CN110218932A - Niobium-containing high-strength gray cast iron material and preparation method thereof - Google Patents
Niobium-containing high-strength gray cast iron material and preparation method thereof Download PDFInfo
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- CN110218932A CN110218932A CN201910561246.9A CN201910561246A CN110218932A CN 110218932 A CN110218932 A CN 110218932A CN 201910561246 A CN201910561246 A CN 201910561246A CN 110218932 A CN110218932 A CN 110218932A
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- niobium
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- 239000010955 niobium Substances 0.000 title claims abstract description 78
- 239000000463 material Substances 0.000 title claims abstract description 74
- 229910052758 niobium Inorganic materials 0.000 title claims abstract description 63
- 229910001060 Gray iron Inorganic materials 0.000 title claims abstract description 56
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 88
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 31
- 239000000126 substance Substances 0.000 claims abstract description 24
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 20
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 19
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 17
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 14
- 239000000956 alloy Substances 0.000 claims abstract description 14
- 229910052718 tin Inorganic materials 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims description 35
- 238000011081 inoculation Methods 0.000 claims description 28
- 238000005266 casting Methods 0.000 claims description 23
- 239000011572 manganese Substances 0.000 claims description 23
- 239000011651 chromium Substances 0.000 claims description 21
- 230000008018 melting Effects 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 16
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 7
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 6
- 229910000805 Pig iron Inorganic materials 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 6
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 4
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000009533 lab test Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000010703 silicon Substances 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 229910002804 graphite Inorganic materials 0.000 description 10
- 239000010439 graphite Substances 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 9
- 230000005496 eutectics Effects 0.000 description 9
- 229910001562 pearlite Inorganic materials 0.000 description 9
- 229910001018 Cast iron Inorganic materials 0.000 description 8
- 230000007547 defect Effects 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- 239000004615 ingredient Substances 0.000 description 6
- 238000005275 alloying Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 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 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 208000025599 Heat Stress disease Diseases 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- VAKIVKMUBMZANL-UHFFFAOYSA-N iron phosphide Chemical compound P.[Fe].[Fe].[Fe] VAKIVKMUBMZANL-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a niobium-containing high-strength gray cast iron material and a preparation method thereof, wherein the niobium-containing high-strength gray cast iron material comprises the following chemical components in percentage by weight: 3.20 to 3.45 percent of C, 1.6 to 2.1 percent of Si, 0.65 to 0.85 percent of Mn, less than 0.06 percent of P, 0.05 to 0.12 percent of S, 0.05 to 0.14 percent of Nb, 0.016 to 0.028 percent of N, 0.05 to 0.08 percent of Sn, 0.1 to 0.3 percent of Cr and the balance of Fe. The high-strength gray cast iron material containing niobium disclosed by the invention adopts high-carbon low-silicon components, the addition amount of alloy elements is less, the good heat-conducting property of the material is ensured, and meanwhile, the high-temperature mechanical property of the material is improved by optimizing the alloy components and adding trace Nb and N elements.
Description
Technical field
The present invention relates to gray cast iron and its preparation processes, in particular to a kind of niobium-containing high-strength gray cast iron material and its preparation
Method.
Background technique
Gray cast iron possesses preferable heating conduction, damping performance, machining property, resistance to as a kind of common material
The advantages that grinding performance and Production Practice of Casting Technologies, is widely used in motor cylinder block, cylinder cap, brake drum, flywheel etc. while bearing machinery
On the components of fatigue and heat fatigue.But common grey iron mechanical property is not high, the requirement day with market to material property
Benefit improves, and gray cast iron is also required to further promote its mechanical property on the basis of guaranteeing high-temperature behavior.
Currently in order to promote gray cast iron material mechanical property, research has carried out a large amount of in terms of alloy both at home and abroad
Work mainly promotes intensity by the way that the alloying elements such as a certain amount of Cr, Mo, Cu, Ni, Sn, V are added, but a large amount of close is added
Gold improves material cost.For this purpose, researchers carry out other influences of alloying element (Nb, N etc.) to gray cast iron properties
Numerous studies:
Chinese invention patent CN102690987A discloses a kind of micro-alloying synthesis gray cast iron and its casting method,
The invention strengthens gray cast iron by adding Nb and Zn.Nb alloy addition level is higher, increases material cost.The boiling point of Zn
Lower than the fusing point of cast iron, Zn is difficult to the defects of absorbing, being easy to produce stomata, and aggravating working environment.
Chinese invention patent CN103361540A discloses a kind of Low-alloy high-strength gray cast iron and preparation method thereof, comprising with
Lower chemical component, by weight percentage are as follows: C:3.0%-3.4%, Si:1.8%-2.2%, Mn:0.8%-1.5%, S:
0.08%-0.13%, P≤0.05%, Cu:0.4%-0.6%, Cr:0.2%-1.0%, N:0.02%-0.05%, surplus are
Fe and inevitable impurity.N element relative amount is higher in the gray cast iron alloy ingredient, without fixed N element in ingredient, is easy
There is nitrogen hole defect.
Chinese invention patent CN1653202A discloses a kind of gray cast iron alloy and casting internal combustion engine component, a large amount of by adding
The carbide formers such as Nb, Mo, V, Cr promote fatigue of materials intensity, and material mechanical processing performance is poor, Material shrinkage tendency compared with
Greatly, material cost is considerably increased.
Chinese invention patent CN108913985A discloses a kind of high-carbon equivalent high-strength gray cast iron and preparation method thereof, the hair
It is bright usually to increase intensity by adding the member such as a certain amount of Mo, Cu, Re, Nb, N under carbon equivalent high, increase material cost, material
It is larger that material shrinks tendency.
Summary of the invention
Present invention aim to provide a kind of while there is the low cost of excellent high-temperature behavior and mechanical property to contain
Niobium high-strength gray cast iron material and preparation method thereof.
To achieve the above object, a kind of niobium-containing high-strength gray cast iron material provided by the present invention, by weight percentage
It is made of following chemical component: C:3.20%~3.45%, Si:1.6%~2.1%, Mn:0.65%~0.85%, P <
0.06%, S:0.05%~0.12%, Nb:0.05%~0.14%, N:0.016%~0.028%, Sn:0.05%~
0.08%, Cr:0.1%~0.3%, surplus Fe.
Preferably, the niobium-containing high-strength gray cast iron material is by weight percentage by following chemistry
At being grouped as: C:3.20%~3.36%, Si:1.6%~1.95%, Mn:0.75%~0.85%, P < 0.04%, S:
0.067%~0.12%, Nb:0.09%~0.14%, N:0.016%~0.022%, Sn:0.07%~0.08%, Cr:
0.15%~0.25%, surplus Fe.
As preferred forms, the niobium-containing high-strength gray cast iron material is by weight percentage by following chemistry
At being grouped as: C:3.31%, Si:1.88%, Mn:0.78%, P:0.02%, S:0.067%, Nb:0.13%, N:0.022%,
Sn:0.07%, Cr:0.25%, surplus Fe.
Preferably, Si:C=0.46 in the chemical component of the niobium-containing high-strength gray cast iron material~
0.66:1；0.006%+Nb/7 < N < 0.012%+Nb/7.
The present invention also provides a kind of preparation methods of above-mentioned niobium-containing high-strength gray cast iron material, include the following steps:
1) alloy melting: the pig iron, steel scrap, foundry returns, manganese iron, ferro-niobium, sulphur iron, carburant, nitridation ferroalloy are melted
Refining adjusts chemical component according to hot metal composition result of laboratory test in furnace, stands 10 after molten iron temperature reaches 1470 DEG C~1510 DEG C
~20min, comes out of the stove；
2) inoculation: being added nitridation ferroalloy in casting ladle, and the coverage inoculator on nitridation ferroalloy falls molten iron
Enter and carries out inoculation in casting ladle；
3) casting is handled: by the molten iron drossing after inoculation, being poured, is poured when temperature is 1380 DEG C~1420 DEG C
Current-following inoculation when note.
Preferably, the step 1) and 2) in, nitridation ferroalloy include nitrogenized manganese and chromium nitride；Nitridation
Manganese is made of following chemical component by weight percentage: Mn > 85%, N > 7%, C < 1.0%, P < 0.03%, Si <
1%, S < 0.025%, surplus are Fe and inevitable impurity；Chromium nitride is by weight percentage by following chemical component group
At: Cr > 60%, N > 5%, C < 0.1%, P < 0.03%, Si < 2.5%, S < 0.04%, surplus is for Fe and unavoidably
Impurity.
Preferably, in the step 2), inovulant is 75SiFe in the packet that inoculation uses, granularity
For 8mm~18mm；The additional amount of inovulant is the 0.2%~0.4% of weight of molten iron in the packet.
Preferably, in the step 2), the granularity < 3mm of ferroalloy is nitrogenized.
Preferably, in the step 3), for FeSiSr, granularity is the inovulant that current-following inoculation uses
0.2mm~0.6mm.
Preferably, in the step 3), the additional amount of inovulant be weight of molten iron 0.06%~
0.1%.
The effect of each element in the present invention:
C:C is graphite element, and graphite is less to reduce Thermal Conductivity of Cast Irons energy, Production Practice of Casting Technologies etc., increases part contracting
Hole shrinkage porosite tendency；Graphite is more to will cause mechanical properties decrease.C content range of the present invention is 3.20%-3.45%.
Si:Si reduces solubility of the C in iron, and C element is promoted to generate graphite structure.Si content is more to reduce cast iron
Heating conduction, increasing matrix ferrite content makes mechanical properties decrease.Material of the present invention uses the low Si composition proportion of high C, Si/C
Ratio be 0.46~0.66:1, it is ensured that the Thermal conductivity and mechanical property of material, Si content range be 1.6%~
2.1%.
Mn and S:S content can be excessively segregated in eutectic cell, deteriorate the performance of cast iron.A small amount of S can form stone in conjunction with Mn
Black core promotes graphite forming core, refining eutectic group.The Mn of certain content is needed in cast iron in conjunction with S, but the higher meeting of Mn content
Keep graphite coarse, deteriorates material property.Mn content range 0.65%~0.85% of the present invention, S content range 0.05%~
0.12%.
P:P is generally harmful element, is present in crystal boundary, phosphorus content mistake in cast iron with low melting point binary or ternary iron phosphide eutectic
The toughness and compactness for reducing cast iron, casting cold cracking inclination increase more.For the diesel engine machine part required to compactness,
Phosphorus content is easy to control within 0.06%.
Nb and N: a certain amount of Nb can refine pearlite and eutectic cell, improve the mechanical property and thermal fatigue property of material；
Excessive Nb inhibits the precipitation of graphite by generating, and forms carbide, deteriorates material property.N can refining eutectic group, promotion pearlite
It generates, and so that graphite is shortened, be bent, be passivated；Excessive N easily forms gas hole defect, and a certain amount of Nb is added and is able to suppress nitrogen
Hole defect generates the hard phase of disperse, promotes mechanical property, strengthens the beneficial effect of Nb.The range of Nb of the present invention is 0.05%
The range of~0.14%, N are 0.016%~0.028%.The additive amount of Nb and N meets relational expression: 0.006%+Nb/7 < N <
0.012%+Nb/7 can give full play to the beneficial effect of Nb and N, avoid gas hole defect.
Sn:Sn is pearlite stable element, in solidification process, is segregated in austenite, and the C in austenite is hindered
It is spread into graphite, increases pearlite.Sn additional amount excessively makes cast iron brittle, deteriorates material mechanical performance.Sn's of the present invention
Range is 0.05%~0.08%
Cr: being added a small amount of chromium in gray cast iron, can inhibit to dissociate ferritic formation in structure of cast iron and guarantee had
Full pearlite, to improve tensile strength and hardness.Excessive Cr is added, the white structure of carbide can be obtained, it is serious to drop
Low machinability.The range of Cr of the present invention is 0.1%~0.3%.
Niobium-containing high-strength gray cast iron material of the invention uses the ingredient of the low silicon of high-carbon, and alloying element additive amount is less, protects
Card material possesses good heating conduction, while passing through optimized alloy ingredient and adding micro Nb and N element, improves material
Room temperature and mechanical behavior under high temperature.Nb can refine pearlite and eutectic cell, and the Hard Inclusion of disperse is easily formed with N；N can be refined
Eutectic cell promotes pearlite to generate, and so that graphite is shortened, be bent, be passivated.The compound addition of Nb and N, can strengthen the work of Nb
With, hence it is evident that the intensity and high-temperature behavior for promoting material avoid material and nitrogen hole defect occur, realize at a lower cost,
Obtain the gray cast iron material with excellent high-temperature behavior and mechanical property.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below.
Embodiment 1:
A kind of niobium-containing high-strength gray cast iron material, is made of following chemical component by weight percentage: C:3.31%,
Si:1.88%, Mn:0.78%, P:0.02%, S:0.067%, Nb:0.13%, N:0.022%, Sn:0.07%, Cr:
0.25%, surplus Fe.
Above-mentioned niobium-containing high-strength gray cast iron material the preparation method is as follows:
1) alloy melting: melting is carried out using mid-frequency melting furnace, furnace charge is the pig iron, steel scrap, foundry returns, manganese iron, ferro-niobium, increasing
Carbon agent etc. adjusts chemical component according to iron liquid components tests result in furnace, after molten iron temperature reaches 1490 DEG C, stands 18min,
Then it comes out of the stove；
2) inoculation: being added nitridation ferroalloy (granularity < 3mm) in packet, and the 75SiFe of weight of molten iron 0.3% is pregnant
It educates agent (granularity is 8mm~18mm) to be covered on above nitrogenized manganese, then molten iron is poured into and carries out inoculation in casting ladle, is suitably stirred
After mixing 1min, it is sprinkled into collection slag agent, is poured；
3) casting is handled: the molten iron after inoculation being poured at 1390 DEG C of temperature, is carried out while casting
The current-following inoculation of weight of molten iron 0.08%, inovulant are FeSiSr (granularity is 0.2mm~0.6mm).
The niobium-containing high-strength gray cast iron material of above-described embodiment 1, room temperature tensile strength 348MPa, 200 DEG C of tensile strength
326MPa, 400 DEG C of tensile strength 319MPa, thermal conductivity are 54W/ (m.K).
Embodiment 2:
A kind of niobium-containing high-strength gray cast iron material, is made of following chemical component by weight percentage: C:3.36%,
Si:1.95%, Mn:0.75%, P:0.04%, S:0.075%, Nb:0.09%, N:0.016%, Sn:0.08%, Cr:
0.15%, surplus Fe.
Above-mentioned niobium-containing high-strength gray cast iron material the preparation method is as follows:
1) alloy melting: melting is carried out using mid-frequency melting furnace, furnace charge is the pig iron, steel scrap, foundry returns, manganese iron, ferro-niobium, sulphur
Iron, carburant etc..Chemical component is adjusted according to iron liquid components tests result in furnace, after molten iron temperature reaches 1510 DEG C, is stood
Then 12min comes out of the stove；
2) inoculation: being added nitridation ferroalloy (granularity < 2mm) in packet, and the 75SiFe of weight of molten iron 0.35% is pregnant
Agent covering (granularity is 8mm~18mm) is educated on nitrogenized manganese, and then molten iron is poured into and carries out inoculation in casting ladle, is suitably stirred
After mixing 2min, it is sprinkled into collection slag agent, is poured；
3) casting is handled: the molten iron after inoculation being poured at 1400 DEG C of temperature, is carried out while casting
The current-following inoculation of weight of molten iron 0.10%, inovulant are FeSiSr (granularity is 0.2mm~0.6mm).
The niobium-containing high-strength gray cast iron material of above-described embodiment 2, the room temperature tensile strength 332MPa of material, 200 DEG C of tensions
Intensity 307MPa, 400 DEG C of tensile strength 298MPa, thermal conductivity is 55W/ (m.K).
Embodiment 3:
A kind of niobium-containing high-strength gray cast iron material, is made of following chemical component by weight percentage: C:3.20%,
Si:2.1%, Mn:0.65%, P < 0.06%, S:0.12%, Nb:0.05%, N:0.016%, Sn:0.05%, Cr:0.3%,
Surplus is Fe.
Above-mentioned niobium-containing high-strength gray cast iron material the preparation method is as follows:
1) alloy melting: melting is carried out using mid-frequency melting furnace, furnace charge is the pig iron, steel scrap, foundry returns, manganese iron, ferro-niobium, sulphur
Iron, carburant etc..Chemical component is adjusted according to iron liquid components tests result in furnace, after molten iron temperature reaches 1510 DEG C, is stood
Then 10min comes out of the stove；
2) inoculation: being added nitridation ferroalloy (granularity < 2mm) in packet, and the 75SiFe of weight of molten iron 0.2% is pregnant
It educates agent (granularity is 8mm~18mm) to be covered on above nitrogenized manganese, then molten iron is poured into and carries out inoculation in casting ladle, is suitably stirred
After mixing 2min, it is sprinkled into collection slag agent, is poured；
3) casting is handled: the molten iron after inoculation being poured at 1400 DEG C of temperature, is carried out while casting
The current-following inoculation of weight of molten iron 0.06%, inovulant are FeSiSr (granularity is 0.2mm~0.6mm).
The niobium-containing high-strength gray cast iron material of above-described embodiment 3, the room temperature tensile strength 320MPa of material, 200 DEG C of tensions
Intensity 301MPa, 400 DEG C of tensile strength 286MPa, thermal conductivity is 53W/ (m.K).
Embodiment 4:
A kind of niobium-containing high-strength gray cast iron material, is made of following chemical component by weight percentage: C:3.45%,
Si:1.6%, Mn:0.85%, P < 0.02%, S:0.05%, Nb:0.14%, N:0.028%, Sn:0.08%, Cr:0.1%,
Surplus is Fe.
Above-mentioned niobium-containing high-strength gray cast iron material the preparation method is as follows:
1) alloy melting: melting is carried out using mid-frequency melting furnace, furnace charge is the pig iron, steel scrap, foundry returns, manganese iron, ferro-niobium, sulphur
Iron, carburant etc..Chemical component is adjusted according to iron liquid components tests result in furnace, after molten iron temperature reaches 1470 DEG C, is stood
Then 20min comes out of the stove；
2) inoculation: being added nitridation ferroalloy (granularity < 2mm) in packet, and the 75SiFe of weight of molten iron 0.4% is pregnant
It educates agent (granularity is 8mm~18mm) to be covered on above nitrogenized manganese, then molten iron is poured into and carries out inoculation in casting ladle, is suitably stirred
After mixing 2min, it is sprinkled into collection slag agent, is poured；
3) casting is handled: the molten iron after inoculation being poured at 1400 DEG C of temperature, is carried out while casting
The current-following inoculation of weight of molten iron 0.10%, inovulant are FeSiSr (granularity is 0.2mm~0.6mm).
The niobium-containing high-strength gray cast iron material of above-described embodiment 4, the room temperature tensile strength 345MPa of material, 200 DEG C of tensions
Intensity 324MPa, 400 DEG C of tensile strength 318MPa, thermal conductivity is 54W/ (m.K).
Comparative example 1:
A kind of common grey iron material, chemical composition comprises the following components in percentage by weight are as follows: C:3.28%, Si:1.96%, Mn:
0.75%, P:0.03%, S:0.074%, Sn:0.07%, Cr:0.29%, surplus Fe.
The common grey iron material of above-mentioned comparative example 1, room temperature tensile strength 270MPa, 200 DEG C of tensile strength 248MPa,
400 DEG C of tensile strength 227MPa, thermal conductivity are 54W/ (m.K).
Comparative example 2:
A kind of gray cast iron material containing niobium, chemical composition comprises the following components in percentage by weight are as follows: C:3.30%, Si:1.92%, Mn:
0.80%, P:0.03%, S:0.088%, Nb:0.10%, Sn:0.08%, Cr:0.21%, surplus Fe.
The gray cast iron material containing niobium of above-mentioned comparative example 2, room temperature tensile strength 302MPa, 200 DEG C of tensile strength 272MPa,
400 DEG C of tensile strength 256MPa, thermal conductivity are 53W/ (m.K).
Niobium-containing high-strength gray cast iron material of the invention uses the ingredient of the low silicon of high-carbon, and alloying element additive amount is less, protects
Card material possesses good heating conduction, while passing through optimized alloy ingredient and adding micro Nb and N element, improves material
Room temperature and mechanical behavior under high temperature.Nb can refine pearlite and eutectic cell, and the Hard Inclusion of disperse is easily formed with N；N can be refined
Eutectic cell promotes pearlite to generate, and so that graphite is shortened, be bent, be passivated.The compound addition of Nb and N, can strengthen the work of Nb
With, hence it is evident that the intensity and high-temperature behavior for promoting material avoid material and nitrogen hole defect occur, realize at a lower cost,
Obtain the gray cast iron material with excellent high-temperature behavior and mechanical property.
The technical solution and feature of above-mentioned case study on implementation only to illustrate the invention, its object is to preferably allow be familiar with the skill
The personage of art is practiced, and it is not intended to limit the scope of the present invention, made by all Spirit Essences according to the present invention etc.
Changes or modifications are imitated, within that scope of the present invention.
Claims (10)
1. a kind of niobium-containing high-strength gray cast iron material, which is characterized in that be made of by weight percentage following chemical component: C:
3.20%~3.45%, Si:1.6%~2.1%, Mn:0.65%~0.85%, P < 0.06%, S:0.05%~0.12%,
Nb:0.05%~0.14%, N:0.016%~0.028%, Sn:0.05%~0.08%, Cr:0.1%~0.3%, surplus are
Fe。
2. niobium-containing high-strength gray cast iron material according to claim 1, which is characterized in that by weight percentage by as follows
Chemical component composition: C:3.20%~3.36%, Si:1.6%~1.95%, Mn:0.75%~0.85%, P < 0.04%, S:
0.067%~0.12%, Nb:0.09%~0.14%, N:0.016%~0.022%, Sn:0.07%~0.08%, Cr:
0.15%~0.25%, surplus Fe.
3. niobium-containing high-strength gray cast iron material according to claim 1, which is characterized in that by weight percentage by as follows
Chemical component composition: C:3.31%, Si:1.88%, Mn:0.78%, P:0.02%, S:0.067%, Nb:0.13%, N:
0.022%, Sn:0.07%, Cr:0.25%, surplus Fe.
4. niobium-containing high-strength gray cast iron material according to claim 1, which is characterized in that the niobium-containing high-strength gray cast iron
Si:C=0.46~0.66:1 in the chemical component of material；0.006%+Nb/7 < N < 0.012%+Nb/7.
5. the preparation method of niobium-containing high-strength gray cast iron material described in a kind of claims 1 or 2 or 3, which is characterized in that including
Following steps:
1) pig iron, steel scrap, foundry returns, manganese iron, ferro-niobium, sulphur iron, carburant, nitridation ferroalloy alloy melting: are subjected to melting, root
According in furnace hot metal composition result of laboratory test adjust chemical component, after molten iron temperature reaches 1470 DEG C~1510 DEG C stand 10~
20min comes out of the stove；
2) inoculation: being added nitridation ferroalloy in casting ladle, and molten iron is poured into and poured by the coverage inoculator on nitridation ferroalloy
Inoculation is carried out in packet；
3) casting is handled: the molten iron drossing after inoculation being poured when temperature is 1380 DEG C~1420 DEG C, when casting
Current-following inoculation.
6. the preparation method of niobium-containing high-strength gray cast iron material according to claim 5, which is characterized in that the step 1)
In 2), nitridation ferroalloy includes nitrogenized manganese and chromium nitride；The nitrogenized manganese is by weight percentage by following chemical component group
At: Mn > 85%, N > 7%, C < 1.0%, P < 0.03%, Si < 1%, S < 0.025%, surplus is for Fe and inevitably
Impurity；The chromium nitride is made of following chemical component by weight percentage: Cr > 60%, N > 5%, C < 0.1%, P <
0.03%, Si < 2.5%, S < 0.04%, surplus are Fe and inevitable impurity.
7. the preparation method of niobium-containing high-strength gray cast iron material according to claim 5, which is characterized in that the step 2)
In, for inovulant for 75SiFe, granularity is 8mm~18mm in the packet that inoculation uses；The additional amount of inovulant is in the packet
The 0.2%~0.4% of weight of molten iron.
8. the preparation method of niobium-containing high-strength gray cast iron material according to claim 5, which is characterized in that the step 2)
In, nitrogenize the granularity < 3mm of ferroalloy.
9. the preparation method of niobium-containing high-strength gray cast iron material according to claim 5, which is characterized in that the step 3)
In, for the inovulant that current-following inoculation uses for FeSiSr, granularity is 0.2mm~0.6mm.
10. the preparation method of niobium-containing high-strength gray cast iron material according to claim 9, which is characterized in that the step
3) in, the additional amount of inovulant is the 0.06%~0.1% of weight of molten iron.
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| CN115323258A (en) * | 2022-08-23 | 2022-11-11 | 一汽解放汽车有限公司 | Gray cast iron and preparation method and application thereof |
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Application publication date: 20190910 |