CN102814488A - Casting method for high-nickel ductile iron pressure-bearing component of -41 to -75 DEG C low-temperature gas compression machine - Google Patents
Casting method for high-nickel ductile iron pressure-bearing component of -41 to -75 DEG C low-temperature gas compression machine Download PDFInfo
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- CN102814488A CN102814488A CN2012103437637A CN201210343763A CN102814488A CN 102814488 A CN102814488 A CN 102814488A CN 2012103437637 A CN2012103437637 A CN 2012103437637A CN 201210343763 A CN201210343763 A CN 201210343763A CN 102814488 A CN102814488 A CN 102814488A
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Abstract
The invention discloses a casting method for a high-nickel ductile iron pressure-bearing component of a -41 to -75 DEG C low-temperature gas compression machine. The casting method comprises the steps of molding and core making, smelting, balling before entering a furnace, inoculation before entering the furnace, pouring, damping down and mold dismantling, sand removal, clearing, polishing and shot blasting. Metal materials in the smelting step include the following materials in parts by weight: 40-45 parts of high-purity pig iron, 24-29 parts of scrap steel and 26-29 parts of electrolytic nickel; and the smelting process comprises the following steps of: adding 26-29 parts by weight of electrolytic nickel to the bottom of a medium-frequency induction furnace; putting the 40-45 parts by weight of high-purity pig iron in the furnace and electrifying the furnace to begin smelting; feeding the 24-29 parts by weight of scrap steel to the furnace when the furnace temperature is in a range fo 1320-1350 DEG C; when the temperature is up to a range of 1560-1580 DEG C, standing for 10 minutes and then purifying obtained metal melt. The high-nickel ductile iron pressure-bearing component cast by the casting method provided by the invention is capable of satisfying the use conditions of the -41 to -75 DEG C low-temperature gas compression machine.
Description
Technical field
The present invention relates to a kind of low temperature resistant magnesium iron casting method, specifically relate to the casting method of a kind of being applicable to-41 ℃ nickelic magnesium iron pressure-containing member of the cryogenic gas compressor mechanical of operating temperature between-75 ℃.
Background technology
The intake air temperature of cryogenic gas compressor mechanical pressure-containing member is-75 ℃, and delivery temperature is-41 ℃ to-48 ℃, and the suction and discharge pressure limit requires pressure-containing member that very high impact flexibility is arranged under-75 ℃ worst cold case between 0.2 ~ 1.6MPa.Material requirements to the gas pressure-bearing parts is special; How to make it can in the harsh climate environment, have good low-temperature resistance brittle failure property, corrosion resistance, higher percentage elongation, pressure-bearing property; Having very little linear expansion coefficient and very high low-temperature impact toughness simultaneously, is the key that cryogenic gas compressor mechanical pressure-containing member is made.
Existing gas at normal temperature compressor mechanical parts material mainly is casting pig, alloy cast iron and common spheroidal graphite cast-iron, owing in the defective of aspects such as anti-oxidant, low temperature resistant brittle failure property, can't satisfy the applying working condition of cryogenic gas compressor mechanical.
Summary of the invention
The technical problem that the present invention will solve provides the casting method of the nickelic magnesium iron pressure-containing member of a kind of being used for-41 ℃～-75 ℃ of cryogenic gas compressor mechanicals, uses the nickelic magnesium iron pressure-containing member of casting method casting of the present invention can satisfy the applying working condition of-41 ℃～-75 ℃ of cryogenic gas compressor mechanicals.
For solving the problems of the technologies described above, the casting method that the present invention is used for the nickelic magnesium iron pressure-containing member of-41 ℃～-75 ℃ of cryogenic gas compressor mechanicals may further comprise the steps:
With the shape of said pressure-containing member, the step of the corresponding molding and core making of structure;
To casting said pressure-containing member carries out melting with metal material step;
Gained molten metal after the melting is carried out the step that stokehold nodularization, stokehold are bred;
Breed the molten metal step of behind molding and core making, pouring into a mould in the gained sand mold of back gained to stokehold nodularization, stokehold, the cast step comprises the step of current-following inoculation and instant inoculation;
Pressure-containing member after the cast is carried out the step of banking fire shake out;
The gained pressure-containing member is carried out the step of desanding, cleaning, polishing and ball blast;
Saidly use the metal material in the step of metal material melting to be high-purity pig iron, steel scrap and electrolytic nickel to casting said pressure-containing member; Weight portion is respectively 40～45 parts, 24～29 parts and 26～29 parts; Content≤0.02% (percentage by weight) of content≤0.04% (percentage by weight) of content≤0.08% (percentage by weight) of content≤1.0% (percentage by weight) of the content of C>=4.1% (percentage by weight), Si, Mn, P, S in the said high-purity pig iron; The content of the content of C≤0.040% (percentage by weight), Si is that the content of (0.034 ~ 0.036) % (percentage by weight), Mn is content≤0.02% (percentage by weight) of (0.11 ~ 0.13) % (percentage by weight), P, content≤0.01% (percentage by weight) of S in the said steel scrap; The content of nickel and cobalt>=99.96% (percentage by weight) in the said electrolytic nickel, the wherein content of cobalt≤0.02% (percentage by weight); The equipment that said melting is adopted is medium-frequency induction furnace; Fusion process comprises that elder generation is added to the medium-frequency induction furnace furnace bottom to the electrolytic nickel of 26～29 weight portions; Put into the high-purity pig iron energising melting of 40～45 weight portions again; Drop into 24～29 weight portion steel scraps when furnace temperature reaches 1320 ~ 1350 ℃, when being warming up to 1560 ~ 1580 ℃, leaving standstill and purified the gained molten metal in 10 minutes; The nodulizer of selecting for use in the step that breed the nodularization of said stokehold, stokehold is the magnesium-rare earth nodulizer; The granularity of this magnesium-rare earth nodulizer is 5 ~ 25; Bag end addition is 1.6 ~ 1.8 weight portions; The inovulant of selecting for use is a silicon strontium inovulant, and the granularity of silicon strontium inovulant is 10 ~ 20, and bag end addition is 0.1 ~ 0.3 weight portion; The inovulant of selecting for use in current-following inoculation in the said cast step and the instant inoculation step also is silicon strontium inovulant, and current-following inoculation silicon strontium innoculant adding quantity is 0.6 ~ 0.9 weight portion, and instant inoculation silicon strontium innoculant adding quantity is 0.1 ~ 0.15 weight portion.
Adopt the nickelic magnesium iron pressure-containing member superior performance that is used for-41 ℃～-75 ℃ of cryogenic gas compressor mechanicals of casting method casting of the present invention, following through detecting each item performance indications:
The specific embodiment
The casting method that the present invention is used for the nickelic magnesium iron pressure-containing member of-41 ℃～-75 ℃ of cryogenic gas compressor mechanicals may further comprise the steps:
With the shape of said pressure-containing member, the step of the corresponding molding and core making of structure.
Select for use the furan resin self curing sand of silicon content more than 95% to fill type, coremaking is selected for use chromite sand 60%, high-purity technical to stir with carborundum 40% and furane resins and is formed, and places the ventilative rope of nylon in position; Place with the type chill twice zircon flour coating of sand mold external coating, coating layer thickness 0.8 ~ 1.1mm at heat energy-saving position; At end face corresponding riser runner is set according to magnesium iron graphitization reexpansion feeding principle; The dimension scale of running gate system sprue, cross gate, ingate is 6:9:4, and whether drill each dimension scale of case check suitable, adds the mould assembling of joint sealing mud bar, clamping after qualified; Lay the dirty plate of band retaining, the stifled cup in the mouth of a river; Lay secondary current-following inoculation funnel, put into the inovulant of corresponding proportion, waiting for pouring.
To casting said pressure-containing member carries out melting with metal material step;
Gained molten metal after the melting is carried out the step that stokehold nodularization, stokehold are bred;
Breed the molten metal step of behind molding and core making, pouring into a mould in the gained sand mold of back gained to stokehold nodularization, stokehold, the cast step comprises the step of current-following inoculation and instant inoculation;
Special-purpose magnesium iron bag is adopted in cast, presses the bag method to be: add nodulizer, inovulant earlier, add special-purpose magnesium iron bits again and cover tamping; Adopt pit to pour method; Go out 60% molten iron earlier, go out 40% molten iron after question response finishes again and carry out the secondary stokehold and breed, beat dirty, pouring temperature is controlled between 1470 ~ 1490 ℃; Do current-following inoculation during cast, the bleed of igniting.
Pressure-containing member after the cast is carried out the step of banking fire shake out.
Pressure-containing member banking fire below 3 tons was unpacked in 48 hours, and 3.5 ~ 7 tons pressure-containing member banking fire was unpacked in 72 hours, and the pressure-containing member banking fire more than 7 tons was unpacked in 96 hours.
The gained pressure-containing member is carried out the step of desanding, cleaning, polishing and ball blast;
Saidly use the metal material in the step of metal material melting to be high-purity pig iron, steel scrap and electrolytic nickel to casting said pressure-containing member; Weight portion is respectively 40～45 parts, 24～29 parts and 26～29 parts; Content≤0.02% (percentage by weight) of content≤0.04% (percentage by weight) of content≤0.08% (percentage by weight) of content≤1.0% (percentage by weight) of the content of C>=4.1% (percentage by weight), Si, Mn, P, S in the said high-purity pig iron; The content of the content of C≤0.040% (percentage by weight), Si is that the content of (0.034 ~ 0.036) % (percentage by weight), Mn is content≤0.02% (percentage by weight) of (0.11 ~ 0.13) % (percentage by weight), P, content≤0.01% (percentage by weight) of S in the said steel scrap; The content of nickel and cobalt>=99.96% (percentage by weight) in the said electrolytic nickel, the wherein content of cobalt≤0.02% (percentage by weight); The equipment that said melting is adopted is medium-frequency induction furnace; Fusion process comprises that elder generation is added to the medium-frequency induction furnace furnace bottom to the electrolytic nickel of 26～29 weight portions; Put into the high-purity pig iron energising melting of 40～45 weight portions again; Drop into 24～29 weight portion steel scraps when furnace temperature reaches 1320 ~ 1350 ℃, when being warming up to 1560 ~ 1580 ℃, leaving standstill and purified the gained molten metal in 10 minutes; The nodulizer of selecting for use in the step that breed the nodularization of said stokehold, stokehold is the magnesium-rare earth nodulizer; The granularity of this magnesium-rare earth nodulizer is 5 ~ 25; Bag end addition is 1.6 ~ 1.8 weight portions; The inovulant of selecting for use is a silicon strontium inovulant, and the granularity of silicon strontium inovulant is 10 ~ 20, and bag end addition is 0.1 ~ 0.3 weight portion; The inovulant of selecting for use in current-following inoculation in the said cast step and the instant inoculation step also is silicon strontium inovulant, and current-following inoculation silicon strontium innoculant adding quantity is 0.6 ~ 0.9 weight portion, and instant inoculation silicon strontium innoculant adding quantity is 0.1 ~ 0.15 weight portion.
The nickelic magnesium iron pressure-containing member that is used for-41 ℃～-75 ℃ of cryogenic gas compressor mechanicals that adopts casting method of the present invention casting is through detecting, superior performance, and main performance index is following:
Claims (1)
1. casting method that is used for the nickelic magnesium iron pressure-containing member of-41 ℃～-75 ℃ of cryogenic gas compressor mechanicals may further comprise the steps:
With the shape of said pressure-containing member, the step of the corresponding molding and core making of structure;
To casting said pressure-containing member carries out melting with metal material step;
Gained molten metal after the melting is carried out the step that stokehold nodularization, stokehold are bred;
Breed the molten metal step of behind molding and core making, pouring into a mould in the gained sand mold of back gained to stokehold nodularization, stokehold, the cast step comprises the step of current-following inoculation and instant inoculation;
Pressure-containing member after the cast is carried out the step of banking fire shake out;
The gained pressure-containing member is carried out the step of desanding, cleaning, polishing and ball blast;
It is characterized in that: saidly use the metal material in the step of metal material melting to be high-purity pig iron, steel scrap and electrolytic nickel casting said pressure-containing member; Weight portion is respectively 40～45 parts, 24～29 parts and 26～29 parts; Content≤0.02% (percentage by weight) of content≤0.04% (percentage by weight) of content≤0.08% (percentage by weight) of content≤1.0% (percentage by weight) of the content of C>=4.1% (percentage by weight), Si, Mn, P, S in the said high-purity pig iron; The content of the content of C≤0.040% (percentage by weight), Si is that the content of (0.034 ~ 0.036) % (percentage by weight), Mn is content≤0.02% (percentage by weight) of (0.11 ~ 0.13) % (percentage by weight), P, content≤0.01% (percentage by weight) of S in the said steel scrap; The content of nickel and cobalt>=99.96% (percentage by weight) in the said electrolytic nickel, the wherein content of cobalt≤0.02% (percentage by weight); The equipment that said melting is adopted is medium-frequency induction furnace; Fusion process comprises that elder generation is added to the medium-frequency induction furnace furnace bottom to the electrolytic nickel of 26～29 weight portions; Put into the high-purity pig iron energising melting of 40～45 weight portions again; Drop into 24～29 weight portion steel scraps when furnace temperature reaches 1320 ~ 1350 ℃, when being warming up to 1560 ~ 1580 ℃, leaving standstill and purified the gained molten metal in 10 minutes; The nodulizer of selecting for use in the step that breed the nodularization of said stokehold, stokehold is the magnesium-rare earth nodulizer; The granularity of this magnesium-rare earth nodulizer is 5 ~ 25; Bag end addition is 1.6 ~ 1.8 weight portions; The inovulant of selecting for use is a silicon strontium inovulant, and the granularity of silicon strontium inovulant is 10 ~ 20, and bag end addition is 0.1 ~ 0.3 weight portion; The inovulant of selecting for use in current-following inoculation in the said cast step and the instant inoculation step also is silicon strontium inovulant, and current-following inoculation silicon strontium innoculant adding quantity is 0.6 ~ 0.9 weight portion, and instant inoculation silicon strontium innoculant adding quantity is 0.1 ~ 0.15 weight portion.
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Cited By (2)
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| CN103436772A (en) * | 2013-09-05 | 2013-12-11 | 常州华德机械有限公司 | Low-temperature tough ferrite nodular cast iron of 60 DEG C below zero and preparation method thereof |
| CN107387854A (en) * | 2017-07-14 | 2017-11-24 | 常熟市虞菱机械有限责任公司 | A kind of part of revolving valves manual driving device the operating mode suitable for lower temperature |
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Cited By (3)
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| CN107387854A (en) * | 2017-07-14 | 2017-11-24 | 常熟市虞菱机械有限责任公司 | A kind of part of revolving valves manual driving device the operating mode suitable for lower temperature |
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Application publication date: 20121212 |