CN103820740B - A kind of ferrite heat-resistant cast steel and its preparation method and application - Google Patents
A kind of ferrite heat-resistant cast steel and its preparation method and application Download PDFInfo
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- CN103820740B CN103820740B CN201410072239.XA CN201410072239A CN103820740B CN 103820740 B CN103820740 B CN 103820740B CN 201410072239 A CN201410072239 A CN 201410072239A CN 103820740 B CN103820740 B CN 103820740B
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- 229910001208 Crucible steel Inorganic materials 0.000 title claims abstract description 102
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 87
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 80
- 239000010959 steel Substances 0.000 claims abstract description 80
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 38
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 30
- 239000000956 alloy Substances 0.000 claims abstract description 30
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 20
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 19
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 16
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 37
- 150000002910 rare earth metals Chemical class 0.000 claims description 33
- 239000004411 aluminium Substances 0.000 claims description 27
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 25
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 23
- 239000007788 liquid Substances 0.000 claims description 22
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 20
- 239000010955 niobium Substances 0.000 claims description 19
- 238000005266 casting Methods 0.000 claims description 18
- 239000011575 calcium Substances 0.000 claims description 16
- 229910052791 calcium Inorganic materials 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 11
- 229910052788 barium Inorganic materials 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 6
- 229910000600 Ba alloy Inorganic materials 0.000 claims description 5
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 5
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 5
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 5
- -1 aluminum silicon calcium Barium Chemical compound 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 5
- 239000010425 asbestos Substances 0.000 claims description 5
- 239000010882 bottom ash Substances 0.000 claims description 5
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 5
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052746 lanthanum Inorganic materials 0.000 claims description 5
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 5
- 229910052895 riebeckite Inorganic materials 0.000 claims description 5
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 230000003595 spectral effect Effects 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 15
- 230000003647 oxidation Effects 0.000 abstract description 14
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000002929 anti-fatigue Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 27
- 239000011651 chromium Substances 0.000 description 20
- 239000000463 material Substances 0.000 description 14
- 239000010813 municipal solid waste Substances 0.000 description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 11
- 239000011572 manganese Substances 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 239000000126 substance Substances 0.000 description 8
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 208000025599 Heat Stress disease Diseases 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000009661 fatigue test Methods 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 208000020442 loss of weight Diseases 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 201000001376 Familial Combined Hyperlipidemia Diseases 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000003026 anti-oxygenic effect Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a kind of ferrite heat-resistant cast steel and preparation method thereof, preparation method includes following steps：Alloy melting, go out molten steel, cast, heat treatment.The component and its mass percent of alloy be：C：0.10%~0.25%, Si：0.6%~1.5%, Mn：0.2%~0.6%, P：≤ 0.05%, S：0.03%~0.12%, Cr：12%~13.9%, Ni：0.8%~1.35%, N：0.01%~0.06%, Re:0.01%~0.1%, Nb：0.15%~3.0%, Al：0.01%~0.8%, balance of iron and inevitable impurity.Ferrite heat-resistant cast steel of the invention has preferable high-temperature oxidation resistance, high temperature anti-fatigue performance and preferable normal temperature toughness, and production cost is relatively low, is suitable for producing the parts of engine exhaust system.
Description
Technical field
It is especially a kind of for producing vapour the present invention relates to the production method and application of a kind of cast steel material and the cast steel
The heat-resisting spheroidal graphite steel of the gas extraction system parts such as exhaust manifold, volute, the disjunctor volute exhaust manifold of car engine.
Background technology
As the whole world is to the increasingly harsh of energy-saving and emission-reduction requirement, automobile engine energy-conserving and environment-protective will face challenge higher,
Need to meet tightened up requirement.Gas extraction system parts such as exhaust manifold as the key components and parts in automobile engine,
Its quality directly influences the service life and discharge performance of engine.At present, domestic and international high-end automobile production producer
Engine in order to meet automotive energy-saving emission-reducing requirement, delivery temperature needs to reach more than 800 DEG C, could so reduce nitrogen oxidation
The discharge capacity of compound, carbon dioxide, so as to reach the discharge standard in Europe IV, Europe V.
Conventional cast iron materials are difficult to reach use requirement so high, New-type cast steel material as a kind of special substance,
Its heat resistance, fatigue durability, corrosion resistance are significantly larger than cast iron, the need for meeting use.But austenitic heat resistant cast steel by
In higher containing the noble metal production cost such as more chromium, nickel.In order to improve product competitiveness and Business Economic Benefit, while full
Sufficient client to the quality requirement of heat resisting cast steel, in the urgent need to developing a kind of heat resisting cast steel material of new high-performance and low-cost.
Chinese patent literature CN102301029 discloses a kind of ferrite heat-resistant cast steel and exhaust system component, iron element
The ferritic structure that body heat resisting cast steel has includes carbon 0.10~0.40%, silicon 0.5~2.0%, manganese 0.2 by percentage to the quality
~1.2%, phosphorus below 0.3%, sulphur 0.01~0.4%, chromium 14.0%~21.0%, niobium 0.05~0.6%, aluminium 0.01~0.8%, nickel
0.15~2.3%, and surplus iron and inevitable impurity.The cast steel material chromium, aluminium, manganese content it is higher, and add one
Fixed vanadium, the unstable elongation of mechanical property is smaller.Chinese patent literature CN102822370 discloses a kind of normal temperature tenacity excellent
Ferrite heat resisting cast steel and the exhaust system part that is made up of it, the carbon of the ferrite heat-resistant cast steel, niobium, chromium content compared with
It is high.Chinese patent literature CN1032680 discloses a kind of rare earth, high-chromium ferritic heat-resistant steel, the ferrite heat resisting cast steel
Carbon, rare earth, chromium content it is higher.
The content of the invention
It is an object of the invention to provide one kind have preferable high-temperature oxidation resistance, high temperature anti-fatigue performance and preferably
Normal temperature toughness, and the relatively low ferrite heat-resistant cast steel of production cost and ferrite heat-resistant cast steel preparation method and application.
The technical scheme for realizing the object of the invention is a kind of ferrite heat-resistant cast steel, the component and its mass percent of alloy
For：C：0.10%~0.25%, Si：0.6%~1.5%, Mn：0.2%~0.6%, P：≤ 0.05%, S：0.03%~0.12%, Cr：12%
~13.9%, Ni：0.8%~1.35%, N：0.01%~0.06%, Re:0.01%~0.1%, Nb：0.15%~3.0%, Al：0.01%
~0.8%, balance of iron and inevitable impurity.
One kind of above-mentioned technical proposal is preferably：The mass percentage content of above-mentioned Cr is 12.5%~13.9%.
One kind of above-mentioned technical proposal is preferably：The mass percentage content of above-mentioned Si is 0.8%~1.2%.
One kind of above-mentioned technical proposal is preferably：The mass percentage content of above-mentioned Mn is 0.4%~0.5%.
One kind of above-mentioned technical proposal is preferably：The mass percentage content of above-mentioned Al is 0.01%~0.15%.
One kind of above-mentioned technical proposal is preferably：The mass percentage content 0.61%~3.0% of above-mentioned Nb.
One kind of above-mentioned technical proposal is preferably：The mass percentage content 0.61%~2.0% of above-mentioned Nb.
One kind of above-mentioned technical proposal is preferably：The mass percentage content 0.61%~1.0% of above-mentioned Nb.
The technical scheme for realizing the object of the invention is a kind of preparation method of ferrite heat-resistant cast steel, is comprised the following steps：
A. alloy melting：Component and content according to alloy carry out dispensing, first load in stove bottom ash, then by carburetting
Agent, steel scrap, nickel plate, ferrochrome, ferro-niobium load in alkaline induction furnace, skimmed after all molten steel is melt into, make new slag, work as liquid steel temperature
Ferromanganese, ferrosilicon are added when rising to 1530 DEG C~1550 DEG C carries out pre-deoxidation, and molten steel insulation simultaneously quickly carries out spectral component analysis, connects
And heat up and add sulphur iron, when liquid steel temperature is higher than 1600 DEG C, add silico-calcium deoxidier to carry out secondary deoxidation, work as liquid steel temperature
Aluminium deoxidizer is added during higher than 1650 DEG C carries out final deoxidizing；
B. molten steel is gone out：Rare earth ferrosilicon and aluminium block are put into ladle, liquid steel temperature goes out rapidly molten steel when reaching 1650 DEG C；
C. pour into a mould：To use asbestos pushing off the slag in pouring molten steel to casting mold, in casting process, cast treated after terminating casting mold cooling,
Unpacking cleaning obtains blank；
D. it is heat-treated：By the temperature control of blank at 850 DEG C~1000 DEG C, 1h~3h is incubated, then cools to 500 with the furnace
DEG C, then 1h~3h is incubated, come out of the stove air cooling or furnace cooling.One kind of above-mentioned technical proposal is preferably：In above-mentioned steps B, going out
By in rare earth ferrosilicon and aluminium block input steel flow while molten steel.The recovery rate of rare earth ferrosilicon and aluminium can be improved and keep receiving
The stabilization of rate, prevents rare earth and aluminium from being wrapped up by slag, it is impossible to fully acted on molten steel.
One kind of above-mentioned technical proposal is preferably：In above-mentioned steps D, by the temperature control of blank at 980 DEG C~1000 DEG C.
By the temperature control of blank more than 980 DEG C, the initial temperature for improving heat treatment is conducive to austenitizing more abundant and refinement
Even grained.
One kind of above-mentioned technical proposal is preferably：Above-mentioned silico-calcium deoxidier is low aluminum silicon calcium barium alloy.
One kind of above-mentioned technical proposal is preferably：Above-mentioned aluminium deoxidizer is fine aluminium.
One kind of above-mentioned technical proposal is preferably：The alloy compositions and its mass percent of above-mentioned rare earth ferrosilicon are：Re:
20%~25%, Ca:2%~3%, Ba:3%~4%, Si:45%~55%, Mg:0.05%, remaining is iron.
One kind of above-mentioned technical proposal is preferably：Rare earth element in above-mentioned rare earth ferrosilicon includes Ce elements and lanthanum element,
Mass ratio >=4 of the mass percentage content ＞ 20% of Ce elements in the rare earth ferrosilicon, Ce elements and lanthanum element.
The application of above-mentioned ferrite heat-resistant cast steel is the parts for manufacturing engine exhaust system, for example, be vented discrimination
Pipe, volute, disjunctor volute exhaust manifold etc..
The present invention has positive effect：
（1）The present invention is optimized to the alloying component of ferrite heat-resistant cast steel, by reasonably reducing chromium, manganese and nickel
Addition, control carbon, silicon, the content of the element such as sulphur increase a small amount of rare earth, niobium and aluminium, improve ferrite heat-resistant cast steel
Thermal fatigue property and high-temperature oxidation resistance.Reach sample（φ10mm×20mm）In 850 DEG C of atmospheric environments, 200h is incubated,
Oxidation loss of weight is ＜ 3.2mg/cm2, oxidation rate ＜ 0.16g/m2·h；The heat fatigue cycle-index of normal temperature to 850 DEG C is more than
1200 times flawless occurs, and compares austenite heat-resistance stainless steel（DIN1.4826）High-temperature oxidation resistance more preferably or quite.
（2）Rare earth used of the invention is rare earth ferrosilicon alloy, and the content of Ce elements is about containing for lanthanum element in rare earth ferrosilicon
4 times of amount, and the content of Ce elements is more than 20% in rare earth ferrosilicon, the rare earth ferrosilicon contains a small amount of calcium, barium element simultaneously, can
Effectively cleaning molten steel, substantially reduce the oxygen content in molten steel, while improve oxide skin structure, make oxide skin become cause
Close, in the use environment of cold cycling, oxide skin is difficult for drop-off, so as to the thermal fatigue property and high temperature that substantially increase steel resist
Oxidisability.Meanwhile, rare earth has the form for changing steel inclusion, i.e. rare earth is conducive to I type and III type field trash to be formed, and eliminates
II type familial combined hyperlipidemia field trash, is favorably improved the combination property of material, influence of the rare earth to inclusion morphology such as Figure 25 and Figure 26
It is shown.Ferrite heat-resistant cast steel of the invention in process of production by controlling contact of the molten steel with air, by containing for nitrogen
Amount control is between 0.01%~0.06%.Nitrogen is in molten steel, although be strong austenizer, but a small amount of nitrogen
Can crystal grain thinning, raising elevated temperature strength, the hot-short tendency of reduction.
（3）In the chemical composition of ferrite heat-resistant cast steel of the invention, appropriate niobium element can form the niobium carbonization of stabilization
Thing, crystal grain thinning greatly increases elevated temperature strength.Chromium, rare earth, niobium, the combination of nitrogen can effectively play the effect of each element, only
Change molten steel, crystal grain thinning, improve high temperature oxidative resistance, elevated temperature strength, cool-hot fatigue and reduce fragility.
（4）In the chemical composition of ferrite heat-resistant cast steel of the invention, the content of chromium is controlled below 13.9%（It is preferred that
Between 12.5%~13.9%）, material after Overheating Treatment metallographic structure by two phase compositions, first mutually for white pure iron element
Body, second is mutually the compound phase that the ferrite of white is constituted with black particle shape carbide, wherein the area occupation ratio of the first phase is less than
40%, the optimal area occupation ratio of the first phase is 10~30%.The more chromium of solid solution in first phase ferrite, second by delta ferrite+small
Granular carbide is constituted, and the grain boundaries of two-phase are dispersed with the carbide of small chromium and the carbide of niobium, in hot environment
It is difficult to turn into the starting point being cracked, so as to be favorably improved tensile strength, percentage of elongation and thermal fatigue strength and high-temperature oxidation resistance.
（5）Ferrite heat-resistant cast steel room temperature tensile strength >=600MPa of the invention, yield strength >=400MPa, elongation
≥4%.The material yield tensile ratio is high, more than 0.6, represents that the plasticity of material is excellent, and the non-deformability of material is stronger, is not susceptible to
Plastic deformation；Meanwhile, the material is also equipped with certain elongation（≥4%）, illustrate the toughness of material preferably, being difficult brittle failure has
Preferable processing characteristics, the parts of the Engine Exhaust Emission system being made up of the ferrite heat-resistant cast steel can at 900 DEG C and
Used in above tail gas environment.
Brief description of the drawings
The present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 for embodiment 1 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Fig. 2 be the ferrite heat-resistant cast steel of embodiment 1 metallographic structure amplify 500 times when picture.
Fig. 3 for embodiment 2 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Fig. 4 be the ferrite heat-resistant cast steel of embodiment 2 metallographic structure amplify 500 times when picture.
Fig. 5 for embodiment 3 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Fig. 6 be the ferrite heat-resistant cast steel of embodiment 3 metallographic structure amplify 500 times when picture.
Fig. 7 for embodiment 4 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Fig. 8 be the ferrite heat-resistant cast steel of embodiment 4 metallographic structure amplify 500 times when picture.
Fig. 9 for embodiment 5 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Figure 10 be the ferrite heat-resistant cast steel of embodiment 5 metallographic structure amplify 500 times when picture.
Figure 11 for embodiment 6 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Figure 12 be the ferrite heat-resistant cast steel of embodiment 6 metallographic structure amplify 500 times when picture.
Figure 13 for embodiment 7 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Figure 14 be the ferrite heat-resistant cast steel of embodiment 7 metallographic structure amplify 500 times when picture.
Figure 15 for embodiment 8 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Figure 16 be the ferrite heat-resistant cast steel of embodiment 8 metallographic structure amplify 500 times when picture.
Figure 17 for embodiment 9 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Figure 18 be the ferrite heat-resistant cast steel of embodiment 9 metallographic structure amplify 500 times when picture.
Figure 19 for embodiment 10 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Figure 20 be the ferrite heat-resistant cast steel of embodiment 10 metallographic structure amplify 500 times when picture.
Figure 21 for comparative example 1 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Figure 22 be the ferrite heat-resistant cast steel of comparative example 1 metallographic structure amplify 500 times when picture.
Figure 23 for comparative example 2 ferrite heat-resistant cast steel metallographic structure amplify 100 times when picture.
Figure 24 be the ferrite heat-resistant cast steel of comparative example 2 metallographic structure amplify 500 times when picture.
Figure 25 is the metallurgical tissue picture of field trash when ferrite heat-resistant cast steel of the invention normally adds rare earth.
Figure 26 be ferrite heat-resistant cast steel of the invention without rare earth when field trash metallurgical tissue picture.
Specific embodiment
（Embodiment 1）
The alloy compositions and its mass percent of the ferrite heat-resistant cast steel of the present embodiment are C：0.17%, Si：0.89%,
Mn：0.46%, P：0.013%, S：0.11%, Cr：13.71%, Ni：1.3%, N：0.056%, Re:0.01%, Nb：0.51%, Al：
0.10%, balance of iron and inevitable impurity.
The preparation method of the ferrite heat-resistant cast steel of the present embodiment, including step in detail below：
A. alloy melting.
Component and content according to alloy carry out dispensing, first load in stove bottom ash, then by 0.1% carburant, 74.33%
Steel scrap, 1.34% nickel plate, 22.2% ferrochrome, 0.81% ferro-niobium load in stove, skimmed after all molten steel is melt into, make new slag, work as molten steel
0.15% ferromanganese is added when temperature rises to 1540 DEG C carries out pre-deoxidation, and molten steel surface carries out covering and heat insulating and quickly carries out spectrum
Constituent analysis, then heats up and adds 0.35% sulphur iron, when liquid steel temperature is higher than 1600 DEG C, adds 1.06% silico-calcium deoxidier
Secondary deoxidation is carried out, is the low aluminum silicon calcium barium alloy of Nanjing Pujiang alloy company production, composition：Si:70%~75%, Ca：2%~
3%, Ba：6%~7%, Al<0.5%, remaining is iron.0.03% fine aluminium is added when liquid steel temperature is higher than 1650 DEG C take off eventually
Oxygen.
B. molten steel is gone out.
Dust debris of table etc. are cleaned up before going out molten steel, and ladle must be clean, and to be baked to red
Warm status；Go out molten steel rapidly when liquid steel temperature reaches liquid steel temperature, 0.10% rare earth silicon is put into before molten steel is come out of the stove, in ladle
Iron and 0.12% small aluminium block, the alloy compositions and its mass percent of wherein rare earth ferrosilicon are：Re:20%~25%, Ca:2%~
3%, Ba:3%~4%, Si:45%~55%, Mg:0.05%, remaining is iron, and small aluminium block is fine aluminium.
C. pour into a mould.
To use asbestos pushing off the slag, cast that casting mold cooling, cleaning of unpacking are treated after terminating in pouring molten steel to casting mold, in casting process
Obtain blank；
D. it is heat-treated.
By the temperature control of blank at 950 DEG C, 3h is incubated, then cools to 500 DEG C with the furnace, then be incubated 3h, air cooling of coming out of the stove,
Obtain final product ferrite heat-resistant cast steel part.
The metallographic structure of the ferrite heat-resistant cast steel part of the present embodiment is as depicted in figs. 1 and 2.
（Embodiment 2）
The alloy compositions and its mass percent of the ferrite heat-resistant cast steel of the present embodiment are C：0.20%, Si：1.29%,
Mn：0.48%, P：0.013%, S：0.089%, Cr：13.36%, Ni：1.25%, N：0.059%, Re:0.041%, Nb：0.57%, Al：
0.08%, balance of iron and inevitable impurity.
The preparation method of the ferrite heat-resistant cast steel of the present embodiment, including step in detail below：
A. alloy melting.
Component and content according to alloy carry out dispensing, first by bottom ash load stove in, then by 0.12% carburant,
74.25% steel scrap, 1.29% nickel plate, 21.64% ferrochrome, 0.91% ferro-niobium load in stove, skimmed after all molten steel is melt into, make new
Slag, 0.18% ferromanganese is added when liquid steel temperature rises to 1540 DEG C carries out pre-deoxidation, and it is simultaneously quick that molten steel surface carries out covering and heat insulating
Spectral component analysis is carried out, 0.33% sulphur iron is then heated up and add, when liquid steel temperature is higher than 1600 DEG C, 1.62% silicon is added
Ca deoxidizer carries out secondary deoxidation, is the low aluminum silicon calcium barium alloy of Nanjing Pujiang alloy company production, composition：Si:70%~75%,
Ca：2%~3%, Ba：6%~7%, Al<0.5%, remaining is iron.0.03% fine aluminium is added to enter when liquid steel temperature is higher than 1650 DEG C
Row final deoxidizing.
B. molten steel is gone out.
Dust debris of table etc. are cleaned up before going out molten steel, and ladle must be clean, and to be baked to red
Warm status；Go out molten steel rapidly when liquid steel temperature reaches liquid steel temperature, 0.30% rare earth silicon is put into before molten steel is come out of the stove, in ladle
Iron and 0.09% small aluminium block, the alloy compositions and its mass percent of wherein rare earth ferrosilicon are：Re:20%~25%, Ca:2%~
3%, Ba:3%~4%, Si:45%~55%, Mg:0.05%, remaining is iron, and small aluminium block is fine aluminium.
C. pour into a mould.
To use asbestos pushing off the slag, cast that casting mold cooling, cleaning of unpacking are treated after terminating in pouring molten steel to casting mold, in casting process
Obtain blank；
D. it is heat-treated.
By the temperature control of blank at 980 DEG C, 2.5h is incubated, then cools to 500 DEG C with the furnace, then be incubated 3h, sky of coming out of the stove
It is cold, obtain final product ferrite heat-resistant cast steel part.
The metallographic structure of the ferrite heat-resistant cast steel part of the present embodiment is as shown in Figure 3 and Figure 4.
（Embodiment 3）
The alloy compositions and its mass percent of the ferrite heat-resistant cast steel of the present embodiment are C：0.21%, Si：1.15%,
Mn：0.49%, P：0.021%, S：0.086%, Cr：13.18%, Ni：1.18%, N：0.051%, Re:0.07%, Nb：0.73%, Al：
0.09%, balance of iron and inevitable impurity.
The preparation method of the ferrite heat-resistant cast steel of the present embodiment, including step in detail below：
A. alloy melting.
Component and content according to alloy carry out dispensing, first load in stove bottom ash, then by 0.09% carburant, 68% resistance to
Hot-cast steel foundry returns, 24.95% steel scrap, 0.51% nickel plate, 5.59% crome metal, 0.42% ferro-niobium load in stove, treat all to be melt into steel
Skimmed after water, make new slag, add 0.1% ferromanganese to carry out pre-deoxidation when liquid steel temperature rises to 1540 DEG C, molten steel surface is covered
Lid insulation simultaneously quickly carries out spectral component analysis, then heats up and add 0.17% sulphur iron, when liquid steel temperature is higher than 1600 DEG C
When, add 0.37% silico-calcium deoxidier to carry out secondary deoxidation, it is the low aluminum silicon calcium barium alloy of Nanjing Pujiang alloy company production, into
Point：Si:70%~75%, Ca：2%~3%, Ba：6%~7%, Al<0.5%, remaining is iron.Add when liquid steel temperature is higher than 1650 DEG C
The fine aluminium for entering 0.12% carries out final deoxidizing.
B. molten steel is gone out.
Dust debris of table etc. are cleaned up before going out molten steel, and ladle must be clean, and to be baked to red
Warm status；Go out molten steel rapidly when liquid steel temperature reaches liquid steel temperature, 0.46% rare earth silicon is put into before molten steel is come out of the stove, in ladle
Iron and 0.10% small aluminium block, the alloy compositions and its mass percent of wherein rare earth ferrosilicon are：Re:20%~25%, Ca:2%~
3%, Ba:3%~4%, Si:45%~55%, Mg:0.05%, remaining is iron, and small aluminium block is fine aluminium.
C. pour into a mould.
To use asbestos pushing off the slag, cast that casting mold cooling, cleaning of unpacking are treated after terminating in pouring molten steel to casting mold, in casting process
Obtain blank；
D. it is heat-treated.
By the temperature control of blank at 910 DEG C, 3h is incubated, then cools to 500 DEG C with the furnace, then be incubated 3h, air cooling of coming out of the stove,
Obtain final product ferrite heat-resistant cast steel part.
The metallographic structure of the ferrite heat-resistant cast steel part of the present embodiment is as shown in Figure 5 and Figure 6.
（Embodiment 4 is to embodiment 10）
Embodiment 4 is as shown in table 1 to the alloy compositions and its mass percent of the ferrite heat-resistant cast steel of embodiment 10.
Embodiment 4 is same as Example 2 to the preparation method of the ferrite heat-resistant cast steel of embodiment 10.
Embodiment 4 to the ferrite heat-resistant cast steel part of embodiment 10 metallographic structure as shown in Fig. 7 to Figure 20.（Comparative example
1）
The alloy compositions and its mass percent of the cast steel of this comparative example are C：0.21%, Si：1.59%, Mn：0.59%, P：
0.015%, S：0.075%, Cr：21.47%, Ni：1.03%, N：0.055%, Re:0.01%, Nb：1.00%, Al：0.17%, it is balance of
Iron and inevitable impurity.
The alloy melting of the cast steel of this comparative example, go out molten steel and the method for cast is same as Example 1, the casting of this comparative example
Heat-Treatment of Steel is same as Example 2.
The metallographic structure of the steel-casting of this comparative example is as shown in figure 21 and figure.
（Comparative example 2）
The alloy compositions and its mass percent of the cast steel of this comparative example are C：0.21%, Si：1.46%, Mn：0.44%, P：
0.024%, S：0.084%, Cr：20.12%, Ni：1.05%, N：0.048%, Re:0.03%, Nb：2.96%, Al：0.08%, it is balance of
Iron and inevitable impurity.
The preparation method of the cast steel of this comparative example is same as Example 2.
The metallographic structure of the steel-casting of this comparative example is as shown in figure 23 and figure 24.
First, chemical composition
The embodiment of the present invention 1 is as shown in table 1 to the chemical composition of embodiment 10 and the cast steel of comparative example 1 and comparative example 2.
The chemical composition of the cast steel of table 1
| C | Si | Mn | P | S | Cr | Ni | Nb | Re | N | Al | |
| Embodiment 1 | 0.17 | 0.89 | 0.46 | 0.013 | 0.11 | 13.71 | 1.3 | 0.51 | 0.01 | 0.056 | 0.10 |
| Embodiment 2 | 0.20 | 1.29 | 0.48 | 0.013 | 0.089 | 13.36 | 1.25 | 0.57 | 0.041 | 0.059 | 0.08 |
| Embodiment 3 | 0.21 | 1.15 | 0.49 | 0.021 | 0.086 | 13.18 | 1.18 | 0.73 | 0.07 | 0.051 | 0.09 |
| Embodiment 4 | 0.19 | 1.10 | 0.46 | 0.019 | 0.091 | 13.46 | 1.09 | 0.65 | 0.06 | 0.055 | 0.10 |
| Embodiment 5 | 0.15 | 1.14 | 0.48 | 0.020 | 0.088 | 13.85 | 1.18 | 0.60 | 0.08 | 0.051 | 0.07 |
| Embodiment 6 | 0.13 | 1.12 | 0.47 | 0.021 | 0.089 | 13.66 | 1.15 | 0.61 | 0.06 | 0.054 | 0.08 |
| Embodiment 7 | 0.14 | 1.16 | 0.48 | 0.019 | 0.091 | 12.85 | 1.20 | 0.72 | 0.06 | 0.048 | 0.07 |
| Embodiment 8 | 0.16 | 1.09 | 0.46 | 0.017 | 0.093 | 12.76 | 1.18 | 0.75 | 0.07 | 0.045 | 0.05 |
| Embodiment 9 | 0.15 | 1.08 | 0.46 | 0.019 | 0.086 | 12.68 | 1.16 | 0.83 | 0.08 | 0.051 | 0.06 |
| Embodiment 10 | 0.17 | 1.05 | 0.45 | 0.018 | 0.082 | 12.54 | 1.21 | 0.89 | 0.07 | 0.053 | 0.08 |
| Comparative example 1 | 0.21 | 1.59 | 0.59 | 0.015 | 0.075 | 21.47 | 1.03 | 1.00 | 0.01 | 0.055 | 0.17 |
| Comparative example 2 | 0.21 | 1.46 | 0.44 | 0.024 | 0.084 | 20.12 | 1.05 | 2.96 | 0.03 | 0.048 | 0.08 |
2nd, mechanical property
The embodiment of the present invention 1 is as shown in table 2 to the mechanical property of embodiment 10 and the cast steel of comparative example 1 and comparative example 2.
The mechanical property of the cast steel of table 2
| Tensile strength Rm (RPa) | Plastic strength Rp0.2 (RPa) | Elongation A (%) | |
| Embodiment 1 | 727 | 515 | 8.5 |
| Embodiment 2 | 716 | 504 | 9.5 |
| Embodiment 3 | 693 | 487 | 6.5 |
| Embodiment 4 | 705 | 496 | 5.5 |
| Embodiment 5 | 709 | 501 | 6.0 |
| Embodiment 6 | 701 | 492 | 5.5 |
| Embodiment 7 | 685 | 479 | 4.5 |
| Embodiment 8 | 680 | 484 | 5.0 |
| Embodiment 9 | 672 | 459 | 5.5 |
| Embodiment 10 | 675 | 458 | 5.0 |
| Comparative example 1 | 414 | / | 0.5 |
| Comparative example 2 | 511 | 326 | 4.5 |
3rd, metallographic structure
See Fig. 1 to Figure 24, the metallographic group of ferrite heat-resistant cast steel material after Overheating Treatment of embodiment 1 to embodiment 10
Knit by two phase compositions, first is mutually the pure iron ferritic of white, and second is mutually the ferrite and black particle shape carbide of white
The compound phase of composition, the area occupation ratio of the first phase is less than 40%.The gold of the cast steel of comparative example 1 and comparative example 2 material after Overheating Treatment
By two phase compositions, first is mutually the pure iron ferritic of white to phase constitution, and second is mutually the ferrite and black particle shape carbon of white
The compound phase of compound composition, but the area occupation ratio of its first phase is more than 40%, and this surpasses mainly due to the content of chromium in chemical composition
Cross caused by 20%, the penalty of cast steel can have been caused, combination property has declined.
See that Figure 25 and Figure 26, Figure 25 are the gold of the field trash of the cast steel for meeting ferrite heat-resistant cast steel chemical composition of the present invention
Phase constitution picture, as can be seen from the figure adds the inclusion morphology of cast steel after rare earth element to be：Ith, III type field trash is carefully
1.5 grades；Ith, it is 0.5 grade that III type field trash is thick, without II, IV type field trash.Figure 26 is to meet ferrite heat-resistant cast steel of the present invention
Study point but without rare earth cast steel field trash metallurgical tissue picture, rare earth element is not added as can be seen from the figure
The inclusion morphology of cast steel is：Ith, it is 2.5 grades that III type field trash is thin；Ith, it is 1.5 grades that III type field trash is thick, IV 2 grades of field trash.
4th, heat resistance test data
1st, high-temperature oxidation resistant experiment
Using standard GB/T/T13303-91《The antioxygenic property assay method of steel》, Example 1 to embodiment 10,
Comparative example 1 and comparative example 2 and austenite heat-resistance stainless steel（DIN1.4826）Sample in 850 DEG C of atmospheric environments, insulation
200h, the oxidization condition of sample is shown in Table 3.
The high-temperature oxidation resistant result of the sample of table 3
As shown in Table 3, the embodiment of the present invention 1 is protected to the ferrite heat-resistant cast steel of embodiment 10 in 850 DEG C of atmospheric environments
The oxidation loss of weight of warm 200h is 2.4836 to 3.1592mg/cm2（2.4836 milligrams to every square centimeter 3.1592 every square centimeter
Milligram）, oxidation rate is less than 0.16g/m2·h（0.16 gram every square metre per hour）, with stronger high-temperature oxidation resistance, than
Austenite heat-resistance stainless steel（DIN1.4826）High-temperature oxidation resistance more preferably or quite.
2nd, thermal fatigue test
Using aircraft industry professional standard HB6660-1992《Sheet metal thermal fatigue test method》, Example 1 to reality
Apply example 10, comparative example 1 and comparative example 2 and austenite heat-resistance stainless steel（DIN1.4826）Sample in normal temperature between 850 DEG C
After carrying out 1200 heat fatigue circulations, sample is detected with fluorescent penetrant, result of the test is shown in Table 4.
The thermal fatigue test result of the sample of table 4
As shown in Table 4, the embodiment of the present invention 1 to embodiment 10 ferrite heat-resistant cast steel in normal temperature between 850 DEG C, heat
Fatigue life cycle occurs without crackle 1200 times, with austenite heat-resistance stainless steel（DIN1.4826）Quite.
Ferrite heat-resistant cast steel of the invention and preparation method thereof is not limited to the various embodiments described above.Obviously, above-mentioned implementation
Example is only intended to clearly illustrate example of the present invention, and is not the restriction to embodiments of the present invention.For institute
For the those of ordinary skill in category field, the change or change of other multi-forms can also be made on the basis of the above description
It is dynamic.There is no need and unable to be exhaustive to all of implementation method.And that these belong to that spirit of the invention extends out is aobvious
And the change that is clear to or among changing still in protection scope of the present invention.
Claims (14)
1. a kind of ferrite heat-resistant cast steel, it is characterised in that：The component and its mass percent of alloy be：C：0.10%~
0.25%, Si：0.6%~1.5%, Mn：0.2%~0.6%, P：≤ 0.05%, S：＞ 0.03% and≤0.12%, Cr：12%~13.9%,
Ni：0.8%~1.35%, N：0.01%~0.06%, Re:0.01%~0.1%, Nb：0.15%~3.0%, Al：0.01%~0.8%,
Balance of iron and inevitable impurity；
The preparation method of the ferrite heat-resistant cast steel, comprises the following steps：
A. alloy melting：Component and content according to alloy carry out dispensing, first load in stove bottom ash, then by carburant, useless
Steel, nickel plate, ferrochrome, ferro-niobium load in alkaline induction furnace, skimmed after all molten steel is melt into, new slag are made, when liquid steel temperature rises to
Ferromanganese, ferrosilicon are added at 1530 DEG C~1550 DEG C carries out pre-deoxidation, and molten steel insulation simultaneously quickly carries out spectral component analysis, then rises
Temperature simultaneously adds sulphur iron, when liquid steel temperature is higher than 1600 DEG C, adds silico-calcium deoxidier to carry out secondary deoxidation, when liquid steel temperature is higher than
Aluminium deoxidizer is added at 1650 DEG C carries out final deoxidizing；
B. molten steel is gone out：Rare earth ferrosilicon and aluminium block are put into ladle, liquid steel temperature goes out rapidly molten steel when reaching 1650 DEG C；
C. pour into a mould：Asbestos pushing off the slag, cast will be used casting mold cooling to be treated after terminating, is unpacked in pouring molten steel to casting mold, in casting process
Cleaning obtains blank；
D. it is heat-treated：By the temperature control of blank at 850 DEG C~1000 DEG C, 1h~3h is incubated, then cools to 500 DEG C with the furnace,
1h~3h is incubated again, come out of the stove air cooling or furnace cooling.
2. ferrite heat-resistant cast steel according to claim 1, it is characterised in that：The mass percentage content of the Cr is
12.5%~13.9%.
3. ferrite heat-resistant cast steel according to claim 2, it is characterised in that：The mass percentage content of the Si is
0.8%~1.2%.
4. ferrite heat-resistant cast steel according to claim 2, it is characterised in that：The mass percentage content of the Mn is
0.4%~0.5%.
5. ferrite heat-resistant cast steel according to claim 2, it is characterised in that：The mass percentage content of the Al is
0.01%~0.1%.
6. ferrite heat-resistant cast steel according to claim 1, it is characterised in that：The mass percentage content of the Nb
0.61%~3.0%.
7. ferrite heat-resistant cast steel according to claim 1, it is characterised in that：The mass percentage content of the Nb
0.61%~2.0%.
8. ferrite heat-resistant cast steel according to claim 1, it is characterised in that：The mass percentage content of the Nb
0.61%~1.0%.
9. ferrite heat-resistant cast steel according to claim 1, it is characterised in that：In the step D, by the temperature control of blank
System is at 980 DEG C~1000 DEG C.
10. ferrite heat-resistant cast steel according to claim 1, it is characterised in that：In the step B, going out the same of molten steel
When by rare earth ferrosilicon and aluminium block input steel flow in.
11. ferrite heat-resistant cast steels according to claim 1, it is characterised in that：The silico-calcium deoxidier is low aluminum silicon calcium
Barium alloy, the aluminium deoxidizer is fine aluminium.
12. ferrite heat-resistant cast steels according to claim 11, it is characterised in that：The alloy compositions of the rare earth ferrosilicon and
Its mass percent is：Re:20%~25%, Ca:2%~3%, Ba:3%~4%, Si:45%~55%, Mg:0.05%, remaining is iron.
13. ferrite heat-resistant cast steels according to claim 12, it is characterised in that：Rare earth element in the rare earth ferrosilicon
Including Ce elements and lanthanum element, the mass percentage content ＞ 20% of Ce elements in the rare earth ferrosilicon, Ce elements and lanthanum element
Mass ratio >=4.
The application of the ferrite heat-resistant cast steel described in a kind of 14. the claims 1, it is characterised in that：For manufacturing engine
The parts of exhaust system.
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