CN107177773A - A kind of high-strength thin-walled gray iron casting - Google Patents
A kind of high-strength thin-walled gray iron casting Download PDFInfo
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- CN107177773A CN107177773A CN201710485857.0A CN201710485857A CN107177773A CN 107177773 A CN107177773 A CN 107177773A CN 201710485857 A CN201710485857 A CN 201710485857A CN 107177773 A CN107177773 A CN 107177773A
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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
- 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
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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
- C22C37/08—Cast-iron alloys containing chromium with nickel
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- 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 high-strength thin-walled gray iron casting, its chemical composition for being applied to contain in automobile brake drum, the gray iron casting is by mass percentage：C 3.3~3.6%, Si1.6~1.9%, Mn 0.6~0.9%, P≤0.1%, S≤0.04%, Cr 0.2~0.4%, Cu0.25~0.5%, Ti 0.05%~0.15%, Ni≤0.1%, Sn 0.04%~0.08%, Pb≤0.0015%, As≤0.0013%, Al≤0.04%, surplus is Fe.The present invention can solve the problem that prior art Thin-wall Gray Iron easily supercooling D types graphite occurs in casting process and makes the problem of casting strength, hardness and wearability do not reach desirable.
Description
Technical field
The present invention relates to a kind of automobile brake drum field of material technology, cast more particularly, to the high-strength thin-walled ash of one kind
Ironware.
Background technology
Gray cast iron refers to the cast iron with flake graphite, and main component is iron, carbon, silicon, manganese, sulphur, phosphorus, is most widely used
Cast iron, its yield accounts for cast iron total output more than 80%.The mechanical property of gray cast iron is decided by its matrix and flake graphite
Distribution situation.Graphite flake in gray cast iron, plays the role of cutting metallic matrix, destroys its continuity, makes its intensity decreases, especially
It is that undercooled graphite is very harmful to casting, is the fracture origin of casting fracture in use, therefore consider from intensity, production should be avoided
Gave birth to cold mould graphite.Undercooled graphite is D type graphite, it be graphite nucleating condition it is poor (such as carbon amounts is relatively low), cooling velocity
It is larger, cause what is formed in the case of larger supercooling, this graphite is formed between the austenite dendrites during eutectic crystallization
Direction-free point-like, fine platy graphite, often appear in the thin grey ironware of wall, the distribution shape of graphite flake in the grey ironware of control
Condition, is the key for ensureing gray cast iron properties.A type graphite be cast iron graphite life nuclear capability it is relatively low compared with strong, cooldown rate, in mistake
Formed when occurring eutectic transformation under conditions of cold degree very little.When observing under an optical microscope, it is curved that graphite is evenly distributed
Knee-piece shape, non-directional, its length is then different because of the life core condition and cooldown rate of cast iron.The structural casting of high-quality, all
Wish that it has the A type graphite of moderate-length.
The graphite castings that wall thickness is less than 15mm are generally referred to as Thinwall Graphite casting by those skilled in the art.Thin-section casting
Apply and had great significance in terms of mitigating machinery weight, the dexterity of increase machinery, saving raw metal.But simultaneously because
Thickness is smaller, and this casting easily spoken parts in traditional operas and " B " and " D " type graphite occurs in casting, is remarkably decreased the performance of casting, therefore
Intensity, hardness and the wearability of casting are often difficult to reach desirable.
And the brake hubs of existing casting technique production are always difficult to while meeting above-mentioned requirements at present.
The content of the invention
For problems of the prior art, it is an object of the invention to provide a kind of high-strength thin-walled gray iron casting,
Easily occur supercooling D types graphite to solve prior art Thin-wall Gray Iron in casting process and make casting strength, hardness and wear-resisting
Not the problem of property does not reach desirable.
To achieve the above object, the technical solution adopted in the present invention is：A kind of high-strength thin-walled gray iron casting, it is applied
The chemical composition contained in automobile brake drum, the gray iron casting is by mass percentage：C 3.3~3.6%, Si 1.6
~1.9%, Mn 0.6~0.9%, P≤0.1%, S≤0.04%, Cr 0.2~0.4%, Cu 0.25~0.5%, Ti
0.05%~0.15%, Ni≤0.1%, Sn 0.04%~0.08%, Pb≤0.0015%, As≤0.0013%, Al≤
0.04%, surplus is Fe.
Carbon：It is most economical, most basic intensified element in cast iron, by solution strengthening and precipitation strength effect to improve casting
There is more graphite flake in the intensity of iron, the microstructure to make cast iron, to ensure that it has higher thermal conductivity, passenger car system
The carbon content for moving drum should be more than 3.3%, but too high carbon amounts can cause higher fragility, thus for ensure higher-strength and
Higher thermal conductivity, by carbon content control between 3.3~3.6%.
Silicon：Solution strengthening effect is played in cast iron, and purity of steel and deoxidation can be improved, but content is too high can reduce casting
The toughness of iron, and Cast Iron Surface is produced the surface defects such as red iron sheet, it is higher in inoculation and casting processing
Carbon amounts and relatively low silicon amount can guarantee that the good mobility of molten iron, therefore Si contents of the present invention control is 1.6~1.9%.
Manganese：Ferrite can be dissolved in, the intensity of cast iron is improved, moreover it is possible to MnS is formed with S, to eliminate S illeffects, together
When be also important obdurability element, the too high toughness for being adversely affected to casting center segregation, impairing casting of Mn contents.This
The content for inventing Mn is controlled 0.6~0.9%.
Phosphorus：For the harmful element in cast iron, steadite is formed, increases strict control P≤0.1% in fragility, the present invention.
Sulphur：For the harmful element in cast iron, the multiple compounds such as MnS, TiS are formed in cast iron, appropriate sulphur, which has, to be changed
Kind pregnant effect, promotes strict control S≤0.04% in A type graphite, the present invention.
Chromium：The intensity and hardness of cast iron can be improved, too high levels easily increase casting mold difficulty and form air chill, the present invention
Cr contents control 0.2~0.4%.
Copper：Energy increase and stabilizing pearlite simultaneously promote graphitization, can offset the adverse effect of the increase spoken parts in traditional operas of Cr elements, have
Beneficial to the Production Practice of Casting Technologies for ensureing molten iron, while Cu is a kind of preferable cheap metallic element of heat conductivility, can be significantly
The thermal fatigue and thermal conductivity of cast iron are improved, is 0.2~0.4% in Cr contents, Cu of the invention better suited scope is
0.25~0.5%.
Titanium：It is the formation element of strong carbide, trickle TiC particles, crystal grain thinning can be formed；TiC can effectively pin Austria
Family name's body crystal boundary, effectively controls Austenite Grain Growth, and precipitations of the TiC in crystal grain can significantly increase the intensity of cast iron；Titanium
It is constitutional supercooling element, promotes undercooled graphite to be formed if titanium is too high, is unfavorable for improving A type graphite ratio, reduces heat conductivility,
If titanium amount is too low, raising intensity effect is not obvious, does not reach intensity requirement.The Ti contents control of the present invention 0.05~
0.15%.
Nickel：Promote graphitization during eutectic, reduce austenite transformation temperature, expand austenitic area, can refine and increase pearl
Body of light, at the same can also effectively prevent Cu it is hot-short caused by check crack, too high levels easily cause iron oxidation iron sheet be difficult to come off and
Increase cost, therefore present invention control Ni≤0.1%.
Tin：It can promote and stabilizing pearlite, the Quench chilling tendency of cast iron can be increased by adding micro Sn；Increase tin
Content can improve the hardness of cast iron, but too high Sn can increase carbide, cause fragility to increase, and intensity declines；Work as Sn
When≤0.08%, with the increase of Theil indices, expansion rate declines before solidification, and shrinkage factor is improved before eutectoid, under eutectoid post-shrinkage ratio
Drop, total shrinkage is improved.Therefore present invention control Sn content is between 0.04%~0.08%.
Lead, arsenic, aluminium are the major impurity elements in the pig iron, the past think always these impurity elements be it is very harmful,
Lead deteriorates graphite form in cast iron makes graphite produce variation, and arsenic belongs to strong air chill element, makes graphite that point-like be subcooled into strongly
Or disappear, seepage is suppressed in influence, and the presence of aluminium element is also easy to produce subcutaneous blowhole, while a joint effect of these elements is to increase
The super cooling tendency that big Graphite in Cast Iron is separated out, forms supercooling D type graphite in cast iron, and the intensity and hardness to gray cast iron are caused
Influence, but research finds that in A type graphite area, the main integrated distribution of lead, arsenic, aluminium is on matrix, and control lead, arsenic, aluminium element contain
Measuring (Pb≤0.0015%, As≤0.0013%, Al≤0.04%) not only reduces the influence of lead, arsenic, aluminium to graphite form, reduces
The generation of D type graphite, and micro lead, arsenic, aluminium concentrates and stay on matrix, matrix can be made to be strengthened, reach change evil into
Profit, the purpose for making impurity element change alloying element.
Crystal type graphite and 75 silicon iron inoculators are handled as first time inoculation agent of the invention in ladle, knot
Crystalline graphite and 75 ferrosilicon can improve the mobility of molten iron, prevent chilling tendency and depressed phenomenon, improve casting machinability, can promote
Enter graphite eutectic growth and be preferably minimized degree of supercooling, reduce D type graphitizations, increase eutectic cell quantity, refine matrix, carry
The intensity and hardness of high casting.
Silicon strontium random inoculant is as second of inoculation agent of the invention, with stronger reduction spoken parts in traditional operas ability, application
In thin-section casting, the chilling tendency of minimum can be obtained, is inclined to while reducing the shrinkage porosite as caused by high eutectic cell quantity.
The beneficial effects of the present invention are：The present invention is by determining rational chemical composition, improving fusion temperature and reinforcing
Breed, make Thin Section Gray Iron Castings that there is higher intensity and hardness and stronger heat-resisting and wearability, brake hubs can be satisfied with and existed
The requirement of the performances such as tensile strength, hardness, heat-resistant antifriction, its tensile strength reaches more than 290Mpa, and hardness is 190~210HB,
Metallographic structure is：A type graphite more than 95%, 4~6 grades of graphite length, pearlite >=98%.
Embodiment
With reference to specific embodiment, the present invention will be described in detail, and the description of this part is only exemplary and explained
Property, there should not be any restriction effect to protection scope of the present invention.
A kind of high-strength thin-walled gray iron casting of the present invention, it is applied to contain in automobile brake drum, the gray iron casting
Chemical composition be by mass percentage：C 3.3~3.6%, Si 1.6~1.9%, Mn 0.6~0.9%, P≤0.1%,
S≤0.04%, Cr 0.2~0.4%, Cu 0.25~0.5%, Ti 0.05%~0.15%, Ni≤0.1%, Sn 0.04%
~0.08%, Pb≤0.0015%, As≤0.0013%, Al≤0.04%, surplus is Fe.
In above-mentioned technical proposal, the tensile strength of the gray iron casting reaches more than 290Mpa, and hardness is 190~210HB,
Its metallographic structure is：A type graphite more than 95%, 4~6 grades of graphite length, pearlite >=98%.
A kind of preparation method of high-strength thin-walled gray iron casting as described above, comprises the following steps：Found molten iron, iron
Water inoculation, casting；
It is described to found in molten iron step, using the pig iron as primary raw material, the melt iron in intermediate frequency furnace, and respectively in stove
Interior addition alloying element so that the mass percent of each chemical composition is in molten iron：C 3.3~3.6%, Si 1.6~1.9%,
Mn 0.6~0.9%, P≤0.1%, S≤0.04%, Cr 0.2~0.4%, Cu 0.25~0.5%, Ti 0.05%~
0.15%th, Ni≤0.1%, Pb≤0.0015%, As≤0.0013%, Al≤0.04%, Sn 0.04%~0.08%, surplus
For Fe；
In the molten steel preparation process step, the molten iron founded is poured into casting ladle, crystal type graphite is added into casting ladle
With 75 silicon iron inoculators, breed for the first time, skimmed after tapping a blast furnace；Wherein molten iron pour into the tapping temperature of casting ladle for 1520~
1540℃；
In the casting step, ladle is transported in pouring truck and poured into a mould, in casting process, silicon strontium is added with stream with stream
Inovulant, is bred for the second time；Wherein, the cast temperature that molten iron pours into casting mold is 1420~1480 DEG C.
In above-mentioned technical proposal, in the molten steel preparation process step, on the basis of molten iron, crystallize by mass percentage
Content≤0.3% of content≤0.2% of type graphite, 75 silicon iron inoculators；Thickness≤3mm of the crystal type graphite.
In above-mentioned technical proposal, in the casting step, on the basis of molten iron, silicon strontium current-following inoculation by mass percentage
Content≤0.15% of agent；Particle diameter≤0.6mm of the silicon strontium.
Embodiment 1：High-strength thin-walled gray iron casting
Preparation method：(1) molten iron is founded：Using the pig iron as primary raw material, the melt iron in intermediate frequency furnace, and exist respectively
Alloying element is added in stove so that the mass percent of each chemical composition is in molten iron：C 3.6%, Si 1.6%, Mn
0.8%th, P 0.1%, S 0.04%, Cr 0.2%, Cu 0.5%, Ti 0.1%, Ni 0.1%, Pb 0.0015%, As
0.0013%th, Al 0.04%, Sn 0.04%, surplus is Fe；(2) molten steel preparation is handled：The molten iron founded is poured into casting ladle,
To casting ladle bottom add thickness for 3mm crystal type graphite and 75 silicon iron inoculators, carry out for the first time breed, wherein using molten iron as
Benchmark, the content of the crystal type graphite added by mass percentage is that the content of 0.2%, 75 silicon iron inoculators is 0.3%, is gone out
Skimmed after iron；The tapping temperature that wherein molten iron pours into casting ladle is 1540 DEG C；(3) cast：Ladle is transported in pouring truck and poured into a mould,
In casting process, with stream add particle diameter be 0.6mm silicon strontium powder as random inoculant, bred for the second time, using molten iron as
Benchmark, the content of silicon strontium random inoculant is 0.15% by mass percentage；Wherein, the cast temperature that molten iron pours into casting mold is
1420℃。
The tensile strength of Thin Section Gray Iron Castings made from the present embodiment is 330Mpa, and hardness is 210HB, its metallographic structure
For：A type graphite more than 95%, 6 grades of graphite length, pearlite >=98%.
Embodiment 2：High-strength thin-walled gray iron casting
Preparation method：(1) molten iron is founded：Using the pig iron as primary raw material, the melt iron in intermediate frequency furnace, and exist respectively
Alloying element is added in stove so that the mass percent of each chemical composition is in molten iron：C 3.3%, Si 1.9%, Mn
0.9%th, P 0.08%, S 0.03%, Cr 0.4%, Cu 0.25%, Ti 0.15%, Ni 0.07%, Pb 0.001%, As
0.001%th, Al 0.03%, Sn 0.06%, surplus is Fe；(2) molten steel preparation is handled：The molten iron founded is poured into casting ladle,
To casting ladle bottom add thickness for 3mm crystal type graphite and 75 silicon iron inoculators, carry out for the first time breed, wherein using molten iron as
Benchmark, the content of the crystal type graphite added by mass percentage is that the content of 0.15%, 75 silicon iron inoculators is 0.2%,
Skimmed after tapping a blast furnace；The tapping temperature that wherein molten iron pours into casting ladle is 1520 DEG C；(3) cast：Ladle is transported in pouring truck and poured
Note, in casting process, with stream add particle diameter be 0.6mm silicon strontium powder as random inoculant, bred for the second time, with molten iron
On the basis of, the content of silicon strontium random inoculant is 0.1% by mass percentage；Wherein, molten iron pours into the cast temperature of casting mold
For 1480 DEG C.
The tensile strength of Thin Section Gray Iron Castings made from the present embodiment is 316Mpa, and hardness is 200HB, its metallographic structure
For：A type graphite more than 95%, 5 grades of graphite length, pearlite >=98%.
Embodiment 3：High-strength thin-walled gray iron casting
The preparation method be the same as Example 1 of the present embodiment, difference is, the mass percent of each chemical composition in molten iron
For：C 3.5%, Si 1.7%, Mn 0.6%, P 0.05%, S 0.01%, Cr 0.3%, Cu 0.4%, Ti 0.05%, Ni
0.03%th, Pb 0.0008%, As 0.0012%, Al 0.01%, Sn 0.08%, surplus is Fe.The present embodiment is obtained to be made
The tensile strength for moving drum is 290Mpa, and hardness is 190HB, and its metallographic structure is：A type graphite more than 95%, 4 grades of graphite length,
Pearlite >=98%.
Described above is only presently preferred embodiments of the present invention, not makes any limit to the technical scope of the present invention
System, therefore any subtle modifications, equivalent variations and modifications that every technical spirit according to the present invention is made to above example,
Still fall within the range of technical scheme.
Claims (5)
1. a kind of high-strength thin-walled gray iron casting, it is applied to automobile brake drum, it is characterised in that：Contain in the gray iron casting
Chemical composition be by mass percentage：C 3.3~3.6%, Si 1.6~1.9%, Mn 0.6~0.9%, P≤0.1%,
S≤0.04%, Cr 0.2~0.4%, Cu 0.25~0.5%, Ti 0.05%~0.15%, Ni≤0.1%, Sn 0.04%
~0.08%, Pb≤0.0015%, As≤0.0013%, Al≤0.04%, surplus is Fe.
2. high-strength thin-walled gray iron casting as claimed in claim 1, it is characterised in that：The tensile strength of the gray iron casting reaches
To more than 290Mpa, hardness is 190~210HB, and its metallographic structure is：A type graphite more than 95%, 4~6 grades of graphite length, pearl
Body of light >=98%.
3. a kind of preparation method of high-strength thin-walled gray iron casting as described in claim 1~2, it is characterised in that including with
Lower step：Found molten iron, molten steel preparation processing, casting；
It is described to found in molten iron step, using the pig iron as primary raw material, the melt iron in intermediate frequency furnace, and add respectively in stove
Enter alloying element so that the mass percent of each chemical composition is in molten iron：C 3.3~3.6%, Si 1.6~1.9%, Mn
0.6~0.9%, P≤0.1%, S≤0.04%, Cr 0.2~0.4%, Cu 0.25~0.5%, Ti 0.05%~0.15%,
Ni≤0.1%, Pb≤0.0015%, As≤0.0013%, Al≤0.04%, Sn 0.04%~0.08%, surplus is Fe；
In the molten steel preparation process step, the molten iron founded is poured into casting ladle, crystal type graphite and 75 is added into casting ladle
Silicon iron inoculator, breed for the first time, is skimmed after tapping a blast furnace；The tapping temperature that wherein molten iron pours into casting ladle is 1520~1540
℃；
In the casting step, ladle is transported in pouring truck and poured into a mould, in casting process, silicon strontium current-following inoculation is added with stream
Agent, is bred for the second time；Wherein, the cast temperature that molten iron pours into casting mold is 1420~1480 DEG C.
4. the preparation method of high-strength thin-walled gray iron casting as claimed in claim 3, it is characterised in that：At the molten steel preparation
Manage in step, on the basis of molten iron, content≤0.2% of crystal type graphite, 75 silicon iron inoculators contain by mass percentage
Amount≤0.3%；Thickness≤3mm of the crystal type graphite.
5. the preparation method of high-strength thin-walled gray iron casting as claimed in claim 4, it is characterised in that：The casting step
In, on the basis of molten iron, content≤0.15% of silicon strontium random inoculant by mass percentage；The particle diameter of the silicon strontium≤
0.6mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710485857.0A CN107177773A (en) | 2017-06-23 | 2017-06-23 | A kind of high-strength thin-walled gray iron casting |
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| CN201710485857.0A CN107177773A (en) | 2017-06-23 | 2017-06-23 | A kind of high-strength thin-walled gray iron casting |
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ID=59845297
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| CN201710485857.0A Pending CN107177773A (en) | 2017-06-23 | 2017-06-23 | A kind of high-strength thin-walled gray iron casting |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107718048A (en) * | 2017-10-13 | 2018-02-23 | 江苏捷帝机器人股份有限公司 | A kind of robot of adjustable weight balancing weight casting |
| CN107815517A (en) * | 2017-12-07 | 2018-03-20 | 江铃汽车股份有限公司 | A kind of method for strengthening grey cast-iron pregnant effect |
| CN108277427A (en) * | 2018-03-06 | 2018-07-13 | 芜湖久弘重工股份有限公司 | A kind of method of smelting of the high tough gray cast iron of NC rotary table |
| CN108315633A (en) * | 2018-01-26 | 2018-07-24 | 清华大学 | A kind of high conductive high strength gray cast iron and preparation method thereof |
| CN108359880A (en) * | 2018-03-06 | 2018-08-03 | 芜湖久弘重工股份有限公司 | A kind of high tough gray cast iron liquid Metallurgical processing method of numerically-controlled machine tool casting |
| CN111304522A (en) * | 2020-03-09 | 2020-06-19 | 陕西柴油机重工有限公司 | Method for improving hardness of large-scale high-grade gray cast iron diesel engine body |
| CN112589054A (en) * | 2020-12-20 | 2021-04-02 | 十堰市泰祥实业股份有限公司 | Sand-lined casting method for gray cast iron automobile engine main bearing cap iron mold |
| CN114574752A (en) * | 2022-02-25 | 2022-06-03 | 宁国东方碾磨材料股份有限公司 | Free-cutting gray cast iron alloy for cylinder block and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107718048A (en) * | 2017-10-13 | 2018-02-23 | 江苏捷帝机器人股份有限公司 | A kind of robot of adjustable weight balancing weight casting |
| CN107815517A (en) * | 2017-12-07 | 2018-03-20 | 江铃汽车股份有限公司 | A kind of method for strengthening grey cast-iron pregnant effect |
| CN107815517B (en) * | 2017-12-07 | 2019-11-19 | 江铃汽车股份有限公司 | A method of strengthening grey cast-iron pregnant effect |
| CN108315633A (en) * | 2018-01-26 | 2018-07-24 | 清华大学 | A kind of high conductive high strength gray cast iron and preparation method thereof |
| CN108277427A (en) * | 2018-03-06 | 2018-07-13 | 芜湖久弘重工股份有限公司 | A kind of method of smelting of the high tough gray cast iron of NC rotary table |
| CN108359880A (en) * | 2018-03-06 | 2018-08-03 | 芜湖久弘重工股份有限公司 | A kind of high tough gray cast iron liquid Metallurgical processing method of numerically-controlled machine tool casting |
| CN111304522A (en) * | 2020-03-09 | 2020-06-19 | 陕西柴油机重工有限公司 | Method for improving hardness of large-scale high-grade gray cast iron diesel engine body |
| CN112589054A (en) * | 2020-12-20 | 2021-04-02 | 十堰市泰祥实业股份有限公司 | Sand-lined casting method for gray cast iron automobile engine main bearing cap iron mold |
| CN114574752A (en) * | 2022-02-25 | 2022-06-03 | 宁国东方碾磨材料股份有限公司 | Free-cutting gray cast iron alloy for cylinder block and preparation method thereof |
| CN114574752B (en) * | 2022-02-25 | 2023-02-28 | 宁国东方碾磨材料股份有限公司 | Free-cutting gray cast iron alloy for cylinder block and preparation method thereof |
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