carbon content target is≤0.03%, P≤0.006%, and the tapping temperature target is 1600-1630 ℃; Adopt floating plug, the two pushing off the slag tappings of scum rod; Electrolytic nickel and molybdenum-iron add converter with steel scrap, and tapping process adds aluminium ferromanganese, lime 1000kg and 200～300kg fluorite and makes the top slag; Add manganese metal, aluminium ferromanganese, ferrosilicon, ferro-niobium and ferrochrome successively, vanadium iron carries out alloying, tapping process argon blowing time 10-15 minute is carried out dark desulfurization at the LF refining furnace, and each alloying element is finely tuned to target and added ferrotianium;
The c.LF refining: adopt the white slag mode of making in early days, vanadium iron adds in the LF operation, out-station temperature 1650-1665 ℃; RH vacuum-treat vacuum tightness is not more than 1.5mbar, empty 15～20 minutes time of fidelity; Feed the calcium iron wire behind the RH, sulphur sex change in the steel, argon blowing time is not less than 15 minutes after the line feeding;
D. sheet billet continuous casting: continuous casting pulling rate 0.8-1.0m/min, full argon shield casting, process nitrogen pick-up is not more than 0.0015%;
E. slab stacking slow cooling and reheat: the continuously cast bloom stacking slow cooling more than 48 hours, is heated afterwards, and heat-up time, heating back tapping temperature was controlled at 1120-1170 ℃ according to 8-10min/mm;
F. dephosphorize by high pressure water: continuously cast bloom heats the dephosphorization of laggard horizontal high voltage water, and 1050～1090 ℃ of start rolling temperatures, hot stage add heavy reduction and improve the distortion rate of permeation, reduce last pass, and the finish rolling stage stops in the perfect recrystallization district, and finishing temperature is more than 900 ℃;
H. steel plate rolls the back and adopts stacking slow cooling technology, guarantees the homogenizing with microtexture of separating out of hydrogen in the steel;
I. the steel plate quenching temperature is 800～1000 ℃, time inside furnace 1～3min/mm, soaking time 10～20min, 500～700 ℃ of steel plate tempering temperatures, air cooling after time inside furnace 0.8～1.6min/mm, tempering insulation time 10～20min, steel plate come out of the stove.
7. a kind of third generation nuclear power plant reactor reactor housing as claimed in claim 6 is characterized in that, in the described step I with the method for manufacture of steel plate; The quenching temperature of steel plate is 850～950 ℃; Time inside furnace 1.5～2.5min/mm, soaking time 12～18min, 550～650 ℃ of steel plate tempering temperatures; Time inside furnace 1.2～1.5min/mm, tempering insulation time 12～18min.
8. a kind of third generation nuclear power plant reactor reactor housing as claimed in claim 7 is characterized in that, in the described step I with the method for manufacture of steel plate; The quenching temperature of steel plate is 915 ℃; Time inside furnace 2min/mm, soaking time 16min, 630 ℃ of steel plate tempering temperatures; Time inside furnace 1.2min/mm, tempering insulation time 14min.
9. use steel plate according to each described a kind of nuclear-power reactor reactor housing in the claim 6 to 8, it is characterized in that the thickness of this steel plate is greater than 40mm.
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