CN107893189B - The low rare earth austenite vermicular cast iron of high magnesium, preparation method and its application - Google Patents
The low rare earth austenite vermicular cast iron of high magnesium, preparation method and its application Download PDFInfo
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- CN107893189B CN107893189B CN201710953928.5A CN201710953928A CN107893189B CN 107893189 B CN107893189 B CN 107893189B CN 201710953928 A CN201710953928 A CN 201710953928A CN 107893189 B CN107893189 B CN 107893189B
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- cast iron
- iron
- rare earth
- high magnesium
- austenite
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- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 104
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 80
- 239000011777 magnesium Substances 0.000 title claims abstract description 80
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 44
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 44
- 229910001566 austenite Inorganic materials 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 118
- 229910052742 iron Inorganic materials 0.000 claims abstract description 57
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 56
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 47
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 38
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 30
- 239000010703 silicon Substances 0.000 claims abstract description 30
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 26
- 239000010936 titanium Substances 0.000 claims abstract description 22
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000011572 manganese Substances 0.000 claims abstract description 19
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 17
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 13
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 12
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000005864 Sulphur Substances 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 239000011651 chromium Substances 0.000 claims abstract description 12
- 239000010949 copper Substances 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 12
- 239000011574 phosphorus Substances 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 11
- 239000000470 constituent Substances 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims description 27
- 238000002844 melting Methods 0.000 claims description 27
- 239000007788 liquid Substances 0.000 claims description 25
- 238000011081 inoculation Methods 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- OOJQNBIDYDPHHE-UHFFFAOYSA-N barium silicon Chemical compound [Si].[Ba] OOJQNBIDYDPHHE-UHFFFAOYSA-N 0.000 claims description 10
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 9
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 8
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 8
- 229910000805 Pig iron Inorganic materials 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 238000009750 centrifugal casting Methods 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 229910052788 barium Inorganic materials 0.000 claims 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims 2
- 125000003636 chemical group Chemical group 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000002689 soil Substances 0.000 claims 1
- 229910002804 graphite Inorganic materials 0.000 abstract description 24
- 239000010439 graphite Substances 0.000 abstract description 24
- 239000011159 matrix material Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 abstract description 3
- 238000005453 pelletization Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000004458 analytical method Methods 0.000 description 7
- 238000009864 tensile test Methods 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910001141 Ductile iron Inorganic materials 0.000 description 3
- 229910001060 Gray iron Inorganic materials 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 235000007516 Chrysanthemum Nutrition 0.000 description 1
- 244000189548 Chrysanthemum x morifolium Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003984 copper intrauterine device Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0084—Pistons the pistons being constructed from specific materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F2200/00—Manufacturing
- F02F2200/06—Casting
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of low rare earth austenite vermicular cast iron of high magnesium, preparation method and its applications, belong to casting iron field.The low rare earth austenite vermicular cast iron of the high magnesium of the present invention, be made of following chemical constituent: carbon 2.0-3.8%, silicon 1.5-3.0%, manganese 0.8-2%, nickel 7-18%, copper 3-8%, chromium 0.05-2.7%, magnesium 0.08-0.12%, rare earth≤0.03%, titanium 0.1-0.18%, sulphur≤0.08%, phosphorus≤0.15%, remaining is iron and inevitable impurity.Structure of cast iron of the present invention is austenitic matrix, quasiflake graphite and few partial pelletizing shape graphite；Content and technique of the present invention by adjusting magnesium, titanium, rare earth and manganese, gained cast iron nodulizing rate >=91%, tensile strength is more than 360 MPa, and linear expansion coefficient reaches 18.9*10‑6, fabulous tensile strength and wearability are obtained, unexpected effect is achieved.
Description
Technical field
The present invention relates to casting iron field, in particular to the low rare earth austenite vermicular cast iron of a kind of high magnesium, preparation method and
It is applied.
Background technique
Piston is automobile engine " heart ", bears the mechanical load and thermic load of alternation, is the item that works in engine
One of worst key components and parts of part.A principal element for influencing all-aluminium piston service life is exactly piston ring groove mill
Damage, especially first of annular groove.
In order to improve the wearability of first of annular groove of aluminum piston, the wear-resisting ring seat of castingin cast iron (insert) is generallyd use in industry
As effective solution, this ring-mounted piston not only maintains the light-weight feature of aluminum piston, also has both cast-iron piston annular groove
Wear-resisting advantage, so that aluminum piston service life increases substantially, insert aluminum piston is also able to popularize application in an all-round way.
Currently, the material of insert mainly has nickelic and high manganese austenite grey cast-iron, most widely used is high-nickel austenite
Cast iron.The main component of high-nickel austenite insert is: nickel content 13.0-18.0%, copper content 4.0-8.0%, remaining for iron, carbon,
Silicon and other alloying elements.Matrix is austenite structure, and graphite form is all to be with A type (sheet)+Type B (chrysanthemum shape) graphite
It is main.Although traditional high-nickel austenite insert can satisfy state five and the piston requirement of engine is discharged by five or less states,
Country vigorously advocates under environmentally friendly requirement at present, and " state six " discharge standard will formally be implemented in the year two thousand twenty, in face of more stringent
Emission regulation, to the wearability of high-nickel austenite insert, more stringent requirements are proposed in this way, results in traditional nickelic Ovshinsky
Body cast iron ring carrier can not meet current " state six " regulatory emissions standards.
In summary, in high-nickel austenite insert production technology traditional at present, in order to ensure compliance with " state six "
The discharge standard of engine, needs to solve the problems such as current insert wearability is not high, linear expansion coefficient is relatively low, must carry out to this
Reasonable effective solution method is sought in deep scientific research.
Common cast iron materials according to graphite shape difference mainly have three classes in practice for production: gray cast iron, graphite are sheet,
Poor mechanical property, castability, damping property, antifriction quality notch sensitivity, machinability ratio are good；Spheroidal graphite cast-iron, graphite are spherical, mechanics
Performance is high；Vermicular cast iron, graphite fall between as vermiform, and mechanical property is slightly less than spheroidal graphite cast-iron, wearability, castability
Can be good compared with spheroidal graphite cast-iron, especially anti-high and low-temp croop property is good.Seeking one kind can solve that current insert wearability is high, line
The cast iron of the relatively low problem of the coefficient of expansion is key problem in technology and technological difficulties.
The applicant on April 12nd, 2017 to Patent Office, State Intellectual Property Office have submitted one application No. is
" 2017102370736 ", patent name are the patent of invention of " a kind of piston ring carrier cast iron materials and its manufacturing method ", the invention
Patent is announced on June 9th, 2017, and publication No. is " CN106811677A ".The technology that the patent of invention and the present invention solve
Problem is identical, but its effect is still undesirable, and in order to meet technical need, research and development nodulizing rate is higher, mechanical performance is higher
Cast iron materials are most important.
Summary of the invention
In order to make up for the deficiencies of the prior art, cast iron ring carrier wearability is not high in the prior art, linear expansion coefficient is inclined for solution
Low problem, the present invention provides a kind of low rare earth austenite vermicular cast iron of high magnesium, preparation method and its applications.
The technical solution of the present invention is as follows:
A kind of low rare earth austenite vermicular cast iron of high magnesium is made of according to mass percent following chemical constituent: carbon 2.0-
3.8%, silicon 1.5-3.0%, manganese 0.8-2%, nickel 7-18%, copper 3-8%, chromium 0.05-2.7%, magnesium 0.08-0.12%, rare earth≤0.03%,
Titanium 0.1-0.18%, sulphur≤0.08%, phosphorus≤0.15%, remaining is iron and inevitable impurity.
Preferably, according to mass percent, be made of following chemical constituent: carbon 2.8-3.2%, silicon 2.2-2.6%,
Manganese 1.0-1.5%, nickel 10-15%, copper 4-6%, chromium 1.0-1.5%, magnesium 0.09-0.11%, rare earth≤0.03%, titanium 0.13-0.16%,
Sulphur≤0.08%, phosphorus≤0.15%, remaining is iron and inevitable impurity.
Preferably, according to mass percent, be made of following chemical constituent: carbon 2.9-3.0%, silicon 2.3-2.5%,
Manganese 1.1-1.3%, nickel 11-13%, copper 4.5-5.5%, chromium 1.1-1.3%, magnesium 0.10-0.11%, rare earth≤0.02%, titanium 0.14-
0.15%, sulphur≤0.06%, phosphorus≤0.12%, remaining is iron and inevitable impurity.
Purposes of the low rare earth austenite vermicular cast iron of the high magnesium in piston ring carrier.
The preparation method of the low rare earth austenite vermicular cast iron of the high magnesium, comprising steps of
1) medium-frequency induction furnace melting is added in carburant, the pig iron, steel scrap, wherein carburant is placed in the bottom；After fusing
Electrolytic nickel, cathode copper, ferrosilicon, ferrochrome, manganese iron is added and continues melting, has addition after melting iron liquid to melt down iron filings；
2) when Cast Iron Melts ingredient is qualified and temperature reaches 1500-1600 DEG C, 10-20 minutes are kept the temperature；
3) the high magnesium vermiculizer that bottom is put into 0.2-0.8% is subcontracted in, and 0.10-0.18% titanium sponge and 0.3-0.7% is added
Silicon titanate innoculant, high magnesium vermiculizer, titanium sponge and silicon titanate innoculant are all covered using iron filings are melted down；
4) iron liquid of step 2 is poured into step 3) in subcontracting, carries out compactedization and first time inoculation 90 ± 15
Second；
5) compactedization and for the first time breed after the completion of, by iron liquid be transferred to casting pony ladle in, the silicon barium of 0.1-0.3% is added
The cast iron deslagging agent of inovulant and 0.1-0.2% carries out second of inoculation；
6) centrifugal casting machine mold is poured into after skimming, pouring temperature is 1400-1450 DEG C, obtains cast iron ring carrier blank.
Wherein, percentage involved in step 3) and step 6) is matter of the quality of respective substance compared with iron liquid quality
Measure percentage.
Preferably, the high magnesium vermiculizer is the high magnesium Silcaz of low rare earth, magnesium in the high magnesium vermiculizer
Mass fraction be 6-10%；The granularity of the high magnesium vermiculizer is 4-30mm.
Preferably, the granularity of titanium sponge described in step 3) is 2-8mm.
Preferably, the granularity of silicon titanate innoculant described in step 3) and step 5) is 2-8mm.
The invention has the benefit that
The present invention and the applicant apply, publication No. is " CN106811677A ", patent name is a kind of " piston ring carrier
The main distinction point of the patent of invention of cast iron materials and its manufacturing method " includes:
1) content of Magnesium in Cast Iron of the present invention significantly improves, while the lesser degree of content for increasing titanium；
Publication No. is " CN106811677A ", patent name is " a kind of piston ring carrier cast iron materials and its manufacturing method "
Patent in, titanium is considered as impurity element in fact, is not specifically added into titanium, and a small amount of titanium sponge is added in compactedization by the present invention；
Tests prove that increasing the amount of magnesium, spheroidization of graphite can be promoted, and spheroidization of graphite can be hindered by increasing titanium, and work as magnesium
With titanium in certain proportional region, nodulizing rate is significantly improved.
2) mass fraction of manganese significantly improves；
Mn itself is to prevent graphite element in cast iron, and S is to hinder graphited element strongly in cast iron, and S can also be reduced
The mechanical property and mobility of cast iron.Therefore, more fewer better containing S in cast iron.But Mn and S chemical combination form MnS, reduce S to stone
The adverse effect of inkization, therefore allow to have suitable Mn in cast iron.The content appropriate for improving manganese, general gray cast iron manganese content are
0.3%~2.0%, the capping as far as possible in the case where casting spoken parts in traditional operas does not occur can improve the tensile strength of cast iron；Manganese of the present invention
Content makes cast iron tensile strength obtained by the present invention reach peak.
3) present invention is complete by high magnesium vermiculizer, titanium sponge and silicon titanate innoculant using iron filings are melted down before creepage rate
Portion's covering；Vermiculizer reaction speed can be effectively reduced in the processing, increases nodulizing rate.
4) using vermiculizer is added outside furnace, subcontracted in carry out compactedization, vermiculizer reaction speed can be effectively reduced, increase
Add nodulizing rate.
5) titanium is added using outside furnace, with high magnesium vermiculizer be added jointly in subcontract, using magnesium with titanium to graphited opposite
Impact effect, increase nodulizing rate.
6) present invention is by inoculation twice.
Late inoculation effectively facilitates graphitization, refining eutectic group.
7) present invention gained blank, structure of cast iron are austenitic matrix, quasiflake graphite and few partial pelletizing shape graphite；
Gained cast iron nodulizing rate >=91% of the invention, tensile strength is more than 360 MPa, and linear expansion coefficient reaches 18.9*10-6, using this hair
Insert made from bright cast iron is used for piston, can effectively meet six engine of state to the performance requirement of piston by CAE analysis.
The present invention has further been obviously improved cast iron nodulizing rate by adjusting the content of magnesium, titanium, rare earth and manganese, obtains
Fabulous tensile strength and wearability, wearability improve 25% or more, overcome technological deficiency, achieve unexpected
Effect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the metallographic microscope of 1 gained cast iron of embodiment.
Specific embodiment
High magnesium vermiculizer used is the high magnesium Silcaz of low rare earth in each embodiment, the quality point of magnesium in high magnesium vermiculizer
Number is 6-10%；The high magnesium vermiculizer is commercially available by Ai Ken company.
Embodiment 1
A kind of low rare earth austenite vermicular cast iron of high magnesium is made of according to mass percent following chemical constituent:
Carbon 2.8%, silicon 2.6%, manganese 1.5%, nickel 10%, copper 6%, chromium 1.0%, magnesium 0.1%, rare earth 0.007%, titanium 0.15%, sulphur≤
0.08%, phosphorus≤0.15%, remaining is iron and inevitable impurity.
The preparation method of the low rare earth austenite vermicular cast iron of high magnesium, comprising steps of
1) medium-frequency induction furnace melting is added in carburant, the pig iron, steel scrap, wherein carburant is placed in the bottom；After fusing
Electrolytic nickel, cathode copper, ferrosilicon, ferrochrome, manganese iron is added and continues melting, has addition after melting iron liquid to melt down iron filings；
2) when Cast Iron Melts ingredient is qualified and temperature reaches 1560 DEG C, 15 minutes are kept the temperature；
3) the high magnesium vermiculizer (granularity 8-10mm) that bottom is put into 0.5% is subcontracted in, and 0.15% titanium sponge (granularity is added
For the silicon titanate innoculant (granularity 3-5mm) of 3-5mm) and 0.3-0.7%, use melt down iron filings by high magnesium vermiculizer, titanium sponge with
And silicon titanate innoculant all covers；
4) iron liquid of step 2 is poured into step 3) in subcontracting, carries out compactedization and first time inoculation 95 seconds；
5) compactedization and for the first time breed after the completion of, by iron liquid be transferred to casting pony ladle in, the silicon barium for being added 0.2% is bred
Agent (granularity 3-5mm) and 0.15% cast iron deslagging agent, carry out second of inoculation；
6) the centrifugal casting machine mold for manufacturing insert is poured into after skimming, pouring temperature is 1430 DEG C, obtains cast iron edge
It encloses blank (gained cast iron is used to prepare piston ring carrier).
Metallographic specimen observation is intercepted on cast blank, structure of cast iron is austenitic matrix, quasiflake graphite and few portion
Divide nodular graphite；The nodulizing rate of the cast iron materials is 93%,
Tensile test piece is intercepted on cast blank, measures 365 MPa of its tensile strength；
Piston is used for using insert made from cast iron of the present invention, six engine pair of state can effectively be met by CAE analysis
The performance requirement of piston.
Embodiment 2
A kind of low rare earth austenite vermicular cast iron of high magnesium is made of according to mass percent following chemical constituent:
Carbon 3.1%, silicon 2.3%, manganese 1.5%, nickel 13%, copper 5%, chromium 1.5%, magnesium 0.09%, rare earth 0.005%, titanium 0.6%, sulphur≤
0.08%, phosphorus≤0.15%, remaining is iron and inevitable impurity.
The preparation method of the low rare earth austenite vermicular cast iron of high magnesium, comprising steps of
1) medium-frequency induction furnace melting is added in carburant, the pig iron, steel scrap, wherein carburant is placed in the bottom；After fusing
Electrolytic nickel, cathode copper, ferrosilicon, ferrochrome, manganese iron is added and continues melting, has addition after melting iron liquid to melt down iron filings；
2) when Cast Iron Melts ingredient is qualified and temperature reaches 1550 DEG C, 17 minutes are kept the temperature；
3) the high magnesium vermiculizer (granularity 12-15mm) that bottom is put into 0.4% is subcontracted in, and 0.18% titanium sponge (grain is added
Degree is 2-4mm) and 0.3-0.7% silicon titanate innoculant (granularity 2-4mm), using melting down iron filings for high magnesium vermiculizer, titanium sponge
And silicon titanate innoculant all covers；
4) iron liquid of step 2 is poured into step 3) in subcontracting, carries out compactedization and first time inoculation 100 seconds；
5) compactedization and for the first time breed after the completion of, by iron liquid be transferred to casting pony ladle in, the silicon barium for being added 0.15% is bred
Agent (granularity 2-4mm) and 0.12% cast iron deslagging agent, carry out second of inoculation；
6) the centrifugal casting machine mold for manufacturing insert is poured into after skimming, pouring temperature is 1450 DEG C, obtains cast iron edge
It encloses blank (gained cast iron is used to prepare piston ring carrier).
Metallographic specimen observation is intercepted on cast blank, structure of cast iron is austenitic matrix, quasiflake graphite and few portion
Divide nodular graphite；The nodulizing rate of the cast iron materials is 92%,
Tensile test piece is intercepted on cast blank, measures 361 MPa of its tensile strength；
Piston is used for using insert made from cast iron of the present invention, six engine pair of state can effectively be met by CAE analysis
The performance requirement of piston.
Embodiment 3
A kind of low rare earth austenite vermicular cast iron of high magnesium is made of according to mass percent following chemical constituent:
Carbon 2.9%, silicon 2.5%, manganese 01.3%, nickel 8%, copper 7%, chromium 2.5%, magnesium 0.08%, rare earth≤0.0038%, titanium 0.12%,
Sulphur≤0.08%, phosphorus≤0.15%, remaining is iron and inevitable impurity.
The preparation method of the low rare earth austenite vermicular cast iron of high magnesium, comprising steps of
1) medium-frequency induction furnace melting is added in carburant, the pig iron, steel scrap, wherein carburant is placed in the bottom；After fusing
Electrolytic nickel, cathode copper, ferrosilicon, ferrochrome, manganese iron is added and continues melting, has addition after melting iron liquid to melt down iron filings；
2) when Cast Iron Melts ingredient is qualified and temperature reaches 1600 DEG C, 12 minutes are kept the temperature；
3) the high magnesium vermiculizer (granularity 6-15mm) that bottom is put into 0.28% is subcontracted in, and 0.17% titanium sponge (grain is added
Degree be 4-6mm) and 0.4% silicon titanate innoculant (granularity 4-6mm), using melt down iron filings by high magnesium vermiculizer, titanium sponge and
Silicon titanate innoculant all covers；
4) iron liquid of step 2 is poured into step 3) in subcontracting, carries out compactedization and first time inoculation 105 seconds；
5) compactedization and for the first time breed after the completion of, by iron liquid be transferred to casting pony ladle in, the silicon barium for being added 0.12% is bred
Agent (granularity 4-6mm) and 0.18% cast iron deslagging agent, carry out second of inoculation；
6) the centrifugal casting machine mold for manufacturing insert is poured into after skimming, pouring temperature is 1400 DEG C, obtains cast iron edge
It encloses blank (gained cast iron is used to prepare piston ring carrier).
Metallographic specimen observation is intercepted on cast blank, structure of cast iron is austenitic matrix, quasiflake graphite and few portion
Divide nodular graphite；The nodulizing rate of the cast iron materials is 91%,
Tensile test piece is intercepted on cast blank, measures 362 MPa of its tensile strength；
Piston is used for using insert made from cast iron of the present invention, six engine pair of state can effectively be met by CAE analysis
The performance requirement of piston.
Embodiment 4
A kind of low rare earth austenite vermicular cast iron of high magnesium is made of according to mass percent following chemical constituent:
Carbon 3.6%, silicon 2.5%, manganese 1.8%, nickel 12%, copper 5%, chromium 1.1%, magnesium 1.0%, rare earth 0.005%, titanium 0.125%, sulphur
≤ 0.08%, phosphorus≤0.15%, remaining is iron and inevitable impurity.
The preparation method of the low rare earth austenite vermicular cast iron of high magnesium, comprising steps of
1) medium-frequency induction furnace melting is added in carburant, the pig iron, steel scrap, wherein carburant is placed in the bottom；After fusing
Electrolytic nickel, cathode copper, ferrosilicon, ferrochrome, manganese iron is added and continues melting, has addition after melting iron liquid to melt down iron filings；
2) when Cast Iron Melts ingredient is qualified and temperature reaches 1530 DEG C, 20 minutes are kept the temperature；
3) the high magnesium vermiculizer (granularity 20-25mm) that bottom is put into 0.4% is subcontracted in, and 0.13% titanium sponge (grain is added
Degree be 7-8mm) and 0.65% silicon titanate innoculant (granularity 7-8mm), use melt down iron filings by high magnesium vermiculizer, titanium sponge with
And silicon titanate innoculant all covers；
4) iron liquid of step 2 is poured into step 3) in subcontracting, carries out compactedization and first time inoculation 90 seconds；
5) compactedization and for the first time breed after the completion of, by iron liquid be transferred to casting pony ladle in, the silicon barium for being added 0.25% is bred
Agent (granularity 7-8mm) and 0.11% cast iron deslagging agent, carry out second of inoculation；
6) the centrifugal casting machine mold for manufacturing insert is poured into after skimming, pouring temperature is 1420 DEG C, obtains cast iron edge
It encloses blank (gained cast iron is used to prepare piston ring carrier).
Metallographic specimen observation is intercepted on cast blank, structure of cast iron is austenitic matrix, quasiflake graphite and few portion
Divide nodular graphite；The nodulizing rate of the cast iron materials is 93%,
Tensile test piece is intercepted on cast blank, measures 363 MPa of its tensile strength；
Piston is used for using insert made from cast iron of the present invention, six engine pair of state can effectively be met by CAE analysis
The performance requirement of piston.
Embodiment 5
A kind of low rare earth austenite vermicular cast iron of high magnesium is made of according to mass percent following chemical constituent:
Carbon 2.3%, silicon 1.8%, manganese 1.1%, nickel 9%, copper 3%, chromium 0.5%, magnesium 0.1%, rare earth 0.006%, titanium 0.136%, sulphur≤
0.08%, phosphorus≤0.15%, remaining is iron and inevitable impurity.
The preparation method of the low rare earth austenite vermicular cast iron of high magnesium, comprising steps of
1) medium-frequency induction furnace melting is added in carburant, the pig iron, steel scrap, wherein carburant is placed in the bottom；After fusing
Electrolytic nickel, cathode copper, ferrosilicon, ferrochrome, manganese iron is added and continues melting, has addition after melting iron liquid to melt down iron filings；
2) when Cast Iron Melts ingredient is qualified and temperature reaches 1580 DEG C, 12 minutes are kept the temperature；
3) the high magnesium vermiculizer (granularity 10-20mm) that bottom is put into 0.45% is subcontracted in, and 0.14% titanium sponge (grain is added
Degree is 5mm) and 0.4% silicon titanate innoculant (granularity 5mm), using melting down iron filings for high magnesium vermiculizer, titanium sponge and silicon barium
Inovulant all covers；
4) iron liquid of step 2 is poured into step 3) in subcontracting, carries out compactedization and first time inoculation 85 seconds；
5) compactedization and for the first time breed after the completion of, by iron liquid be transferred to casting pony ladle in, the silicon barium for being added 0.2% is bred
Agent (granularity 5mm) and 0.16% cast iron deslagging agent, carry out second of inoculation；
6) the centrifugal casting machine mold for manufacturing insert is poured into after skimming, pouring temperature is 1420 DEG C, obtains cast iron edge
It encloses blank (gained cast iron is used to prepare piston ring carrier).
Metallographic specimen observation is intercepted on cast blank, structure of cast iron is austenitic matrix, quasiflake graphite and few portion
Divide nodular graphite；The nodulizing rate of the cast iron materials is 93%,
Tensile test piece is intercepted on cast blank, measures 365 MPa of its tensile strength；
Piston is used for using insert made from cast iron of the present invention, six engine pair of state can effectively be met by CAE analysis
The performance requirement of piston.
Embodiment 6
A kind of low rare earth austenite vermicular cast iron of high magnesium is made of according to mass percent following chemical constituent:
Carbon 3.0%, silicon 2.79%, manganese 1.2%, nickel 14.72%, copper 7.963%, chromium 0.74%, magnesium 0.09%, rare earth 0.018%, titanium
0.139%, sulphur 0.008%, phosphorus 0.038%, remaining is iron and inevitable impurity.
The preparation method of the low rare earth austenite vermicular cast iron of high magnesium, comprising steps of
1) medium-frequency induction furnace melting is added in carburant, the pig iron, steel scrap, wherein carburant is placed in the bottom；After fusing
Electrolytic nickel, cathode copper, ferrosilicon, ferrochrome, manganese iron is added and continues melting, has addition after melting iron liquid to melt down iron filings；
2) when Cast Iron Melts ingredient is qualified and temperature reaches 1580 DEG C, 12 minutes are kept the temperature；
3) the high magnesium vermiculizer (granularity 10-20mm) that bottom is put into 0.4% is subcontracted in, and 0.14% titanium sponge (grain is added
Degree is 5mm) and 0.4% silicon titanate innoculant (granularity 5mm), using melting down iron filings for high magnesium vermiculizer, titanium sponge and silicon barium
Inovulant all covers；
4) iron liquid of step 2 is poured into step 3) in subcontracting, carries out compactedization and first time inoculation 85 seconds；
5) compactedization and for the first time breed after the completion of, by iron liquid be transferred to casting pony ladle in, the silicon barium for being added 0.2% is bred
Agent (granularity 5mm) and 0.16% cast iron deslagging agent, carry out second of inoculation；
6) the centrifugal casting machine mold for manufacturing insert is poured into after skimming, pouring temperature is 1420 DEG C, obtains cast iron edge
It encloses blank (gained cast iron is used to prepare piston ring carrier).
Metallographic specimen observation is intercepted on cast blank, structure of cast iron is austenitic matrix, quasiflake graphite and few portion
Divide nodular graphite；The nodulizing rate of the cast iron materials is 93%,
Tensile test piece is intercepted on cast blank, measures 365 MPa of its tensile strength；
Piston is used for using insert made from cast iron of the present invention, six engine pair of state can effectively be met by CAE analysis
The performance requirement of piston.
Embodiment 6 and the applicant apply, publication No. is " CN106811677A ", patent name is a kind of " piston edge
The difference for the embodiment 3 that the patent of invention specification of circle cast iron materials and its manufacturing method " is recorded is only that content of magnesium, Ti content
Raising and technique with manganese content are adjusted；However due to distinguishing nodulizing rate above by 70% promotion to 93%, tensile strength
It is promoted by 333 MPa to 365 MPa, nodulizing rate and tensile strength and is promoted significantly.
Claims (6)
1. a kind of low rare earth austenite vermicular cast iron of high magnesium, which is characterized in that according to mass percent, be grouped by following chemical group
At: carbon 2.8-3.2%, silicon 2.2-2.6%, manganese 1.0-1.5%, nickel 10-15%, copper 4-6%, chromium 1.0-1.5%, magnesium 0.09-0.11%,
Rare earth≤0.03%, titanium 0.13-0.16%, sulphur≤0.08%, phosphorus≤0.15%, remaining is iron and inevitable impurity；
The preparation method of the low rare earth austenite vermicular cast iron of the high magnesium, comprising steps of
1) medium-frequency induction furnace melting is added in carburant, the pig iron, steel scrap, wherein carburant is placed in the bottom；It is added after fusing
Electrolytic nickel, cathode copper, ferrosilicon, ferrochrome, manganese iron continue melting, have addition after melting iron liquid to melt down iron filings；
2) when Cast Iron Melts ingredient is qualified and temperature reaches 1500-1600 DEG C, 10-20 minutes are kept the temperature；
3) the high magnesium vermiculizer that bottom is put into 0.2-0.8% is subcontracted in, and 0.10-0.18% titanium sponge and the silicon of 0.3-0.7% is added
Barium inovulant is all covered high magnesium vermiculizer, titanium sponge and silicon titanate innoculant using iron filings are melted down；
4) iron liquid of step 2 is poured into step 3) in subcontracting, carries out compactedization and first time inoculation 90 ± 15 seconds；
5) compactedization and for the first time breed after the completion of, by iron liquid be transferred to casting pony ladle in, the silicon barium that 0.1-0.3% is added is bred
The cast iron deslagging agent of agent and 0.1-0.2% carries out second of inoculation；
6) centrifugal casting machine mold is poured into after skimming, pouring temperature is 1400-1450 DEG C, obtains cast iron ring carrier blank.
2. the low rare earth austenite vermicular cast iron of high magnesium as described in claim 1, it is characterised in that: according to mass percent, by with
Lower chemical constituent composition: carbon 2.9-3.0%, silicon 2.3-2.5%, manganese 1.1-1.3%, nickel 11-13%, copper 4.5-5.5%, chromium 1.1-
1.3%, magnesium 0.10-0.11%, rare earth≤0.02%, titanium 0.14-0.15%, sulphur≤0.06%, phosphorus≤0.12%, remaining is iron and can not
The impurity avoided.
3. the low rare earth austenite vermicular cast iron of high magnesium as described in claim 1, it is characterised in that: the high magnesium vermiculizer is low dilute
The high magnesium Silcaz of soil, the mass fraction of magnesium is 6-10% in the high magnesium vermiculizer；The granularity of the high magnesium vermiculizer is 4-
30mm。
4. the low rare earth austenite vermicular cast iron of high magnesium as described in claim 1, it is characterised in that: titanium sponge described in step 3)
Granularity is 2-8mm.
5. the low rare earth austenite vermicular cast iron of high magnesium as described in claim 1, it is characterised in that: silicon described in step 3) and step 5)
The granularity of barium inovulant is 2-8mm.
6. purposes of the low rare earth austenite vermicular cast iron of high magnesium in piston ring carrier as described in claim 1.
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| CN108977610A (en) * | 2018-08-06 | 2018-12-11 | 尤洪习 | It is a kind of for producing the melting composition of cast iron |
| CN108823347A (en) * | 2018-08-06 | 2018-11-16 | 尤洪习 | A method of for melting cast iron |
| CN108950121A (en) * | 2018-08-06 | 2018-12-07 | 尤洪习 | It is a kind of for promoting the melting composition of cast iron purity |
| CN109609835B (en) * | 2019-01-14 | 2021-04-30 | 苏州勤美达精密机械有限公司 | High-toughness wear-resistant nodular cast iron and preparation process and application thereof |
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Denomination of invention: High magnesium and low rare earth austenitic vermicular graphite cast iron, its preparation method and application Granted publication date: 20190920 Pledgee: Binzhou branch of China CITIC Bank Co.,Ltd. Pledgor: BINZHOU BOHAI PISTON Co.,Ltd. Registration number: Y2024980014544 |