CN100355926C - Micro alloyed high strength grey cast iron - Google Patents
Micro alloyed high strength grey cast iron Download PDFInfo
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- CN100355926C CN100355926C CNB2005100168785A CN200510016878A CN100355926C CN 100355926 C CN100355926 C CN 100355926C CN B2005100168785 A CNB2005100168785 A CN B2005100168785A CN 200510016878 A CN200510016878 A CN 200510016878A CN 100355926 C CN100355926 C CN 100355926C
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- 229910001060 Gray iron Inorganic materials 0.000 title claims abstract description 43
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 5
- 239000004615 ingredient Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 18
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract description 12
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 12
- 239000011733 molybdenum Substances 0.000 abstract description 12
- 229910052759 nickel Inorganic materials 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 5
- 238000005266 casting Methods 0.000 abstract description 4
- 238000005275 alloying Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract 2
- 235000016768 molybdenum Nutrition 0.000 description 13
- 229910001018 Cast iron Inorganic materials 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- 239000010439 graphite Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 108010038629 Molybdoferredoxin Proteins 0.000 description 3
- HBELESVMOSDEOV-UHFFFAOYSA-N [Fe].[Mo] Chemical compound [Fe].[Mo] HBELESVMOSDEOV-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- DSMZRNNAYQIMOM-UHFFFAOYSA-N iron molybdenum Chemical compound [Fe].[Fe].[Mo] DSMZRNNAYQIMOM-UHFFFAOYSA-N 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention relates to novel high-strength microalloyed gray cast iron which is especially suitable for producing large-horsepower diesel engine cylinder bodies and other high-strength gray cast iron castings. The microalloying treatment is carried out by optimizing the alloying component design and adding V, N and other elements so as to finally obtain the novel high-strength microalloyed gray cast iron having the advantages of favorable tensile property and favorable processability. The novel high-strength microalloyed gray cast iron comprises the components of the percentage by weight: 2.92 to 3.485 of C, 1.52 to 2.36% of Si, 0.22 to 0.78% of Mn, 0.011 to 0.048% of P, 0.03 to 0.15% of S, 0.15 to 0.50% of Cr, 0.3 to 0.785 of Cu, 0.011 to 0.0985 of Sn, 0 to 0.100% of V and 0 to 0.100% of N. the present invention solves the problem of difficulty in the alloying by adding molybdenum, nickel and other elements in order to enhance the strength at present in the world.
Description
Technical field
Micro alloyed high strength grey cast iron of the present invention relates to a kind of novel cast iron materials, particularly relates to a kind of novel gray cast iron material of producing high-power diesel motor cylinder and other high-strength gray cast iron foundry goods that is mainly used in.
Background technology
Along with the control of communications and transportation to overload, the increasingly stringent that transfinites, the sale of large-tonnage heavy truck just increases severely with the speed in every year 60%, and amplification is in first of the automobile industry.Scholarly forecast, China heavily blocked market and will welcome " explosive type " rise period coming years, estimated that average annual growth will reach 17%.Therefore develop as " heart " of automobile and the engine of automobile core technology to high-power and high-speed direction.
Because the high-power diesel motor cylinder need bear higher mechanical stress and thermal stresses in the course of the work, therefore, require its cast iron quality must have homogeneity of fault plane preferably, comprise that performance, tissue, composition are even etc., and excellent mechanical property and castability.The coupon intensity of the graphitic cast iron of general requirement production high-power diesel motor cylinder is greater than 320 MPas, and the coupon diameter is 30 millimeters, and cylinder body body intensity is greater than 240 MPas.
For improve graphitic cast iron intensity, both at home and abroad at design of alloy, the microalloying of high-power diesel motor cylinder and other high-strength gray cast iron castings material and the aspect such as breed and carried out a large amount of research work, obtained certain achievement.At present, produce high-power diesel motor cylinder and other high-strength gray cast iron foundry goods both at home and abroad and mainly still produce, as seen by table 1,2 by adding alloying elements such as a certain amount of chromium, molybdenum, copper and mickel.Along with rising violently of iron alloy such as molybdenum-iron and nickel price in the world wide, producing the cost pressure that high-strength gray cast iron brought by traditional technology becomes one insurmountable barrier of pendulum in face of each manufacturer.Therefore, in order to reduce the production cost of high-strength gray cast iron, be badly in need of a kind of graphitic cast iron of novel high-strength cheaply of invention at present.
The chemical ingredients of domestic graphitic cast iron engine cylinder-body of table 1 and cylinder cap
| Sequence number | Chemical ingredients (weight percent) | Foundry goods | |||||||
| C | Si | Mn | P | S | Cr | Cu | Mo | ||
| 1 | 3.0-3.3 | 1.8-2.2 | 0.5-1.0 | ≤0.15 | ≤0.13 | X105, X100 cylinder body, |
|||
| 2 | 3.0-3.3 | 1.8-2.2 | 0.5-1.0 | ≤0.15 | ≤0.13 | 0.15-0.35 | 0.4-0.7 | The |
|
| 3 | 3.2-3.4 | 1.8-2.0 | 0.5-0.8 | ≤0.07 | ≤0.12 | 0.4-0.6 | 0.4-0.6 | |
|
| 4 | 3.2-3.4 | 1.9-2.1 | 0.6-0.9 | ≤0.08 | ≤0.12 | 0.25-0.35 | The EQ-140 |
||
| 5 | 3.25-3.45 | 1.8-2.2 | 0.6-0.9 | ≤0.08 | ≤0.1 | 0.25-0.35 | 0.35-0.45 | R1000 cylinder body, cylinder cap | |
| 6 | 3.15-3.3 | 1.6-2.1 | 0.75-1.0 | ≤0.2 | ≤0.1 | 0.2-0.4 | 0.5-1.0 | 0.3-0.5 | Cylinder cap |
| 7 | 3.15-3.4 | 2.1-2.5 | 0.6-0.75 | 0.06 | 0.06 | 0.25-0.35 | 0.3-0.4 | The 475Q cylinder body | |
| 8 | 3.2-3.5 | 2.0-2.4 | 0.6-1.0 | ≤0.15 | ≤0.1 | 0.3-0.4 | 0.7-1.0 | 195 cylinder caps | |
The chemical ingredients of external graphitic cast iron engine cylinder-body of table 2 and cylinder cap
| Sequence number | Country origin | Company | Foundry goods | Chemical ingredients (weight percent) | Tensile strength (MPa) | |||||||||
| C | Si | Mn | P | S | Cr | Mo | Cu | Sn | Ni | |||||
| 1 | Japan | Isuzu Motors | Cylinder cap | 3.2 | 2.28 | 0.73 | 0.041 | ≤0.1 | 0.17 | |||||
| 2 | Germany | M.A.N | The single cylinder lid | 3.4-3.5 | 1.9-2.0 | 0.6-0.7 | ≤0.1 | ≤0.13 | 0.15 | 0.25 | 0.2 | ≥250 | ||
| The twin-tub lid | 3.5-3.55 | 1.7-1.8 | 0.6-0.65 | ≤0.13 | 0.3 | 0.75 | ≥250 | |||||||
| 3 | Germany | Moto-rtey | The twin-tub lid | 3.4-3.5 | 1.8 | 0.65 | ≤0.1 | 0.3 | 0.35-0.45 | 1.0-1.1 | ≥280 | |||
| 4 | Germany | M.W.M | The single cylinder lid | 3.25-3.45 | 1.7-1.9 | 0.6-0.8 | ≤0.1 | ≤0.1 | 0.2-0.3 | 0.08 | 0.4-0.6 | ≥250 | ||
| 5 | Britain | Rolls-Royce | Cylinder body | 3.3-3.5 | 1.8-2.4 | 0.8 | ≤0.1 | ≤0.06 | 0.25-0.4 | 0.4 | 0.5 | ≥260 | ||
| 6 | France | C.A | Cylinder cap | 3.3-3.4 | 1.8-2.2 | 0.6-0.7 | ≤0.15 | ≤0.15 | 0.2-0.3 | 0.5 | ≥250 | |||
| 7 | The U.S. | John.Deere | Cylinder cap | 3.0-3.4 | 1.7-2.25 | 0.6-0.9 | ≤0.2 | ≤0.12 | 0.2-0.4 | 0.3-0.5 | 0.75-1.0 | 1.0-1.2 | ≥300 | |
| Cylinder cap | 3.2-3.6 | 2.0-2.5 | 0.4-0.9 | ≤0.15 | ≤0.15 | 0.2-0.4 | 0.3-0.5 | 0.75-1.0 | 1.0-1.2 | ≥225 | ||||
Summary of the invention
The objective of the invention is: under the prerequisite of the tensile strength that high-strength gray cast iron had that guarantees present adding molybdenum or molybdenum and nickel, a kind of elements such as molybdenum and nickel that replace by microalloying are provided, reduce the micro alloyed high strength grey cast iron of the production cost of high-strength gray cast iron greatly.
Above-mentioned purpose of the present invention is to realize like this, accompanying drawings is as follows: a kind of micro alloyed high strength grey cast iron comprises elements such as C, Si, Mn, P, S, Cr, Cu and Sn, by optimizing these elements, added micro-V and N element again, its weight percent chemical ingredients is:
C：2.92～3.48；Si：1.52～2.36；Mn：0.22～0.78；P：0.011～0.048；
S：0.03～0.15；Cr：0.15～0.50；Cu：0.3～0.78；Sn：0.011～0.098；
V：0～0.100；N：0～0.100。
The as-cast structure of the novel micro alloyed high strength grey cast iron of the present invention is an A type graphite, 4～6 grades; Content of pearlite in alloy 〉=95%, as depicted in figs. 1 and 2.Diameter is coupon tensile strength 〉=320 MPas of 30 millimeters.
The novel micro alloyed high strength grey cast iron of the present invention is compared with at present traditional high-strength gray cast iron, the major technique advantage that has is: at present traditional high-strength gray cast iron adds a large amount of molybdenum or molybdenum and nickel element for the tensile strength that improves graphitic cast iron is essential, and the present invention only need add the vanadium and the nitrogen element of minute quantity, just can reach the tensile strength level that adds a large amount of molybdenums or molybdenum and nickel.The Financial cost advantage of being brought by the major technique advantage will make the production cost of high-strength gray cast iron reduce greatly.Because the price of molybdenum-iron is in sharp increase at present, the price of current molybdenum-iron has increased to about 430,000 RMB/tons.Produce the high-strength gray cast iron molybdenum-iron that generally will add 4 kilograms per ton, cost is 1720 RMB.And novel micro alloyed high strength grey cast iron of the present invention additional cost per ton is only about 300 RMB, like this per ton reducing cost about 1400 RMB.The economic benefit that large-scale production brought will be very considerable.
Marginal data
Fig. 1 is the graphite form (A type graphite is main) of the novel micro alloyed high strength grey cast iron of the present invention.
Fig. 2 is the matrix (perlite+1% ferrite) of the novel micro alloyed high strength grey cast iron of the present invention.
Fig. 3 is a high-power Dao Yici diesel motor cylinder outward appearance photo.
Fig. 4 is the cylinder body body graphite form (A type graphite is main) of producing with the novel micro alloyed high strength grey cast iron of the present invention.
Fig. 5 is the cylinder body body matrix of producing with the novel micro alloyed high strength grey cast iron of the present invention (perlite+1% ferrite).
Embodiment
Below in conjunction with the accompanying drawing illustrated embodiment, further specify particular content of the present invention.
Embodiment one: the present invention optimizes the design of alloy of graphitic cast iron and the positively effect of microalloying is to replace elements such as molybdenum and nickel, and improves the tensile strength of graphitic cast iron, and its effect is fairly obvious, and tensile strength is significantly improved.The composition and the mechanical property of novel micro alloyed high strength grey cast iron are as shown in table 3.
The composition of the novel micro alloyed high strength grey cast iron of table 3 and mechanical property
| Test piece number (Test pc No.) | Chemical ingredients (weight percent) | Mechanical property | |||||||||||
| C | Si | Mn | P | S | Cr | Mo | Cu | V | Sn | N | Tensile strength (MPa) | Hardness (HB) | |
| 1 2 3 4 5 6 7 8 9 10 | 3.27 3.15 3.05 2.92 3.31 3.48 3.27 3.25 3.41 3.28 | 1.76 1.80 1.99 2.06 2.10 2.36 2.15 2.09 1.82 2.12 | 0.34 0.72 0.51 0.25 0.35 0.61 0.78 0.66 0.54 0.44 | 0.016 0.034 0.020 0.042 0.041 0.039 0.028 0.033 0.048 0.032 | 0.09 0.11 0.12 0.08 0.07 0.14 0.04 0.13 0.15 0.06 | 0.29 0.20 0.35 0.48 0.50 0.49 0.33 0.45 0.39 0.18 | / 0.2 / / / / / / / / | 0.55 0.63 0.50 0.51 0.75 0.62 0.50 0.60 0.58 0.56 | / / 0.017 0.035 0.051 0.048 0.088 0.100 0.075 0.100 | / 0.06 0.02 0.018 0.042 0.051 0.066 0.07 0.09 0.03 | / / 0.007 0.0092 0.01 0.05 0.09 0.082 0.100 0.094 | 300 330 340 365 360 360 370 390 375 395 | 208 239 228 229 231 230 233 240 237 242 |
Annotate: (1) No. 1 sample is a rolled products of ordinary high-strength graphitic cast iron; No. 2 samples are for adding the molybdenum high-strength gray cast iron; No. 3～No. 10 sample is the novel micro alloyed high strength grey cast iron of the present invention.
(2) 150 and 50 kilograms of medium-frequency induction furnaces are adopted in the preparation of sample respectively.1480～1520 ℃ of water outlets add 75 ferrosilicon and breed in casting ladle, cast φ 30 * 280mm round bar shape coupon is produced tensile strength coupon and metallographic specimen from this coupon in sand mold.
Embodiment two
Produce the Dao Yici cylinder body with the novel micro alloyed high strength grey cast iron of the present invention as a trial in a vapour Foundry Inc..High-power Dao Yici diesel motor cylinder complex structure, wall thickness difference is big, position 5～6mm that it is thin, thick position reaches 20～70mm, is the high-strength gray cast iron spare of typical inhomogeneous wall thickness, as shown in Figure 3.Its thick major part in use since intensity hang down under high mechanical stress and thermal stresses and ftracture easily.Adopt the novel micro alloyed high strength grey cast iron of the present invention to make this cylinder body, satisfying under the prerequisite of its requirement of strength design, will reduce its production cost greatly.Cylinder body anatomical results to trial production sees Table 4, and the metallographic structure photo is seen Fig. 4 and Fig. 5.
Table 4 adopts the result after the cylinder body of the novel micro alloyed high strength grey cast iron trial production of the present invention is dissected
The cylinder body that adopts the novel micro alloyed high strength grey cast iron of the present invention to produce as can be seen from Table 4, its tensile strength can satisfy requirement of strength design fully.Simultaneously, the intensity good uniformity, and hardness is lower than and adds the molybdenum high-strength gray cast iron, and this will help improving the processing characteristics of cylinder body.In addition, supercooled graphite and carbide do not occur at positions such as the wedge angle of cylinder body and overlaps, graphite form is good.Thereby show that the novel micro alloyed high strength grey cast iron of the present invention that adopts elements such as adding V, N to carry out the microalloying processing can replace traditional high-strength gray cast iron of elements such as adding molybdenum, nickel fully, produces high-power diesel motor cylinder and other high-intensity castings of gray cast iron of same intensity performance level.
Annual production as a high-power diesel motor cylinder manufacturing enterprise is 100,000 cylinder bodies, will be with 30,000 tons of molten iron, as adopt novel micro alloyed high strength grey cast iron of the present invention, will save about cost 4,000 ten thousand RMB, simultaneously, will save world's narrow resources such as a large amount of molybdenums, nickel for country.
Claims (1)
1. a micro alloyed high strength grey cast iron comprises elements such as C, Si, Mn, P, S, Cr, Cu and Sn, it is characterized in that adding micro-V and N element, and its weight percent chemical ingredients is:
C：2.92～3.48； Si：1.52～2.36； Mn：0.22～0.78； P：0.011～0.048；
S：0.03～0.15； Cr：0.15～0.50； Cu：0.3～0.78； Sn：0.011～0.098；
V：0.035～0.100； N：0.01～0.100。
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| CNB2005100168785A CN100355926C (en) | 2005-06-15 | 2005-06-15 | Micro alloyed high strength grey cast iron |
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| CNB2005100168785A CN100355926C (en) | 2005-06-15 | 2005-06-15 | Micro alloyed high strength grey cast iron |
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| CN1718825A CN1718825A (en) | 2006-01-11 |
| CN100355926C true CN100355926C (en) | 2007-12-19 |
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| BRPI0922740B1 (en) * | 2009-02-12 | 2017-12-05 | Teksid Do Brasil Ltda | METHOD FOR OBTAINING A HIGH PERFORMANCE CAST IRON CONNECTION FOR COMBUSTION ENGINES AND FILLED IN GENERAL. |
| CN101962731B (en) * | 2010-11-15 | 2012-04-11 | 吉林大学 | High-strength easy-cutting processing gray pig iron |
| CN102181780A (en) * | 2011-01-31 | 2011-09-14 | 潍柴动力股份有限公司 | Gray pig iron and production process thereof |
| CN102634722A (en) * | 2012-04-22 | 2012-08-15 | 洛阳古城机械有限公司 | Ash iron material, preparation technology thereof and pressure plate using same |
| CN102747267B (en) * | 2012-07-01 | 2013-05-15 | 吉林大学 | Micro alloyed gray cast iron with ultrahigh strength and high carbon equivalent |
| CN102851572B (en) * | 2012-08-31 | 2014-04-16 | 阴勇 | Nodular cast iron for axle housing |
| CN102876964B (en) * | 2012-09-08 | 2014-10-08 | 湖北江汉重工有限公司 | Gray cast iron and production technology thereof |
| CN103589944B (en) * | 2013-11-25 | 2015-12-02 | 青岛海之冠汽车配件制造有限公司 | A kind of graphitic cast iron and production method thereof |
| CN104612850B (en) * | 2015-02-12 | 2018-11-13 | 河北华北柴油机有限责任公司 | 12 cylinder diesel crankcases |
| CN108315631A (en) * | 2018-03-23 | 2018-07-24 | 深圳市金合联供应链技术有限公司 | A kind of grate high-strength gray cast iron and preparation method thereof |
| CN110079726B (en) * | 2019-06-01 | 2021-04-06 | 亚新科国际铸造（山西）有限公司 | Process for improving normal-temperature tension-compression fatigue strength of gray cast iron engine cylinder cover |
| CN114574752B (en) * | 2022-02-25 | 2023-02-28 | 宁国东方碾磨材料股份有限公司 | Free-cutting gray cast iron alloy for cylinder block and preparation method thereof |
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| WO2004083474A1 (en) * | 2003-03-19 | 2004-09-30 | Volvo Lastvagnar Ab | Grey cast iron for engine cylinder block and cylinder head |
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| WO2004083474A1 (en) * | 2003-03-19 | 2004-09-30 | Volvo Lastvagnar Ab | Grey cast iron for engine cylinder block and cylinder head |
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Granted publication date: 20071219 |