CN105154760A - Spheroidal graphite cast iron material for truck hub and preparation method of spheroidal graphite cast iron material - Google Patents
Spheroidal graphite cast iron material for truck hub and preparation method of spheroidal graphite cast iron material Download PDFInfo
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- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 76
- 239000000463 material Substances 0.000 title claims abstract description 73
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 113
- 229910052742 iron Inorganic materials 0.000 claims abstract description 56
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000011081 inoculation Methods 0.000 claims abstract description 34
- 238000003723 Smelting Methods 0.000 claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims description 27
- 229910052749 magnesium Inorganic materials 0.000 claims description 22
- 229910052746 lanthanum Inorganic materials 0.000 claims description 16
- 229910052717 sulfur Inorganic materials 0.000 claims description 15
- 229910052797 bismuth Inorganic materials 0.000 claims description 14
- 229910052804 chromium Inorganic materials 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 229910052748 manganese Inorganic materials 0.000 claims description 14
- 239000002667 nucleating agent Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 238000005266 casting Methods 0.000 claims description 13
- 229910052787 antimony Inorganic materials 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 12
- 238000007711 solidification Methods 0.000 claims description 12
- 230000008023 solidification Effects 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 11
- 238000007493 shaping process Methods 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 239000007858 starting material Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 12
- 239000010439 graphite Substances 0.000 abstract description 11
- 229910002804 graphite Inorganic materials 0.000 abstract description 11
- 238000005336 cracking Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 229910052761 rare earth metal Inorganic materials 0.000 description 11
- 229910000616 Ferromanganese Inorganic materials 0.000 description 9
- 229910000805 Pig iron Inorganic materials 0.000 description 9
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 150000002910 rare earth metals Chemical class 0.000 description 8
- 229910052750 molybdenum Inorganic materials 0.000 description 6
- 229910001018 Cast iron Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 230000002929 anti-fatigue Effects 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Abstract
The invention discloses a spheroidal graphite cast iron material for a truck hub and a preparation method of the spheroidal graphite cast iron material, and belongs to the technical field of spheroidal graphite cast iron materials. The material mainly comprises the following chemical components in percentage by weight: 2.50-3.60% of C, 2.20-3.20% of Si, 0.45-1.20% of Mn, less than or equal to 0.02% of S, less than or equal to 0.03% of P, 0.30-0.5% of Cr, 0.35-0.55% of Cu, 0.02-0.04% of Mg, 0.04-0.08% of RE, 0.01-0.06% of Bi, 0.01-0.05% of La, and the balance of Fe. The method comprises the following steps: (1) iron liquid smelting; (2) spheroidization inoculation. The invention aims to provide the spheroidal graphite cast iron material, which is high in toughness, high in graphite spheroidization rate, low in possibility of breakage or cracking and better in mechanical property, and can be subjected to heat treatment, for the truck hub, as well as the preparation method of the spheroidal graphite cast iron material; the spheroidal graphite cast iron material is used for preparing the loading truck hub.
Description
Technical field
The present invention relates to a kind of ductile cast iron material, more particularly, particularly relate to a kind of truck hub ductile cast iron material.The present invention also relates to the preparation method of above-mentioned ductile cast iron material simultaneously.
Background technology
Along with the fast development of China's economic, Road and Traffic transport undertaking also achieves the achievement of advancing by leaps and bounds, and country increases the transportation demand amount of lorry.Wheel hub is as one of most important safety component of truck carrying, its q&r seems particularly important, because the quality of wheel hub is not only related to the security of vehicle and passengers inside the car's goods and materials, and have influence on the performances such as vehicle stationarity in the process of moving, steering quality, comfortableness.So require that the dimensional precision of wheel hub is high, good dynamic balance, fatigue strength are high, there is the comprehensive mechanical properties such as good high-strength and high ductility simultaneously.
Spheroidal graphite cast iron, since nineteen forty-three comes out, owing to having adaptability widely and excellent technique and processing characteristics to various mechanical zero component, thus has developed rapidly and becomes a kind of mechanical engineering material with broad field of application.From boss material angle, current main flow still adopts Nodular cast iron material, spheroidal graphite cast iron is owing to having excellent anti-fatigue performance, compared with the flake graphite in graphitic cast iron, globular graphite is light to the successional destruction of matrix, and the stress concentration effect produced is also lower, and intensity and toughness are much better than gray iron, also maintain that graphitic cast iron is wear-resisting, vibration damping, the insensitive and good advantage of castability to breach simultaneously to some extent, in large-scale or crucial foundry goods, still have important application.
Simultaneously, graphite is spherical distribution matrix, can not produce matrix and isolate effect, remain the mechanical property that matrix is good, there is production cost lower simultaneously, the good advantage of fatigue resistance, therefore spheroidal graphite cast iron is widely used in producing auto-parts as truck hub etc., therefore manufactures truck hub, spheroidal graphite cast iron is best Material selec-tion, there is preparation technology simple, easy to operate advantage.
Summary of the invention
Last object of the present invention is for above-mentioned the deficiencies in the prior art, provides that a kind of toughness is high, graphite pebbles rate is high, simultaneously low, the not easy fracture or occur crackle and mechanical property is better of cost of manufacture, and heat treatable truck hub ductile cast iron material.
After of the present invention an object be to provide a kind of simple to operate, be convenient to implement and can the method for the above-mentioned truck hub ductile cast iron material of preparation of industrialized mass production.
Last technical scheme of the present invention is achieved in that a kind of truck hub ductile cast iron material, and this material mainly comprises the Chemical Composition of following mass percent: C:2.50 ~ 3.60%, Si:2.20 ~ 3.20%, Mn:0.45 ~ 1.20%, S :≤0.02%, P :≤0.03%, Cr:0.30 ~ 0.5%, Cu:0.35 ~ 0.55%, Mg:0.02 ~ 0.04%, RE:0.04 ~ 0.08%, Bi:0.01 ~ 0.06%, La:0.01 ~ 0.05%, surplus is iron.
In above-mentioned truck hub ductile cast iron material, this material mainly comprises the Chemical Composition of following mass percent: C:3.0 ~ 3.5%, Si:2.5 ~ 3.10%, Mn:0.50 ~ 1.10%, S :≤0.02%, P :≤0.03%, Cr:0.32 ~ 0.45%, Cu:0.40 ~ 0.45%, Mg:0.02 ~ 0.03%, RE:0.04 ~ 0.07%, Bi:0.03 ~ 0.06%, La:0.01 ~ 0.03%, surplus is iron.
In above-mentioned truck hub ductile cast iron material, this material also comprises the Chemical Composition of following mass percent: Mo:0.35 ~ 0.40%, Sb:0.002 ~ 0.006%.
In above-mentioned truck hub ductile cast iron material, this material also comprises the Chemical Composition of following mass percent: Mo:0.36 ~ 0.40%, Sb:0.004 ~ 0.006%.
In above-mentioned truck hub ductile cast iron material, this material also comprises the Chemical Composition of following mass percent: Ni:0.2 ~ 0.8%.
In above-mentioned truck hub ductile cast iron material, this material also comprises the Chemical Composition of following mass percent: Ni:0.25 ~ 0.70%.
After of the present invention, a technical scheme is achieved in that a kind of preparation method of truck hub ductile cast iron material, and the method comprises the steps:
(1) Smelting of iron: according to the good starting material of formulated, the starting material prepared are placed in medium-frequency induction furnace and add hot smelting, come out of the stove when iron liquid is heated to 1470 ~ 1550 DEG C;
(2) spheroidization and inoculation: adopt and pour method spheroidization and inoculation, nodulizing agent is placed in after bottom casting ladle, coverage inoculator above it, then cover raw scrap material compression, finally pour iron liquid again, spheroidization and inoculation 35 ~ 40 seconds obtained ductile iron liquid; Poured into when temperature 1360 ~ 1420 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, the duration of pouring is 30 ~ 40 seconds, forms foundry goods after shaping cooling.
In the preparation method of above-mentioned truck hub ductile cast iron material, the nodulizing agent described in step (2) is FeSiMg7RE nodulizing agent, and add-on is 1.0 ~ 1.5% of raw material total mass.
In the preparation method of above-mentioned truck hub ductile cast iron material, the nucleating agent described in step (2) is HY-75Ba3 nucleating agent, and add-on is 0.5 ~ 1.2% of raw material total mass.
After the present invention adopts technique scheme, compared with existing ductile cast iron material and preparation method, there is following significant beneficial effect:
(1) the present invention is on the existing composition proportion basis of spheroidal graphite cast iron, and add the alloying element of appropriate amount as Sb, Cu and rare-earth elements La, the existing performance improving magnesium iron reaches and then optimizes the effect of its mechanical property.Rare-earth elements La Main Function refinement graphite also improves its shape.Further, in ductile iron material, add the Sb of trace, play refinement graphite, improve graphite form, suppress to occur chunky graphite in thick and large section, the Sb of trace can make the graphite pebbles in truck hub spheroidal graphite cast iron become rounding more; Meanwhile, the acting in conjunction of Sb and La element, adds appropriate La, and in magnesium iron, graphite pebbles obviously attenuates little, is evenly distributed, and the isolate effect of graphite to matrix obviously reduces, and significantly improves the mechanical property of magnesium iron.The Sb amount of adding in the application, be far smaller than its conventional addition, but experiment proves, adds the Sb of trace, considerably improve the performance of whole ductile cast iron material in the present invention's formula.
Meanwhile, preferably, the Ni of appropriate amount is added, Ni well promotes perlite effect, and it is obvious that appropriate Ni improves cast iron mechanical property, avoids the undesirable action because segregation causes, improve the homogeneity of the tissue of large section casting parts, intensity and hardness simultaneously, reduce sensitivity profile.
(2) adjust rare earth element and add the comprehensive mechanical property that nickel element mainly improves truck hub ductile cast iron material, being applicable to industrialized mass production, reducing defect and occur;
(3) Cr of trace is strong stabilizing pearlite, and preferably, add suitable Mo, Mo mainly improves as-cast pearlitic and ferritic microhardness, and meanwhile, Mo can stablize and refine pearlite, makes cast iron materials performance more excellent.
(4) the inventive method utilizes unselected clay sand molding, places dark chill and guarantees consecutive solidification, casting after mould drying in die cavity, can mass production wheel hub.
(5) the wheel hub ductile cast iron material using present component proportioning and preparation method to prepare has good mechanical property, can meet the performance requirement of wheel hub to intensity, antifatigue and hardness.Have and there is certain toughness, ensure safety requirements that is not cracked in using and that break.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but do not form any limitation of the invention.
A kind of truck hub ductile cast iron material of the present invention, this material mainly comprises the Chemical Composition of following mass percent: C:2.50 ~ 3.60%, Si:2.20 ~ 3.20%, Mn:0.45 ~ 1.20%, S :≤0.02%, P :≤0.03%, Cr:0.30 ~ 0.5%, Cu:0.35 ~ 0.55%, Mg:0.02 ~ 0.04%, RE:0.04 ~ 0.08%, Bi:0.01 ~ 0.06%, La:0.01 ~ 0.05%, surplus is iron.
Preferably, this material mainly comprises the Chemical Composition of following mass percent: C:3.0 ~ 3.5%, Si:2.5 ~ 3.10%, Mn:0.50 ~ 1.10%, S :≤0.02%, P :≤0.03%, Cr:0.32 ~ 0.45%, Cu:0.40 ~ 0.45%, Mg:0.02 ~ 0.03%, RE:0.04 ~ 0.07%, Bi:0.03 ~ 0.06%, La:0.01 ~ 0.03%, surplus is iron.
Further, for improving the mechanical property of product, this material also comprises the Chemical Composition of following mass percent: Mo:0.35 ~ 0.40%, Sb:0.002 ~ 0.006%.The preferable range of above-mentioned Chemical Composition is Mo:0.36 ~ 0.40%, Sb:0.004 ~ 0.006%.
Meanwhile, this material also comprises the Chemical Composition of following mass percent: Ni:0.2 ~ 0.8%.The preferable range of this Chemical Composition is Ni:0.25 ~ 0.70%.
The preparation method of a kind of truck hub ductile cast iron material of the present invention, the method comprises the steps:
(1) Smelting of iron: according to formulated low-sulfur high duty pig iron, ferromanganese, cast iron foundry returns and steel scrap, the starting material prepared are placed in medium-frequency induction furnace and add hot smelting, come out of the stove when iron liquid is heated to 1470 ~ 1550 DEG C;
(2) spheroidization and inoculation: adopt and pour method spheroidization and inoculation, nodulizing agent is placed in after bottom casting ladle, coverage inoculator above it, finally pours iron liquid again, spheroidization and inoculation 35 ~ 40 seconds obtained ductile iron liquid; Poured into when temperature 1360 ~ 1420 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, the duration of pouring is 30 ~ 40 seconds, forms foundry goods after shaping cooling.Wherein said nodulizing agent is FeSiMg7RE nodulizing agent, and add-on is 1.0 ~ 1.5% of raw material total mass.Described nucleating agent is HY-75Ba3 nucleating agent, and add-on is 0.5 ~ 1.2% of raw material total mass.
Embodiment 1
Formula (composition and mass percent): C:3.38%, Si:3.06%, Mn:0.52%, S:0.009%, P:0.018%, Cr:0.35%, Cu:0.42%, Mo:0.37%, Mg:0.022%, RE:0.055%, Sb:0.0042%, Bi:0.032%, Ni:0.27%, La:0.023%, surplus is iron.
Preparation method: (1) Smelting of iron: alloy raw material such as the preparation pig iron, ferromanganese etc., medium-frequency induction furnace adds hot smelting, treats that iron liquid is heated to 1520 DEG C and comes out of the stove;
(2) iron liquid spheroidization and inoculation process: adopt and pour method spheroidization and inoculation technique, FeSiMg7RE type rare earth magnesium nodularizer is placed in after bottom casting ladle, after covering HY-75Ba3 type nucleating agent above it, finally pouring iron liquid, spheroidization and inoculation 40 seconds obtained ductile iron liquid; Poured into when temperature 1400 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, 35 seconds durations of pouring, shaping cooling, forms foundry goods.Obtain the ductile cast iron material of truck hub of the present invention.Performance is in table 1.
Embodiment 2
Formula (composition and mass percent): C:3.0%, Si:2.5%, Mn:0.5%, S:0.016%, P:0.015%, Cu:0.40%, Cr:0.32%, Mo:0.36%, Mg:0.02%, RE:0.04%, Sb:0.004%, Bi:0.03%, Ni0.25%, La:0.01%, surplus is iron.
Preparation method: (1) Smelting of iron: alloy raw material such as the preparation pig iron, ferromanganese etc., medium-frequency induction furnace adds hot smelting, treats that iron liquid is heated to 1510 DEG C and comes out of the stove;
(2) iron liquid spheroidization and inoculation process: adopt and pour method spheroidization and inoculation technique, FeSiMg7RE type rare earth magnesium nodularizer is placed in after bottom casting ladle, after covering HY-75Ba3 type nucleating agent above it, finally pouring iron liquid, spheroidization and inoculation 35 seconds obtained ductile iron liquid; Poured into when temperature 1380 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, 30 seconds durations of pouring, shaping cooling, forms foundry goods.Obtain the ductile cast iron material of truck hub of the present invention.Performance is in table 1.
Embodiment 3
Formula (composition and mass percent): C:3.5%, Si:3.10%, Mn:1.10%, S:0.02%, P:0.03%, Cr:0.45%, Cu:0.45%, Mo:0.40%, Mg:0.03%, RE0.07%, Sb:0.006%, Bi:0.06%, Ni:0.70%, La:0.03%, surplus is iron.
Preparation method: (1) Smelting of iron: alloy raw material such as the preparation pig iron, ferromanganese etc., medium-frequency induction furnace adds hot smelting, treats that iron liquid is heated to 1490 DEG C and comes out of the stove;
(2) iron liquid spheroidization and inoculation process: adopt and pour method spheroidization and inoculation technique, FeSiMg7RE type rare earth magnesium nodularizer is placed in after bottom casting ladle, after covering HY-75Ba3 type nucleating agent above it, finally pouring iron liquid, spheroidization and inoculation 36 seconds obtained ductile iron liquid; Poured into when temperature 1360 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, 32 seconds durations of pouring, shaping cooling, forms foundry goods.Obtain the ductile cast iron material of truck hub of the present invention.Performance is in table 1.
Table 1 embodiment performance
Embodiment 4
Formula (composition and mass percent): C:3.33%, Si:2.72%, Mn:0.62%, S:0.016%, P:0.015%, Cu:0.45%, Cr:0.38%, Mg:0.024%, RE:0.06%, Bi:0.035%, Ni0.34%, La:0.013%, surplus is iron.
Preparation method: (1) Smelting of iron: alloy raw material such as the preparation pig iron, ferromanganese etc., medium-frequency induction furnace adds hot smelting, treats that iron liquid is heated to 1550 DEG C and comes out of the stove;
(2) iron liquid spheroidization and inoculation process: adopt and pour method spheroidization and inoculation technique, FeSiMg7RE type rare earth magnesium nodularizer is placed in after bottom casting ladle, after covering HY-75Ba3 type nucleating agent above it, finally pouring iron liquid, spheroidization and inoculation 40 seconds obtained ductile iron liquid; Poured into when temperature 1420 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, 40 seconds durations of pouring, shaping cooling, forms foundry goods.Obtain the ductile cast iron material of truck hub of the present invention.
Embodiment 5
Formula (composition and mass percent): C:3.10%, Si:2.72%, Mn:0.61%, S:0.008%, P:0.015%, Cu:0.43%, Cr:0.41%, Mo:0.39%, Mg:0.024%, RE:0.06%, Sb:0.005%, Bi:0.042%, La:0.016%, surplus is iron.
Preparation method: (1) Smelting of iron: alloy raw material such as the preparation pig iron, ferromanganese etc., medium-frequency induction furnace adds hot smelting, treats that iron liquid is heated to 1470 DEG C and comes out of the stove;
(2) iron liquid spheroidization and inoculation process: adopt and pour method spheroidization and inoculation technique, FeSiMg7RE type rare earth magnesium nodularizer is placed in after bottom casting ladle, after covering HY-75Ba3 type nucleating agent above it, finally pouring iron liquid, spheroidization and inoculation 35 seconds obtained ductile iron liquid; Poured into when temperature 1370 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, 35 seconds durations of pouring, shaping cooling, forms foundry goods.Obtain the ductile cast iron material of truck hub of the present invention.
Embodiment 6
Formula (composition and mass percent): C:3.38%, Si:3.06%, Mn:0.52%, S:0.009%, P:0.018%, Cr:0.35%, Cu:0.42%, Mg:0.022%, RE:0.055%, Bi:0.032%, La:0.023%, surplus is iron.
Preparation method: (1) Smelting of iron: alloy raw material such as the preparation pig iron, ferromanganese etc., medium-frequency induction furnace adds hot smelting, treats that iron liquid is heated to 1520 DEG C and comes out of the stove;
(2) iron liquid spheroidization and inoculation process: adopt and pour method spheroidization and inoculation technique, FeSiMg7RE type rare earth magnesium nodularizer is placed in after bottom casting ladle, after covering HY-75Ba3 type nucleating agent above it, cover a little raw scrap material again to compress, finally pouring iron liquid, spheroidization and inoculation 38 seconds obtained ductile iron liquid; Poured into when temperature 1360 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, 38 seconds durations of pouring, shaping cooling, forms foundry goods.Obtain the ductile cast iron material of truck hub of the present invention.
Embodiment 7
Formula (composition and mass percent): C:2.50%, Si:2.20%, Mn:0.45%, S:0.001%, P:0.004%, Cr:0.30%, Cu:0.35%, Mg:0.02%, RE:0.048%, Bi:0.016%, La:0.015%, surplus is iron.
Preparation method: (1) Smelting of iron: alloy raw material such as the preparation pig iron, ferromanganese etc., medium-frequency induction furnace adds hot smelting, treats that iron liquid is heated to 1545 DEG C and comes out of the stove;
(2) iron liquid spheroidization and inoculation process: adopt and pour method spheroidization and inoculation technique, FeSiMg7RE type rare earth magnesium nodularizer is placed in after bottom casting ladle, after covering HY-75Ba3 type nucleating agent above it, finally pouring iron liquid, spheroidization and inoculation 36 seconds obtained ductile iron liquid; Poured into when temperature 1395 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, 39 seconds durations of pouring, shaping cooling, forms foundry goods.Obtain the ductile cast iron material of truck hub of the present invention.
Embodiment 8
Formula (composition and mass percent): C:3.60%, Si:3.20%, Mn:1.20%, S:0.02%, P:0.03%, Cr:0.5%, Cu0.55%, Mg:0.04%, RE:0.08%, Bi:0.06%, La:0.05%, surplus is iron.
Preparation method: (1) Smelting of iron: alloy raw material such as the preparation pig iron, ferromanganese etc., medium-frequency induction furnace adds hot smelting, treats that iron liquid is heated to 1500 DEG C and comes out of the stove;
(2) iron liquid spheroidization and inoculation process: adopt and pour method spheroidization and inoculation technique, FeSiMg7RE type rare earth magnesium nodularizer is placed in after bottom casting ladle, after covering HY-75Ba3 type nucleating agent above it, cover a little raw scrap material again to compress, finally pouring iron liquid, spheroidization and inoculation 40 seconds obtained ductile iron liquid; Poured into when temperature 1380 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, 36 seconds durations of pouring, shaping cooling, forms foundry goods.Obtain the ductile cast iron material of truck hub of the present invention.
Above illustrated embodiment is better embodiment of the present invention, only be used for conveniently the present invention being described, not any pro forma restriction is done to the present invention, have in any art and usually know the knowledgeable, if do not depart from the present invention carry in the scope of technical characteristic, utilize the Equivalent embodiments that the done local of disclosed technology contents is changed or modified, and do not depart from technical characteristic content of the present invention, all still belong in the scope of the technology of the present invention feature.
Claims (9)
1. a truck hub ductile cast iron material, is characterized in that, this material mainly comprises the Chemical Composition of following mass percent: C:2.50 ~ 3.60%, Si:2.20 ~ 3.20%, Mn:0.45 ~ 1.20%, S :≤0.02%, P :≤0.03%, Cr:0.30 ~ 0.5%, Cu:0.35 ~ 0.55%, Mg:0.02 ~ 0.04%, RE:0.04 ~ 0.08%, Bi:0.01 ~ 0.06%, La:0.01 ~ 0.05%, surplus is iron.
2. truck hub ductile cast iron material according to claim 1, is characterized in that, this material mainly comprises Chemical Composition C:3.0 ~ 3.5% of following mass percent, Si:2.5 ~ 3.10%, Mn:0.50 ~ 1.10%, S :≤0.02%, P :≤0.03%, Cr:0.32 ~ 0.45%, Cu:0.40 ~ 0.45%, Mg:0.02 ~ 0.03%, RE:0.04 ~ 0.07%, Bi:0.03 ~ 0.06%, La:0.01 ~ 0.03%, surplus is iron.
3. truck hub ductile cast iron material according to claim 1 and 2, is characterized in that, this material also comprises the Chemical Composition of following mass percent: Mo:0.35 ~ 0.40%, Sb:0.002 ~ 0.006%.
4. truck hub ductile cast iron material according to claim 3, is characterized in that, this material also comprises the Chemical Composition of following mass percent: Mo:0.36 ~ 0.40%, Sb:0.004 ~ 0.006%.
5. truck hub ductile cast iron material according to claim 1 and 2, is characterized in that, this material also comprises the Chemical Composition of following mass percent: Ni:0.2 ~ 0.8%.
6. truck hub ductile cast iron material according to claim 5, is characterized in that, this material also comprises the Chemical Composition of following mass percent: Ni:0.25 ~ 0.70%.
7. a preparation method for truck hub ductile cast iron material, is characterized in that, the method comprises the steps:
(1) Smelting of iron: according to the good starting material of formulated, the starting material prepared are placed in medium-frequency induction furnace and add hot smelting, come out of the stove when iron liquid is heated to 1470 ~ 1550 DEG C;
(2) spheroidization and inoculation: adopt and pour method spheroidization and inoculation, nodulizing agent is placed in after bottom casting ladle, coverage inoculator above it, finally pours iron liquid again, spheroidization and inoculation 35 ~ 40 seconds obtained ductile iron liquid; Poured into when temperature 1360 ~ 1420 DEG C by above-mentioned ductile iron liquid in the sand mold adopting consecutive solidification principle to make in advance, the duration of pouring is 30 ~ 40 seconds, forms foundry goods after shaping cooling.
8. the preparation method of a kind of truck hub ductile cast iron material according to claim 7, is characterized in that, the nodulizing agent described in step (2) is FeSiMg7RE nodulizing agent, and add-on is 1.0 ~ 1.5% of raw material total mass.
9. the preparation method of a kind of truck hub ductile cast iron material according to claim 7, is characterized in that, the nucleating agent described in step (2) is HY-75Ba3 nucleating agent, and add-on is 0.5 ~ 1.2% of raw material total mass.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510650716.0A CN105154760B (en) | 2015-10-09 | 2015-10-09 | A kind of truck hub ductile cast iron material and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105838975A (en) * | 2016-05-13 | 2016-08-10 | 北汽福田汽车股份有限公司 | Nodular cast iron and preparation method and application thereof |
| CN106947912A (en) * | 2017-04-26 | 2017-07-14 | 含山县朝霞铸造有限公司 | A kind of austempering ductile iron and its casting method |
| CN110819882A (en) * | 2018-08-08 | 2020-02-21 | 马鞍山市晓春模具材料有限公司 | Novel composite material suitable for automobile wheel hub mold |
| CN113736947A (en) * | 2021-09-07 | 2021-12-03 | 襄阳金耐特机械股份有限公司 | Preparation method of nodular cast iron |
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| SU1435648A1 (en) * | 1987-03-06 | 1988-11-07 | Производственное Объединение "Гомсельмаш" | High-strength cast iron |
| SU1444388A1 (en) * | 1987-05-28 | 1988-12-15 | Днепропетровский Проектно-Конструкторский Технологический Институт | Cast iron |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105838975A (en) * | 2016-05-13 | 2016-08-10 | 北汽福田汽车股份有限公司 | Nodular cast iron and preparation method and application thereof |
| CN106947912A (en) * | 2017-04-26 | 2017-07-14 | 含山县朝霞铸造有限公司 | A kind of austempering ductile iron and its casting method |
| CN106947912B (en) * | 2017-04-26 | 2018-11-16 | 含山县朝霞铸造有限公司 | A kind of austempering ductile iron and its casting method |
| CN110819882A (en) * | 2018-08-08 | 2020-02-21 | 马鞍山市晓春模具材料有限公司 | Novel composite material suitable for automobile wheel hub mold |
| CN113736947A (en) * | 2021-09-07 | 2021-12-03 | 襄阳金耐特机械股份有限公司 | Preparation method of nodular cast iron |
| CN113736947B (en) * | 2021-09-07 | 2022-08-09 | 襄阳金耐特机械股份有限公司 | Preparation method of nodular cast iron |
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|---|---|
| CN105154760B (en) | 2017-11-10 |
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