CN101956130B - Large-thickness rolled steel plate instead of case one for large-sized ball mill and production method thereof - Google Patents
Large-thickness rolled steel plate instead of case one for large-sized ball mill and production method thereof Download PDFInfo
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Abstract
The invention discloses a large-thickness rolled steel plate instead of a cast one for a large-sized ball mill and a production method thereof. The steel plate is formed by smelting the following components by weight percent: 0.160-0.190% of C, less than or equal to 0.45% of Si, 1.300-1.500% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.050% of Als, 0.015-0.025% of Nb and the balance Fe and inevitable impurities. The method comprises the following steps: smelting molten steel in an electric furnace; refining in an LF refining furnace; performing vacuum treatment in a vacuum degassing furnace; and casting, electroslag remelting, heating, rolling to finished product, cooling, performing hydrogen expanding treatment and normalizing and the like to prepare into the finished product thick steel plate. The invention has the following advantages: 1) the strength and toughness are matched favorably, the yield strength Re is more than or equal to 265 MPa, Rm is 430-600 MPa, the longitudinal impact power is more than or equal to 34J at the temperature of 0 DEG C, and A is more than or equal to 17%; 2) the lamellar tearing resistance is good, and Z is more than or equal to 35%; 3) the steel of the invention is purer, P is less than or equal to 0.015%, and S is less than or equal to 0.005%: 4) the internal quality is more compact, and can satisfy the requirement of the A578C class detection standard; and 5) the maximum thickness of the steel plate can achieve 288mm.
Description
Technical field
The invention belongs to the smelting steel technical field, be specifically related to a kind of large-size ball mill with large thickness to roll for Cast Steel Plate and production method thereof.
Background technology
Large-size ball mill with large thickness to roll for Cast Steel Plate thickness at 180 ~ 288mm, be mainly used in Hydropower Unit fixed guide vane and holder mouthful lower disc member manufacturing, require that its internal soundness is high, thickness is large, but also require this type of steel plate to have preferably anti-lamellar tearing performance and wear resisting property, just can satisfy the demands.That commonly uses at present adopts Q345C/Z35 to roll for Cast Steel Plate, and this large-size ball mill is with the present domestic main dependence Foundry Production of large thickness steel plate, and is second-rate, can not satisfy the high-quality needs of large workpiece.
Summary of the invention
For the problems referred to above, the object of the invention be to provide a kind of large-size ball mill with large thickness to roll for Cast Steel Plate.
In order to realize the object of the invention, technical program of the present invention lies in providing a kind of large-size ball mill with large thickness to roll for Cast Steel Plate, this steel plate is formed by the component melting of following weight percentage: C 0.160 ~ 0.190%, Si≤0.450%, Mn 1.300 ~ 1.500%, P≤0.015%, S≤0.005%, Als 0.020 ~ 0.050%, and Nb 0.015 ~ 0.025%, and all the other are Fe and inevitable impurity.
The thickness of described steel plate is 180 ~ 288mm.
Technical program of the present invention also lies in providing a kind of produce large-size ball mill with large thickness to roll the method for Cast Steel Plate, this production method may further comprise the steps:
1) smelts: will contain the molten steel of each element first through electrosmelting, send into the refining of LF refining furnace and adjusting component, when liquid steel temperature reaches 1580 ~ 1650 ℃, change vacuum-treat in the VD stove over to, its vacuum tightness is not less than 66Pa, destroys vacuum during vacuum hold-time 〉=15min;
2) casting: the molten steel after will smelting is cast, and obtains strand;
3) esr: the good strand of will casting is made resmelting electrode, adopts electroslag furnace to carry out esr, needs before the remelting to remove oxidized iron sheets on surface of casting blank, adds the Al grain during remelting, obtains ESR ingot behind the esr;
4) ESR ingot cleaning: send steel rolling with the ESR ingot heat after the remelting, the cleaning of band temperature, the cleaning temperature is not less than 150 ℃, and in time shove charge or stacking slow cooling are processed after the cleaning;
5) heating: the ESR ingot after will clear up enters the stewing steel 60 ~ 90min of stove, adopts low speed burning steel, rate of heating: below 1000 ℃, 100 ~ 120 ℃/h of heat-up rate after temperature rises to 1230 ~ 1250 ℃ of maximum heating temperatures, is incubated 300 ~ 500min again;
6) rolling: the ESR ingot after will heating is rolled, and the fs is the austenite recrystallization stage, and rolling temperature is 950 ~ 1150 ℃, and single pass maximum reduction 40 ~ 50mm is rolling to and is thicker than final steel plate thickness 80 ~ 100mm; Subordinate phase is the non-recrystallize stage of austenite, and 820 ~ 900 ℃ of rolling temperatures are rolling to target thickness, obtain the work in-process steel plate;
7) water-cooled: the work in-process steel plate after rolling cools off fast, and red temperature is 680 ~ 720 ℃;
8) expanding hydrogen processes: the work in-process steel plate is hung in burial pit expand the hydrogen processing, the surface of steel plate temperature is not less than 400 ℃, steel plate expands 620 ~ 640 ℃ of hydrogen treatment temps in burial pit, guarantee that warming and cooling rate is not more than 50 ℃/h, the steel plate soaking time is not less than 72h, and the steel plate tapping temperature is not higher than 300 ℃;
9) normalizing: the work in-process steel plate behind the expansion hydrogen is carried out normalizing, 900 ~ 920 ℃ of normalizing temperatures, soaking time 1.8min/mm+120min, water-cooled is accelerated cooling after the normalizing.
Add Al line and CaSi piece before the described vacuum-treat of step 1).
Step 2) described casting employing continuous casting production, superheating temperature is 15 ~ 30 ℃, throwing speed is 1.0 ~ 1.25 m/min.
In the described esr of step 3), adopt five yuan of slag system (CaO-MgO-Al
2O
3-SiO
2-CaF
2) carrying out esr, average melting speed control is at 20 ~ 25kg/min, and the speed that adds the Al grain is 25 ~ 30g/min, adopts air-cooled acceleration cooling, and the crystallizer of electroslag furnace comprises 640mm, 760mm, three kinds of specifications sections of 960mm.
Step 6) described rolling in, 1000 ~ 1150 ℃ of the start rolling temperatures of fs, 950 ~ 980 ℃ of finishing temperatures, 860 ~ 900 ℃ of the start rolling temperatures of subordinate phase, 820 ~ 850 ℃ of finishing temperatures.
The draft of the rolling middle single pass of the described subordinate phase of step 6) is 8 ~ 25%.
During the described expansion hydrogen of step 8) was processed, the total time inside furnace of steel plate was not less than 150h.
The chemical composition design of steel plate of the present invention adopts the low-carbon-equivalent ferritic steel, to add the normalizing production technique by low-carbon-equivalent Composition Design and controlled rolling and controlled cooling, produce and meet the thick large-size ball mill of 180 ~ 288mm in order to roll for Cast Steel Plate, be applied to the manufacturing of large-size ball mill member, have high strength, anti-lamellar tearing performance, good welding performance, wear resisting property high, satisfy the requirements such as welding at the crucial stressed place of large-size ball mill, its manufacturing cycle is lacked, can be realized batch production.The strengthening mechanism of using is build up, refined crystalline strengthening, precipitation strength and solution strengthening.
Large-size ball mill of the present invention with large thickness to roll in the component for Cast Steel Plate: C is main to form carbide with other elements, plays build up and precipitation strength, makes the armor plate strength increase; Si as reductive agent and reductor, has certain contribution to intensity and the wear resistance of steel plate in steelmaking process; Mn mainly plays solution strengthening and reduces transformation temperature, the effect that improves armor plate strength; Al in steelmaking process as reductor, simultaneously can crystal grain thinning, improve intensity and the hardness of steel plate; Add Nb, can realize steel plate crystallization reinforcement by controlled rolling process, to reach the raising steel plate recrystallization temperature, heating solid solution Nb stops Austenite Grain Growth, and high temperature is separated out C, the N compound of Nb during cooling; Impurity element P, S equal size roll off the production line and do not limit, and reduce as far as possible under the processing unit ability, and steel is pure to reach, the even purpose of mechanical property.
Condition of delivery of the present invention is normalizing, and to roll for after the fully expansion hydrogen processing of Cast Steel Plate process and the grain refining, the obdurability index of steel plate is obviously better with large thickness for the thick large-size ball mill of 180 ~ 288mm that the employing normalizing process is produced.Owing to adopt II type controlled rolling process, be divided into two stages to be rolled respectively, solved the mill milling insufficient pressure and the coarse grains that causes is uneven, impelling strength reduces phenomenon, and increased the thickness specification that can produce steel plate.
The present invention has the following advantages: (1) obdurability coupling is good, yield strength Re 〉=265Mpa, Rm 430 ~ 600Mpa, 0 ℃ of impact of collision merit 〉=34J, A 〉=17%; (2) anti-lamellar tearing performance is good, Z 〉=35%; (3) steel of the present invention is purer, P≤0.015%, S≤0.005%; (4) internal soundness is finer and close, can satisfy the requirement of A578 C level non-destructive testing standard; (5) the steel plate maximum ga(u)ge can reach 288mm.
Test-results is indicated: the steel plate that adopts method of the present invention to produce has that purity is higher, the characteristics of homogeneous chemical composition, interior solid, the metallurgical level of steel is higher, mechanical property satisfies large-size ball mill fully to the standard-required of the thick Q345C/Z35 of 180 ~ 288mm, is suitable for making the large-size ball mill structural part.
Embodiment
Embodiment 1
The large-size ball mill of present embodiment is that component melting by following weight percent forms with large thickness to roll for Cast Steel Plate: C 0.160%, Si 0.300%, Mn 1.350%, P 0.012%, S 0.003%, Als 0.030%, Nb 0.018%, all the other are Fe and inevitable impurity.The steel plate thickness of present embodiment is 180mm.
Large-size ball mill of the present invention is as follows to roll for the production method of Cast Steel Plate with large thickness:
1) smelts: will contain the molten steel of each element first through electrosmelting, molten steel weighs 100 ~ 110 tons in the stove, then send into the refining of LF refining furnace and adjusting component, when liquid steel temperature reaches 1625 ℃, change vacuum degassing furnace (VD stove) vacuum-treat over to, add CaSi piece 100kg before the vacuum, feeding Al line 120m, vacuum tightness is not more than 66Pa, destroys vacuum during vacuum hold-time 15min;
2) casting: the molten steel after will smelting is cast, and adopts continuous casting production, and superheating temperature is 18 ℃, and throwing speed is 1.25m/min, and guarantees the secondary cooling water coupling, obtains strand;
3) esr: the good strand of will casting is made resmelting electrode in electroslag furnace according to setting size, removes oxidized iron sheets on surface of casting blank before the remelting; Adopt five yuan of slag system (CaO-MgO-Al
2O
3-SiO
2-CaF
2), adding the AL grain, adding speed is 25g/min, selects the 640mm water mold to carry out remelting, average melting speed control adopts air-cooled acceleration cooling at 22kg/min;
4) ESR ingot cleaning: send steel rolling with the ESR ingot heat after the remelting, the cleaning of band temperature, surface temperature is 445 ℃ during cleaning;
5) heating: steel 60min is boiled in a covered pot over a slow fire in the timely shove charge of the ESR ingot after will clearing up, and adopts low speed to burn steel, and heat-up rate below 1000 ℃ is controlled at 100 ℃/h, and then 1230 ℃ of maximum heating temperatures are incubated 300min;
6) rolling: the fs start rolling temperature is 1130 ℃, 960 ℃ of finishing temperatures, and fs single pass maximum reduction 40 ~ 50mm, being rolling to steel plate thickness is 280mm; 900 ℃ of the start rolling temperatures of subordinate phase, 840 ℃ of finishing temperatures, the single pass draft is 8～25%, obtains the work in-process steel plate after rolling;
7) water-cooled: the work in-process steel plate after rolling cools off fast by ACC, and red temperature is 680 ℃;
8) expanding hydrogen processes: the work in-process steel plate is hung in burial pit expand hydrogen processing, 460 ℃ of surface of steel plate temperature; Steel plate expands 630 ℃ of hydrogen treatment temps in burial pit, 45 ℃/h of warming and cooling rate, and steel plate soaking time 72h, the steel plate tapping temperature is not higher than 300 ℃, the total time inside furnace 150h of steel plate;
9) normalizing: the work in-process steel plate is carried out normalizing treatment, 900 ℃ of normalizing temperatures, every millimeter steel plate of soaking time 1.8min/mm()+and 120min, water-cooled is accelerated cooling after the normalizing.
The large-size ball mill of present embodiment is as follows in order to roll for the performance of Cast Steel Plate: Ceq is 0.38%, rolls into the 180mm steel plate, its mechanical property: yield strength 325MPa, tensile strength 540MPa, unit elongation A=21%, 0 ℃ of ballistic work AKV(is vertical) 195J, 203J, 190J, Z=50%.
Embodiment 2
The large-size ball mill of present embodiment is that component melting by following weight percent forms with large thickness to roll for Cast Steel Plate: C 0.190%, Si 0.280%, Mn 1.380%, P 0.010%, S 0.003%, Als 0.032%, Nb 0.016%, all the other are Fe and inevitable impurity.The steel plate thickness of present embodiment is 275mm.
Large-size ball mill of the present invention is as follows to roll for the production method of Cast Steel Plate with large thickness:
1) smelts: will contain the molten steel of each element first through electrosmelting, molten steel weighs 100 ~ 110 tons in the stove, then send into the refining of LF refining furnace and adjusting component, when liquid steel temperature reaches 1600 ℃, change vacuum degassing furnace (VD stove) vacuum-treat over to, add CaSi piece 120kg before the vacuum, feeding Al line 150m, vacuum tightness is not more than 66Pa, destroys vacuum during vacuum hold-time 15min;
2) casting: the molten steel after will smelting is cast, and adopts continuous casting production, and superheating temperature is 23 ℃, and throwing speed is 1.0m/min, and guarantees the secondary cooling water coupling, obtains strand;
3) esr: the good strand of will casting is made resmelting electrode in electroslag furnace according to setting size, removes oxidized iron sheets on surface of casting blank before the remelting, adopts five yuan of slag system (CaO-MgO-Al
2O
3-SiO
2-CaF
2), adding the AL grain, adding speed is 28g/min, selects the 960mm water mold to carry out remelting, average melting speed control adopts air-cooled acceleration cooling at 25kg/min;
4) ESR ingot cleaning: send steel rolling with the ESR ingot heat after the remelting, the cleaning of band temperature, surface temperature is 460 ℃ during cleaning;
5) heating: steel 90min is boiled in a covered pot over a slow fire in the timely shove charge of the ESR ingot after will clearing up, and adopts low speed to burn steel, and heat-up rate below 1000 ℃ is controlled at 120 ℃/h, and then 1240 ℃ of maximum heating temperatures are incubated 450min;
6) rolling: the fs start rolling temperature is 1100 ℃, 970 ℃ of finishing temperatures, and fs single pass maximum reduction 40 ~ 50mm, being rolling to steel plate thickness is 360mm; 890 ℃ of the start rolling temperatures of subordinate phase, 850 ℃ of finishing temperatures, the single pass draft is 8～25%, obtains the work in-process steel plate after rolling;
7) water-cooled: the work in-process steel plate after rolling cools off fast by ACC, and red temperature is 710 ℃;
8) expanding hydrogen processes: the work in-process steel plate is hung in burial pit expand hydrogen processing, 420 ℃ of surface of steel plate temperature; Steel plate expands 620 ℃ of hydrogen treatment temps in burial pit, 48 ℃/h of warming and cooling rate, and steel plate soaking time 75h, the steel plate tapping temperature is not higher than 300 ℃, the total time inside furnace 158h of steel plate;
9) normalizing: the work in-process steel plate is carried out normalizing treatment, 910 ℃ of normalizing temperatures, every millimeter steel plate of soaking time 1.8min/mm()+and 120min, water-cooled is accelerated cooling after the normalizing.
The large-size ball mill of present embodiment is as follows to roll for the performance of Cast Steel Plate with large thickness: Ceq rolls into the 275mm steel plate as 0.42%, its mechanical property: yield strength 360MPa, tensile strength 580MPa, unit elongation A=19%, 0 ℃ of ballistic work AKV(is vertical) 202J, 213J, 224J, Z=65%.
Embodiment 3
The large-size ball mill of present embodiment is that component melting by following weight percent forms with large thickness to roll for Cast Steel Plate: C 0.180%, Si 0.330%, Mn 1.360%, P 0.014%, S 0.003 %, Als 0.045%, Nb 0.020%, all the other are Fe and inevitable impurity.The steel plate thickness of present embodiment is 288mm.
Large-size ball mill of the present invention is as follows to roll for the production method of Cast Steel Plate with large thickness:
1) smelts: will contain the molten steel of each element first through electrosmelting, molten steel weighs 100 ~ 110 tons in the stove, then send into the refining of LF refining furnace and adjusting component, when liquid steel temperature reaches 1650 ℃, change vacuum degassing furnace (VD stove) vacuum-treat over to, add CaSi piece 110kg before the vacuum, feeding Al line 130m, vacuum tightness is not more than 66Pa, destroys vacuum during vacuum hold-time 15min;
2) casting: the molten steel after will smelting is cast, and adopts continuous casting production, and superheating temperature is 30 ℃, and throwing speed is 1.15m/min, and guarantees the secondary cooling water coupling, obtains strand;
3) esr: the good strand of will casting is made resmelting electrode in electroslag furnace according to setting size, removes oxidized iron sheets on surface of casting blank before the remelting, adopts five yuan of slag system (CaO-MgO-Al
2O
3-SiO
2-CaF
2), adding the AL grain, adding speed is 30g/min, selects the 760mm water mold to carry out remelting, average melting speed control adopts air-cooled acceleration cooling at 20kg/min;
4) ESR ingot cleaning: send steel rolling with the ESR ingot heat after the remelting, the cleaning of band temperature, surface temperature is 360 ℃ during cleaning;
5) heating: steel 80min is boiled in a covered pot over a slow fire in the timely shove charge of the ESR ingot after will clearing up, and adopts low speed to burn steel, and heat-up rate below 1000 ℃ is controlled at 110 ℃/h, and then 1250 ℃ of maximum heating temperatures are incubated 500min;
6) rolling: the fs start rolling temperature is 1150 ℃, 980 ℃ of finishing temperatures, and fs single pass maximum reduction 40 ~ 50mm, being rolling to steel plate thickness is 370mm; 860 ℃ of the start rolling temperatures of subordinate phase, 845 ℃ of finishing temperatures, the single pass draft is 8～25%, obtains the work in-process steel plate after rolling;
7) water-cooled: the work in-process steel plate after rolling cools off fast by ACC, and red temperature is 720 ℃;
8) expanding hydrogen processes: the work in-process steel plate is hung in burial pit expand hydrogen processing, 460 ℃ of surface of steel plate temperature; Steel plate expands 640 ℃ of hydrogen treatment temps in burial pit, 50 ℃/h of warming and cooling rate, and steel plate soaking time 78h, the steel plate tapping temperature is not higher than 300 ℃, the total time inside furnace 156h of steel plate;
9) normalizing: the work in-process steel plate is carried out normalizing treatment, 920 ℃ of normalizing temperatures, every millimeter steel plate of soaking time 1.8min/mm()+and 120min, water-cooled is accelerated cooling after the normalizing.
The large-size ball mill of present embodiment is as follows to roll for the performance of Cast Steel Plate with large thickness: Ceq rolls into the 288mm steel plate as 0.41%.Its mechanical property: yield strength 355MPa, tensile strength 540MPa, unit elongation A=20%, 0 ℃ of ballistic work AKV(is vertical) 193J, 208J, 174J, Z=58%.
Embodiment 4
The large-size ball mill of present embodiment is that component melting by following weight percent forms with large thickness to roll for Cast Steel Plate: C 0.17%, Si 0.39%, Mn 1.31%, P 0.010%, S 0.003 %, Als 0.039%, Nb 0.017%, all the other are Fe and inevitable impurity.The steel plate thickness of present embodiment is 200mm.
Large-size ball mill of the present invention is as follows to roll for the production method of Cast Steel Plate with large thickness:
1) smelts: will contain the molten steel of each element first through electrosmelting, molten steel weighs 100 ~ 110 tons in the stove, then send into the refining of LF refining furnace and adjusting component, when liquid steel temperature reaches 1580 ℃, change vacuum degassing furnace (VD stove) vacuum-treat over to, add CaSi piece 100kg before the vacuum, feeding Al line 150m, vacuum tightness is not more than 66Pa, destroys vacuum during vacuum hold-time 15min;
2) casting: the molten steel after will smelting is cast, and adopts continuous casting production, and superheating temperature is 15 ℃, and throwing speed is 1.10m/min, and guarantees the secondary cooling water coupling, obtains strand;
3) esr: remove the continuously cast bloom scale on surface, the strand that casting is good according to schedule size is made electroslag furnace remelting raw material, adopts electroslag furnace to carry out esr, adopts five yuan of slag system (CaO-MgO-Al
2O
3-SiO
2-CaF
2), adding the AL grain, adding speed is 26g/min, selects the 760mm water mold to carry out remelting, average melting speed control adopts air-cooled acceleration cooling at 23kg/min;
4) ESR ingot cleaning: send steel rolling with the ESR ingot heat after the remelting, the cleaning of band temperature, surface temperature is 440 ℃ during cleaning;
5) heating: steel 65min is boiled in a covered pot over a slow fire in the timely shove charge of the ESR ingot after will clearing up, and adopts low speed to burn steel, and heat-up rate below 1000 ℃ is controlled at 110 ℃/h, and then 1240 ℃ of maximum heating temperatures are incubated 400min;
6) rolling: the fs start rolling temperature is 1000 ℃, 950 ℃ of finishing temperatures, and fs single pass maximum reduction 40 ~ 50mm, being rolling to steel plate thickness is 280mm; 880 ℃ of the start rolling temperatures of subordinate phase, 820 ℃ of finishing temperatures, the single pass draft is 8～25%, obtains the work in-process steel plate after rolling;
7) water-cooled: the work in-process steel plate after rolling cools off fast by ACC, and red temperature is 690 ℃;
8) expanding hydrogen processes: the work in-process steel plate is hung in burial pit expand hydrogen processing, 460 ℃ of surface of steel plate temperature; Steel plate expands 620 ℃ of hydrogen treatment temps in burial pit, 46 ℃/h of warming and cooling rate, and steel plate soaking time 76h, the steel plate tapping temperature is not higher than 300 ℃, the total time inside furnace 152h of steel plate;
9) normalizing: the work in-process steel plate is carried out normalizing treatment, 900 ℃ of normalizing temperatures, every millimeter steel plate of soaking time 1.8min/mm()+and 120min, water-cooled is accelerated cooling after the normalizing.
The large-size ball mill of present embodiment is as follows to roll for the performance of Cast Steel Plate with large thickness: Ceq rolls into the 200mm steel plate as 0.39%, its mechanical property: yield strength 330MPa, tensile strength 520MPa, unit elongation A=23%, 0 ℃ of ballistic work AKV(is vertical) 207J, 223J, 231J, Z=45%.
Steel plate in above-described embodiment 1～4 is carried out weldability test, weld under the normal welding heat input normal temperature, heat affected zone and close position, heat affected zone hardness are lower than the 220HV(Vickers' hardness); These steel are when the wlding coupling of selecting, and welding steel does not all need preheating under the normal temperature, does not produce welding crack, and does not need to heat-treat after the welding.
Claims (8)
1. to roll the production method for Cast Steel Plate, it is characterized in that: the thickness of described steel plate is 180 ~ 288mm, and this production method may further comprise the steps with large thickness for a large-size ball mill:
1) smelt: according to C 0.160 ~ 0.190%, Si≤0.450%, Mn 1.300 ~ 1.500%, P≤0.015%, S≤0.005%, Als 0.020 ~ 0.050%, Nb 0.015 ~ 0.025%, all the other are the prescription of Fe and inevitable impurity, will contain the molten steel of each element first through electrosmelting, send into the refining of LF refining furnace and adjusting component, when liquid steel temperature reaches 1580 ~ 1650 ℃, change vacuum-treat in the VD stove over to, its vacuum tightness is not less than 66Pa, destroys vacuum during vacuum hold-time 〉=15min;
2) casting: the molten steel after will smelting is cast, and obtains strand;
3) esr: the good strand of will casting is made resmelting electrode, adopts electroslag furnace to carry out esr, needs before the remelting to remove oxidized iron sheets on surface of casting blank, adds the Al grain during remelting, obtains ESR ingot behind the esr;
4) ESR ingot cleaning: send steel rolling with the ESR ingot heat after the remelting, the cleaning of band temperature, the cleaning temperature is not less than 150 ℃, and in time shove charge or stacking slow cooling are processed after the cleaning;
5) heating: the ESR ingot after will clear up enters the stewing steel 60 ~ 90min of stove, adopts low speed burning steel, rate of heating: below 1000 ℃, 100 ~ 120 ℃/h of heat-up rate after temperature rises to 1230 ~ 1250 ℃ of maximum heating temperatures, is incubated 300 ~ 500min again;
6) rolling: the ESR ingot after will heating is rolled, and the fs is the austenite recrystallization stage, and rolling temperature is 950 ~ 1150 ℃, and single pass maximum reduction 40 ~ 50mm is rolling to and is thicker than final steel plate thickness 80 ~ 100mm; Subordinate phase is the non-recrystallize stage of austenite, and 820 ~ 900 ℃ of rolling temperatures are rolling to target thickness, obtain the work in-process steel plate;
7) water-cooled: the work in-process steel plate after rolling cools off fast, and red temperature is 680 ~ 720 ℃;
8) expanding hydrogen processes: the work in-process steel plate is hung in burial pit expand the hydrogen processing, the surface of steel plate temperature is not less than 400 ℃, steel plate expands 620 ~ 640 ℃ of hydrogen treatment temps in burial pit, guarantee that warming and cooling rate is not more than 50 ℃/h, the steel plate soaking time is not less than 72h, and the steel plate tapping temperature is not higher than 300 ℃;
9) normalizing: the work in-process steel plate behind the expansion hydrogen is carried out normalizing, 900 ~ 920 ℃ of normalizing temperatures, soaking time 1.8min/mm+120min, water-cooled is accelerated cooling after the normalizing.
2. large-size ball mill according to claim 1, is characterized in that: step 1 to roll the production method for Cast Steel Plate with large thickness) add Al line and CaSi piece before the described vacuum-treat.
3. large-size ball mill according to claim 1, is characterized in that: step 2 to roll the production method for Cast Steel Plate with large thickness) production of described casting employing continuous casting, superheating temperature is 15 ~ 30 ℃, throwing speed is 1.0 ~ 1.25 m/min.
4. large-size ball mill according to claim 1, is characterized in that to roll the production method for Cast Steel Plate with large thickness: in the described esr of step 3), adopt five yuan of slag system CaO-MgO-Al
2O
3-SiO
2-CaF
2Carry out esr, average melting speed control is at 20 ~ 25kg/min, and the speed that adds the Al grain is 25 ~ 30g/min, adopts air-cooled acceleration cooling, and the crystallizer of electroslag furnace comprises 640mm, 760mm, three kinds of specifications sections of 960mm.
Large-size ball mill according to claim 1 with large thickness to roll the production method for Cast Steel Plate, it is characterized in that: step 6) described rolling in, 1000 ~ 1150 ℃ of the start rolling temperatures of fs, 950 ~ 980 ℃ of finishing temperatures, 860 ~ 900 ℃ of the start rolling temperatures of subordinate phase, 820 ~ 850 ℃ of finishing temperatures.
6. large-size ball mill according to claim 1, is characterized in that to roll the production method for Cast Steel Plate with large thickness: the draft of the rolling middle single pass of the described subordinate phase of step 6) is 8 ~ 25%.
7. large-size ball mill according to claim 1, is characterized in that to roll the production method for Cast Steel Plate with large thickness: during the described expansion hydrogen of step 8) was processed, the total time inside furnace of steel plate was not less than 150h.
A large-size ball mill that adopts the preparation of production method as claimed in claim 1 with large thickness to roll for Cast Steel Plate.
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| CN102796952A (en) * | 2011-05-24 | 2012-11-28 | 舞阳钢铁有限责任公司 | High-thickness steel plate for ocean platform and production method for steel plate |
| US8562713B2 (en) * | 2011-05-27 | 2013-10-22 | A. Finkl & Sons Co. | Flexible minimum energy utilization electric arc furnace system and processes for making steel products |
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| CN101713054A (en) * | 2009-12-28 | 2010-05-26 | 舞阳钢铁有限责任公司 | Large thickness steel plate for hydrogenation reaction chamber reeling equipment and production method thereof |
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