CN108441753A - A kind of spheroidal graphite cast-iron and its preparation process - Google Patents
A kind of spheroidal graphite cast-iron and its preparation process Download PDFInfo
- Publication number
- CN108441753A CN108441753A CN201810579975.2A CN201810579975A CN108441753A CN 108441753 A CN108441753 A CN 108441753A CN 201810579975 A CN201810579975 A CN 201810579975A CN 108441753 A CN108441753 A CN 108441753A
- Authority
- CN
- China
- Prior art keywords
- iron
- spheroidal graphite
- graphite cast
- inoculation
- preparation process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
-
- 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
- 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
Abstract
The invention belongs to spheroidal graphite cast-iron fields, and it discloses a kind of spheroidal graphite cast-iron, are made of following weight percent composition：C：3.40‑3.50；Si：3.80‑3.90；Mn：0.26‑0.35；P:0.015‑0.025；S:0.006‑0.012；La:0.0040‑0.0055；Mg:0.035‑0.045；Surplus Fe and impurity can not be removed.The purpose of the present invention is to provide a kind of spheroidal graphite cast-iron and its preparation process, 571 596MPa of tensile strength of the spheroidal graphite cast-iron, elongations 20 23%.Especially, it should be noted that the present invention overcomes the prejudice of traditional technology, the present invention can improve Oxygen potential also without using Sb can reach the unification of tensile strength and elongation, and the raising of intensity can be also reached without using Mo and Ni.
Description
Technical field
The present invention relates to spheroidal graphite cast-iron field, specially a kind of spheroidal graphite cast-iron and its preparation process.
Background technology
The Chinese patent of CN101603142 discloses a kind of high-intensity and high-tenacity ductile cast iron casting and preparation method thereof,
The patent each component and its weight percent are：C3.6~3.8%, Si2.4~2.8%, Mn0.8~0.9%, Cu0.5~
0.6%, Cr0.1~0.2%, S≤0.02%, P≤0.07%, surplus Fe.The mechanical property of its casting be tensile strength >=
590MPa, yield strength >=380MPa, elongation percentage >=8%；The manganese of the casting, copper content are higher, cause using elongation percentage as the main force
It is relatively low to learn performance indicator.
The Chinese patent of Patent No. CN102747268B discloses a kind of high intensity, high-ductility spheroidal graphite cast-iron and its manufacture
Method, the patent each component and its weight percent are：C3.4~3.8%, Si2.3~2.7%, Mn0.3~0.5%, Cu0.3
~0.5%, Cr0.02~0.10%, S≤0.03%, P≤0.04%, Sb0.001~0.005%, Mg0.03~0.06%,
Re0.001~0.003%, surplus Fe.The elongation percentage of casting is relatively low.
It is believed that Mn is more, elongation percentage is lower, meanwhile, the spheroidal graphite cast-iron near aforementioned proportion range, intensity one
As for, will not be especially high.
For this problem, CN201610357227.0 discloses a kind of high performance spheroidal graphite cast-iron reel and its preparation side
Method is process by ductile cast iron material, and spheroidal graphite cast-iron used includes following components in percentage by weight：3.0%~3.3%
C；3.6%~4.0% Si；S<0.02%；P<0.03%；Mn<0.3%；0.02%~0.04% Mg；0.01%~
0.025% RE；0.2%~0.3% Mo；0.12%~0.15% Ni；0.003%~0.010% Ca, 0.005%
~0.010% Ba, and 0.010%≤Ca+Ba≤0.020%, Bi≤0.003%；Surplus be Fe and inevitably it is miscellaneous
Matter, the tensile strength sigma of spheroidal graphite cast-iron usedb>=540MPa, yield strength σ0.2>=400MPa, elongation percentage δ >=14%.It is being said
It is illustrated in composition proportion inside bright book；By increasing Si contents, weight percent has reached 3.6%~4.0%, promotes stone
Mo Hua, fining ferrite, while Si play solid solution strengthening effect in iron-based body, realize higher intensity；Pass through increase
Mo has refined ferrite, enhances matrix, and improvement improves the comprehensive performances such as intensity, hardness, toughness；Strengthen iron by increasing Ni
Ferritic refines graphite, increases the number of graphite, improves nodularization effect, strengthens matrix, eliminates the increase institute band by Si contents
The silicon brittleness come influences, and improves the toughness of matrix.This formulated component makes quantity, size, the form of graphite nodule in spheroidal graphite cast-iron
And distribution, obtain the as-cast structure of 95% or more ferrite matrix and tiny, uniform, Dispersed precipitate a large amount of globular graphites.
That is the hardness and strength of spheroidal graphite cast-iron, such as Mo and Ni can be improved by introducing other elements.
CN201510420912.9 discloses a kind of big cross section casting ferrite with nodular cast iron and preparation method thereof, the spheroidal graphite
The element of cast iron materials forms：C:3.1~3.5wt%, Si:3.0~4.0wt%, Mn≤0.3wt%, P≤0.04wt%, S:
0.01~0.03wt%, Sb:0.001~0.006wt%, Mg:0.03~0.05wt%, Re:0.01-0.03wt% remaining be Fe
With the impurity brought into preparation process.Its performance indicator is：Single casting：Tensile strength >=580MPa, yield strength >=450MPa, prolongs
Stretch rate >=15%；Attached casting：Tensile strength >=530MPa, yield strength >=400MPa, elongation percentage >=12.5%.It is in embodiment 1-
Being indicated in 4 and comparative example 1-4 as follows must parameter：1, coverture should select the low silicon high ferro coverture of ferrosilicon containing Ba, no
FeSi75 can be selected；2, Sb must be added in preparation process；It is unsatisfactory for if above-mentioned 2 points any, elongation percentage can obviously drop
It is low, or even less than 2%；Especially coverture is selected when FeSi75 and in the case of being not added with Sb, and elongation percentage, which can be reduced to, to be held
The degree born (less than 2%).
CN201610556790.0 discloses a kind of admittedly molten reinforced ferrite spheroidal graphite cast-iron of silicon, it is characterised in that：Each component
Be by weight percentage C content be 3.05~3.30%, Si contents be 3.80~4.00%, Mn contents be 0.15~
0.25%, Mg content be 0.035~0.050%, P content≤0.035%, S content≤0.015%, Ce content be 0.0030~
0.0040%, Sb content are 0.0045~0.0055%, remaining is iron.Its independent emphasis in processing step, which describes, to be bred
The Sb elements of iron liquid quality 0.0030~0.0045% are added in the process.
The effect of Mo and Ni are drummed in CN201610357227.0, otherwise hardness and strength can be obviously damaged.
In CN201510420912.9 and CN201610556790.0, the effect of Sb is drummed in, if Sb does not exist
It is added in preparation process, then elongation percentage can be by serious influence.
Invention content
The purpose of the present invention is to provide a kind of spheroidal graphite cast-iron and its preparation process, the tensile strength 571- of the spheroidal graphite cast-iron
596MPa, elongation 20-23%.Especially, it should be noted that the present invention overcomes the prejudice of traditional technology, the present invention does not use
Sb, which can improve Oxygen potential also, can reach the unification of tensile strength and elongation, can also reach carrying for intensity without using Mo and Ni
Height, i.e., by the optimization of formula and processing, without under the cooperation of other special alloys, reaching the system of intensity, hardness, elongation
One.
To achieve the above object, the present invention provides the following technical solutions：A kind of spheroidal graphite cast-iron, including following weight percent
Component：C：3.40-3.50；Si：3.80-3.90；Mn：0.26-0.35；P:0.015-0.025；S:0.006-0.012；La:
0.0040-0.0055；Mg:0.035-0.045；Surplus Fe and impurity can not be removed.
In above-mentioned spheroidal graphite cast-iron, including following weight percent composition：C：3.42-3.48；Si：3.82-3.88；
Mn：0.26-0.35；P:0.015-0.025；S:0.006-0.012；La:0.0040-0.0055；Mg:0.035-0.045；Surplus
Fe and impurity can not be removed.
Meanwhile the invention also discloses a kind of preparation process of spheroidal graphite cast-iron as described above, including the following steps：
Step 1：Raw material heating is fused into iron liquid, and is following weight percent by the composition regulation of iron liquid：C：3.45-
3.55%；Si：2.55-2.65%；Mn：0.26-0.35；P：0.015-0.025；It S≤0.015 and surplus Fe and can not remove
Impurity；
Step 2：The temperature of the iron liquid of step 1 is adjusted to 1470-1480 DEG C, goes out iron liquid and carries out spheroidising；
Step 3：Carry out the inoculation of corresponding amount respectively in the spheroidizing process of step 2 and in casting process.
In the preparation process of above-mentioned spheroidal graphite cast-iron, 1520-1540 DEG C of the temperature of iron liquid in the step 1.
In the preparation process of above-mentioned spheroidal graphite cast-iron, the raw material in the step 1 for high duty pig iron and is packaged steel scrap,
High duty pig iron is 40-50 with the weight ratio for being packaged steel scrap:50-60；
The weight percent composition of the high duty pig iron is：C≥4.40；Si：0.40-0.60；Mn≤0.10；≤P≤
0.025；S：≤0.020；Ti≤0.025；Cr≤0.015；V≤0.010；It Pb≤0.003 and surplus Fe and can not clean
Matter；
The weight percent composition of the packing steel scrap is：C：0.05-0.20；Si：0.10-0.50；Mn≤0.40；P
≤0.030；S≤0.010；T≤0.015；V≤0.0010 and surplus Fe and impurity can not be removed.
In the preparation process of above-mentioned spheroidal graphite cast-iron, the nodulizer in the step 2 in spheroidizing process is phase
When the full group of the lanthanides nodulizer of the 1-1.1% in raw material gross weight；The weight percent composition of the full group of the lanthanides nodulizer is：
Mg：5.95；Si：46.28；La：0.55；Ca：3.18；Al：0.48, remaining Fe；The granularity of the full group of the lanthanides nodulizer：3-
25mm。
In the preparation process of above-mentioned spheroidal graphite cast-iron, the step 3 is specially：
First time inoculation：75SiFe inovulants are pressed in above nodulizer, an inoculation is carried out；75SiFe is pregnant
The weight percent composition for educating agent is：Si：74.51；Al：1.08；Remaining Fe；
Second and third secondary inoculation：When going out iron liquid half and 3/4ths when, is separately added into high calcium barium inovulant,
Carry out two, three times inoculation；High calcium barium inovulant weight percent composition is：Si：72.99；Ca：1.25；Ba：2.97；Al：
1.25；Remaining Fe；
4th inoculation：Sulphur oxygen inovulant is added when cast and carries out current-following inoculation processing.Sulphur oxygen inovulant weight hundred
Divide and is divided into Si than group：73.1；Ca：0.82；Ce：1.78；Al：0.88；S, O is appropriate；Remaining Fe；Granularity：0.2-0.7mm；
In the preparation process of above-mentioned spheroidal graphite cast-iron, the 75SiFe inovulants are equivalent to the 0.4% of raw material gross weight.
In the preparation process of above-mentioned spheroidal graphite cast-iron, the high calcium barium inovulant is equivalent to the 0.7% of raw material gross weight,
Wherein half when amount of amount when being 0.3%, 3/4ths be 0.4%.
In the preparation process of above-mentioned spheroidal graphite cast-iron, the sulphur oxygen inovulant is equivalent to the 0.2% of raw material gross weight.
It is all convenient source to be used for adjusting the ferromanganese of Mn and Si and ferrosilicon needed in above-mentioned steps 1.
Compared with prior art, the beneficial effects of the invention are as follows：
Spheroidal graphite cast-iron proposed by the invention is QT550-18, and with high tensile strength, i.e. Rm is 571-
596MPa, and very high elongation A is 20-23%, and Mechanical processing of casting excellent cutting performance, hardness are：175-195HB.
Description of the drawings
Fig. 1 is the graphite form 100 times (before corrosion) of the embodiment of the present invention 1；
Fig. 2 is the matrix 100 times (after corrosion) of the embodiment of the present invention 1.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
A kind of spheroidal graphite cast-iron, including following weight percent composition：C：3.40；Si：3.90；Mn：0.35；P:0.015；S:
0.008；La:0.0045；Mg:0.035；Surplus Fe and impurity can not be removed.
A kind of preparation process of spheroidal graphite cast-iron as described above, includes the following steps：
Step 1：Raw material heating is fused into iron liquid, 1540 DEG C of the temperature of iron liquid；And by the composition regulation of iron liquid it is as follows
Weight percent：C：3.45%；Si：2.65%；Mn：0.35；P：0.015；S：It 0.014 and surplus Fe and can not clean
Matter；Raw material is high duty pig iron and is packaged steel scrap, and high duty pig iron is 40 with the weight ratio for being packaged steel scrap:60；The high duty pig iron
Weight percent composition be：C≥4.40；Si：0.40-0.60；Mn≤0.10；≤P≤0.025；S：≤0.020；Ti≤
0.025；Cr≤0.015；V≤0.010；Pb≤0.003 and surplus Fe and impurity can not be removed；The weight of the packing steel scrap
Measuring percent composition is：C：0.05-0.20；Si：0.10-0.50；Mn≤0.40；P≤0.030；S≤0.010；T≤0.015；V
≤ 0.0010 and surplus Fe and impurity can not be removed.
Step 2：The temperature of the iron liquid of step 1 is adjusted to 1480 DEG C, goes out iron liquid and carries out spheroidising；Spheroidizing process
In nodulizer be the 1.1% full group of the lanthanides nodulizer for being equivalent to raw material gross weight；The weight hundred of the full group of the lanthanides nodulizer
Divide and is divided into than group：Mg：5.95；Si：46.28；La：0.55；Ca：3.18；Al：0.48, remaining Fe；The full group of the lanthanides nodulizer
Granularity：3-25mm.
Step 3：Carry out the inoculation of corresponding amount respectively in the spheroidizing process of step 2 and in casting process；
The step 3 is specially：
First time inoculation：75SiFe inovulants are pressed in above nodulizer, an inoculation is carried out；75SiFe is pregnant
The weight percent composition for educating agent is：Si：74.51；Al：1.08；Remaining Fe；The 75SiFe inovulants are equivalent to raw material gross weight
0.4%.
Second and third secondary inoculation：When going out iron liquid half and 3/4ths when, is separately added into high calcium barium inovulant,
Carry out two, three times inoculation；High calcium barium inovulant weight percent composition is：Si：72.99；Ca：1.25；Ba：2.97；Al：
1.25；Remaining Fe；The high calcium barium inovulant is equivalent to the 0.7% of raw material gross weight, wherein half when amount be 0.3%,
Amount when 3/4ths is 0.4%.
4th inoculation：Sulphur oxygen inovulant is added when cast and carries out current-following inoculation processing.Sulphur oxygen inovulant weight hundred
Divide and is divided into Si than group：73.1；Ca：0.82；Ce：1.78；Al：0.88；S, O is appropriate；Remaining Fe；Granularity：0.2-0.7mm；Described
Sulphur oxygen inovulant is equivalent to the 0.2% of raw material gross weight.
The inspection result of the thick attached casting test blocks of 70mm：Tensile strength Rm is 589MPa, and elongation A is 22.5%, and casting adds
Work excellent cutting performance, hardness are：188HB.Metallographic structure：(1) Fig. 1, graphite form (first 100 times of corrosion) Oxygen potential 95%, stone
Black size：7 grades, graphite：175/mm2；(2) Fig. 2, matrix (after corrosion 100 times) pearlite fraction 98%, iron element
Body quantity 2%.
Embodiment 2
A kind of spheroidal graphite cast-iron, including following weight percent composition：C：3.50；Si：3.80；Mn：0.26；P:0.025；S:
0.012；La:0.0050；Mg:0.045；Surplus Fe and impurity can not be removed.
A kind of preparation process of spheroidal graphite cast-iron as described above, includes the following steps：
Step 1：Raw material heating is fused into iron liquid, the temperature of iron liquid is 1520 DEG C；And by the composition regulation of iron liquid for such as
Lower weight percent：C：3.55%；Si：2.55%；Mn：0.26；P：0.025；S：It 0.015 and surplus Fe and can not clean
Matter；The raw material is high duty pig iron and is packaged steel scrap, and high duty pig iron is 50 with the weight ratio for being packaged steel scrap:50；Described is excellent
The weight percent composition of the matter pig iron is：C≥4.40；Si：0.40-0.60；Mn≤0.10；≤P≤0.025；S：≤0.020；
Ti≤0.025；Cr≤0.015；V≤0.010；Pb≤0.003 and surplus Fe and impurity can not be removed；
The weight percent composition of the packing steel scrap is：C：0.05-0.20；Si：0.10-0.50；Mn≤0.40；P
≤0.030；S≤0.010；T≤0.015；V≤0.0010 and surplus Fe and impurity can not be removed.
Step 2：The temperature of the iron liquid of step 1 is adjusted to 1470 DEG C, goes out iron liquid and carries out spheroidising；Spheroidizing process
In nodulizer be the 1.1% full group of the lanthanides nodulizer for being equivalent to raw material gross weight；The weight hundred of the full group of the lanthanides nodulizer
Divide and is divided into than group：Mg：5.95；Si：46.28；La：0.55；Ca：3.18；Al：0.48, remaining Fe；The full group of the lanthanides nodulizer
Granularity：3-25mm.
Step 3：Carry out the inoculation of corresponding amount respectively in the spheroidizing process of step 2 and in casting process；
The step 3 is specially：
First time inoculation：75SiFe inovulants are pressed in above nodulizer, an inoculation is carried out；75SiFe is pregnant
The weight percent composition for educating agent is：Si：74.51；Al：1.08；Remaining Fe；The 75SiFe inovulants are equivalent to raw material gross weight
0.4%.
Second and third secondary inoculation：When going out iron liquid half and 3/4ths when, is separately added into high calcium barium inovulant,
Carry out two, three times inoculation；High calcium barium inovulant weight percent composition is：Si：72.99；Ca：1.25；Ba：2.97；Al：
1.25；Remaining Fe；The high calcium barium inovulant is equivalent to the 0.7% of raw material gross weight, wherein half when amount be 0.3%,
Amount when 3/4ths is 0.4%.
4th inoculation：Sulphur oxygen inovulant is added when cast and carries out current-following inoculation processing.Sulphur oxygen inovulant weight hundred
Divide and is divided into Si than group：73.1；Ca：0.82；Ce：1.78；Al：0.88；S, O is appropriate；Remaining Fe；Granularity：0.2-0.7mm；Described
Sulphur oxygen inovulant is equivalent to the 0.2% of raw material gross weight.
The inspection result of the thick attached casting test blocks of 70mm：Tensile strength Rm is 571MPa, and elongation A is 23%, and Mechanical processing of casting
Excellent cutting performance, hardness are：175HB.Metallographic structure testing result is similar to embodiment 1.
Embodiment 3
A kind of spheroidal graphite cast-iron, including following weight percent composition：C：3.45；Si：3.85；Mn：0.30；P:0.020；S:
0.009；La:0.0040；Mg:0.040；Surplus Fe and impurity can not be removed.
A kind of preparation process of spheroidal graphite cast-iron as described above, includes the following steps：
Step 1：Raw material heating is fused into iron liquid, the temperature of iron liquid is 1530 DEG C；And by the composition regulation of iron liquid for such as
Lower weight percent：C：3.50%；Si：2.60%；Mn：0.30；P：0.020；S：It 0.012 and surplus Fe and can not clean
Matter；Raw material is high duty pig iron and is packaged steel scrap, and high duty pig iron is 45 with the weight ratio for being packaged steel scrap:55；The high duty pig iron
Weight percent composition be：C≥4.40；Si：0.40-0.60；Mn≤0.10；≤P≤0.025；S：≤0.020；Ti≤
0.025；Cr≤0.015；V≤0.010；Pb≤0.003 and surplus Fe and impurity can not be removed；The weight of the packing steel scrap
Measuring percent composition is：C：0.05-0.20；Si：0.10-0.50；Mn≤0.40；P≤0.030；S≤0.010；T≤0.015；V
≤ 0.0010 and surplus Fe and impurity can not be removed.
Step 2：The temperature of the iron liquid of step 1 is adjusted to 1475 DEG C, goes out iron liquid and carries out spheroidising；Spheroidizing process
In nodulizer be the 1.05% full group of the lanthanides nodulizer for being equivalent to raw material gross weight；The weight hundred of the full group of the lanthanides nodulizer
Divide and is divided into than group：Mg：5.95；Si：46.28；La：0.55；Ca：3.18；Al：0.48, remaining Fe；The full group of the lanthanides nodulizer
Granularity：3-25mm.
Step 3：Carry out the inoculation of corresponding amount respectively in the spheroidizing process of step 2 and in casting process；
Step 3 is specially：
First time inoculation：75SiFe inovulants are pressed in above nodulizer, an inoculation is carried out；75SiFe is pregnant
The weight percent composition for educating agent is：Si：74.51；Al：1.08；Remaining Fe；The 75SiFe inovulants are equivalent to raw material gross weight
0.4%.
Second and third secondary inoculation：When going out iron liquid half and 3/4ths when, is separately added into high calcium barium inovulant,
Carry out two, three times inoculation；High calcium barium inovulant weight percent composition is：Si：72.99；Ca：1.25；Ba：2.97；Al：
1.25；Remaining Fe；The high calcium barium inovulant is equivalent to the 0.7% of raw material gross weight, wherein half when amount be 0.3%,
Amount when 3/4ths is 0.4%.
4th inoculation：Sulphur oxygen inovulant is added when cast and carries out current-following inoculation processing.Sulphur oxygen inovulant weight hundred
Divide and is divided into Si than group：73.1；Ca：0.82；Ce：1.78；Al：0.88；S, O is appropriate；Remaining Fe；Granularity：0.2-0.7mm；Described
Sulphur oxygen inovulant is equivalent to the 0.2% of raw material gross weight.
The inspection result of the thick attached casting test blocks of 70mm：Tensile strength Rm is 596MPa, and elongation A is 20%, and Mechanical processing of casting
Excellent cutting performance, hardness are：195HB.Metallographic structure testing result is similar to embodiment 1.
Embodiment 4
A kind of spheroidal graphite cast-iron, including following weight percent composition：C：3.48；Si：3.88；Mn：0.32；P:0.018；S:
0.008；La:0.0046；Mg:0.038；Surplus Fe and impurity can not be removed.
A kind of preparation process of spheroidal graphite cast-iron as described above, includes the following steps：
Step 1：Raw material heating is fused into iron liquid, the temperature of iron liquid is 1532 DEG C；And by the composition regulation of iron liquid for such as
Lower weight percent：C：3.52%；Si：2.62%；Mn：0.32；P：0.018；S：It 0.010 and surplus Fe and can not clean
Matter；
Raw material is high duty pig iron and is packaged steel scrap, and high duty pig iron is 48 with the weight ratio for being packaged steel scrap:52；Described is high-quality
The weight percent composition of the pig iron is：C≥4.40；Si：0.40-0.60；Mn≤0.10；≤P≤0.025；S：≤0.020；Ti
≤0.025；Cr≤0.015；V≤0.010；Pb≤0.003 and surplus Fe and impurity can not be removed；The packing steel scrap
Weight percent composition is：C：0.05-0.20；Si：0.10-0.50；Mn≤0.40；P≤0.030；S≤0.010；T≤
0.015；V≤0.0010 and surplus Fe and impurity can not be removed.
Step 2：The temperature of the iron liquid of step 1 is adjusted to 1477 DEG C, goes out iron liquid and carries out spheroidising；Spheroidizing process
In nodulizer be the 1.1% full group of the lanthanides nodulizer for being equivalent to raw material gross weight；The weight hundred of the full group of the lanthanides nodulizer
Divide and is divided into than group：Mg：5.95；Si：46.28；La：0.55；Ca：3.18；Al：0.48, remaining Fe；The full group of the lanthanides nodulizer
Granularity：3-25mm.
Step 3：Carry out the inoculation of corresponding amount respectively in the spheroidizing process of step 2 and in casting process；
The step 3 is specially：
First time inoculation：75SiFe inovulants are pressed in above nodulizer, an inoculation is carried out；75SiFe is pregnant
The weight percent composition for educating agent is：Si：74.51；Al：1.08；Remaining Fe；The 75SiFe inovulants are equivalent to raw material gross weight
0.4%.
Second and third secondary inoculation：When going out iron liquid half and 3/4ths when, is separately added into high calcium barium inovulant,
Carry out two, three times inoculation；High calcium barium inovulant weight percent composition is：Si：72.99；Ca：1.25；Ba：2.97；Al：
1.25；Remaining Fe；The high calcium barium inovulant is equivalent to the 0.7% of raw material gross weight, wherein half when amount be 0.3%,
Amount when 3/4ths is 0.4%.
4th inoculation：Sulphur oxygen inovulant is added when cast and carries out current-following inoculation processing.Sulphur oxygen inovulant weight hundred
Divide and is divided into Si than group：73.1；Ca：0.82；Ce：1.78；Al：0.88；S, O is appropriate；Remaining Fe；Granularity：0.2-0.7mm；Described
Sulphur oxygen inovulant is equivalent to the 0.2% of raw material gross weight.
The inspection result of the thick attached casting test blocks of 70mm：Tensile strength Rm is 585MPa, and elongation A is 23%, and Mechanical processing of casting
Excellent cutting performance, hardness are：191HB.Metallographic structure testing result is similar to embodiment 1.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (10)
1. a kind of spheroidal graphite cast-iron, which is characterized in that be made of following weight percent composition：C：3.40-3.50；Si：3.80-
3.90；Mn：0.26-0.35；P:0.015-0.025；S:0.006-0.012；La:0.0040-0.0055；Mg:0.035-
0.045；Surplus Fe and impurity can not be removed.
2. spheroidal graphite cast-iron according to claim 1, which is characterized in that be made of following weight percent composition：C：3.42-
3.48；Si：3.82-3.88；Mn：0.26-0.35；P:0.015-0.025；S:0.006-0.012；La:0.0040-0.0055；
Mg:0.035-0.045；Surplus Fe and impurity can not be removed.
3. a kind of preparation process of spheroidal graphite cast-iron as claimed in claim 1 or 2, which is characterized in that
Step 1：Raw material heating is fused into iron liquid, and is following weight percent by the composition regulation of iron liquid：C：3.45-
3.55%；Si：2.55-2.65%；Mn：0.26-0.35；P：0.015-0.025；It S≤0.015 and surplus Fe and can not remove
Impurity；
Step 2：The temperature of the iron liquid of step 1 is adjusted to 1470-1480 DEG C, goes out iron liquid and carries out spheroidising；
Step 3：Carry out the inoculation of corresponding amount respectively in the spheroidizing process of step 2 and in casting process.
4. the preparation process of spheroidal graphite cast-iron according to claim 3, which is characterized in that the temperature of iron liquid in the step 1
1520-1540 DEG C of degree.
5. the preparation process of spheroidal graphite cast-iron according to claim 3, which is characterized in that the raw material in the step 1 is
High duty pig iron and packing steel scrap, high duty pig iron are 40-50 with the weight ratio for being packaged steel scrap:50-60；
The weight percent composition of the high duty pig iron is：C≥4.40；Si：0.40-0.60；Mn≤0.10；P≤0.025；S
≤0.020；Ti≤0.025；Cr≤0.015；V≤0.010；Pb≤0.003 and surplus Fe and impurity can not be removed；
The weight percent composition of the packing steel scrap is：C：0.05-0.20；Si：0.10-0.50；Mn≤0.40；P≤
0.030；S≤0.010；T≤0.015；V≤0.0010 and surplus Fe and impurity can not be removed.
6. the preparation process of spheroidal graphite cast-iron according to claim 3, which is characterized in that spheroidising in the step 2
Nodulizer in the process is the full group of the lanthanides nodulizer for the 1-1.1% for being equivalent to raw material gross weight；The full group of the lanthanides nodulizer
Weight percent composition is：Mg：5.95；Si：46.28；La：0.55；Ca：3.18；Al：0.48, remaining Fe；The full group of the lanthanides ball
The granularity of agent：3-25mm.
7. the preparation process of spheroidal graphite cast-iron according to claim 6, which is characterized in that the step 3 is specially：
First time inoculation：75SiFe inovulants are pressed in above nodulizer, an inoculation is carried out；
Second and third secondary inoculation：When going out iron liquid half and 3/4ths when, is separately added into high calcium barium inovulant, carries out
Two, inoculation three times；
4th inoculation：Sulphur oxygen inovulant is added when cast and carries out current-following inoculation processing.
8. the preparation process of spheroidal graphite cast-iron according to claim 7, which is characterized in that the 75SiFe inovulants are suitable
In the 0.4% of raw material gross weight.
9. the preparation process of spheroidal graphite cast-iron according to claim 7, which is characterized in that the high calcium barium inovulant is suitable
In the 0.7% of raw material gross weight, wherein half when amount of amount when being 0.3%, 3/4ths be 0.4%.
10. the preparation process of spheroidal graphite cast-iron according to claim 7, which is characterized in that the sulphur oxygen inovulant is suitable
In the 0.2% of raw material gross weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810579975.2A CN108441753A (en) | 2018-06-07 | 2018-06-07 | A kind of spheroidal graphite cast-iron and its preparation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810579975.2A CN108441753A (en) | 2018-06-07 | 2018-06-07 | A kind of spheroidal graphite cast-iron and its preparation process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108441753A true CN108441753A (en) | 2018-08-24 |
Family
ID=63206705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810579975.2A Pending CN108441753A (en) | 2018-06-07 | 2018-06-07 | A kind of spheroidal graphite cast-iron and its preparation process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108441753A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182635A (en) * | 2018-09-19 | 2019-01-11 | 中车大连机车车辆有限公司 | The inoculation treating method of spheroidal graphite cast-iron |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005090685A (en) * | 2003-09-19 | 2005-04-07 | Kubota Tekkosho:Kk | Electromagnetic coupling |
| CN102102136A (en) * | 2011-03-07 | 2011-06-22 | 衡阳中钢衡重铸锻有限公司 | As-cast high-toughness ferrite nodular iron and production method thereof |
| CN102367537A (en) * | 2011-07-11 | 2012-03-07 | 山东汇金股份有限公司 | High strength and toughness as-cast nodular cast iron and its production method |
-
2018
- 2018-06-07 CN CN201810579975.2A patent/CN108441753A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005090685A (en) * | 2003-09-19 | 2005-04-07 | Kubota Tekkosho:Kk | Electromagnetic coupling |
| CN102102136A (en) * | 2011-03-07 | 2011-06-22 | 衡阳中钢衡重铸锻有限公司 | As-cast high-toughness ferrite nodular iron and production method thereof |
| CN102367537A (en) * | 2011-07-11 | 2012-03-07 | 山东汇金股份有限公司 | High strength and toughness as-cast nodular cast iron and its production method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182635A (en) * | 2018-09-19 | 2019-01-11 | 中车大连机车车辆有限公司 | The inoculation treating method of spheroidal graphite cast-iron |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106011610B (en) | A kind of high-strength ductile cast iron QT900 6 and preparation method thereof | |
| CN104988381B (en) | Large-section cast ferrite nodular cast iron and preparation method thereof | |
| CN104357735B (en) | high-chromium cast iron and preparation method thereof | |
| CN102747268B (en) | High-strength high-ductility nodular cast iron and manufacturing method thereof | |
| CN103484749B (en) | A kind of nodular cast iron inoculant and preparation method thereof and the application in nodular cast iron smelting | |
| CN108251739A (en) | A kind of high strength high extensibility spheroidal graphite cast-iron and preparation method thereof | |
| CN105886692A (en) | Production technology of - 70 DEG C ultra-low temperature and high tenacity ductile cast iron | |
| CN107400750A (en) | High trade mark magnesium iron inovulant and preparation method thereof | |
| CN108396219A (en) | A kind of bent axle As-Cast High-Strength Ductile Iron and preparation method thereof | |
| CN107699791A (en) | High cold-bending property low-alloy high-strength steel plate of 900MPa levels and preparation method thereof | |
| CN105369119B (en) | A kind of ironcasting material and its production technology | |
| CN108300930A (en) | Wind turbines superhigh intensity low-temperature spheroidal iron casting and its manufacturing method | |
| CN106929747B (en) | A kind of solution strengthening ferrite vermicular cast iron and its production method | |
| CN107974639A (en) | A kind of complex alloy wear-resistant steel ball of high tenacity and preparation method thereof | |
| CN106947911A (en) | A kind of high-intensity high-tenacity high-wearing feature austempored ductile iron and its preparation method and application | |
| CN110592497B (en) | High-strength cast steel and preparation method thereof | |
| CN108048737A (en) | Main load-bearing part steel of drilling lifting means and preparation method thereof | |
| CN109930058A (en) | - 40 DEG C of low-temperature high-strength high-ductility spheroidal graphite cast-iron and preparation method thereof and railway locomotive components | |
| CN108977612B (en) | Smelting method of high-strength atmospheric corrosion resistant bolt steel | |
| CN103233094B (en) | Smelting process of high-strength alloy steel | |
| CN102873465A (en) | 700MPa low-alloy high-strength welding wire for heavy machinery and use method thereof | |
| CN108441753A (en) | A kind of spheroidal graphite cast-iron and its preparation process | |
| CN109097665B (en) | Smelting method of high-strength atmospheric corrosion resistant bolt steel | |
| CN107287498A (en) | Ferrite nodular cast iron and its gravity foundry technology | |
| CN103114250B (en) | Level-B steel with low-temperature impact resistance at -70 DEG C and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180824 |
|
| RJ01 | Rejection of invention patent application after publication |