CN105039733A - Electroslag remelting method for Ti-contained nickel-base superalloy - Google Patents

Electroslag remelting method for Ti-contained nickel-base superalloy Download PDF

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Publication number
CN105039733A
CN105039733A CN201510521771.XA CN201510521771A CN105039733A CN 105039733 A CN105039733 A CN 105039733A CN 201510521771 A CN201510521771 A CN 201510521771A CN 105039733 A CN105039733 A CN 105039733A
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China
Prior art keywords
slag
yuan
esr
powder
electroslag
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CN201510521771.XA
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曾莉
王岩
徐芳泓
李阳
李莎
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Taiyuan Iron and Steel Group Co Ltd
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Taiyuan Iron and Steel Group Co Ltd
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Abstract

The invention relates to an electroslag remelting method for Ti-contained nickel-base superalloy. The method includes the steps that I, ternary pre-melted slag containing CaF2, Al2O3 and CaO is secondarily purified; II, the purified ternary pre-melted slag is broken; III, MgO powder and TiO2 powder are added to the ternary pre-melted slag to form pentabasic slag; IV, high-temperature baking at the temperature of 800 DEG C to 850 DEG C is conducted on the pentabasic slag for 4 h to 6 h before the pentabasic slag is used; V, Al powder is mixed into the pentabasic slag before electroslag remelting, and the Al powder is used by 0.06-0.09 Kg per 1000 kg of consumable electrodes; and VI, auxiliary materials with the weight of 30% to 35% are firstly added to the bottom of a crystallizer, the auxiliary materials are the electroslag material and the turned material of the same steel type, the weight of the turned material ranges from 1.5 Kg to 3 Kg, electroslag remelting is started, and the remaining electroslag material is gradually added after electroslag remelting is started for 20 min. According to the method, the difference value of the Ti content of the head and the Ti content of the tail of an electroslag ingot is not larger than 0.1%, and the surface quality of the electroslag ingot is improved.

Description

A kind of containing Ti nickel base superalloy electro-slag re-melting method
Technical field
The invention belongs to electric slag refusion and smelting technical field, particularly relate to a kind of containing Ti nickel base superalloy electro-slag re-melting method.
Background technology
The important process that esr nickel base superalloy is produced, have strong, the de-S ability of de-inclusion ability strong, improve the series of advantages such as ingot solidification tissue.For regular grade to high-end level nickel base superalloy, esr can as second or final road manufacturing process.In now widely used nickel base superalloy, all containing a certain amount of Ti element.Ti and Ni in alloy combines, and forms a certain amount of nano level Ni 3ti precipitate, makes alloy have higher mechanical property and creep rupture strength under the high temperature conditions.Generally, in order to make Ni in alloy 3ti precipitate is stablized, and can add a certain amount of Al simultaneously, forms Ni 3(Al, Ti) precipitate.But, nickel base superalloy containing a certain amount of Ti element can run in esr process that Ti scaling loss is serious, ESR ingot end to end Ti content have big difference, general difference is greater than 0.2%, and pit appears in ESR ingot surface, the even problem such as crackle, thus affect the use properties of the finished product.And be the TiO in slag system for what have the greatest impact containing Ti nickel base superalloy esr Ti scaling loss and surface quality 2content.
Summary of the invention
In order to overcome the existing above-mentioned deficiency containing Ti nickel base superalloy electro-slag re-melting method, the invention provides a kind of containing Ti nickel base superalloy electro-slag re-melting method, by the method in the alloy simultaneously containing under Al condition, ESR ingot end to end Ti content difference is not more than 0.1%, and ESR ingot surface quality is significantly improved.
This comprises following step successively containing Ti nickel base superalloy electro-slag re-melting method:
iwill containing CaF 2(40% ~ 55%), Al 2o 3(15% ~ 25%) and CaO(15% ~ 25%) common ternary pre-melted slag carries out secondary purification, makes SiO wherein 2≤ 0.5%.
iIternary pre-melted slag after purifying is carried out fragmentation, requires broken rear ternary pre-melted slag equivalent particle diameter≤3mm.
iIIby pure MgO and TiO 2powder (equivalent particle diameter≤1mm), joins ternary pre-melted slag, is uniformly mixed into five yuan of slags.Wherein in five yuan of slags, MgO weight percent controls between 3% ~ 6%, TiO in five yuan of slags 2shared weight percent need be calculated as follows (not considering other components except five yuan of slags and foreign matter content):
TiO 2ti content % × N in Ni content % × M+ alloy in %=alloy
Wherein, M is that Ni contains quantity correction coefficient, value 0.01 ~ 0.012; N is that Ti contains quantity correction coefficient, value 1.8 ~ 2.2.
iVfive yuan of slags need through 800 DEG C ~ 850 DEG C before use, 4h ~ 6h high bake, and when using, slag temperature is not less than 100 DEG C.Five yuan of slag usage quantitys use 30-35Kg meter according to every 1000Kg consumable electrode weight.
vprepare suitable Al powder (equivalent particle diameter≤3mm), be evenly mixed in five yuan of slags before esr, Al powder usage quantity uses 0.06-0.09Kg by every 1000Kg consumable electrode.
vIfirst add the auxiliary material of 30% ~ 35% weight at crystalliser feet, auxiliary material is electroslag material and suitably with steel grade turning material, and turning material weight is about between 1.5-3Kg and starts esr, and residual electricity slag charge adds gradually in 20min after esr starts.
Further, above-mentioned containing Ti nickel base superalloy electro-slag re-melting method in step vIin, esr process adopts melting speed control 4Kg/min ~ 6Kg/min, and the starting the arc stage can adopt large molten fast 8Kg/min ~ 10Kg/min, molten fast employing time≤20min.
Technical solution of the present invention major advantage
1) chemical composition of different steel grade and physical property different, can allocate slag system according to as above technical scheme, make chemical Composition Control accurate.
2) deoxidation can be carried out at the esr initial stage to electroslag adding of Al powder, its gas content be reduced, it also avoid a large amount of scaling loss of Ti in consumable electrode simultaneously, make ESR ingot end to end Ti content reach unanimity.
3) the esr starting stage adopts large molten speed, slag charge can be made to melt evenly, improve ESR ingot surface quality.
Adopt as above technical scheme, ESR ingot is Ti content difference≤0.1% end to end, and ESR ingot surface quality is significantly improved.
Embodiment
The specific embodiment of the present invention is described in detail, to have further understanding to design of the present invention, the technical problem solved, technical characteristic below in conjunction with embodiment.But following be embodiment is not limitation of the present invention.
embodiment one
Adopt 1000Kg electroslag remelting furnace to smelt Inconel740H alloy, consumable electrode weight is 1000Kg.Containing (mass percent) Ni-48%, Cr-25%, Co-20%, Al-1.4%, Ti-1.4% element in alloy.
The present embodiment takes the step of following precedence:
iwill containing CaF 2(40% ~ 55%), Al 2o 3(15% ~ 25%) and CaO(15% ~ 25%) common ternary pre-melted slag carries out secondary purification, and after purification, SiO2 is wherein 0.33%;
iIternary pre-melted slag after purifying is carried out fragmentation, requires that broken rear ternary pre-melted slag equivalent particle diameter is 2mm;
iIIby pure MgO and TiO 2powder, equivalent particle diameter 0.5mm, joins ternary pre-melted slag, is uniformly mixed into five yuan of slags.
TiO 2in five yuan of slag systems, shared weight percent is: 48% × 0.01+1.4% × 2.0=3.28%, value 3.3%.The final five yuan of each component ratios of slag system allocated are: CaF 2: Al 2o 3: CaO:MgO:TiO 2=51:21:20.2:4.5:3.3.
iVfive yuan of slags need through 800 DEG C before use, 6h high bake, and slag temperature 120 DEG C when using, use five yuan of quantity of slag to be 33Kg.
vprepare suitable Al powder (equivalent particle diameter 2mm), be evenly mixed in five yuan of slags before esr, this Al powder usage quantity is 0.065Kg.
vIbefore esr, first add 10Kg(five yuan of slags+mixing Al powder at crystalliser feet) and 1.8Kg with steel grade turning material, start esr, residue (five yuan of slag+mixing Al powder) add gradually in 18min after esr starts.Esr process adopts melting speed control (4.5Kg/min), and the starting the arc stage adopts large molten speed (8Kg/min), molten fast employing time 19min.
After esr, gained Inconel740H ESR ingot surface quality is smooth.Sample end to end in ESR ingot, analyze Ti element, head Ti=1.36%, afterbody Ti=1.31%, difference 0.05%, meets the demands.
embodiment two:
Adopt 1000Kg electroslag remelting furnace to smelt 617B alloy, consumable electrode weight is 1000Kg.Containing Ni-55%, Cr-22%, Co-12%, Mo-9% in alloy, Al-1.2%, Ti-0.5% element.
The present embodiment takes the step of following precedence:
iwill containing CaF 2(40% ~ 55%), Al 2o 3(15% ~ 25%) and CaO(15% ~ 25%) common ternary pre-melted slag carries out secondary purification, and after purification, SiO2 is wherein 0.35%;
iIternary pre-melted slag after purifying is carried out fragmentation, requires that broken rear ternary pre-melted slag equivalent particle diameter is 1.5mm;
iIIby pure MgO and TiO 2powder, equivalent particle diameter 0.6mm, joins ternary pre-melted slag, is uniformly mixed into five yuan of slags.
TiO 2in five yuan of slag systems, shared weight percent is: 55% × 0.01+0.5% × 2.2=1.65%, value 1.7%.The final five yuan of each component ratios of slag system allocated are: CaF 2: Al 2o 3: CaO:MgO:TiO 2=49:22.2:22:5.1:1.7.
iVfive yuan of slags need through 820 DEG C before use, 6h high bake, and slag temperature 110 DEG C when using, use five yuan of quantity of slag to be 31Kg.
vprepare suitable Al powder (equivalent particle diameter 2mm), be evenly mixed in five yuan of slags before esr, this Al powder usage quantity is 0.075Kg.
vIbefore esr, first add 10Kg(five yuan of slags+mixing Al powder at crystalliser feet) and 2.3Kg with steel grade turning material, start esr, residue (five yuan of slag+mixing Al powder) add gradually in 15min after esr starts.Esr process adopts melting speed control (4.8Kg/min), and the starting the arc stage adopts large molten speed (9Kg/min), large molten fast employing time 17min.
After esr, after gained esr, gained 617B ESR ingot surface quality is smooth.Sample end to end in ESR ingot, analyze Ti element, head Ti=0.49%, afterbody Ti=0.47%, difference 0.02%, meets the demands.

Claims (2)

1., containing a Ti nickel base superalloy electro-slag re-melting method, it comprises following step successively:
iwill containing CaF 2, Al 2o 3and the ternary pre-melted slag of CaO carries out secondary purification, makes SiO wherein 2≤ 0.5%;
iIternary pre-melted slag after purifying is carried out fragmentation, requires broken rear ternary pre-melted slag equivalent particle diameter≤3mm;
iIIby pure MgO and TiO 2powder joins ternary pre-melted slag, is uniformly mixed into five yuan of slags; Wherein in five yuan of slags, MgO weight percent controls between 3% ~ 6%, TiO in five yuan of slags 2shared weight percent need be calculated as follows:
TiO 2ti content % × N in Ni content % × M+ alloy in %=alloy
Wherein, M is that Ni contains quantity correction coefficient, value 0.01 ~ 0.012; N is that Ti contains quantity correction coefficient, value 1.8 ~ 2.2;
iVfive yuan of slags before use through 800 DEG C ~ 850 DEG C, 4h ~ 6h high bake, and when using, slag temperature is not less than 100 DEG C, five yuan of slag usage quantitys use 30-35Kg meter according to every 1000Kg consumable electrode weight;
vprepare Al powder, be evenly mixed in five yuan of slags before esr, Al powder usage quantity uses 0.06-0.09Kg by every 1000Kg consumable electrode;
vIfirst add the auxiliary material of 30% ~ 35% weight at crystalliser feet, auxiliary material is electroslag material and with steel grade turning material, and turning material weight is start esr between 1.5-3Kg, and residual electricity slag charge adds gradually in 20min after esr starts.
2. according to claim 1 containing Ti nickel base superalloy electro-slag re-melting method, it is characterized in that: in step vIin, esr process adopts melting speed control 4Kg/min ~ 6Kg/min, and the starting the arc stage can adopt large molten fast 8Kg/min ~ 10Kg/min, molten fast employing time≤20min.
CN201510521771.XA 2015-08-24 2015-08-24 Electroslag remelting method for Ti-contained nickel-base superalloy Pending CN105039733A (en)

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
CN105861847A (en) * 2016-04-19 2016-08-17 四川六合锻造股份有限公司 Quinary electroslag remelting system and production method applying quinary electroslag remelting system to 3379B blade steel material
CN106756077A (en) * 2016-10-20 2017-05-31 深圳市万泽中南研究院有限公司 A kind of high temperature alloy electroslag remelting slag system and its application method
CN110144468A (en) * 2019-07-01 2019-08-20 建龙北满特殊钢有限责任公司 A kind of electroslag furnace control oxygen slag system and preparation method thereof
CN111172403A (en) * 2020-01-07 2020-05-19 北京钢研高纳科技股份有限公司 Pre-melted slag for smelting electroslag remelting continuous directional solidification high-temperature alloy ingot and application thereof
CN111534713A (en) * 2020-07-07 2020-08-14 北京钢研高纳科技股份有限公司 Purification treatment method of cast high-temperature alloy return material and high-temperature alloy
CN112899490A (en) * 2021-01-19 2021-06-04 苏州大学 Pre-melted slag for electroslag remelting titanium-containing steel and method for preparing electroslag remelting low-oxygen titanium-containing steel through deoxidation

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105861847A (en) * 2016-04-19 2016-08-17 四川六合锻造股份有限公司 Quinary electroslag remelting system and production method applying quinary electroslag remelting system to 3379B blade steel material
CN106756077A (en) * 2016-10-20 2017-05-31 深圳市万泽中南研究院有限公司 A kind of high temperature alloy electroslag remelting slag system and its application method
CN110144468A (en) * 2019-07-01 2019-08-20 建龙北满特殊钢有限责任公司 A kind of electroslag furnace control oxygen slag system and preparation method thereof
CN110144468B (en) * 2019-07-01 2020-12-25 建龙北满特殊钢有限责任公司 Oxygen-controlled slag system of electroslag furnace and preparation method thereof
CN111172403A (en) * 2020-01-07 2020-05-19 北京钢研高纳科技股份有限公司 Pre-melted slag for smelting electroslag remelting continuous directional solidification high-temperature alloy ingot and application thereof
CN111534713A (en) * 2020-07-07 2020-08-14 北京钢研高纳科技股份有限公司 Purification treatment method of cast high-temperature alloy return material and high-temperature alloy
CN111534713B (en) * 2020-07-07 2020-10-16 北京钢研高纳科技股份有限公司 Purification treatment method of cast high-temperature alloy return material and high-temperature alloy
CN112899490A (en) * 2021-01-19 2021-06-04 苏州大学 Pre-melted slag for electroslag remelting titanium-containing steel and method for preparing electroslag remelting low-oxygen titanium-containing steel through deoxidation
CN112899490B (en) * 2021-01-19 2022-03-15 苏州大学 Pre-melted slag for electroslag remelting titanium-containing steel and method for preparing electroslag remelting low-oxygen titanium-containing steel through deoxidation

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Application publication date: 20151111