CN102806337A - Processing method of solution strengthening-type nickel-based alloy electroslag ingot hot delivery homogenous cogging - Google Patents
Processing method of solution strengthening-type nickel-based alloy electroslag ingot hot delivery homogenous cogging Download PDFInfo
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- CN102806337A CN102806337A CN2012102920165A CN201210292016A CN102806337A CN 102806337 A CN102806337 A CN 102806337A CN 2012102920165 A CN2012102920165 A CN 2012102920165A CN 201210292016 A CN201210292016 A CN 201210292016A CN 102806337 A CN102806337 A CN 102806337A
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Abstract
The invention discloses a processing method of solution strengthening-type nickel-based alloy electroslag ingot hot delivery homogenous cogging. The method comprises the following steps: (1) controlling the flow rates of cooling water of a water tank which is arranged at the bottom of a crystallizer to be 75%, 50% and 30% of the normal flow rate when the electroslag ingot is smelted to 1/3, 1/2 and 3/4 respectively, demoulding 45 min after re-smelting is completed, covering with a heat-insulating cover, and feeding into an annealing furnace within 15 min; (2) ensuring that the surface temperature of the electroslag ingot which is fed into the annealing furnace is more than or equal to 850 DEG C, and ensuring that the temperature is 1210 DEG C, the time is 48 h and the tapping temperature is 1210 DEG C; and (3) taking the electroslag ingot out of the annealing furnace and loading to a trolley, ensuring that the surface temperature of the electroslag ingot which is fed into a heating furnace in a hot working workshop is more than or equal to 850 DEG C, and ensuring that the material-receiving temperature of the heating furnace is 1130 DEG C. The processing method has the characteristics of short production period and low metallurgical cost. Compared with the prior art, the heating time is shortened by 28 h, the production period is reduced by 2 days, the rejection rate of electroslag ingots is reduced to zero, and the rate of finished products is increased by 7%. The quality of finished products meets the standard ASMESB-167, and the economic benefit is significant.
Description
Technical field
The present invention relates to metallurgy industry send the cogging that homogenizes with solution strengthening type nickel-base alloy ESR ingot heat process.
Background technology
Hot feed technique generally is meant the steel ingot after the cast, without being cooled to this process of room temperature, carries out hot-working and directly enter into after heating furnace heats.
For the material that has transformation temperature, heat is sent temperature to be higher than to be called elevated temperature heat more than the AC3 and is sent, and heat is sent temperature to be lower than AC1 to be called low-temperature heat and to send.
Steel ingot heat is sent and can be reduced energy resource consumption greatly, boosts productivity, and reduces production costs extensive use in steel production enterprise.And for ESR ingot, especially do not have transformation temperature, the relatively poor nickel-base alloy kind of thermal conductivity, because its material and mode of production particularity adopt heat to send mode to produce hardly.
According to definition, ni content is called nickel-base alloy more than or equal to the material more than 50%.Nickel-base alloy is divided into solution strengthening type and precipitation strength type according to schedule of reinforcement.
GH3700 nickel-base alloy, its main component are 55Ni-22Cr-12Co-9Mo, and it belongs to solution strengthening type nickel-base alloy.Because this material alloys constituent content is very high, segregation is comparatively serious, needs that it is carried out high temperature homogenization and handles.And ESR ingot is in the heating and cooling cyclic process, and temperature is comparatively responsive to external world, because the ESR ingot inside and outside temperature difference is prone to produce thermal stress, in process of production, ESR ingot is prone to produce cracking phenomena.
At present; For the GH3700 nickel-base alloy; Its mode of production adopts: raw material preparation → vacuum induction is smelted; Cast electrode bar → electroslag remelting → ESR ingot air cooling to room temperature → ESR ingot is transported to annealing furnace → ESR ingot advance and retreat stove homogenizing anneal (annealing furnace furnace temperature≤400 ℃ when going into stove; Programming rate≤80 ℃/h) → ESR ingot cools to the furnace≤and 900 ℃ the time, take out air cooling to room temperature → ESR ingot and be transported to hot-working heating furnace → ESR ingot and get into the heating of hot-working heating furnace (furnace temperature of heating furnace when going into stove≤400 ℃, programming rate≤80 ℃/h) → hot-working/cogging.In traditional " electroslag remelting → ESR ingot air cooling to room temperature → cold charge stove → control heats up, homogenizes → stove is cold, take out air cooling to room temperature → control intensification, soaking → hot-working/cogging " production technology; On the one hand, in esr process, be not optimized adjusting for the end crystallizer cooling water of controlling process of setting; Cause the ESR ingot head and tail temperature difference bigger thus; Electroslag remelting finishes after the demoulding, and surface temperature is unbalanced, and is difficult to reach 850 ℃; On the other hand, because material has the particularity of poor thermal conductivity, furnace temperature and firing rate were strict when ESR ingot was gone into stove.Be to guarantee safety, furnace temperature should≤400 ℃ when general ESR ingot was gone into stove, and programming rate≤80 ℃/h are in order to avoid because the excessive formation thermal stress of internal-external temperature difference makes the ESR ingot cracking.Cause annealing furnace and the heating furnace can not continuous high temperature work thus, the production cycle prolongs, and increases the weight of that annealing furnace and heating furnace heat up, the soaking burden, has had a strong impact on production efficiency, and (energy consumption increases, time lengthening) wastes energy.And, ESR ingot in process air cooler (winter for example because influence of external environment; Outdoor temperature is lower; Near near factory building factory door, perhaps because the convection current of cold air in the factory building), the ESR ingot surface temperature is reduced fast; Thereby cause the ESR ingot internal-external temperature difference excessive, cause the ESR ingot cracking.
Summary of the invention
The present invention is in view of the problem that exists in the above-mentioned technology, provides a kind of solution strengthening type nickel-base alloy ESR ingot heat to send the process of the cogging that homogenizes.One of purpose shortens the production cycle, reduces metallurgical cost; Two of purpose is eliminated the ESR ingot cracking phenomena, improves the hot-working rate of becoming a useful person.
The present invention develops the process that a kind of solution strengthening type nickel-base alloy ESR ingot heat is sent the cogging that homogenizes, and serves as that kind is implemented in test with the GH3700 nickel-base alloy, through the control electroslag remelting process and utilize its Physical Metallurgy characteristic (material temperature is＜850 ℃ the time; Characteristics with poor thermal conductivity; And material temperature is in the time of >=850 ℃, and its thermal conductivity factor significantly improves, and this moment, programming rate need not control); Control rhythm of production simultaneously; Replace traditional " ESR ingot is cold send homogenize, coldly send the heating cogging " with " ESR ingot heat is sent and homogenized, heat send the heating cogging ", solved long problem of nickel-base alloy GH3700 production cycle, reduce the ingot cracking risk; Greatly reduce the metallurgical production cost of making simultaneously, satisfy the user and the market demand.
A kind of solution strengthening type nickel-base alloy ESR ingot heat provided by the invention is sent the process of the cogging that homogenizes; It is characterized in that adopting " control electroslag remelting "+the three-step approach heat of " heat deliver to annealing furnace homogenize processings "+" the ESR ingot elevated temperature heat is sent " send technology, and satisfy the ESR ingot surface temperature and send requirement with the advance and retreat heat of stove of >=850 ℃ temperature:
The remelting of said control ESR ingot: i.e. during ESR ingot melting to 1/3, the cooling water flow of water tank at the bottom of the minimizing crystallizer, cooling water flow is the 70-75% (the normal water flow is 100L/min) of normal discharge; During ESR ingot melting to 1/2, the water tank cooling water flow is the 45-55% of normal discharge at the bottom of the crystallizer; During ESR ingot melting to 3/4; The water tank cooling water flow is the 25-30% of normal discharge at the bottom of the crystallizer; And remain to electroslag remelting and finish (the process that electroslag remelting is a local melting, refining, solidify; Through water tank cooling water flow at the bottom of the control electroslag remelting different phase, the ESR ingot head and tail temperature difference is reduced, do not influence the ESR ingot metallurgical quality simultaneously); Remelting finishes the back 40-50min ESR ingot demoulding, covers with stay-warm case immediately after the ESR ingot demoulding, and the stove of in 15min, advancing and retreat, and guarantees charging temperature >=850 ℃.
The processing that homogenizes of said annealing furnace: promptly ESR ingot is gone into stove surface temperature >=850 ℃, and the holding temperature of annealing furnace is 1180 ℃-1220 ℃, and the processing time that homogenizes is 40-48h; 1180-1220 ℃ of steel ingot tapping temperature;
Said ESR ingot elevated temperature heat is sent: promptly adopt small-sized thermal car heat to send ESR ingot, and entrucking immediately after ESR ingot takes out in the annealing furnace, the ESR ingot time≤10min that unloads in the hot-working workshop keeps the continuity and the compactedness of rhythm of production; Surface temperature>=850 ℃ when ESR ingot is packed hot-working workshop heating furnace into, the temperature to be expected of hot-working workshop heating furnace is 1110-1140 ℃.
Compare with prior art, the present invention has following advantage:
(1) production cycle significantly shortens.
(2) metallurgical manufacturing cost significantly reduces.
(3) effectively solve the ESR ingot cracking phenomena.
(4) improve the hot-working rate of becoming a useful person.
The specific embodiment
Except that kind was implemented in test, the present invention can also be suitable for other solution strengthening type nickel-base alloy kinds, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.
Embodiment: the embodiment of the invention serves as that kind is implemented in test with the GH3700 nickel-base alloy; Adopt " control electroslag remelting "+the three-step approach heat of " heat deliver to annealing furnace homogenize processing "+" the ESR ingot elevated temperature heat is sent " send technology; Satisfy nickel-base alloy GH3700 ESR ingot (weighing 1 ton) surface temperature and send requirement: (1) control ESR ingot remelting: during ESR ingot melting to 1/3 with >=850 ℃ the temperature advance and retreat stove and the heat of hot-working workshop heating furnace; The cooling water flow of water tank at the bottom of the minimizing crystallizer, cooling water flow is 75% of a normal discharge; During ESR ingot melting to 1/2, the water tank cooling water flow is 50% of a normal discharge at the bottom of the crystallizer; During ESR ingot melting to 3/4, the water tank cooling water flow is 30% of a normal discharge at the bottom of the crystallizer, and remains to the electroslag remelting end; Remelting finishes the back 45min ESR ingot demoulding, covers with stay-warm case immediately after the ESR ingot demoulding, and the stove of in 10min, advancing and retreat.(2) the annealing furnace processing that homogenizes: ESR ingot head surface temperature is 910 ℃ when going into stove, 870 ℃ of tail surface temperature, 40 ℃ of head and tail temperature differences; The annealing furnace temperature was 1210 ℃ when ESR ingot was gone into stove, and the processing time that homogenizes is 48h.(3) the ESR ingot elevated temperature heat is sent: adopt small-sized thermal car heat to send ESR ingot, its surface temperature was 1130 ℃ when ESR ingot was packed thermal car into, and the ESR ingot time of unloading is 7min in the hot-working workshop; Surface temperature was 1010 ℃ when ESR ingot was packed hot-working workshop heating furnace into, and the temperature to be expected of hot-working workshop heating furnace is 1130 ℃.The embodiment of the present invention patent is carried out heat to nickel-base alloy GH3700 ESR ingot and is sent the cogging that homogenizes; Have with short production cycle, metallurgical low cost of manufacture, improve the characteristics of lumber recovery, compare with traditional " ESR ingot is cold send homogenize, coldly send the heating cogging ", annealing furnace has shortened 16h heat time heating time; Hot-working workshop heating furnace has shortened 12h heat time heating time; Reduce energy consumption greatly, alleviated intensification, the soaking burden of annealing furnace and heating furnace, and shorten about 2 days of production cycle; The ESR ingot scrappage is reduced to 0 by 3.8%, and the hot-working rate of becoming a useful person is increased to 85% by 78%.By the GH3700 finished product tubing that heat send the cogging technics that homogenizes to produce, its quality satisfies ASME SB-167 standard, remarkable in economical benefits.
Normal water flow in the present embodiment is 100L/min.
Claims (1)
1. a solution strengthening type nickel-base alloy ESR ingot heat is sent the process of the cogging that homogenizes, it is characterized in that adopting " control electroslag remelting "+the three-step approach heat of " heat deliver to annealing furnace homogenize processing "+" the ESR ingot elevated temperature heat is sent " send technology:
The remelting of said control ESR ingot: i.e. during ESR ingot melting to 1/3, the water tank cooling water flow is the 70-75% of normal discharge at the bottom of the crystallizer; During ESR ingot melting to 1/2, the water tank cooling water flow is the 45-55% of normal discharge at the bottom of the crystallizer; During ESR ingot melting to 3/4, the water tank cooling water flow is the 25-30% of normal discharge at the bottom of the crystallizer, and remains to the electroslag remelting end; Remelting finishes the back 40-50min ESR ingot demoulding, covers with stay-warm case immediately after the ESR ingot demoulding, and the stove of in 15min, advancing and retreat;
The processing that homogenizes of said annealing furnace: promptly ESR ingot is gone into stove surface temperature >=850 ℃, and the holding temperature of annealing furnace is 1180 ℃-1220 ℃, and the processing time that homogenizes is 40-48h; 1180-1220 ℃ of ESR ingot tapping temperature;
Said ESR ingot elevated temperature heat is sent: adopt small-sized thermal car heat to send ESR ingot, and entrucking immediately after ESR ingot takes out in the annealing furnace, surface temperature when ESR ingot is packed heating furnace into >=850 ℃, the temperature to be expected of hot-working workshop heating furnace is 1110-1140 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114273643A (en) * | 2021-12-16 | 2022-04-05 | 舞阳钢铁有限责任公司 | Method for improving percent of pass of large single-weight high-alloy electroslag ingot |
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| CN1453388A (en) * | 2002-04-27 | 2003-11-05 | 艾默生电气（中国）投资有限公司 | Magnetic and heating treatment method to improve magnetically driven reversible strain property of polycrystalline Ni2 MnGa |
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| EP1377690B1 (en) * | 2001-03-08 | 2008-01-09 | ATI Properties, Inc. | Method for producing large diameter ingots of nickel base alloys |
| CN101486135A (en) * | 2008-01-18 | 2009-07-22 | 中国科学院金属研究所 | GH4169 high-temperature alloy welding wire |
| CN102171375A (en) * | 2008-09-30 | 2011-08-31 | 日立金属株式会社 | Process for manufacturing Ni-base alloy and ni-base alloy |
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- 2012-08-16 CN CN2012102920165A patent/CN102806337A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1377690B1 (en) * | 2001-03-08 | 2008-01-09 | ATI Properties, Inc. | Method for producing large diameter ingots of nickel base alloys |
| CN1453388A (en) * | 2002-04-27 | 2003-11-05 | 艾默生电气（中国）投资有限公司 | Magnetic and heating treatment method to improve magnetically driven reversible strain property of polycrystalline Ni2 MnGa |
| CN1584067A (en) * | 2004-06-11 | 2005-02-23 | 宝钢集团上海五钢有限公司 | Process for OCr17Ni4Cu4N6 electroslag ingots by thermal transferring cogging |
| CN101486135A (en) * | 2008-01-18 | 2009-07-22 | 中国科学院金属研究所 | GH4169 high-temperature alloy welding wire |
| CN102171375A (en) * | 2008-09-30 | 2011-08-31 | 日立金属株式会社 | Process for manufacturing Ni-base alloy and ni-base alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114273643A (en) * | 2021-12-16 | 2022-04-05 | 舞阳钢铁有限责任公司 | Method for improving percent of pass of large single-weight high-alloy electroslag ingot |
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Application publication date: 20121205 |