CN104525919B - A kind of manufacture method of supercritical turbine Blade Steel electroslag remelting steel ingot - Google Patents
A kind of manufacture method of supercritical turbine Blade Steel electroslag remelting steel ingot Download PDFInfo
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- CN104525919B CN104525919B CN201410741764.6A CN201410741764A CN104525919B CN 104525919 B CN104525919 B CN 104525919B CN 201410741764 A CN201410741764 A CN 201410741764A CN 104525919 B CN104525919 B CN 104525919B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/06—Melting-down metal, e.g. metal particles, in the mould
- B22D23/10—Electroslag casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
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Abstract
The present invention discloses a kind of manufacture method of supercritical turbine Blade Steel electroslag remelting steel ingot, specifically adopts the smelting process of the two support arm electroslag furnace remeltings of electric arc furnaces+LF+VOD/VHD+; Strict consutrode Si, Al, the B composition controlled; Strict Al powder or the Fe-Si powder mixture amount of adding of controlling in electroslag slag process, and in consutrode esr process, in slag bath, strictly control and add Al powder, Fe-Si powder amount to reduce element amount of oxidation loss in esr process uniformly, ensure chemical composition, gas oxygen content, the degree of purity uniformity of ESR ingot entirety; The present invention is adapted at common electroslag furnace and smelts, and reduces equipment investment, reduces smelting cost; The low Si, low Al supercritical turbine Blade Steel gas oxygen content≤30 × 10 that adopt this explained hereafter to obtain6, non-metallic inclusion meets ASTM? E45 standard A method evaluation regulation, thus make it meet the requirement of supercritical turbine Blade Steel clarity.
Description
Technical field
The invention belongs to metal material refining techniques field, relate to the manufacture method of a kind of high-purity low Si, low Al steel ingot, toolBody relates to a kind of manufacture method of supercritical turbine Blade Steel electroslag remelting steel ingot.
Background technology
Silicone content≤0.10% in stainless steel, aluminium content≤0.015% is called the low al stainless steel of low silicon, current ultra supercriticalThe chemical Composition Control of generating set blade material requires to need to adopt the low al stainless steel of this type of low silicon. Along with turbine making technologyDevelopment, single-machine capacity is increasing, steam turbine is to the development of overcritical, ultra supercritical unit, its vapor (steam) temperature and operating pressureBring up to 600 DEG C, 24MPa～28MPa by original 538 DEG C, 17MPa respectively, only have the turbine blade steel of high cleanlinessCan ensure that turbine blade has satisfactory mechanical property and high temperature endurance performance. Adopt electroslag remelting process to manufacture electroslag weightMolten steel ingot have advantages of chemical composition evenly, dense materials, high purity, therefore, the low silicon of domestic production at present, low aluminium are notRust steel also adopts electroslag remelting process conventionally. Because the content of silicon and aluminium is very low, in esr process in steel melting loss of elements amount large,Gas oxygen content increases, thereby causes oxide inclusion to increase, the oxygen content that more there will be ESR ingot heelpiece end and filling end withDegree of purity is big-difference very, is difficult to ensure the uniformity of ESR ingot overall chemical composition, oxygen content, degree of purity. In order to solve thisOne difficult problem, domestic a lot of producers adopt at common crystallizer for electroslag furnace and argon gas or nitrogen device are installed or are adopted protective atmosphere electricityThe equipment such as slag hearth, vacuum electric slag hearth are smelted this kind low low al stainless steel of silicon, still do not realize ESR ingot overall chemical composition,Oxygen content, degree of purity uniformity; External permanent molten fast electroslag furnace under protective Ar gas stove, the vacuum electric slag hearth equipment of adopting is smelted this kind lowThe low al stainless steel of silicon, can realize ESR ingot overall chemical composition, oxygen content, degree of purity uniformity, but smelting equipment investmentVery large.
Summary of the invention
The present invention discloses a kind of manufacture method of supercritical turbine Blade Steel electroslag remelting steel ingot, drops into low costReach ESR ingot entirety and there is chemical composition, oxygen content, degree of purity uniformity object.
The present invention utilizes common double support arm electroslag furnace, the process program of employing new technology to realize above-mentioned purpose.
One, novel technique scheme concrete technology step is as follows:
The first step, adopts electric arc furnaces+LF+VOD/VHD stove mode to smelt the consumable utmost point (1):
1. electric arc furnaces: furnace charge is returned etc. and to be formed by steel scrap, the pig iron, this steel, tapping condition: T >=1630 DEG C, P≤0.005%;Molten steel is poured in ladle after dephosphorization.
2.LF stove: ladle proceeds to LF stove, adds CaC after LF puts in place2Deoxidation, consumption 2kg/t～3kg/t, adds Al powder1kg/t～2kg/t, is greater than 10min to electric slag, adds alloy material, adjusting component, tapping condition; T >=1650 DEG C, S≤0.010%。
3.VOD/VHD stove: molten steel scratches clean just and enters VOD tank after refining slag, adds deoxidier Al powder with slag charge (lime, fluorite)1.0kg/t～4.0kg/t, Ca-Si piece 0.5kg/t～4.0kg/t, vacuum outgas P≤100Pa, retention time >=15min.
4. tapping condition: 1560 DEG C～1580 DEG C of temperature, consutrode composition (1) should meet table 1 and specify.
Table 1%
5. (1) consutrode is poured into a mould: bet method is cast into the electrode steel ingot of consutrode, and electrode steel ingot dimensions is ф200mm×1750±10mm。
6. (1) consutrode joins through chemical composition inspection and the laggard luggage of removing surface, the smelting of (1) arranging in pairs or groups of every 3 consutrodesRefine 1 ф 360mm × 1050mm ESR ingot.
Second step, electroslag smelting casting
1. electroslag remelting is prepared
1. adopt two support arm electroslag refining furnaces;
2. adopt water mold (2), crystallizer (2) specification is ф 360/350 × 1050mm, and upper base diameter is ф360mm, the diameter of going to the bottom is ф 350mm, is highly 1050mm; (5) crystallizer 2 bottoms are provided with water cooled bottom plate.
2. prepare slag charge (3), slag system CaF2:Al2O3: MgO=65:30:5, quantity of slag 36kg.
3. slag making: by this steel grade heelpiece put into crystallizer (2) bottom, with graphite electrode crystallizer (2) in switch on the starting the arc, addEnter slag charge that 0.5kg proportioning is good (3).
Change slag, gradually the slag charge of 2/3 total amount (3) all add crystallizer (2) in, slag charge to be added (3) all fusingAfter, after (3) Al powder, Fe-Si powder mixed with the slag charge of residue 1/3 total amount, add crystallizer (2) in, until slag charge is all moltenChange.
5. remelting, (3) all hangs out graphite electrode after fusing until slag charge, adjusts parameters of electric power, changes consutrode (1) heavyMolten; (1) hang out when the 100 ± 10mm of top wait being melted to apart from consutrode, change another consutrode and (1) continue remelting, when the 3rd(1) consutrode arrived after remelting latter stage, adjusted parameters of electric power and proceeded to filling feeding operation, loading time 25min～30min.
6. add additives (7), (7) additives are made up of Al powder, Fe-Si powder, after (1) every consutrode is changed, and willAfter (7) the additives that calculate consumption mix, be laid in additives feeding machine (6) in, (6) will add by additives feeding machine(7) agent is accompanied by electrode remelting and (2) adds slag bath surface in upper end from crystallizer uniformly.
7. the control of electric slag refusion and smelting procedure parameter is as follows:
1. slag making operation: electric current 0V～2000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa；
2. change slag operation: electric current 2000A～4000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa；
3. remelting operation: electric current 6000A～7000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa；
4. feeding operation: electric current 5000A～2000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa。
(10) and water cooled bottom plate during electroslag remelting, by water adjusting valve discharge, crystallization control device coolant outlet I (2)(5) coolant outlet II (11) leaving water temperature is not more than 45 DEG C.
8. the de-ingot of ESR ingot: electroslag remelting finishes to take off electroslag ingot casting after 30min, covers cold 48h, unannealed. The change of ESR ingotStudy and point should meet table 2 and specify.
Table 2%
Two, non-metallic inclusion
Non-metallic inclusion should meet according to the evaluation of ASTME45 standard A method: category-A≤0.5 grade, category-B≤1.5 grade, C class≤ 0.5 grade, D class≤1.0 grade.
Innovative point of the present invention is:
(1) the innovative point of process for making:
For ensureing low Si, low Al supercritical turbine Blade Steel cleanliness factor, during making steel, need the strict chemistry of controlling to becomePoint, and reduce and be mingled with as far as possible.
1. electric arc furnaces: tapping condition: T >=1630 DEG C, P≤0.005%; Molten steel is poured in ladle after dephosphorization;
2. LF stove: ladle proceeds to LF stove, adds CaC after LF puts in place2Deoxidation, consumption 2kg/t～3kg/t, adds Al powder1kg/t, is greater than 10min to electric slag, adds alloy material, adjusting component, tapping condition; T >=1650 DEG C, S≤0.010%;
3. VOD/VHD stove: molten steel scratches clean just and enters VOD tank after refining slag, adds deoxidier Al powder with slag charge (lime, fluorite)1.5kg/t～4.0kg/t, vacuum outgas P≤100Pa, retention time >=15min;
4. the condition of tapping: 1560 DEG C～1580 DEG C of temperature;
5. consutrode cast: bet method is cast into the electrode steel ingot of consutrode, and electrode steel ingot dimensions is ф200mm×（1750±10）mm；
6. consutrode is joined through chemical composition inspection and the laggard luggage of removing surface, and every 3 consutrodes collocation is smelted 1ф 360mm × 1050mm ESR ingot.
(2) the innovative point of electroslag process
Scaling loss rule according to each element in Electroslag Process is calculated and is added additives, electricity to slag bath in Electroslag ProcessThere is displacement reaction after interacting in the utmost point, additives and slag, make system approach balance between them; Displacement reaction generatesOxide is absorbed by slag, reduces melting loss of elements, reaches the object that improves steel degree of purity.
1. adopt two support arm electroslag refining furnaces;
2. adopt water mold, crystallizer specification is ф 360/350 × 1050mm, and upper base diameter is ф 360mm, underEnd diameter is ф 350mm, is highly 1050mm; Crystallizer bottom is provided with water cooled bottom plate.
3. prepare slag charge, slag system CaF2:Al2O3: MgO=65:30:5, quantity of slag 36kg.
4. slag making: this steel grade heelpiece is put into crystallizer bottom, and the starting the arc of switching in crystallizer with graphite electrode, addsThe slag charge that 0.5kg proportioning is good.
5. change slag, gradually the slag charge of 2/3 total amount is all added in crystallizer, after slag charge to be added all melts, willAl powder, Fe-Si powder add in crystallizer after mixing with the slag charge of residue 1/3 total amount, until slag charge all melts.
6. remelting, all hangs out graphite electrode after fusing until slag charge, adjusts parameters of electric power, changes consutrode remelting; TreatWhile being melted to apart from consutrode top 100 ± 10mm, hang out, change another consutrode and continue remelting, when the 3rd consutrodeArrive after remelting latter stage, adjust parameters of electric power and proceed to filling feeding operation, loading time 25min～30min.
7. add additives, additives are made up of Al powder, Fe-Si powder, after every consutrode is changed, will calculate useAfter the additives of amount mix, be laid in additives feeding machine, by additives feeding machine, additives be accompanied by electrode weightMelt and add slag bath surface from crystallizer upper end uniformly.
8. the control of electric slag refusion and smelting procedure parameter is as follows:
Slag making operation: electric current 0V～2000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa；
Change slag operation: electric current 2000A～4000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa；
Remelting operation: electric current 6000A～7000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa；
Feeding operation: electric current 5000A～2000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa。
9. during electroslag remelting by water adjusting valve discharge, the coolant outlet of crystallization control device and water cooled bottom plate coldBut water out leaving water temperature is not more than 45 DEG C.
Beneficial effect of the present invention is: adopt the chemical composition of the ESR ingot of common electroslag furnace and new technology manufacture to meet technologyRegulation, non-metallic inclusion evaluation result meets technical stipulation; It is equal that ESR ingot entirety has chemical composition, oxygen content, degree of purityEven uniformity.
Brief description of the drawings
Fig. 1 is apparatus of the present invention schematic diagrames.
In figure: consutrode 1, crystallizer 2, slag charge 3, electroslag ingot casting 4, water cooled bottom plate 5, additives feeding machine 6, additives7, cooling water inlet I 8, cooling water inlet II 9, coolant outlet I 10, coolant outlet II 11.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described in detail.
Embodiment 1～embodiment 5 adopts same technological process: steel-making (electric arc furnaces+LF+VOD/VHD) → die casting is (from power consumptionUtmost point ф 200mm) → electroslag remelting (ESR ingot ф 360mm).
In this technological process, the same process step that embodiment 1～embodiment 5 has is as follows:
2. die casting: adopt bet method to be cast into the electrode steel ingot of consutrode, electrode steel ingot dimensions is ф 200mm×1750±10mm。
3. electroslag remelting: consutrode is joined through chemical composition inspection and the laggard luggage of removing surface, and every 3 consutrodes (1)1 ф 360mm × 1050mm ESR ingot is smelted in collocation.
(1) electroslag remelting process
1. adopt two support arm electroslag refining furnaces;
2. adopt water mold, crystallizer specification is ф 360mm/350mm × 1050mm, and upper base diameter is ф360mm, the diameter of going to the bottom is ф 350mm, is highly 1050mm; Crystallizer bottom is provided with water cooled bottom plate.
3. prepare slag charge, slag system CaF2:Al2O3: MgO=65:30:5, quantity of slag 36kg.
4. slag making: this steel grade heelpiece is put into crystallizer bottom, and the starting the arc of switching in crystallizer with graphite electrode, addsThe slag charge that 0.5kg proportioning is good.
5. change slag: gradually the slag charge of 2/3 total amount is all added in crystallizer, after slag charge to be added all melts, willAl powder, Fe-Si powder add in crystallizer after mixing with the slag charge of residue 1/3 total amount, until slag charge all melts.
6. remelting: all hang out graphite electrode after fusing until slag charge, adjust parameters of electric power, change consutrode remelting; TreatWhile being melted to apart from consutrode top 100mm ± 10mm, hang out, change another consutrode and continue remelting, when the 3rd from power consumptionThe utmost point arrived after remelting latter stage, adjusted parameters of electric power and proceeded to filling feeding operation, loading time 25min～30min.
(2) the control of electric slag refusion and smelting procedure parameter is as follows:
1. slag making operation: electric current 0V～2000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa；
2. change slag operation: electric current 2000A～4000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa；
3. remelting operation: electric current 6000A～7000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa；
4. feeding operation: electric current 5000A～2000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa。
During electroslag remelting by the discharge of water adjusting valve, the leaving water temperature of crystallization control device and water cooled bottom plate is littleIn 45 DEG C.
5. the de-ingot of ESR ingot: electroslag remelting finishes to take off electroslag ingot casting after 30min, covers cold 48h, unannealed.
Embodiment 1
1, process for making
1. eaf process
Total batch 31.83t, batching is selected high-quality steel scrap, the pig iron; Alloy material select low chromium, crome metal, nickel plate, ferrotungsten,Cobalt plate, molybdenum-iron, vanadium iron, ferro-niobium, ferro-boron and this steel returns. Tapping is controlled: C:0.06%, P:0.004%, tapping temperature 1684℃；
2. LF technique
Use aluminum shot and carbon dust carry out diffusive deoxidation and keep atmosphere, aluminium powder consumption is 35kg, CaC2Powder consumption is 75kg,Add in two batches, ensure white slag time 40min, 1660 DEG C of tapping temperatures, S:0.007%.
3. VOD/VHD stove
Molten steel scratches clean just and enters VOD tank after refining slag, adds deoxidier Al powder 49kg, Ca-Si piece 15 with slag charge (lime, fluorite)Kg, vacuum outgas P≤100Pa, retention time 15min.
4. the condition of tapping: 1578 DEG C of temperature. Consutrode composition is in table 4.
3, electroslag smelting casting
1. additives use amount
Electroslag remelting additives use amount is in table 3.
2. ESR ingot chemical composition
ESR ingot chemical composition is in table 4.
4, assay
1. nonmetal and foreign material assay is in table 5.
Embodiment 2
1, process for making
1. eaf process
Total batch 31.90t, batching is selected high-quality steel scrap, the pig iron; Alloy material is selected low chromium, crome metal, nickel plate, tungstenIron, cobalt plate, molybdenum-iron, vanadium iron, ferro-niobium, ferro-boron and this steel returns. Tapping is controlled: C:0.07%, P:0.005%, tapping temperature1655℃；
2. LF technique
Use aluminum shot and carbon dust carry out diffusive deoxidation and keep atmosphere, aluminium powder consumption is 41kg, CaC2Powder consumption is 80kg,Add in two batches, ensure white slag time 40min, 1670 DEG C of tapping temperatures, S:0.006%.
3. VOD/VHD stove
Molten steel scratches clean just and enters VOD tank after refining slag, adds deoxidier Al powder 35kg, Ca-Si piece with slag charge (lime, fluorite)20kg, vacuum outgas P≤100Pa, retention time 15min.
4. the condition of tapping: 1575 DEG C of temperature. Consutrode composition is in table 4.
3, electroslag smelting casting
1. additives use amount
Electroslag remelting additives use amount is in table 3.
2. ESR ingot chemical composition
ESR ingot chemical composition is in table 4.
4, assay
1. nonmetal and foreign material assay is in table 5.
Embodiment 3
1, process for making
1. eaf process
Total batch 31.88t, batching is selected high-quality steel scrap, the pig iron; Alloy material select low chromium, crome metal, nickel plate, ferrotungsten,Cobalt plate, molybdenum-iron, vanadium iron, ferro-niobium, ferro-boron and this steel returns. Tapping is controlled: C:0.06%, P:0.005%, tapping temperature 1680℃；
2. LF technique
Use aluminum shot and carbon dust carry out diffusive deoxidation and keep atmosphere, aluminium powder consumption is 40kg, CaC2Powder consumption is 70kg,Add in two batches, ensure white slag time 35min, 1680 DEG C of tapping temperatures, S:0.005%.
3. VOD/VHD stove
Molten steel scratches clean just and enters VOD tank after refining slag, adds deoxidier Al powder 35kg, Ca-Si piece with slag charge (lime, fluorite)30kg, vacuum outgas P≤100Pa, retention time 15min.
4. the condition of tapping: 1570 DEG C of temperature. Consutrode composition is in table 4.
3, electroslag smelting casting
1. additives use amount
Electroslag remelting additives use amount is in table 3.
2. ESR ingot chemical composition
ESR ingot chemical composition is in table 4.
4, assay
1. nonmetal and foreign material assay is in table 5.
Embodiment 4
1, process for making
1. eaf process
Total batch 31.50t, batching is selected high-quality steel scrap, the pig iron; Alloy material select low chromium, crome metal, nickel plate, ferrotungsten,Cobalt plate, molybdenum-iron, vanadium iron, ferro-niobium, ferro-boron and this steel returns. Tapping is controlled: C:0.05%, P:0.004%, tapping temperature 1678℃；
2. LF technique
Use aluminum shot and carbon dust carry out diffusive deoxidation and keep atmosphere, aluminium powder consumption is 50kg, CaC2Powder consumption is 70kg,Add in two batches, ensure white slag time 40min, 1670 DEG C of tapping temperatures, S:0.005%.
3. VOD/VHD stove
Molten steel scratches clean just and enters VOD tank after refining slag, adds deoxidier Al powder 40kg, Ca-Si piece with slag charge (lime, fluorite)30kg, vacuum outgas P≤100Pa, retention time 15min.
4. the condition of tapping: 1566 DEG C of temperature. Consutrode composition is in table 4.
3, electroslag smelting casting
1. additives use amount
Electroslag remelting additives use amount is in table 3.
2. ESR ingot chemical composition
ESR ingot chemical composition is in table 4.
4, assay
1. nonmetal and foreign material assay is in table 5.
Embodiment 5
1, process for making
1. eaf process
Total batch 31.48t, batching is selected high-quality steel scrap, the pig iron; Alloy material select low chromium, crome metal, nickel plate, ferrotungsten,Cobalt plate, molybdenum-iron, vanadium iron, ferro-niobium, ferro-boron and this steel returns. Tapping is controlled: C:0.04%, P:0.004%, tapping temperature 1690℃；
2. LF technique
Use aluminum shot and carbon dust carry out diffusive deoxidation and keep atmosphere, aluminium powder consumption is 45kg, CaC2Powder consumption is 80kg,Add in two batches, ensure white slag time 35min, 1665 DEG C of tapping temperatures, S:0.007%.
3. VOD/VHD stove
Molten steel scratches clean just and enters VOD tank after refining slag, adds deoxidier Al powder 50kg, Ca-Si piece with slag charge (lime, fluorite)25kg, vacuum outgas P≤100Pa, retention time 15min.
4. the condition of tapping: 1580 DEG C of temperature. Consutrode composition is in table 4.
3, electroslag smelting casting
1. additives use amount
Electroslag remelting additives use amount is in table 3.
2. ESR ingot chemical composition
ESR ingot chemical composition is in table 4.
4, assay
1. nonmetal and foreign material assay is in table 5.
Table 3 electroslag remelting additives use amount
Table 4 chemical composition assay %
Table 5 examination of nonmetallic inclusion result
Claims (2)
1. a manufacture method for supercritical turbine Blade Steel electroslag remelting steel ingot, is characterized in that: described manufacture methodConcrete technology step is as follows:
The first step, adopts electric arc furnaces+LF+VOD/VHD stove mode to smelt the consumable utmost point (1):
1) electric arc furnaces: furnace charge is returned and formed by steel scrap and the pig iron and this steel, tapping condition: T >=1630 DEG C, P≤0.005%; Molten steelAfter dephosphorization, pour in ladle;
2) LF stove: ladle proceeds to LF stove, adds CaC after LF stove puts in place2Deoxidation, consumption 2kg/t～3kg/t, adds Al powder 1kg/t～2kg/t, is greater than 10min to electric slag, adds alloy material, adjusting component, tapping condition; T >=1650 DEG C, S≤0.010%;
3) VOD/VHD stove: molten steel scratches clean just and enters VOD tank after refining slag, adds deoxidier Al powder 1.0kg/t with slag charge lime and fluorite～4.0kg/t, Ca-Si piece 0.5kg/t～4.0kg/t, vacuum outgas P≤100Pa, retention time >=15min;
4) tapping condition: 1560 DEG C～1580 DEG C of temperature, consutrode composition (1) should meet table 1 and specify;
Table 1%
5) (1) consutrode is poured into a mould: bet method is cast into the electrode steel ingot of consutrode, and electrode steel ingot dimensions is ф 200mm×1750±10mm；
6) (1) consutrode joins through chemical composition inspection and the laggard luggage of removing surface, and (1) every 3 consutrodes are arranged in pairs or groups and smelted 1ф 360mm × 1050mm ESR ingot;
Second step, electroslag smelting casting
1) electroslag remelting is prepared
1. adopt two support arm electroslag refining furnaces;
2. adopt water mold (2), crystallizer (2) specification is ф 360/350 × 1050mm, and upper base diameter is ф 360mm, underEnd diameter is ф 350mm, is highly 1050mm; (5) crystallizer (2) bottom is provided with water cooled bottom plate;
2) prepare slag charge (3), slag system CaF2:Al2O3: MgO=65:30:5, quantity of slag 36kg;
3) slag making: by this steel grade heelpiece put into crystallizer (2) bottom, with graphite electrode crystallizer (2) in switch on the starting the arc, addThe good slag charge of 0.5kg proportioning (3);
4) change slag, gradually the slag charge of 2/3 total amount (3) all add crystallizer (2) in, slag charge to be added (3) all fusing after,After (3) Al powder, Fe-Si powder mixed with the slag charge of residue 1/3 total amount, add crystallizer (2) in, until slag charge all melts;
5) remelting, (3) all hangs out graphite electrode after fusing until slag charge, adjusts parameters of electric power, changes (1) remelting of consutrode; TreatBe melted to apart from consutrode and (1) hang out when the 100 ± 10mm of top, change another consutrode and (1) continue remelting, when the 3rd consumable(1) electrode arrived after remelting latter stage, adjusted parameters of electric power and proceeded to filling feeding operation, loading time 25min～30min;
6) add additives (7), (7) additives are made up of Al powder and Fe-Si powder, after (1) every consutrode is changed, will calculateThe additives of good consumption after (7) mixing, be laid in additives feeding machine (6) in, by additives feeding machine (6) by additives (7)Be accompanied by electrode remelting and (2) add slag bath surface in upper end from crystallizer uniformly;
7) electric slag refusion and smelting process is strictly controlled technological parameter;
8) the de-ingot of ESR ingot: electroslag remelting finishes to take off electroslag ingot casting after 30min, covers cold 48h, unannealed.
2. a kind of manufacture method of supercritical turbine Blade Steel electroslag remelting steel ingot according to claim 1, its featureBe: the control of described electric slag refusion and smelting procedure parameter is as follows:
1) slag making operation: electric current 0V～2000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa;
2) change slag operation: electric current 2000A～4000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa；
3) remelting operation: electric current 6000A～7000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18MPa;
4) feeding operation: electric current 5000A～2000A, voltage 53V～62V, water temperature≤45 DEG C, hydraulic pressure 0.12MPa～0.18Mpa；
5) during electroslag remelting by water adjusting valve discharge, crystallization control device coolant outlet I (2) (10) with water cooled bottom plate (5)Coolant outlet II (11) leaving water temperature be not more than 45 DEG C.
Priority Applications (1)
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| CN105483323A (en) * | 2015-12-03 | 2016-04-13 | 抚顺特殊钢股份有限公司 | Manufacturing method of 12Cr13 pipe blank for nuclear power plant reactor control rod drive mechanism |
| CN105886791B (en) * | 2016-06-22 | 2018-07-24 | 四川六合锻造股份有限公司 | A method of prevent low-silicon steel from increasing silicon in electroslag remelting |
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| CN115505746A (en) * | 2022-08-29 | 2022-12-23 | 重庆大学 | Smelting method of electroslag remelting ultra-clean steel |
| CN119120835B (en) * | 2024-11-13 | 2025-01-28 | 山东豪迈机械科技股份有限公司 | Method for smelting high-alloy heat-resistant steel castings of ultra-supercritical steam turbine |
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