CN106544477A - The production technology of high-strength abrasion-proof type isothermal hardening vermicular cast iron - Google Patents
The production technology of high-strength abrasion-proof type isothermal hardening vermicular cast iron Download PDFInfo
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- CN106544477A CN106544477A CN201610871395.1A CN201610871395A CN106544477A CN 106544477 A CN106544477 A CN 106544477A CN 201610871395 A CN201610871395 A CN 201610871395A CN 106544477 A CN106544477 A CN 106544477A
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/607—Molten salts
-
- 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
- C21D5/00—Heat treatments of cast-iron
-
- 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
- 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
- C21D2211/002—Bainite
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A kind of production technology of high-strength abrasion-proof type isothermal hardening vermicular cast iron; vermicular cast iron workpiece loads protective pot and fills up graininess Linesless charcoal; after protective pot is added a cover, it is put into during temperature is 870 DEG C ± 10 DEG C of cabinet-type electric furnace, in the austenitizing temperature constant temperature 1 hour～2 hours of setting；By preheated vermicular cast iron workpiece, by hanging out in the protective pot in batch-type furnace, being put into the salt bath in crucible furnace Nei carries out isothermal processes at 290 DEG C ± 20 DEG C；After the vermicular cast iron workpiece that isothermal processes are completed in crucible furnace salt bath is taken out, room temperature is cooled in atmosphere.Advantage is：The Technology for Heating Processing is simple, easy to operate, low production cost；The intensity of the vermicular cast iron, hardness and wearability index should reach 2 times～more than 3 times of the compacted ferrum of common as cast condition.
Description
Technical field
The invention belongs to a kind of production technology of cast iron material in ferrous materials production field, is by adopting salt bath
The special thermal treatment means of isothermal hardening, common vermicular cast iron is transformed into high intensity, high rigidity and high-wearing feature, while
Keep a kind of life of high-strength abrasion-proof type isothermal hardening vermicular cast iron with lower bainite tissue structure of good impact flexibility
Production. art.
Background technology
Vermicular cast iron is a kind of cast iron material that eighties of last century mid-term grows up, the existing spheroidal graphite cast-iron that is similar to
Intensity and toughness, have again similar to the good casting manufacturability of grey cast-iron, good heat conductivity, thermal fatigue resistance and good
Damping performance, and low production cost, therefore, increasing application has been obtained in every field at present.But it is based on its group
Graphite features in knitting, although being better than grey cast-iron in terms of mechanical property, are compared with various cast steels and spheroidal graphite cast-iron, are remained
In larger gap, the effect for being particularly which by normative heat treatment reinforcing is extremely limited.Therefore, the application of the material is not still wide
It is general, if improving its intensity, hardness and wearability by heat treatment phase-change method, so that it may significantly increase its range of application.
Due to the special organizational structure feature of vermicular graphite iron material, domestic and international relevant industries carry out Post isothermal treatment to which
Process is mainly annealed and normalizing, and the technique for carrying out normal quenching process to which is still immature, carries out bainite etc. to which
The relevant report of warm Quenching Treatment is also little.To develop and expanding the range of application of common vermicular cast iron, compacted ink has been researched and developed
The Technology for Heating Processing of cast iron isothermal hardening, makes common vermicular cast iron be changed into a kind of compacted ferrum new material with higher performance, both
AVI materials (Austempered vermicular graphite Iron).
At present, both at home and abroad for common vermicular cast iron mechanical property and metallographic structure be distinctly claimed, in GB/
T26555-2011《Pieces of vermicular cast iron》The 7th article in standard, for the mechanical property of vermicular cast iron single casting sample is defined as：
RuT300-RuT500 materials, its Rm=300-500PMa；Rp0.2=210-350PMa；A=2.0% -0.5%；HBW=
140—260.Its graphite nodulizing rate >=80%；Its matrix be ferrite, pearlite, ferrite+pearlite.It is right in standard
In the impact flexibility no standard of compacted iron material.The concrete mechanical property requirements of single casting sample are shown in Table 1：
To vermicular cast iron performance and the technical requirements of tissue in 1 GB of table
| The trade mark | Tensile strength | Yield strength | Percentage elongation | Brinell hardness | Main base is organized |
| RuT300 | 300 | 210 | 2.0 | 140-210 | Ferrite |
| RuT350 | 350 | 245 | 1.5 | 160-220 | Ferrite+pearlite |
| RuT400 | 400 | 280 | 1.0 | 180-240 | Pearlite+ferrite |
| RuT450 | 450 | 315 | 1.0 | 200-250 | Pearlite |
| RuT500 | 500 | 350 | 0.5 | 220-260 | Pearlite |
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of RuT300, RuT350 to meet national technical standard requirement
For original material, after salt bath austempering heat treatment, the high-strength abrasion-proof type isothermal with more strong mechanical performance is obtained
The production technology of quenching vermicular cast iron, the intensity of the vermicular cast iron, hardness and wearability index should reach the 2 of the compacted ferrum of common as cast condition
Times～more than 3 times.
The present invention technical solution be：
A kind of production technology of high-strength abrasion-proof type isothermal hardening vermicular cast iron, which comprises the following steps that：
(1) surface of the work is processed
To dispel oil processing through rust cleaning through mach vermicular cast iron surface of the work, surface contaminants will be prevented to product isothermal hardening
Effect produces impact；
(2) preparation and fusing of quenching salt
Prepare in advance and melt isothermal hardening salt in salt bath, quenching salt includes potassium nitrate (KNO according to weight content3)
48%～52% and sodium nitrite (NaNO2) 48%～52% (technical pure) two kinds of solid salts；Two kinds of solid salts are uniformly mixed
Together；Then account for quenching salt gross mass 1/5 quenching salt is inserted in salt bath, is melted in crucible furnace, crucible
Stove constant temperature then heats to 290 DEG C ± 20 DEG C of hardening heat at 250 DEG C, after insulation is completely melt to which, then remaining quenching is used
Salt continues to insert in salt bath, and molten condition of the quenching salt in salt bath is kept in adding procedure, until quenching is complete with salt
Portion inserts, and after all melting, is incubated at 290 DEG C ± 20 DEG C, standby；
(3) workpiece preheating
Vermicular cast iron workpiece loads protective pot and fills up graininess Linesless charcoal, after protective pot is added a cover, is put into temperature for 870 DEG C ± 10 DEG C
Cabinet-type electric furnace in, in the austenitizing temperature constant temperature 1 hour～2 hours of setting；
(4) isothermal hardening
By preheated vermicular cast iron workpiece, by hanging out in the protective pot in batch-type furnace, be put into the salt bath in crucible furnace Nei
290 DEG C ± 20 DEG C carry out isothermal processes；
(5), after take out the vermicular cast iron workpiece that isothermal processes are completed in crucible furnace salt bath, room temperature is cooled in atmosphere.
In the vermicular cast iron workpiece mass content of C for 3.5%～3.8%, Si mass content be 2.4%～
Mass content≤0.15% of 2.6%, Mn, mass content≤0.02% of S, mass content≤0.03% of P, the quality of Ni contain
Measure as 0.5%～0.7%.
Graphite form in the vermicular cast iron workpiece has more than 80% for vermiform, and remaining is spherical or bulk.
The matrix more than 90% of the vermicular cast iron workpiece should be ferrite, and remaining is pearlite.
Isothermal quenching time is according to the determination of workpiece effective thickness, generally 1.0 Fen Zhong/㎜～1.5 Fen Zhong/㎜.
By vermicular cast iron original material is made at the isothermal hardening heat that the new compacted iron material of high-strength, high-anti-friction is carried out
Reason, its operation strictly must be carried out by Fig. 5 heat treatment cycle curves, wherein, to workpiece and the concrete isothermal quenching time of sample
Should be depending on workpiece effective thickness, generally 1.0 Fen Zhong/㎜～1.5 Fen Zhong/㎜.
Ultimate principle and performance：
After casting, the microscopic structure of common vermicular cast iron is evenly distributed on ferrite or ferrite+a small amount of pearly-lustre for quasiflake graphite
On body matrix.Either ferrite or pearlite, its intensity and hardness it is all very low, due to a large amount of presence of graphite on matrix,
Matrix is isolated, therefore under its plasticity and toughness are also extremely low, and the characteristics of due to quasiflake graphite, has determined which cannot be realized
Conventional quenching phase transformation strengthening, therefore the overall mechanical property not high (between magnesium iron and gray iron) of common vermicular cast iron, this is just
Limit the range of application of the material.
By the special isothermal hardening means being related in the present invention, can make matrix ferrite in common vermicular cast iron or
Ferrite+pearlite isothermal transformation is the lower bainite with needle shape, and this lower bainite is relatively low by high temperature austenite
At a temperature of, isothermal transformation, its fine structure be on acicular ferrite matrix the superfine carbide of short range disperse educt and analyse
Go out dispersion hardening, so as to greatly improve intensity, hardness and the anti-wear performance of vermicular cast iron.
Beneficial effects of the present invention：
The Technology for Heating Processing is simple, easy to operate, low production cost.Common vermicular graphite iron material is at a kind of special warm
After reason (salt bath austempering), it is transformed into one kind and there is high intensity, high rigidity, high-wearing feature, while the good toughness of holding, modeling
Property, the cast iron material (AVI materials) of high heat conductivity and high thermal fatigue resistance, should so as to can expand vermicular cast iron
With field and use range.
The tensile strength of the vermicular cast iron of the original as cast condition used in the present invention is 275MPa, and yield strength is 205MPa,
Percentage elongation is 1.8%, and Brinell hardness is 166HBW, and standard V notched specimen ballistic work is 4.1J.
And the new vermicular graphite iron material obtained after isothermal hardening, its tensile strength is 866MPa, and yield strength is
723MPa, percentage elongation are 1.2%, and Brinell hardness is 420HBW, and standard V notched specimen ballistic work is 4.0J.It can be seen that common compacted ink
Cast iron in the case where its plasticity and impact flexibility reduction are atomic, significantly can be resisted by which after special isothermal hardening
Tensile strength, yield strength and hardness and wearability.
Description of the drawings
Fig. 1 is 500 times of micro-organization charts of the new compacted ferroelectric sample obtained in the present invention (correspondence embodiment 1)；
Fig. 2 is 100 times of micro-organization charts of the new compacted ferroelectric sample obtained in the present invention (correspondence embodiment 1)；
Fig. 3 is 100 times of micro-organization charts of the new compacted ferroelectric sample obtained in the present invention (correspondence embodiment 2)；
Fig. 4 is 100 times of micro-organization charts of the new compacted ferroelectric sample obtained in the present invention (correspondence embodiment 3)；
Fig. 5 is that vermicular cast iron same temperature hardening heat treatment process curve of the present invention and operation are required.
Specific embodiment
Embodiment
(1) isothermal quenching device and material prepare
(1.1) it is≤1000 DEG C of 12KW cabinet-type electric furnaces to heat warm area, and temperature-controlled precision is ± 3 DEG C.
(1.2) isothermal equipment be heat warm area≤1000 DEG C 12KW crucible electrical resistance furnaces, temperature-controlled precision ± 1 DEG C.
(1.3) the rustless steel salt bath one of crucible furnace size of burner hearth requirement, industrial potassium nitrate and nitrous acid are met
Sodium is some.
(1.4) one, the stainless steel protection tank of the certain size of heated protective, fresh granules shape Linesless charcoal is some.
(2) used qualified as cast condition vermicular cast iron original material standard requires to perform by table 2：
Table 2 tests composition and the metallographic structure with original vermicular cast iron
Embodiment 1 (290 DEG C × 1h isothermal hardening)
(1) surface of the work is processed
Will be through mach vermicular cast iron workpiece (composition and metallographic structure meet table 2 and require) surface at oil is dispelled in rust cleaning
Reason, prevents surface contaminants from producing impact to product isothermal hardening effect；
(2) preparation and fusing of quenching salt
Prepare in advance and melt isothermal hardening salt in salt bath, quenching salt includes potassium nitrate (KNO according to weight content3)
52% and sodium nitrite (NaNO2) 48% (technical pure) two kinds of solid salts；Two kinds of solid salts are homogenously mixed together；Then to
Account for quenching salt gross mass 1/5 quenching salt is inserted in salt bath, in crucible furnace melt, crucible furnace constant temperature at 250 DEG C,
290 DEG C of hardening heat is then heated to, after insulation is completely melt to which, then remaining quenching salt is continued to insert in salt bath,
Molten condition of the quenching salt in salt bath is kept in adding procedure, until quenching salt is all inserted, after all melting,
290 DEG C of insulations, it is standby；
(3) workpiece preheating (normalizing)
Vermicular cast iron workpiece (thickness 60mm) loads protective pot and fills up graininess Linesless charcoal, and after protective pot is added a cover, being put into temperature is
In 880 DEG C of cabinet-type electric furnace, in the austenitizing temperature constant temperature 1 hour of setting；
(4) isothermal hardening
By preheated vermicular cast iron workpiece, by hanging out in the protective pot in batch-type furnace, be put into the salt bath in crucible furnace Nei
290 DEG C carry out isothermal processes 1 hour；
(5), after take out the vermicular cast iron workpiece that isothermal processes are completed in crucible furnace salt bath, room temperature is cooled in atmosphere, is obtained
To high-strength abrasion-proof type isothermal hardening vermicular cast iron workpiece；Workpiece fundamental tissue after process is 85% lower bainite+a small amount of residual
Remaining austenite；Electron microscope as shown in figure 1, as seen from Figure 1, the high-strength abrasion-proof type isothermal hardening vermicular cast iron workpiece 500
Times microscopic structure is uniform needle-like lower bainite+a small amount of retained austenite+quasiflake graphite.
Embodiment 2 (270 DEG C × 1.5h isothermal hardening)
(1) surface of the work is processed
Will be through mach vermicular cast iron workpiece (composition and metallographic structure meet table 2 and require) surface at oil is dispelled in rust cleaning
Reason, prevents surface contaminants from producing impact to product isothermal hardening effect；
(2) preparation and fusing of quenching salt
Prepare in advance and melt isothermal hardening salt in salt bath, quenching salt includes potassium nitrate (KNO according to weight content3)
48% and sodium nitrite (NaNO2) 52% (technical pure) two kinds of solid salts；Two kinds of solid salts are homogenously mixed together；Then to
Account for quenching salt gross mass 1/5 quenching salt is inserted in salt bath, in crucible furnace melt, crucible furnace constant temperature at 250 DEG C,
270 DEG C of hardening heat is then heated to, after insulation is completely melt to which, then remaining quenching salt is continued to insert in salt bath,
Molten condition of the quenching salt in salt bath is kept in adding procedure, until quenching salt is all inserted, after all melting,
270 DEG C of insulations, it is standby；
(3) workpiece preheating
Vermicular cast iron workpiece (thickness 60mm) loads protective pot and fills up graininess Linesless charcoal, and after protective pot is added a cover, being put into temperature is
In 870 DEG C of cabinet-type electric furnace, in the austenitizing temperature constant temperature 90 minutes of setting；
(4) isothermal hardening
By preheated vermicular cast iron workpiece, by hanging out in the protective pot in batch-type furnace, be put into the salt bath in crucible furnace Nei
270 DEG C carry out isothermal processes 1.5 hours；
(5), after take out the vermicular cast iron workpiece that isothermal processes are completed in crucible furnace salt bath, room temperature is cooled in atmosphere, is obtained
To high-strength abrasion-proof type isothermal hardening vermicular cast iron workpiece；Workpiece fundamental tissue after process is 95% lower bainite+a small amount of residual
Remaining austenite；Electron microscope as shown in figure 1, as seen from Figure 1, the high-strength abrasion-proof type isothermal hardening vermicular cast iron workpiece 500
Times microscopic structure is uniform needle-like lower bainite+a small amount of retained austenite+quasiflake graphite.
Embodiment 3 (310 DEG C × 2h isothermal hardening)
(1) surface of the work is processed
Will be through mach vermicular cast iron workpiece (composition and metallographic structure meet table 2 and require) surface at oil is dispelled in rust cleaning
Reason, prevents surface contaminants from producing impact to product isothermal hardening effect；
(2) preparation and fusing of quenching salt
Prepare in advance and melt isothermal hardening salt in salt bath, quenching salt includes potassium nitrate (KNO according to weight content3)
50% and sodium nitrite (NaNO2) 50% (technical pure) two kinds of solid salts；Two kinds of solid salts are homogenously mixed together；Then to
Account for quenching salt gross mass 1/5 quenching salt is inserted in salt bath, in crucible furnace melt, crucible furnace constant temperature at 250 DEG C,
310 DEG C of hardening heat is then heated to, after insulation is completely melt to which, then remaining quenching salt is continued to insert in salt bath,
Molten condition of the quenching salt in salt bath is kept in adding procedure, until quenching salt is all inserted, after all melting,
310 DEG C of insulations, it is standby；
(3) workpiece preheating
Vermicular cast iron workpiece (thickness 60mm) loads protective pot and fills up graininess Linesless charcoal, and after protective pot is added a cover, being put into temperature is
In 860 DEG C of cabinet-type electric furnace, in the austenitizing temperature constant temperature 2 hours of setting；
(4) isothermal hardening
By preheated vermicular cast iron workpiece, by hanging out in the protective pot in batch-type furnace, be put into the salt bath in crucible furnace Nei
310 DEG C carry out isothermal processes 2 hours；
(5), after take out the vermicular cast iron workpiece that isothermal processes are completed in crucible furnace salt bath, room temperature is cooled in atmosphere, is obtained
To high-strength abrasion-proof type isothermal hardening vermicular cast iron workpiece；Workpiece fundamental tissue after process is 95% lower bainite+a small amount of residual
Remaining austenite；Electron microscope as shown in figure 1, as seen from Figure 1, the high-strength abrasion-proof type isothermal hardening vermicular cast iron workpiece 500
Times microscopic structure is uniform needle-like lower bainite+a small amount of retained austenite+quasiflake graphite.
Technology for detection：
Compacted ferroelectric sample after by the means of isothermal quenching of embodiment of the present invention 1- embodiment 3 is with original compacted ferroelectric sample, 870 DEG C of Jing just
The burning hot sample for processing carry out respectively contrast tension test, room temperature contrast impact test, contrast Bu Shi and Rockwell hardness determine, it is right
Specific wear is tested and metal lographic examination, contrast test data and the results are shown in Table 3：
Vermicular cast iron (compacted ferrum) the performance detection table of the original compacted ferrum of 3 embodiment of the present invention 1-3 of table and different isothermal processes
Conclusion：Can be seen by table 3, the new vermicular cast iron of isothermal hardening of 3 development tests of embodiment of the present invention 1- embodiment
Tensile strength all reach more than 800MPa, its yield strength all reach more than 700MPa, hardness all reach more than 400HB, far above original
The intensity and hardness number of beginning foundry goods and compacted ferrum normalizing part, and its impact flexibility is also showing that appearance is reduced as hardness is raised
As its anti-wear performance, with practical value.
The specific experiment example of the present invention is these are only, the extension of the present invention is not limited to and is extended, for ability
The technical staff in domain, can make the change for being conducive to producing according to the practical situation of oneself to the present invention.It is all the present invention
Within spirit and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (5)
1. a kind of production technology of high-strength abrasion-proof type isothermal hardening vermicular cast iron, is characterized in that：
Comprise the following steps that：
(1) surface of the work is processed
To dispel oil processing through rust cleaning through mach vermicular cast iron surface of the work；
(2) preparation and fusing of quenching salt
Prepare in advance and melt isothermal hardening salt in salt bath, quenching salt includes potassium nitrate (KNO according to weight content3)
48%～52% and sodium nitrite (NaNO2) 48%～52% (technical pure) two kinds of solid salts；Two kinds of solid salts are uniformly mixed
Together；Then account for quenching salt gross mass 1/5 quenching salt is inserted in salt bath, is melted in crucible furnace, crucible
Stove constant temperature then heats to 290 DEG C ± 20 DEG C of hardening heat at 250 DEG C, after insulation is completely melt to which, then remaining quenching is used
Salt continues to insert in salt bath, and molten condition of the quenching salt in salt bath is kept in adding procedure, until quenching is complete with salt
Portion inserts, and after all melting, is incubated at 290 DEG C ± 20 DEG C, standby；
(3) workpiece preheating
Vermicular cast iron workpiece loads protective pot and fills up graininess Linesless charcoal, after protective pot is added a cover, is put into temperature for 870 DEG C ± 10 DEG C
Cabinet-type electric furnace in, constant temperature 1 hour～2 hours；
(4) isothermal hardening
By preheated vermicular cast iron workpiece, by hanging out in the protective pot in batch-type furnace, be put into the salt bath in crucible furnace Nei
290 DEG C ± 20 DEG C carry out isothermal processes；
(5), after take out the vermicular cast iron workpiece that isothermal processes are completed in crucible furnace salt bath, room temperature is cooled in atmosphere.
2. the production technology of high-strength abrasion-proof type isothermal hardening vermicular cast iron according to claim 1, is characterized in that：It is described
In vermicular cast iron workpiece, the mass content of C contains for the quality of 2.4%～2.6%, Mn for the mass content of 3.5%～3.8%, Si
Mass content≤0.02% of≤0.15%, S of amount, mass content≤0.03% of P, the mass content of Ni is 0.5%～
0.7%.
3. the production technology of high-strength abrasion-proof type isothermal hardening vermicular cast iron according to claim 1, is characterized in that：It is described
Graphite form in vermicular cast iron workpiece has more than 80% for vermiform, and remaining is spherical or bulk.
4. the production technology of high-strength abrasion-proof type isothermal hardening vermicular cast iron according to claim 1, is characterized in that：It is described
The matrix more than 90% of vermicular cast iron workpiece should be ferrite, and remaining is pearlite.
5. the production technology of high-strength abrasion-proof type isothermal hardening vermicular cast iron according to claim 1, is characterized in that：Isothermal
Cool time is according to the determination of workpiece effective thickness, generally 1.0 Fen Zhong/㎜～1.5 Fen Zhong/㎜.
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| CN108342553A (en) * | 2018-03-19 | 2018-07-31 | 锦州捷通铁路机械股份有限公司 | The production technology of the full Soxhlet build vermicular cast iron of air blast cooling |
| CN108342553B (en) * | 2018-03-19 | 2019-05-07 | 锦州捷通铁路机械股份有限公司 | The production technology of the full Soxhlet figure vermicular cast iron of air blast cooling |
| CN113322372A (en) * | 2021-05-31 | 2021-08-31 | 东风商用车有限公司 | Engine cylinder cover and preparation method thereof |
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