CN106381453A - Cast steel part for nuclear power unit and production technology thereof - Google Patents
Cast steel part for nuclear power unit and production technology thereof Download PDFInfo
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- CN106381453A CN106381453A CN201610840947.2A CN201610840947A CN106381453A CN 106381453 A CN106381453 A CN 106381453A CN 201610840947 A CN201610840947 A CN 201610840947A CN 106381453 A CN106381453 A CN 106381453A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a zero-defect high-quality cast steel part for nuclear power. The cast steel part is characterized in that the cast steel part is chemically composed of, by weight, 0.18% to 0.20% of C, less than or equal to 0.60% of Si, 0.60% to 0.80% of Mn, less than or equal to 0.02% of P, less than or equal to 0.015% of S, 1.35% to 1.50% of Cr, less than or equal to 0.50% of Ni, 0.90% to 1.10% of Mo, 0.20% to 0.30% of V, less than or equal to 0.025% of Sn, 0.08% to 0.12% of Zr, the balance Fe and unavoidable trace impurities. The invention further discloses a technology used for producing the cast steel part, and according to the technology, the cast steel part has no defects, is high in quality, and is good in abrasion resistance and corrosion resistance, and high in toughness when in the high-temperature environment, and therefore, the cast steel part is suitable for a nuclear power unit.
Description
Technical field
The present invention relates to a kind of cast steel parts and its production technology, specifically one seed nucleus zero-fault high-quality
Cast steel parts and its production technology.
Background technology
Core cast steel parts, are to be applied to nuclear armament key position, because other techniques technical cannot make or makes
Make high cost, the core parts making as desired by casting.Nuclear armament is high-end equipment, due to running environment side
Face, the needs of secure context and durable aspect, lead to some performances to cast steel parts and quality to have higher requirement.Except
Meet outside conventional mechanical property requirements, often reach 500 DEG C of high temperature above under running due to it, it requires and also will at high temperature
There is good performance.
Described cast steel parts（As：Cylinder, semi-ring foundry goods etc.）It is the vitals of nuclear power generating sets, its direct shadow of quality
Ring the running of nuclear power generating sets.Because the build of cast steel parts is relatively large, complex structure, casting thermal center is big and disperses, and leads to
Casting Technology Design is difficult；Further, since the use environment of nuclear power generating sets is special, the material requirements to cast steel parts is higher.
At present, the domestic production for cast steel parts has some limitations, and the tensile strength of its product and yield strength are relatively low,
Corrosion resistance, wearability are also poor, and the low technology that can not meet advanced core foundry goods abroad of yield strength under the high temperature conditions
Require.Casting quality quality is not high to cause its service life short, and easily causes potential safety hazard.
Content of the invention
The invention provides seed nucleus cast steel parts and its production technology, its object is to solve cast steel parts power
Poor performance, the problem that product quality is not high, production difficulty is big.
A kind of cast steel parts for nuclear power generating sets it is characterised in that：The weight hundred of this cast steel parts chemical composition
Point ratio is：C:0.18～0.20%, Si≤0.60%, Mn:0.60～0.80%, P≤0.02%, S≤0.015%, Cr:1.35～
1.50%, Ni≤0.50%, Mo:0.90～1.10%, V:0.20～0.30%, Sn≤0.025%, Zr：0.08～0.12%, remaining is
Fe and inevitable trace impurity.
Further, described cast steel parts are cylinder or semi-ring foundry goods.
A kind of production technology of the cast steel parts producing described in claim 1, its step is as follows：
（1）The low-carbon (LC) punching briquetting of steel cuttings, rustless stain is melted by heating by electric cooker, forms the molten steel of molten condition；
（2）Molten steel is sent into oxygen top-blown converter, Si, Mn, P, S, C, Ni and Cr in oxidation removal molten steel obtain low impurity steel
Water；
（3）By low impurity steel water with carrying out Refining in AOD refining furnace；
（4）Ferrosilicon, electrolytic manganese, low-carbon ferrochromium and metal zirconium is added to carry out melting in the molten steel after refining；
（5）The foundry returns adding the same trade mark after cleaning carries out melting, after molten steel melting, takes molten steel sample to carry out chemistry one-tenth
Part analysis；
（6）For analysis gained chemical analysis, add the alloy material being baked to 240～260 DEG C, composition is carried out to molten steel and carries out
Fine setting is so as to mass percent ratio requirement can be met；
（7）Furnace temperature is risen to after 1640～1650 DEG C, carries out two step deoxidations；Treat that electric furnace carries out electromagnetic agitation 4～5 minutes
Afterwards, insertion apparatus for determination of oxygen probe, in measurement molten steel, whether oxygen content PPM value, in setting, comes out of the stove after the assay was approved；
（8）With ladle dryer baking ladle to 900 DEG C～1000 DEG C, inclusion is aglow；
（9）Nickel plate, molybdenum-iron, cathode copper and vanadium iron are broken into fritter, after drying, are placed in ladle bottom, then deoxidier is placed in steel
Bag bottom, is processed with pouring method in bag molten steel being carried out with compound modification treatment and final deoxidizing；
（10）Molten steel is carried out with Argon process, Argon pressure >=0.15MPa, argon blowing time >=15 minute, and uses apparatus for determination of oxygen again
Steel water oxygen level is measured；
（11）Send in vacuum tank after molten steel is heated and carry out vacuum outgas deoxidation；
（12）With sand casting cast steel parts, before sand mold cast, carry out flow coat and drying.System is poured into a mould using open symmetric form
System is poured into a mould, and pouring temperature is 1555～1565 DEG C；
（13）After cast, foundry goods is unpacked after solidifying insulation in sandbox 72～84 hours, and air cooling cast steel parts are to 200～250 DEG C
Hereinafter, gas flame cuttiug dead head, cleaning undesirable root, overlap, burr etc.；
（14）Cast steel parts are quenched at 950～1050 DEG C, 80 DEG C of heating rate～100 DEG C/H, and temperature retention time is 3～8
Hour.Hardening immediately after coming out of the stove, hardening enters water time 45～70S, is again heated to 200～250 DEG C of tempering, insulation, along with the furnace cooling
Carry out air cooling to after 150 DEG C.
Further, step（5）Described in Chemical bath deposition be molten steel sample to be carried out with portable spectrometer in stokehold
Chemical analysis is quickly analyzed.
Further, step（7）Described in two step deoxidations be to be initially charged fine aluminium deoxidation and carry out first step deoxidation, then plus
Enter siliceous, calcium, barium and the double deoxidizer of aluminium carries out second step deoxidation.
Further, step（8）Middle infrared temperature-measuring gun measures ladle medium position temperature, and inclusion is aglow.
Further, step（9）Described in deoxidier be calcium, silicon, manganese double deoxidizer.
Further, step（12）Middle flow coater carries out coating flow coat sand mold to sand mold.With industrial hot blast before mould assembling
Machine toasts to sand mold.
Further, step（14）Described in enter the water time be to open heat-treatment furnace and make foundry goods be exposed in foundry goods to play casting
Part is completely into till in water.The water of wherein hardening institute millpond is necessary for recirculated water it is ensured that water temperature is less than 38 DEG C all the time.
The present invention controls the consumption of Cr 1.35～1.5%, so that intensity, hardness, quenching degree and the wearability of steel is significantly carried
Height, can improve non-oxidizability and the corrosion resistance of steel simultaneously again.With the addition of the elements such as Mo, Ni, V, Sn, Zr to be used in Steel material
Manufacture cast steel parts, greatly improve the mechanical property of cast steel parts so as to there is higher tensile strength and surrendering strong
Degree, larger ballistic work and hardness, make cast steel parts show good service behaviour and service life in nuclear power generating sets,
Greatly reduce the cost of maintenance, meanwhile, make cast steel parts possess larger elongation percentage and the contraction percentage of area it is ensured that cast steel zero
The use safety of part.Wherein Mo promotes the formation of ferrite and bainite, improves the obdurability of foundry goods；Improve micro- simultaneously
Solid solubility in austenite for the alloying element V, delays the Precipitation of microalloy carbonitride, and more V will be made to be protected
It is left to and separates out from ferrite under lower temperature, produce bigger precipitation enhancement, the heat endurance containing Mo carbonitride is relatively
Good it is ensured that high-temperature behavior；And V can thinning microstructure crystal grain, improve intensity and toughness, the carbide that V is formed with carbon, in HTHP
Under can improve hydrogen attack resistance；Ni forms tiny carbide and nitride in steel, prevents tissue in heating process again
Coarse grains, stop the roughening of welding heat affected zone crystal grain in welding process；Zr as metallurgical industry " vitamin " not only
Have stronger deoxidation, denitrogenate, desulfuration, and can significantly lift hardness and the intensity of steel, simultaneously part Zr with Sn,
Cr, Ni can improve the thermal conductivity of intensity, corrosion resistance and the Corrosion Resistant Film of material under interacting, reduce surface state quick to corrosion
Perception.
In order to produce above-mentioned cast steel parts, present invention also offers the production technology after a kind of improvement, using this production
Technique can produce the large volume cast steel parts of high-quality, for having stronger toughness and longer making in nuclear power generating sets
Use the life-span.There is this production technology compared with traditional cast steel parts production technology, there is advantages below：（1）Using steel cuttings,
The low-carbon (LC) punching briquetting of rustless stain and certain proportion with the trade mark foundry returns as raw material, on the premise of ensureing product quality
Greatly reduce production cost, rationally make use of waste resource, energy-conserving and environment-protective.（2）First pass through oxygen top blown before liquid steel refining to turn
Stove carries out aoxidizing impurity elimination, prevents the impurity contents such as Si, Mn, P, S, C, Ni and Cr in molten steel too high, convenient after to molten steel
The fine setting of composition.（3）Using AOD refining furnace, molten steel being refined, so that the impurity such as P, S in firm water is reduced, thus lifting molten steel
Degree of purity.（4）Carry out stokehold fast component analysis and Determination of octafluoropropane content, property to ensure product up to standard in the molten steel come out of the stove
Energy.（5）Argon is carried out to ladle bottom, impurity is taken out of with argon gas rolling, so that molten steel is purer.（6）Carry out four times to take off
Oxygen is processed, and makes the abundant deoxidation of molten steel, thus improving product performance.（7）Molten steel Argon is sent in vacuum tank after processing and is de-gassed
Deoxidation, not only further deoxidation improving product performance, and molten steel can be purified further, reduce nonmetallic miscellaneous to greatest extent
Matter.（8）Ferromanganese is replaced to add in molten steel using electrolytic manganese, to improve the purity of manganese, thus lifting the mechanical property of cast steel parts
Can, improve product quality.（9）Ladle needs to first pass through high-temperature baking, makes inclusion aglow, to ensure liquid steel temperature abundant enough
Without being made due to due to cold ladle, liquid steel temperature is too fast to be declined it is ensured that molten steel has suitable pouring temperature.（10）Cast
Before, with flow coater, sand mold is carried out with coating flow coat, obtains sand mold exquisiteness surface it is ensured that cast product surface quality, improve work
Efficiency.With industrial air heater, sand mold is toasted, it is to avoid the sand mold moisture absorption and the product air holes defect that leads to, reduce cold mould to steel flow
The impact of dynamic property, thus greatly reduce defect rate；（11）Employ full open model symmetric form running gate system and carry out zero, cast steel
The casting of part, fills type steadily, little to die cavity scouring force, reduces because of volume gas, the product casting flaw caused by slag turbulent flow.
In sum, the present invention strictly controls the consumption of Cr, with the addition of the elements such as Ni, Mo, Sn, Zr, V in Steel material,
Make described cast steel parts have preferable wearability, corrosion resistance, heat resistance and stronger toughness, reach external elder generation
Enter the technical indicator of core foundry goods.
Specific embodiment
Below in conjunction with specific embodiment, the present invention will be further elaborated.
Embodiment one
A kind of cast steel parts for nuclear power generating sets, the step of its production technology is as follows：
（1）The low-carbon (LC) punching briquetting of steel cuttings, rustless stain is melted by heating by electric cooker, forms the molten steel of molten condition.
（2）Molten steel is sent into oxygen top-blown converter, Si, Mn, P, S, C, Ni and the Cr in oxidation removal molten steel obtains low miscellaneous
Matter molten steel.
（3）By low impurity steel water with carrying out Refining in AOD refining furnace.
（4）Ferrosilicon, electrolytic manganese, low-carbon ferrochromium and metal zirconium is added to carry out melting in the molten steel after refining.
（5）The foundry returns adding the same trade mark after cleaning carries out melting, after molten steel melting, takes molten steel sample
Learn analysis of components, be to carry out chemical analysis with portable spectrometer to molten steel sample in stokehold quickly to analyze.
（6）For analysis gained chemical analysis, add the alloy material being baked to 220 DEG C, composition is carried out to molten steel and carries out
Fine setting is so as to mass percent ratio requirement can be met.
（7）Furnace temperature is risen to after 1635 DEG C, carries out two step deoxidations, be initially charged fine aluminium deoxidation and carry out first step deoxidation,
Siliceous, calcium, barium and the double deoxidizer of aluminium is then added to carry out second step deoxidation；Treat that electric furnace carries out electromagnetic agitation 4～5 minutes
Afterwards, insertion apparatus for determination of oxygen probe, oxygen content PPM value position 4.8PPM in measurement molten steel, meet≤the requirement of 5PPM, come out of the stove.
（8）Toast ladle with ladle dryer, infrared temperature-measuring gun records ladle middle portion temperature and reaches 938 DEG C, and visual inclusion is aglow.
（9）The material fragmentations such as nickel plate, molybdenum-iron, cathode copper and vanadium iron are become fritter, after drying, is placed in ladle bottom, then will
Calcium, silicon, manganese double deoxidizer are placed in Ladle Bottom, are processed with pouring method in bag molten steel being carried out with compound modification treatment and final deoxidizing.
（10）Molten steel is carried out with Argon process, Argon pressure 0.18MPa, argon blowing time 16 minutes, and uses apparatus for determination of oxygen again
Steel water oxygen level is measured for 4.5PPM, meets≤the requirement of 5PPM.
（11）Molten steel heating after processing through Argon is sent in vacuum tank and is carried out vacuum outgas deoxidation, vacuum outgas deoxidation
Time is 30 minutes, and vacuum is 0.5Mbar.
（12）With sand casting cast steel parts, carry out flow coat before sand mold cast, air-heater air cooking sand mold before mould assembling
4H.Poured into a mould using open symmetric form running gate system, pouring temperature is 1556 DEG C.
（13）After cast foundry goods solidify in sandbox insulation 72 hours after unpack, air cooling cast steel parts to 230 DEG C about,
Gas flame cuttiug dead head, cleaning undesirable root, overlap, burr etc..
（14）Cast steel parts are quenched at 1000 DEG C, 80 DEG C -100 DEG C/H of heating rate, and temperature retention time is 6 hours.
Hardening immediately after coming out of the stove, hardening enters water time 60S, is again heated to 200 DEG C of tempering, insulation, carries out sky after cooling to 150 DEG C with the furnace
Cold.Entering the water time is to open heat-treatment furnace to make foundry goods be exposed in foundry goods to play foundry goods completely into till in water.Wherein hardening
The water of institute's millpond is necessary for recirculated water it is ensured that water temperature is less than 38 DEG C all the time.
The chemical composition such as following table of the cast steel parts being obtained by above-mentioned production technology（Table 1）Shown：
A kind of chemical composition analysis table of the cast steel parts for nuclear power generating sets of table 1
Obtain the mechanical property such as following table of this cast steel parts by test（Table 2）Shown：
A kind of Mechanics Performance Testing table of the cast steel parts for nuclear power generating sets of table 2
Under 20 DEG C of experimental conditions of normal temperature
Under 500 DEG C of experimental conditions of high temperature
Yield strength：350MPa.
Met the requirements as following table by the casting quality that Non-Destructive Testing test obtains this cast steel parts（Table 3）Shown：
A kind of Non-Destructive Testing test table of cast steel parts for nuclear power generating sets of table 3
International core cast steel parts quality requirement is complied fully with Non-Destructive Testing result of improving quality.
Embodiment two
A kind of cast steel parts for nuclear power generating sets, the step of its production technology is as follows：
（1）The low-carbon (LC) punching briquetting of steel cuttings, rustless stain is melted by heating by electric cooker, forms the molten steel of molten condition.
（2）Molten steel is sent into oxygen top-blown converter, Si, Mn, P, S, C, Ni and the Cr in oxidation removal molten steel obtains low miscellaneous
Matter molten steel.
（3）By low impurity steel water with carrying out Refining in AOD refining furnace.
（4）Ferrosilicon, electrolytic manganese, low-carbon ferrochromium and metal zirconium is added to carry out melting in the molten steel after refining.
（5）The foundry returns adding the same trade mark after cleaning carries out melting, after molten steel melting, takes molten steel sample
Learn analysis of components, be to carry out chemical analysis with portable spectrometer to molten steel sample in stokehold quickly to analyze.
（6）For analysis gained chemical analysis, add the alloy material being baked to 210 DEG C, composition is carried out to molten steel and carries out
Fine setting is so as to mass percent ratio requirement can be met.
（7）Furnace temperature is risen to after 1628 DEG C, carries out two step deoxidations, be initially charged fine aluminium deoxidation and carry out first step deoxidation,
Siliceous, calcium, barium and the double deoxidizer of aluminium is then added to carry out second step deoxidation；Treat that electric furnace carries out electromagnetic agitation 4～5 minutes
Afterwards, insertion apparatus for determination of oxygen probe, oxygen content PPM value position 4.6PPM in measurement molten steel, meet≤the requirement of 5PPM, come out of the stove.
（8）Toast ladle with ladle dryer, infrared temperature-measuring gun records ladle middle portion temperature and reaches 956 DEG C, and visual inclusion is aglow.
（9）The material fragmentations such as nickel plate, molybdenum-iron, cathode copper and vanadium iron are become fritter, after drying, is placed in ladle bottom, then will
Calcium, silicon, manganese double deoxidizer are placed in Ladle Bottom, are processed with pouring method in bag molten steel being carried out with compound modification treatment and final deoxidizing.
（10）Molten steel is carried out with Argon process, Argon pressure 0.18MPa, argon blowing time 16 minutes, and uses apparatus for determination of oxygen again
Steel water oxygen level is measured for 4.42PPM, meets≤the requirement of 5PPM.
（11）Molten steel heating after processing through Argon is sent in vacuum tank and is carried out vacuum outgas deoxidation, vacuum outgas deoxidation
Time is 50 minutes, and vacuum is 0.9Mbar.
（12）With sand casting cast steel parts, carry out flow coat before sand mold cast, air-heater air cooking sand mold before mould assembling
4H.Poured into a mould using open symmetric form running gate system, pouring temperature is 1560 DEG C.
（13）After cast foundry goods solidify in sandbox insulation 84 hours after unpack, air cooling cast steel parts to 230 DEG C about,
Gas flame cuttiug dead head, cleaning undesirable root, overlap, burr etc..
（14）Cast steel parts are quenched at 1050 DEG C, 80 DEG C -100 DEG C/H of heating rate, and temperature retention time is little for 7.5
When.Hardening immediately after coming out of the stove, hardening enters water time 65S, is again heated to 250 DEG C of tempering, insulation, cool to the furnace 150 DEG C laggard
Row air cooling.Entering the water time is to open heat-treatment furnace to make foundry goods be exposed in foundry goods to play foundry goods completely into till in water.Wherein
The water of hardening institute millpond is necessary for recirculated water it is ensured that water temperature is less than 38 DEG C all the time.
The chemical composition such as following table of the cast steel parts being obtained by above-mentioned production technology（Table 4）Shown：
A kind of chemical composition analysis table of the cast steel parts for nuclear power generating sets of table 4
Obtain the mechanical property such as following table of this cast steel parts by test（Table 5）Shown：
A kind of Mechanics Performance Testing table of the cast steel parts for nuclear power generating sets of table 5
Under 20 DEG C of experimental conditions of normal temperature
Under 500 DEG C of experimental conditions of high temperature
Yield strength：368MPa
Met the requirements as following table by the casting quality that Non-Destructive Testing test obtains this cast steel parts（Table 6）Shown：
A kind of Non-Destructive Testing test table of cast steel parts for nuclear power generating sets of table 6
International core cast steel parts quality requirement is complied fully with Non-Destructive Testing result of improving quality.
The data of mechanical of comprehensive above example understand, by the debugging of the chemical composition to cast steel parts with
And the improving so that the cast steel parts produced have good tensile strength and yield strength of production technology, and have
Higher ballistic work, toughness and wearability；Meanwhile, the elongation percentage of cast steel parts and the contraction percentage of area are larger, and its plasticity is described
Preferably, it is not only convenient for carrying out various processing, and can guarantee that safe handling in nuclear power generating sets for the cast steel parts.
Described cast steel parts are cylinder, semi-ring foundry goods or other parts.
Above are only the specific embodiment of the present invention, but the design concept of the present invention is not limited thereto, all utilize this
Design carries out the change of unsubstantiality to the present invention, all should belong to the behavior invading the scope of the present invention.
Claims (9)
1. a kind of cast steel parts for nuclear power generating sets it is characterised in that：The weight percent of this cast steel parts chemical composition
Than for：C:0.18～0.20%, Si≤0.60%, Mn:0.60～0.80%, P≤0.02%, S≤0.015%, Cr:1.35～
1.50%, Ni≤0.50%, Mo:0.90～1.10%, V:0.20～0.30%, Sn≤0.025%, Zr：0.08～0.12%, remaining is
Fe and inevitable trace impurity.
2. a kind of cast steel parts for nuclear power generating sets according to claim 1 it is characterised in that：Described cast steel zero
Part is cylinder or semi-ring foundry goods.
3. a kind of production technology of the cast steel parts producing described in claim 1, its step is as follows：
（1）The low-carbon (LC) punching briquetting of steel cuttings, rustless stain is melted by heating by electric cooker, forms the molten steel of molten condition；
（2）Molten steel is sent into oxygen top-blown converter, Si, Mn, P, S, C, Ni and Cr in oxidation removal molten steel obtain low impurity steel
Water；
（3）By low impurity steel water with carrying out Refining in AOD refining furnace；
（4）Ferrosilicon, electrolytic manganese, low-carbon ferrochromium and metal zirconium is added to carry out melting in the molten steel after refining；
（5）The foundry returns adding the same trade mark after cleaning carries out melting, after molten steel melting, takes molten steel sample to carry out chemistry one-tenth
Part analysis；
（6）For analysis gained chemical analysis, add the alloy material being baked to 240～260 DEG C, composition is carried out to molten steel and carries out
Fine setting is so as to mass percent ratio requirement can be met；
（7）Furnace temperature is risen to after 1640～1650 DEG C, carries out two step deoxidations；Treat that electric furnace carries out electromagnetic agitation 4～5 minutes
Afterwards, insertion apparatus for determination of oxygen probe, in measurement molten steel, whether oxygen content PPM value, in setting, comes out of the stove after the assay was approved；
（8）With ladle dryer baking ladle to 900 DEG C～1000 DEG C, inclusion is aglow；
（9）Nickel plate, molybdenum-iron, cathode copper and vanadium iron are broken into fritter, after drying, are placed in ladle bottom, then deoxidier is placed in steel
Bag bottom, is processed with pouring method in bag molten steel being carried out with compound modification treatment and final deoxidizing；
（10）Molten steel is carried out with Argon process, Argon pressure >=0.15MPa, argon blowing time >=15 minute, and uses apparatus for determination of oxygen again
Steel water oxygen level is measured；
（11）Send in vacuum tank after molten steel is heated and carry out vacuum outgas deoxidation；
（12）With sand casting cast steel parts, before sand mold cast, carry out flow coat and drying；System is poured into a mould using open symmetric form
System is poured into a mould, and pouring temperature is 1555～1565 DEG C；
（13）After cast, foundry goods is unpacked after solidifying insulation in sandbox 72～84 hours, and air cooling cast steel parts are to 200～250 DEG C
Hereinafter, gas flame cuttiug dead head, cleaning undesirable root, overlap, burr etc.；
（14）Cast steel parts are quenched at 950～1050 DEG C, 80 DEG C of heating rate～100 DEG C/H, and temperature retention time is 3～8
Hour；Hardening immediately after coming out of the stove, hardening enters water time 45～70S, is again heated to 200～250 DEG C of tempering, insulation, along with the furnace cooling
Carry out air cooling to after 150 DEG C.
4. the cast steel parts according to claim 3 production technology it is characterised in that：Step（5）Described in chemistry
Analysis of components is to carry out chemical analysis with portable spectrometer to molten steel sample in stokehold quickly to analyze.
5. the cast steel parts according to claim 3 production technology it is characterised in that：Step（7）Described in two steps
Deoxidation is to be initially charged fine aluminium deoxidation and carry out first step deoxidation, then adds siliceous, calcium, barium and the double deoxidizer of aluminium to carry out
Two step deoxidations.
6. the cast steel parts according to claim 3 production technology it is characterised in that：Step（8）Middle use infrared survey
Warm rifle measures ladle medium position temperature, and inclusion is aglow.
7. the cast steel parts according to claim 3 production technology it is characterised in that：Step（9）Described in deoxidation
Agent is calcium, silicon, manganese double deoxidizer.
8. the cast steel parts according to claim 3 production technology it is characterised in that：Step（12）In use flow coater
Sand mold is carried out with coating flow coat sand mold, with industrial air heater, sand mold is toasted before mould assembling.
9. cast steel parts as claimed in claim 3 production technology it is characterised in that：Step（14）Described in enter the water time
Make foundry goods be exposed in foundry goods to play foundry goods completely into till in water for opening heat-treatment furnace；The water of wherein hardening institute millpond
It is necessary for recirculated water it is ensured that water temperature is less than 38 DEG C all the time.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108930002A (en) * | 2017-05-26 | 2018-12-04 | 宝山钢铁股份有限公司 | Hardness 500HB slurry dredges effective erosion resistant steel plate and its production method |
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| CN102741440A (en) * | 2010-05-31 | 2012-10-17 | 新日本制铁株式会社 | Steel material for quenching and method of producing same |
| CN104878311A (en) * | 2015-06-15 | 2015-09-02 | 三明市毅君机械铸造有限公司 | Cast steel part for ultra-supercritical thermal power generating unit and production process of cast steel part |
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| JP2001131698A (en) * | 1999-10-28 | 2001-05-15 | Sumitomo Metal Ind Ltd | Steel tube excellent in sulfide stress cracking resistance |
| CN101476085A (en) * | 2009-01-08 | 2009-07-08 | 辽宁福鞍铸业集团有限公司 | Method for foundry production of ultra-supercritical main steam control valve for nuclear power unit |
| CN102741440A (en) * | 2010-05-31 | 2012-10-17 | 新日本制铁株式会社 | Steel material for quenching and method of producing same |
| CN104878311A (en) * | 2015-06-15 | 2015-09-02 | 三明市毅君机械铸造有限公司 | Cast steel part for ultra-supercritical thermal power generating unit and production process of cast steel part |
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| CN108930002A (en) * | 2017-05-26 | 2018-12-04 | 宝山钢铁股份有限公司 | Hardness 500HB slurry dredges effective erosion resistant steel plate and its production method |
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