CN106929747A - A kind of solution strengthening ferrite vermicular cast iron and its production method - Google Patents
A kind of solution strengthening ferrite vermicular cast iron and its production method Download PDFInfo
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- CN106929747A CN106929747A CN201710203048.6A CN201710203048A CN106929747A CN 106929747 A CN106929747 A CN 106929747A CN 201710203048 A CN201710203048 A CN 201710203048A CN 106929747 A CN106929747 A CN 106929747A
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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
-
- 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
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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
- C22C37/06—Cast-iron alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of solution strengthening ferrite vermicular cast iron and its production method, ferrite of its matrix comprising mass percent more than 80%, and solution strengthening is carried out to ferrite using silicon (Si) element, the wherein mass percent shared by each component is：Carbon (C)：2.9 3.5%, silicon (Si)：3.0 4.8%, manganese (Mn)：0.0001 0.3%, phosphorus (P)：0.0001 0.07%, copper (Cu)：0.0001 0.2%, chromium (Cr)：0.0001 0.1%, molybdenum (Mo)：0.0001 0.1%, tin (Sn)：0.0001 0.02%, sulphur (S)：0.007 0.020%, magnesium (Mg)：0.008 0.030%, rare earth (RE)：0.010 0.040%, balance of iron (Fe) and inevitably trace element；Wherein carbon equivalent need to be maintained at 4.2 4.6%, mass percent+(mass percent/3 of silicon) of the carbon equivalent=carbon；The production method of the solution strengthening ferrite vermicular cast iron includes dispensing and fusing, compactedization and inoculation and cooling and unpacks that the present invention effectively improves the mechanical property and machining property of vermicular cast iron, while reducing the production cost of vermicular cast iron.
Description
Technical field
The invention belongs to metal smelt technical field, and in particular to a kind of vermicular cast iron and its production method, more particularly to
A kind of silicon solution strengthening ferrite vermicular cast iron and its production method.
Background technology
Vermicular iron abbreviation vermicular cast iron, its graphite form is in vermiform, and the carbon in it is main with worm
Shape graphite form is separated out.The matrix of vermicular cast iron includes ferrite and pearlite：Ferrite is carbon dissolution in α-Fe
Interstitial solid solution, with sheet, bulk, needle-like and netted presence, pearlite is that the one kind in cast iron is plain by iron to Cast Iron ferritic
The lamellar tissue that body thin layer and cementite thin layer are constituted.The tensile strength of vermicular cast iron is with pearl in the case of graphite form identical
Body of light content increases and increases, therefore to improve the intensity of vermicular cast iron in the prior art is usually by improving content of pearlite in alloy
To realize.As existing national standards《GB/T 26655-2011 pieces of vermicular cast iron》Specified in like that, grades of v.g. iron from
When RuT300, RuT350, RuT400, RuT450, RuT500 are stepped up, its matrix is by pure ferrite, ferrite+pearly-lustre
Body, pearlite+ferrite, pearlite change.It is this to be had the drawback that lifting the method for intensity by improving content of pearlite in alloy：
Improving content of pearlite in alloy will add the alloying element that Cu, Mo, Sn, Ni etc. promote pearlite to be formed, so as to cause production cost to increase
Plus；Simultaneously as content of pearlite in alloy increases, casting hardness also increases, and causes pearl because casting each several part cooling velocity is different
Body of light content is different, so as to the difference of hardness for causing each position of casting also increases therewith, causes machining difficulty, increases machining
Cost also reduces machining accuracy simultaneously.
Application not to silicon solution strengthening technology on vermicular cast iron in the prior art is studied and illustrated.And mesh
The production method of the high silicon molybdenum vermicular cast iron disclosed in preceding prior art causes it added with high level and expensive Mo
Production cost is too high, limits its application in common occasion.
The information for being disclosed in the background section is merely intended to increase the understanding to general background of the invention, without answering
In being considered as recognizing or imply in any form that the information structure has been the prior art well known to persons skilled in the art.
The content of the invention
It is an object of the invention to provide a kind of solution strengthening ferrite vermicular cast iron and its production method, the vermicular cast iron
Mechanical property and machining property be improved, the cost of its production method can also be reduced simultaneously.
To achieve the above object, the invention provides a kind of solution strengthening ferrite vermicular cast iron, its matrix is included
Ferrite of the mass percent more than 80%, and solution strengthening is carried out to ferrite using silicon (Si) element, wherein ferrite contains
Amount is measured by standard GB/T/T1954-2008.
Above-mentioned solution strengthening ferrite vermicular cast iron in another embodiment, the quality percentage wherein shared by each component
Than for：Carbon (C)：2.9-3.5%, silicon (Si)：3.0-4.8%, manganese (Mn)：0.0001-0.3%, phosphorus (P)：0.0001-
0.07%, copper (Cu)：0.0001-0.2%, chromium (Cr)：0.0001-0.1%, molybdenum (Mo)：0.0001-0.1%, tin (Sn)：
0.0001-0.02%, sulphur (S)：0.007-0.020%, magnesium (Mg)：0.008-0.030%, rare earth (RE)：0.010-
0.040%, balance of iron (Fe) and inevitably trace element；Wherein carbon equivalent need to be maintained at 4.2-4.6%, the carbon
The mass percent of equivalent=carbon+(mass percent/3 of silicon).
The ferritic tensile strength of described solution strengthening and hardness obtain same iron under the conditions of being much larger than known technology
The vermicular cast iron of ferritic content, tensile strength is 400-550MPa, and hardness is 180-220HB, yield tensile ratio (yield strength/tension
Intensity) it is 0.85-0.95；Its principle is to carry out solution strengthening to ferrite matrix by silicon (Si) element, is made ferritic anti-
Tensile strength, hardness are more than common ferrite.
Present invention also offers a kind of method for producing solution strengthening ferrite vermicular cast iron, methods described includes following step
Suddenly：
Creepage rate and inoculation, compactedization are carried out with the method that pours or injection feeding technology to base iron using vermiculizer and inovulant
Rate is controlled with 80-95%, is then poured into a mould.
The method of above-mentioned solution strengthening ferrite vermicular cast iron in another embodiment, each component in the base iron
Shared mass percent is：Carbon (C)：2.9-3.7%, silicon (Si)：2.5-4.0%, manganese (Mn)：0.0001-0.3%, phosphorus
(P)：0.0001-0.07%, copper (Cu)：0.0001-0.2%, chromium (Cr)：0.0001-0.1%, molybdenum (Mo)：0.0001-
0.1%, tin (Sn)：0.0001-0.02%, sulphur (S)：0.007-0.020%, magnesium (Mg)：0.0001-0.005, rare earth (RE)：
0.0001-0.008%, inevitably balance of iron (Fe) and trace element；Wherein carbon equivalent need to be maintained at 4.2-
4.6%, mass percent+(mass percent/3 of silicon) of the carbon equivalent=carbon.
Compared with prior art, the present invention has the advantages that：
(1) in terms of material capability：Its matrix is based on silicon solution strengthening ferrite, therefore casting body tensile strength is high
(400-550MPa), hardness is moderate (190-220HB), and casting different parts difference of hardness is small (being less than 15HB), is thus susceptible to
Machining and beneficial to ensureing machining accuracy, while elongation percentage is (be more than 3.0%) high, particularly yield tensile ratio (yield strength with it is anti-
The ratio between tensile strength) (0.88-0.93) high；
(2) in terms of production cost：It is reinforced alloys element with silicon, the raw material ferrosilicon for being used is readily available and price
It is cheap, without the additionally alloy such as addition Mo, Cu, Cr, Mn, Sn, therefore low production cost.
Specific embodiment
Specific embodiment of the invention is described in detail below, it is to be understood that protection scope of the present invention is not
Limited by specific embodiment.
Embodiment one
A kind of silicon solution strengthening ferrite vermicular cast iron is present embodiments provided, the mass percent shared by each component is：
Carbon (C)：3.4%, silicon (Si)：3.6%, manganese (Mn)：0.23%, phosphorus (P)：0.04%, copper (Cu)：0.04%, chromium (Cr)：
0.04%, molybdenum (Mo)：0.03%, tin (Sn)：0.007%, sulphur (S)：0.010%, magnesium (Mg)：0.011%, rare earth (RE)：
0.025%, balance of iron (Fe) and inevitably trace element；The wherein mass percent of carbon equivalent=carbon+(matter of silicon
Amount percentage/3), carbon equivalent=4.6%.
Embodiment two
A kind of silicon solution strengthening ferrite vermicular cast iron is present embodiments provided, the mass percent shared by each component is：
Carbon (C)：2.9%, silicon (Si)：4.8%, manganese (Mn)：0.23%, phosphorus (P)：0.04%, copper (Cu)：0.04%, chromium (Cr)：
0.04%, molybdenum (Mo)：0.03%, tin (Sn)：0.007%, sulphur (S)：0.010%, magnesium (Mg)：0.012%, rare earth (RE)：
0.020%, balance of iron (Fe) and inevitably trace element；The wherein mass percent of carbon equivalent=carbon+(matter of silicon
Amount percentage/3), carbon equivalent=4.5%.
Embodiment three
A kind of silicon solution strengthening ferrite vermicular cast iron is present embodiments provided, the mass percent shared by each component is：
Carbon (C)：3.1%, silicon (Si)：4.2%, manganese (Mn)：0.23%, phosphorus (P)：0.04%, copper (Cu)：0.04%, chromium (Cr)：
0.04%, molybdenum (Mo)：0.03%, tin (Sn)：0.007%, sulphur (S)：0.013%, magnesium (Mg)：0.020%, rare earth (RE)：
0.010%, balance of iron (Fe) and inevitably trace element；The wherein mass percent of carbon equivalent=carbon+(matter of silicon
Amount percentage/3), carbon equivalent=4.5%.
Example IV
The production method of the silicon solution strengthening ferrite vermicular cast iron of above three embodiment is produced, is comprised the following steps：
(1) dispensings and fusing：Foundry iron, component by carbon content more than 3.3% are w (C)>96%, volatile matter≤
1.0%, w (S)≤0.5%, w (moisture)≤0.55%, granularity are that the graphite carburant of 1-5mm and melting are placed with steel scrap
The melting in medium-frequency induction furnace, after base iron temperature reaches 1430-1450 DEG C, is skimmed, sample examination composition, and root
Hot metal composition is adjusted according to components tests result, the matter in the base iron corresponding to above three embodiment shared by each component
Measuring percentage is：
(2) compactedization and inoculation：The creepage rate process is after vermiculizer is placed into creepage rate bag, to wait to close
After desired base iron pours Bao Nei and vermiculizer reaction, creepage rate process terminates, so as to compactedization for being meeted the requirements
Treatment molten iron.Under specific steps enter：The vermiculizer of rare earth magnesium is first added in the compactedization reaction hole of creepage rate bag, addition is
The 0.15-0.20% of weight of molten iron, and covered with the 75SiFe inovulants that granularity is 3-10mm；Then in iron notch
Rare earth silicon vermiculizer is added, addition is the 0.09-0.12% of weight of tapping a blast furnace, and the molten iron is tapped a blast furnace by iron notch, wherein
1500-1525 DEG C of tapping temperature, waits the compactedization reaction of rare earth silicon vermiculizer to be skimmed after terminating after tapping a blast furnace, then ladle-to-ladle to arrive
Poured into a mould in pouring ladle, pouring temperature is 1390-1425 DEG C.
(3) cool down and unpack：Treat that casting naturally cools to less than 400 DEG C in sand mold and unpacks after cast.
Wherein, the mass percent in the rare earth magnesium vermiculizer shared by each component is：RE：4-6%, Mg：7-9%, Si：
40-45%, remaining is Fe, and granularity is 10-25mm, and the granularity of the rare earth silicon vermiculizer is 3-8mm, wherein shared by each component
Mass percent is：：RE：29.5%, Si：45.6%, remaining is Fe, and granularity is 3-8mm.
The comparative example of embodiment five
Be can be seen that by above-mentioned correction data：
1st, the elongation percentage of the compacted iron of solution strengthening ferrite, yield strength, yield tensile ratio are apparently higher than Standard；
2nd, the compacted iron hardness of solution strengthening ferrite is moderate, is easy to machining.
The foregoing description to specific illustrative embodiment of the invention be in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned teaching, can be much changed
And change.The purpose of selecting and describing the exemplary embodiment is that explaining that certain principles of the invention and its reality should
With so that those skilled in the art can realize and using a variety of exemplaries of the invention and
A variety of selections and change.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (4)
1. a kind of solution strengthening ferrite vermicular cast iron, it is characterised in that matrix is comprising mass percent more than 80%
Ferrite, and solution strengthening is carried out to ferrite using silicon (Si) element.
2. solution strengthening ferrite vermicular cast iron according to claim 1, it is characterised in that the quality hundred shared by each component
Point ratio is：Carbon (C)：2.9-3.5%, silicon (Si)：3.0-4.8%, manganese (Mn)：0.0001-0.3%, phosphorus (P)：0.0001-
0.07%, copper (Cu)：0.0001-0.2%, chromium (Cr)：0.0001-0.1%, molybdenum (Mo)：0.0001-0.1%, tin (Sn)：
0.0001-0.02%, sulphur (S)：0.007-0.020%, magnesium (Mg)：0.008-0.030%, rare earth (RE)：0.010-
0.040%, balance of iron (Fe) and inevitably trace element；Wherein carbon equivalent need to be maintained at 4.2-4.6%, the carbon
The mass percent of equivalent=carbon+(mass percent/3 of silicon).
3. a kind of method for producing solution strengthening ferrite vermicular cast iron, it is characterised in that methods described comprises the following steps：
Creepage rate and inoculation, nodulizing rate control are carried out with the method that pours or injection feeding technology to base iron using vermiculizer and inovulant
Then system is poured into a mould with 80-95%.
4. the method for solution strengthening ferrite vermicular cast iron according to claim 3, it is characterised in that in the base iron
Mass percent shared by each component is：Carbon (C)：2.9-3.7%, silicon (Si)：2.5-4.0%, manganese (Mn)：0.0001-
0.3%, phosphorus (P)：0.0001-0.07%, copper (Cu)：0.0001-0.2%, chromium (Cr)：0.0001-0.1%, molybdenum (Mo)：
0.0001-0.1%, tin (Sn)：0.0001-0.02%, sulphur (S)：0.007-0.020%, magnesium (Mg)：0.0001-0.005%,
Rare earth (RE)：0.0001-0.008%, inevitably balance of iron (Fe) and trace element；Wherein carbon equivalent need to be maintained at
4.2-4.6%, mass percent+(mass percent/3 of silicon) of the carbon equivalent=carbon.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110904381A (en) * | 2019-12-30 | 2020-03-24 | 江西久旺汽车配件制造有限公司 | Vermicular graphite cast iron material and preparation method and application thereof |
| CN112030063A (en) * | 2020-08-17 | 2020-12-04 | 锦州捷通铁路机械股份有限公司 | Process for producing high-elongation RuT350 vermicular graphite cast iron for railway rolling stock by covering vermicular graphite |
| US20220090238A1 (en) * | 2020-09-23 | 2022-03-24 | Tupy S.A. | Vermicular Cast Iron Alloy, Combustion Engine Block and Head |
| CN115074613A (en) * | 2022-05-17 | 2022-09-20 | 烟台大学 | High-thermal-conductivity high-thermal-fatigue-resistance vermicular graphite cast iron and preparation method thereof |
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| CN115074613A (en) * | 2022-05-17 | 2022-09-20 | 烟台大学 | High-thermal-conductivity high-thermal-fatigue-resistance vermicular graphite cast iron and preparation method thereof |
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