CN107142416A - A kind of method of production of wind-powered electricity generation high-strength and high ductility spheroidal graphite cast-iron - Google Patents
A kind of method of production of wind-powered electricity generation high-strength and high ductility spheroidal graphite cast-iron Download PDFInfo
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- CN107142416A CN107142416A CN201710152436.6A CN201710152436A CN107142416A CN 107142416 A CN107142416 A CN 107142416A CN 201710152436 A CN201710152436 A CN 201710152436A CN 107142416 A CN107142416 A CN 107142416A
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- iron
- spheroidal graphite
- graphite cast
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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
-
- 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
- C21C1/105—Nodularising additive agents
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a kind of method of production of wind-powered electricity generation with high-strength and high ductility spheroidal graphite cast-iron, comprise the following steps：Step 1: melting charge composition, is specially：The pig iron：Steel scrap：Foundry returns=40% 60%:15% 30%:15% 30%, while adding a certain amount of 75 ferrosilicon in stove；Step 2: being sequentially added in a hole of nodularization bag：1% spheroidal graphite cast iron nodularizer, 0.2% 0.4% high calcium barium inovulant, 30 60g/t Sb and foundary weight；Step 3: molten iron is poured into from stove in another hole, 0.1% 0.2% random inoculant is added during cast, pouring temperature is 1350 DEG C.The present invention eliminates the tendency for the chunky graphite that high silicon ribbon comes by the control to nodulizer and trace element.Body mechanical property preferably provides prerequisite.So as to keep, 20 DEG C of low-temperature impacts are more than 12J and elongation percentage is more than on the premise of 18%, improve intensity.
Description
Technical field
The invention belongs to field of metallurgy, and in particular to a kind of method of production of wind-powered electricity generation high-strength and high ductility spheroidal graphite cast-iron.
Background technology
As Technology for Modern Equipment develops to lightweight, energy-conservation, efficient direction, people are to the intensity of magnesium iron and performance
It is required that also improving constantly.Therefore, casting and metallargist generally use casting alloy, or are reached by Technology for Heating Processing
To the purpose for improving magnesium iron mechanical performance.But, the former during Ductile Iron Casting because needing the expensive alloying element of addition (such as
Ti, Cu etc.), greatly increase the production cost of G. Iron Castings, this greatly weakens the cheap market advantage of G. Iron Castings；The latter consumes
When, power consumption the drawbacks of ductile iron production is lost the competitiveness of the market development.Moreover, magnesium iron is compared with steel alloy poor toughness, current ball
The raising of iron reinforcing means On Impact Toughness is very limited.
After ISO1083/JS spheroidal graphite cast-iron Standards Publications in 2004, the ball again supplemented with an ISO1083/JS/500-10
Elongation, is brought up to 10% by black cast iron standard from original 7%.The spheroidal graphite cast-iron standard in March, 2012, Germany and Europe
It is EN-GJS-450-18, EN-GJS-500-14, EN-GJS- respectively that DIN-EN1563 adds 3 trades mark again in modification
600-10, that is, greatly improved ferrite, the yield strength of pearlite mixed matrix spheroidal graphite cast-iron and elongation, and these levels
It can all not obtained in as cast condition, it is not necessary to any heat treatment.What they walked is that the w (si) improved in composition is measured, carried out reinforced ferrite
Technology path.
In order to meet the working environment of wind power casting, the mechanical property of wind-powered electricity generation low-temperature impact is reached, too high silicon is clearly
It is inappropriate.At the same time too high silicon is for thick big wind power casting or unfavorable, and it can promote ferrite and graphite
Formed, so as to aggravate the deterioration of cast-internal graphite form.
It is low with its wear-resisting, vibration damping and production cost since spheroidal graphite cast-iron comes out and put into production from last century the forties
Honest and clean the advantages of, has obtained swift and violent development.So far, magnesium iron is in various fields such as automobile, mine, ship, injection machine, lathes
It is used widely.As people are to sustainable, regenerative resource understanding, wind-power electricity generation turns into focus of concern.With
This requirement of wind-powered electricity generation manufacturer to wind power casting simultaneously is also further improved, and is not sticking to original trade mark EN-GJS-400-
18U-LT。
The content of the invention
Goal of the invention：In order to solve the deficiencies in the prior art, cast the invention provides a kind of wind-powered electricity generation with high-strength and high ductility spheroidal graphite
The method of production of iron.
Technical scheme：A kind of wind-powered electricity generation method of production of high-strength and high ductility spheroidal graphite cast-iron, comprises the following steps：
Step 1: melting charge composition, is specially：The pig iron：Steel scrap：Foundry returns=40%-60%:15%-30%:
15%-30%, while adding a certain amount of 75 ferrosilicon in stove, makes the silicon of base iron reach 1.8%；
Step 2: being sequentially added in a hole of nodularization bag：1% spheroidal graphite cast iron nodularizer, 0.2%-0.4% high calciums
The Sb and foundary weight of barium inovulant, 30-60g/t；
Step 3: molten iron is poured into from stove in another hole, 0.1-0.2% random inoculant is added during cast, is poured
It is 1340 DEG C -1380 DEG C to note temperature.
It is used as optimization：The spheroidal graphite cast iron nodularizer is made up of following weight percent composition：Si：40%-50%, Ca：
0.9%-1.3%, Ba：1%-1.5%, Mg：5.8%-6.2%, Re：0.8%-1.0%, Al<1.2%, surplus be Fe and
Inevitably micro-, granularity is 5-30mm.
It is used as optimization：The high calcium barium inovulant is made up of following weight percent composition：Si：72%-75%, Ca：
1%-2%, Ba：2%-2.5%, Al<2%, surplus is Fe and inevitably micro-, and granularity is 3-8mm.
It is used as optimization：The random inoculant is made up of following weight percent composition：Si：70%-76%, Ca：
0.75%-1.25%, Re：1.5%-4%, Al：0.75%-1.25%, surplus is Fe and inevitably micro-, grain
Spend for 0.1-1mm.
Beneficial effect：The present invention eliminates the chunky graphite that high silicon ribbon comes by the control to nodulizer and trace element
Tendency.Graphite form is good, does not also occur obvious chunky graphite on the thick and large section of modulus 5.Preferably
Body mechanical property provides prerequisite.Keep -20 DEG C of low-temperature impacts more than 12J and elongation percentage be more than on the premise of 18%,
Improve intensity.Attached casting test block mechanical property by cube has reached QT420-18 performance, and -20 DEG C of V breach low temperature punching
Impact 13J.
Brief description of the drawings
Fig. 1 is test cube foundary methods drawing in the present invention；
Fig. 2 test cubes cut schematic diagram
Fig. 3 is the placement schematic diagram of alloy in nodularization bag in the present invention；
Fig. 4 is the metallographic contrast schematic diagram of QT400-18 and QT420-18 in the present invention；
Fig. 5 is QT420-18 bodies metallographic (100 times) in the present invention；
QT420-18 impact fractures sem analysis (200 times) when Fig. 6 is -20 DEG C in the present invention；
QT400-18 impact fractures sem analysis (200 times) when Fig. 7 is -20 DEG C in the present invention.
Embodiment
With reference to specific embodiment, the invention will be further described.
Specific embodiment
The attached casting test block of existing cast wall thickness 300mm test cube and a thickness 70mm, cube modulus 5cm.
Casting technique below figure 1, using earthenware rising pouring technique, ceramic pipe diameter 30mm.In order to illustrate the superiority of this formula, pouring
While noting QT420-18, with existing QT400-18 one same test cube of molten iron casting.
As shown in Fig. 2 a kind of wind-powered electricity generation method of production of high-strength and high ductility spheroidal graphite cast-iron, comprises the following steps：
Step 1: melting charge composition, is specially：The pig iron：Steel scrap：Foundry returns=40%-60%:15%-30%:
15%-30%, while adding a certain amount of 75 ferrosilicon in stove；
Step 2: being sequentially added in a hole of nodularization bag：1% spheroidal graphite cast iron nodularizer, 0.2%-0.4% high calciums
The Sb and foundary weight of barium inovulant, 30-60g/t；
Step 3: molten iron is poured into from stove in another hole, 0.1%-0.2% random inoculant is added during cast,
Pouring temperature is 1340 DEG C -1380 DEG C.
The spheroidal graphite cast iron nodularizer is made up of following weight percent composition：Si：40%-50%, Ca：0.9%-
1.3%, Ba：1%-1.5%, Mg：5.8%-6.2%, Re：0.8%-1.0%, Al<1.2%, surplus is Fe and can not kept away
The trace element exempted from, granularity is 5-30mm.
The high calcium barium inovulant is made up of following weight percent composition：Si：72%-75%, Ca：1%-2%, Ba：
2%-2.5%, Al<2%, surplus is Fe and inevitably micro-, and granularity is 3-8mm.
The random inoculant is made up of following weight percent composition：Si：70%-76%, Ca：0.75%-1.25%,
Re：1.5%-4%, Al：0.75%-1.25%, surplus is Fe and inevitably micro-, and granularity is 0.1-1mm.
Attached casting test block mechanical property in this patent by cube has reached QT420-18 performance, and -20 DEG C of V breach
13J is got in low-temperature impact.Graphite form is good, does not also occur obvious chunky shape stone on the thick and large section of modulus 5
Ink.Body mechanical property preferably provides prerequisite.
1st, melting result
According to the molten iron of above-mentioned formula melting nodularization, hot metal composition such as table 1 below before and after nodularization, nodularization process outburst is intact,
The sulphur and magnesium of final molten iron are all in desired scope.Then 300mm test cubes are poured into a mould, after waiting cooling 1.5 days, are taken out.
Hot metal composition before and after the nodularization of table 1
2nd, attached casting test block mechanical property
This attached casting test block thickness 70mm, taken in attached casting test block a coupon, metallographic, three groups of impacts (test respectively-
20 DEG C, -30 DEG C, the V notched impact properties of room temperature).Mechanical property such as table 2 below, QT420-18 tensile strength is improved
32Mpa, yield tensile ratio is improved to 0.683, and stock utilization is improved.The low temperature impact properties of wind power casting are also met simultaneously, even if-
At 30 DEG C, its low-temperature impact is still above 12J.
The attached casting test block mechanical property of table 2
Metallograph to such as Fig. 4, by metallographic can obtain both graphite nodules all compare rounding, uniform, but graphite nodule number
There is notable difference.QT400-18 number of graphite ball is 180/mm2, and QT420-18 number of graphite ball is 230/mm2.This master
If because caused by effective inoculation caused by high Si.
3rd, body physicochemical property
It is that a piece of of 30mm is cooked Mechanics Performance Testing that test cube is removed into one piece of thickness from centre.In a piece of in centre
Take 3 metallographics, 3 coupons, 6 groups of impact cuttings, the distribution situation of observation graphite form and mechanical property on section, cutting side
Formula below figure 2.
Mechanical property such as table 3 below, compared with QT400-18, QT420-18 tensile strength improves 30Mpa or so, hardness
Improve 15HB.At the same time yield tensile ratio has also brought up to 0.67 from original 0.64, and this improves material to reducing casting thickness
Utilization rate is very helpful.QT420-18 low temperature impact properties, decrease from -20 DEG C to -30 DEG C.- 20 DEG C of low temperature
Impact value, which is met, to be required, -30 DEG C of cold impact value is slightly less than the 12J of requirement.
The 300mm test cube body mechanical properties of table 3
QT420-18 this body section metallographic is as shown in figure 5, from center to face, graphite form is deteriorated gradually.B graphite
Size is uneven, a small amount of big ball occurs, and in the sparse place of graphite nodule, occur in that a small amount of field trash.C place is occurred in that
A small amount of chunky graphite, tensile strength decreases, but its influence to low temperature impact properties is smaller.This is mainly due to iron
Caused by " recalescence " and a small amount of antimony element of addition when water cooling.
4th, SEM analysis
Fig. 6 and Fig. 7 be QT420-18 and QT400-18 at -30 DEG C, the SEM of the low-temperature impact fracture at middle and edge shines
Piece.As can be seen from the figure there is more dimple in QT400-18 centre and edge discontinuity, and surrounding has obvious tear
Matrix is drawn into dimple during rib explanation fracture, and around graphite nodule, dimple distribution uniform, shape is relatively regular, these dimples
Presence be higher impact toughness basic assurance.And QT420-18 edge, except dimple, is gone back due to the variation of graphite form
The river pattern of a part is occurred in that, and has obvious cleavage step, explanation is a kind of quasi-cleavage crack.This phenomenon be by
The ductile-brittle transition temperature of material is improved in the too high silicon amounts of QT420-18, casting handbook is recorded, and silicon often increases by 0.1%, tough crisp
Transition temperature improves 5.5 DEG C -6 DEG C.So that material is in the case of -30 DEG C, the Quasi cleavage stage is come into.
The present invention is not limited to above-mentioned preferred forms, and anyone can show that other are various under the enlightenment of the present invention
The product of form, however, make any change in its shape or structure, it is every that there is skill identical or similar to the present application
Art scheme, is within the scope of the present invention.
Claims (4)
1. a kind of wind-powered electricity generation method of production of high-strength and high ductility spheroidal graphite cast-iron, it is characterised in that：Comprise the following steps：
Step 1: melting charge composition, is specially：The pig iron：Steel scrap：Foundry returns=40%-60%:15%-30%:15%-
30%, while adding a certain amount of 75 ferrosilicon in stove；
Step 2: being sequentially added in a hole of nodularization bag：1% spheroidal graphite cast iron nodularizer, 0.2%-0.4% high calcium barium are pregnant
Educate agent, 30-60g/t Sb and foundary weight；
Step 3: molten iron is poured into from stove in another hole, 0.1%-0.2% random inoculant, cast are added during cast
Temperature is 1340 DEG C -1380 DEG C.
2. the wind-powered electricity generation according to claim 1 method of production of high-strength and high ductility spheroidal graphite cast-iron, it is characterised in that：The spheroidal graphite
Cast iron nodulizer is made up of following weight percent composition：Si：40%-50%, Ca：0.9%-1.3%, Ba：1%-1.5%,
Mg：5.8%-6.2%, Re：0.8%-1.0%, Al<1.2%, surplus is Fe and inevitably micro-, and granularity is
5-30mm。
3. the wind-powered electricity generation according to claim 1 method of production of high-strength and high ductility spheroidal graphite cast-iron, it is characterised in that：The high calcium
Barium inovulant is made up of following weight percent composition：Si：72%-75%, Ca：1%-2%, Ba：2%-2.5%, Al<2%,
Surplus is Fe and inevitably micro-, and granularity is 3-8mm.
4. the wind-powered electricity generation according to claim 1 method of production of high-strength and high ductility spheroidal graphite cast-iron, it is characterised in that：It is described with stream
Inovulant is made up of following weight percent composition：Si：70%-76%, Ca：0.75%-1.25%, Re：1.5%-4%, Al：
0.75%-1.25%, surplus is Fe and inevitably micro-, and granularity is 0.1-1mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710152436.6A CN107142416B (en) | 2017-03-15 | 2017-03-15 | A kind of method of production of wind-powered electricity generation high-strength and high ductility spheroidal graphite cast-iron |
| PCT/CN2017/115296 WO2018166247A1 (en) | 2017-03-15 | 2017-12-08 | Development method for high-strength and high-toughness nodular cast iron for wind electricity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710152436.6A CN107142416B (en) | 2017-03-15 | 2017-03-15 | A kind of method of production of wind-powered electricity generation high-strength and high ductility spheroidal graphite cast-iron |
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| CN107142416A true CN107142416A (en) | 2017-09-08 |
| CN107142416B CN107142416B (en) | 2018-08-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108277425A (en) * | 2018-03-12 | 2018-07-13 | 江苏吉鑫风能科技股份有限公司 | A kind of high silicon solid solution spheroidal graphite cast-iron and preparation method thereof |
| WO2018166247A1 (en) * | 2017-03-15 | 2018-09-20 | 江苏宏德特种部件股份有限公司 | Development method for high-strength and high-toughness nodular cast iron for wind electricity |
| CN111036859A (en) * | 2019-12-19 | 2020-04-21 | 唐山钢铁集团有限责任公司 | Spheroidizing inoculation treatment method for high-strength nodular cast iron roller |
| CN111876658A (en) * | 2020-09-04 | 2020-11-03 | 浙江坤博精工科技股份有限公司 | Casting method of mechanical arm of industrial robot |
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| CN107142416B (en) * | 2017-03-15 | 2018-08-21 | 江苏宏德特种部件股份有限公司 | A kind of method of production of wind-powered electricity generation high-strength and high ductility spheroidal graphite cast-iron |
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2017
- 2017-03-15 CN CN201710152436.6A patent/CN107142416B/en active Active
- 2017-12-08 WO PCT/CN2017/115296 patent/WO2018166247A1/en active Application Filing
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| CN102260819A (en) * | 2011-08-12 | 2011-11-30 | 南通宏德机电有限公司 | As-cast thick and large section pearlite based nodular cast iron material |
| CN103014219A (en) * | 2012-11-13 | 2013-04-03 | 南通宏德机电有限公司 | Control method of as-cast condition heavy section ferrite-based nodular iron casting graphite nodule and matrix structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018166247A1 (en) * | 2017-03-15 | 2018-09-20 | 江苏宏德特种部件股份有限公司 | Development method for high-strength and high-toughness nodular cast iron for wind electricity |
| CN108277425A (en) * | 2018-03-12 | 2018-07-13 | 江苏吉鑫风能科技股份有限公司 | A kind of high silicon solid solution spheroidal graphite cast-iron and preparation method thereof |
| CN111036859A (en) * | 2019-12-19 | 2020-04-21 | 唐山钢铁集团有限责任公司 | Spheroidizing inoculation treatment method for high-strength nodular cast iron roller |
| CN111036859B (en) * | 2019-12-19 | 2021-07-09 | 唐山钢铁集团有限责任公司 | Spheroidizing inoculation treatment method for high-strength nodular cast iron roller |
| CN111876658A (en) * | 2020-09-04 | 2020-11-03 | 浙江坤博精工科技股份有限公司 | Casting method of mechanical arm of industrial robot |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018166247A1 (en) | 2018-09-20 |
| CN107142416B (en) | 2018-08-21 |
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