CN108004460A - A kind of high-intensity and high-tenacity as cast condition QT800-5 spheroidal graphite cast-iron and its production method - Google Patents
A kind of high-intensity and high-tenacity as cast condition QT800-5 spheroidal graphite cast-iron and its production method Download PDFInfo
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- CN108004460A CN108004460A CN201711361525.8A CN201711361525A CN108004460A CN 108004460 A CN108004460 A CN 108004460A CN 201711361525 A CN201711361525 A CN 201711361525A CN 108004460 A CN108004460 A CN 108004460A
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The method of the spheroidal graphite cast-iron is molded the present invention relates to a kind of 5 spheroidal graphite cast-iron of high-intensity and high-tenacity as cast condition QT800 and using common clay sand, this method is using nodular pig iron, carbon steel scrap and foundry returns as raw material, add the alloys such as suitable copper, molybdenum, nickel, antimony or tin, using electric induction furnace melting iron liquid, using rare earth magnesium ferrosilicon alloy as nodulizer, inoculation is carried out using ferrosilicon, silicon barium and silicon bismuth, with unselected clay sand molding on Slight Shock Squeeze, after pouring into a mould 30~60min, drawing to obtain the final product.The present invention can meet the needs of market is to high-strength and high ductility as cast condition 5 nodular iron castings of QT800, and particularly automobile industry is to the light-weighted demand of casting.
Description
Technical field
The present invention relates to metal casting and technical field of metal material, and in particular to a kind of high-intensity and high-tenacity as cast condition
QT800-5 spheroidal graphite cast-iron and the method that the spheroidal graphite cast-iron is molded using common clay sand.
Background technology
Nodular iron casting is since nineteen forty-seven comes out, because it is sent out rapidly with good mechanical property and casting character
Exhibition, it has also become important engineering material, is widely used in the industrial production.Standard GB/T/T1348- at present
2009《Nodular iron casting》Defined nodular iron casting shares 14 trades mark, and the product of these trades mark generally has low-intensity Gao Yan
The characteristics of stretching rate or high intensity low elongation, although being widely used in every field and being made that for the national economic development
Tremendous contribution, but with the quick hair of the fast development of China's economy and the continuous improvement of scientific and technological level, particularly auto industry
Exhibition, commercial car develop towards heavy duty, high speed, low energy consumption direction, and the unloaded light-weighted demand of automobile is continuously increased, and has expedited the emergence of automobile
Demand of the parts to high-intensity and high-tenacity cast condition ductile iron part.
For requiring high intensity, high tenacity and the casting of high fatigue property, the ductile cast iron material performance of traditional national standard is
It cannot meet the requirements.The comprehensive mechanical property of spheroidal graphite cast-iron is improved, there is high elongation again while making it have higher-strength
Rate, creates condition, so as to meet auto parts and components while increasing product reliability to expand the application range of spheroidal graphite cast-iron
Lightweight demand.Therefore, the research and technology exploitation of high intensity, high elongation rate cast condition ductile iron, has been a concern.At present
The GF companies that the research and development of such external product only have Switzerland form tandem product, are in the popularization and application stage.China is to height
The research of strength high toughness cast condition ductile iron is at the early-stage, and there is presently no the standard work that can meet industrialized mass production
Skill.
Application artificially meets the market requirement, and explores high-end nodular iron casting market actively, is directed to by cooperation by production, study and research
The research and development of high-strength and high ductility cast condition ductile iron part.The present invention is multiple using alloying element regulation and control matrix, trace element
Close toughening technology, under different cooling control spheroidal graphite cast-iron microstructure, realize under as-cast condition industrialize stablize,
Produce high-intensity and high-tenacity as cast condition QT800-5 nodular iron castings.
The content of the invention
It is an object of the invention to provide a kind of high-intensity and high-tenacity as cast condition QT800-5 ductile cast iron materials and its industrialization
Steady production method, the technique can utilize unselected clay sand molding on common mo(u)lding line, it is high-strength to industrialize stable production
High tenacity as cast condition QT800-5 nodular iron castings are spent, meet the light-weighted requirement of auto parts and components.To achieve the above object, this hair
Technical solution is as follows used by bright：
A kind of high-intensity and high-tenacity as cast condition QT800-5 spheroidal graphite cast-iron, its component include by percentage to the quality：C 3.40%
~3.90%, Si 2.30%~3.0%, Mn ＜ 0.30%, P ＜ 0.04%, S≤0.02%, Cu 0.50%~1.20%, Mo
＜ 0.30%, Sb ＜ 0.02%, Bi ＜ 0.01%, surplus are iron and a small amount of impurity.
According to such scheme, 0.50%~1.50% Ni is further included in the cast condition ductile iron and less than 0.03%
Sn。
The method of above-mentioned high-intensity and high-tenacity as cast condition QT800-5 spheroidal graphite cast-iron is molded using common clay sand, including it is following
Step：
(a) melting is carried out by raw material of the pig iron, carbon steel scrap and magnesium iron foundry returns, analyzes and adjust when close to tapping temperature
Whole dispensing makes component qualified, and 5~8min, iron liquid of skimming out are stood at 1500 DEG C~1520 DEG C；
(b) FeSiMg8Re5 nodulizers, ferrosilicon, molybdenum-iron and fine copper rod are added into the pit of dam-type casting ladle, every layer is smash
Covering perlite, satisfactory iron liquid in stove is poured in nodularization bag after plain, slag making slagging-off after spheroidizing reacion, then
Ladle-to-ladle inoculation, adds SiBa and Sb or SiBa and Sn composite inoculants during ladle-to-ladle, and it is precious to be sufficiently stirred iron liquid capping
It is stand-by after Zhu Yan；
(c) unselected clay sand molding is utilized, the pure iron liquid after spheroidization and inoculation is hung in pouring position is poured into a mould, during which
SiBi inovulants are added with stream, are finally unpacked.
According to such scheme, the pig iron used in step (a) is specially the Q12 pig iron, its component is：C 3.60%~
3.90%, Si 2.30%~2.8%, Mn ＜ 0.30%, P ＜ 0.04%, S≤0.02%, Cu 0.50%~1.20%, Mo ＜
0.30%, Sb ＜ 0.02%, surplus are iron.
According to such scheme, FeSiMg8Re5 nodulizers, the 0.5%- of 1.2%-1.6% are sequentially added in step (b)
The fine copper rod of 1.1% 75 ferrosilicon, 0.42% 60 molybdenum-irons and 0.7%-1%.
According to such scheme, the addition of SiBa is that the addition of 0.35%, Sb or Sn is low in step (b) composite inoculant
In 0.03%, SiBi inovulants addition be 0.25%.
According to such scheme, it is also added into step (b) while nodulizer, ferrosilicon, molybdenum-iron, fine copper rod is added
0.50%~1.50% pure Ni.
According to such scheme, common clay sand is loaded into the moulding on Slight Shock Squeeze after sandbox, type in step (c)
The hardness of chamber controls the 30-60min after the completion of 75-85, casting to unpack.
Compared with prior art, the invention has the advantages that：
(1) the high-intensity and high-tenacity cast condition ductile iron tensile strength Rm >=800MPa being prepared, elongation percentage A >=5%,
Metallographic structure is：1~2 grade of nodulizing grade, 6~7 grades of sphere diameter size, content of pearlite in alloy 60%~80%.
(2) moulding is carried out using common clay sand, applied widely, single-piece, small lot and mass production can meet；
Productive temp is grown, and needs more than 45min from drawing is poured into, and sand mold insulating power is strong, immediate quenching can be made full use of to realize
As cast condition produces.
(3) using Si elements regulation and control ferrite content, and using the alloying action reinforced ferrite matrix of Si, so as to carry
The obdurability of high magnesium iron；Regulate and control content of pearlite in alloy using Cu-Mo-Ni alloyings, stablize and refine pearlitic structrure, strengthen matrix
Tissue, improves the intensity of magnesium iron；Using micro- Sb, Sn, Bi composite refining graphite nodule, Shake-out Time control casting is utilized
Cooling velocity.
Brief description of the drawings
Fig. 1 is the micro-organization chart of high-intensity and high-tenacity cast condition ductile iron made from the embodiment of the present invention 3.
Embodiment
To make those of ordinary skill in the art fully understand technical scheme and beneficial effect, below in conjunction with specific
Embodiment is further described.
Embodiment 1
Unselected clay green-sand is inserted into the moulding on Slight Shock Squeeze after sandbox, the hardness average value control of sand mold
82 or so.Raw material use the Q12 pig iron, its component is (mass fraction, similarly hereinafter)：C 3.60%~3.90%, Si 2.30%
~2.8%, Mn ＜ 0.30%, P ＜ 0.04%, S≤0.02%, Cu 0.50%~1.20%, Mo ＜ 0.30%, Sb ＜
0.02%, surplus is iron.Using electric induction furnace melting, period analysis adjustment dispensing makes component qualified, is finally warming up to 1520 DEG C
5~8min of standing, which skims, to come out of the stove.Sequentially added in nodularization bag 1.3% FeSiMg8Re5 nodulizers, 0.65% 75 ferrosilicon,
0.42% 60 molybdenum-irons and 0.8% fine copper rod, every layer is smash plain rear covering perlite, and iron liquid in stove then is poured nodularization bag
It is interior, ladle-to-ladle inoculation is carried out after slag making slagging-off, the composite inoculant (SiBa being made of SiBa, Sb is added during ladle-to-ladle
Addition 0.35%, Sb additions 0.025%), it is stand-by to be sufficiently stirred capping perlite after iron liquid scratches clean scum silica frost.By spheroidization and inoculation
Pure iron liquid afterwards hangs in pouring position and is poured into a mould, add during cast SiBi inovulants (addition 0.25%) carry out it is pregnant with flowing
Educate, drawing is cleared up after 30min is cooled down.
The attached casting Y types test block of the present embodiment production detects gained technical indicator：2 grades of nodulizing grade, graphite size 6~7
Level, content of pearlite in alloy are 65~70%；Mechanical property：Tensile strength 816~829MPa of Rm, elongation percentage A 5.8~7.2%.
Embodiment 2
The present embodiment other steps, parameter are identical with embodiment 1, and difference is：It will subcontract in inovulant
Sb is substituted with Sn, and Sn ＜ 0.03%；The addition of nodulizer changes：1.4% FeSiMg8Re5 nodulizers, 0.76%
75 ferrosilicon, 0.42% 60 molybdenum-irons and 0.7% fine copper rod.
The present embodiment production attached casting Y types test block technical indicator be：2 grades of nodulizing grade, 6~7 grades of graphite size, pearlite
Content is 65~70%；Mechanical property：Tensile strength Rm814~816MPa, elongation percentage A5.6~6.8%.
Embodiment 3
The present embodiment other steps, parameter are identical with embodiment 1, and difference is：It will subcontract in inovulant
Sb is substituted with Sn, and Sn ＜ 0.03%；The addition of nodulizer changes：1.5% FeSiMg8Re5 nodulizers, 0.95%
75 ferrosilicon, 0.42% 60 molybdenum-irons, 1% fine copper rod and 1% Ni.
The present embodiment production attached casting Y types test block technical indicator be：2 grades of nodulizing grade, 6~7 grades of graphite size is (see attached drawing
1 is right), content of pearlite in alloy is 65~70% (left see attached drawing 1)；Mechanical property：Tensile strength 809~829MPa of Rm, elongation percentage A
5.4~7.0%.
Claims (8)
1. a kind of high-intensity and high-tenacity as cast condition QT800-5 spheroidal graphite cast-iron, it is characterised in that the component of the cast condition ductile iron is with matter
Amount percentages include：C 3.40%~3.90%, Si 2.30%~3.0%, Mn ＜ 0.30%, P ＜ 0.04%, S≤
0.02%, Cu 0.50%~1.20%, Mo ＜ 0.30%, Sb ＜ 0.02%, Bi ＜ 0.01%, surplus are iron and a small amount of impurity.
A kind of 2. high-intensity and high-tenacity as cast condition QT800-5 spheroidal graphite cast-iron according to claim 1, it is characterised in that：The casting
0.50%~1.50% Ni and Sn less than 0.03% is further included in state spheroidal graphite cast-iron.
A kind of 3. method using common clay sand formed high-strength high tenacity as cast condition QT800-5 spheroidal graphite cast-iron, it is characterised in that
Comprise the following steps：
(a) melting is carried out by raw material of the pig iron, carbon steel scrap and magnesium iron foundry returns, analysis and regulation is matched somebody with somebody when close to tapping temperature
Material makes component qualified, and 5~8min, iron liquid of skimming out are stood at 1500 DEG C~1520 DEG C；
(b) add FeSiMg8Re5 nodulizers, ferrosilicon, molybdenum-iron and fine copper rod into the pit of dam-type casting ladle, every layer smash it is plain
After cover perlite, satisfactory iron liquid in stove is poured in nodularization bag, after spheroidizing reacion slag making remove the gred, then it is ladle-to-ladle
Inoculation, SiBa and Sb composite inoculants or SiBa and Sn composite inoculants are added during ladle-to-ladle, is sufficiently stirred iron
It is stand-by after liquid capping perlite；
(c) unselected clay sand molding is utilized, the pure iron liquid after spheroidization and inoculation is hung in pouring position is poured into a mould, during which with stream
SiBi inovulants are added, are finally unpacked.
4. one kind according to claim 3 is cast using common clay sand formed high-strength high tenacity as cast condition QT800-5 spheroidal graphites
The method of iron, it is characterised in that：The pig iron used in step (a) is specially the Q12 pig iron, its component is：C 3.60%~
3.90%, Si 2.30%~2.8%, Mn ＜ 0.30%, P ＜ 0.04%, S≤0.02%, Cu 0.50%~1.20%, Mo ＜
0.30%, Sb ＜ 0.02%, surplus are iron.
5. one kind according to claim 3 is cast using common clay sand formed high-strength high tenacity as cast condition QT800-5 spheroidal graphites
The method of iron, it is characterised in that：FeSiMg8Re5 nodulizers, the 0.5%- of 1.2%-1.6% is sequentially added in step (b)
The fine copper rod of 1.1% 75 ferrosilicon, 0.42% 60 molybdenum-irons and 0.7%-1%.
6. one kind according to claim 3 is cast using common clay sand formed high-strength high tenacity as cast condition QT800-5 spheroidal graphites
The method of iron, it is characterised in that：The addition of SiBa is that the addition of 0.35%, Sb or Sn is low in step (b) composite inoculant
In 0.03%, SiBi inovulants addition be 0.25%.
7. one kind according to claim 3 is cast using common clay sand formed high-strength high tenacity as cast condition QT800-5 spheroidal graphites
The method of iron, it is characterised in that：It is also added into step (b) while nodulizer, ferrosilicon, molybdenum-iron, fine copper rod is added
0.50%~1.50% pure Ni.
8. one kind according to claim 3 is cast using common clay sand formed high-strength high tenacity as cast condition QT800-5 spheroidal graphites
The method of iron, it is characterised in that：By the moulding on Slight Shock Squeeze after common clay sand loading sandbox, type in step (c)
The hardness of chamber controls the 30-60min after the completion of 75-85, casting to unpack.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108950371A (en) * | 2018-08-09 | 2018-12-07 | 常州钜苓铸造有限公司 | High-performance nodular cast iron and its production method |
| CN108977725A (en) * | 2018-08-09 | 2018-12-11 | 常州钜苓铸造有限公司 | High-performance cast pearlite ductile iron and its production method |
| CN109355454A (en) * | 2018-12-20 | 2019-02-19 | 湖北丹江口志成铸造股份有限公司 | A kind of high-intensity and high-tenacity as cast condition QT700-8 nodular iron casting and its production technology |
| CN110280711A (en) * | 2019-08-06 | 2019-09-27 | 东风精密铸造有限公司 | A method of hot investment casting high performance ductile iron is produced using low-carbon waste steel |
| CN110280712A (en) * | 2019-08-06 | 2019-09-27 | 东风精密铸造有限公司 | A kind of precision-investment casting spheroidal graphite cast-iron QT700-8 production method |
| CN110408837A (en) * | 2019-07-22 | 2019-11-05 | 共享装备股份有限公司 | High-strength tenacity ductile cast iron material and preparation method thereof |
| CN111206182A (en) * | 2020-02-22 | 2020-05-29 | 中国第一汽车股份有限公司 | Preparation method of low-alloy nodular cast iron for mold |
| CN113106184A (en) * | 2021-03-29 | 2021-07-13 | 宜昌船舶柴油机有限公司 | Casting method of high-carbon low-silicon titanium-free vermicular graphite cast iron material |
| CN113151731A (en) * | 2021-04-23 | 2021-07-23 | 湖北普尔精密科技有限公司 | High-strength high-plasticity as-cast QT700-10 nodular cast iron and production method thereof |
| CN113737085A (en) * | 2021-09-07 | 2021-12-03 | 襄阳金耐特机械股份有限公司 | Nodular cast iron axle housing and manufacturing method thereof |
| CN114058936A (en) * | 2021-10-22 | 2022-02-18 | 一汽解放汽车有限公司 | Nodular cast iron and preparation method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108950371A (en) * | 2018-08-09 | 2018-12-07 | 常州钜苓铸造有限公司 | High-performance nodular cast iron and its production method |
| CN108977725A (en) * | 2018-08-09 | 2018-12-11 | 常州钜苓铸造有限公司 | High-performance cast pearlite ductile iron and its production method |
| CN109355454A (en) * | 2018-12-20 | 2019-02-19 | 湖北丹江口志成铸造股份有限公司 | A kind of high-intensity and high-tenacity as cast condition QT700-8 nodular iron casting and its production technology |
| CN110408837A (en) * | 2019-07-22 | 2019-11-05 | 共享装备股份有限公司 | High-strength tenacity ductile cast iron material and preparation method thereof |
| CN110280711A (en) * | 2019-08-06 | 2019-09-27 | 东风精密铸造有限公司 | A method of hot investment casting high performance ductile iron is produced using low-carbon waste steel |
| CN110280712A (en) * | 2019-08-06 | 2019-09-27 | 东风精密铸造有限公司 | A kind of precision-investment casting spheroidal graphite cast-iron QT700-8 production method |
| CN111206182A (en) * | 2020-02-22 | 2020-05-29 | 中国第一汽车股份有限公司 | Preparation method of low-alloy nodular cast iron for mold |
| CN113106184A (en) * | 2021-03-29 | 2021-07-13 | 宜昌船舶柴油机有限公司 | Casting method of high-carbon low-silicon titanium-free vermicular graphite cast iron material |
| CN113106184B (en) * | 2021-03-29 | 2022-09-06 | 宜昌船舶柴油机有限公司 | Casting method of high-carbon low-silicon titanium-free vermicular graphite cast iron material |
| CN113151731A (en) * | 2021-04-23 | 2021-07-23 | 湖北普尔精密科技有限公司 | High-strength high-plasticity as-cast QT700-10 nodular cast iron and production method thereof |
| CN113737085A (en) * | 2021-09-07 | 2021-12-03 | 襄阳金耐特机械股份有限公司 | Nodular cast iron axle housing and manufacturing method thereof |
| CN114058936A (en) * | 2021-10-22 | 2022-02-18 | 一汽解放汽车有限公司 | Nodular cast iron and preparation method thereof |
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