CN110042305A - A kind of anti-corrosive properties, wearability high-chromium cast iron alloy and preparation method thereof - Google Patents
A kind of anti-corrosive properties, wearability high-chromium cast iron alloy and preparation method thereof Download PDFInfo
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- CN110042305A CN110042305A CN201910322384.1A CN201910322384A CN110042305A CN 110042305 A CN110042305 A CN 110042305A CN 201910322384 A CN201910322384 A CN 201910322384A CN 110042305 A CN110042305 A CN 110042305A
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Abstract
The invention belongs to wear-resistant metal material technical fields, disclose a kind of anti-corrosive properties, wearability high-chromium cast iron alloy and preparation method thereof, comprising: raw material preparation, atomization mixing powder, molding base, alternating temperature sintering, heat treatment is cooling, intermixture processing, finished product.Raw material proportioning of the present invention by adjusting high-chromium cast iron alloy blank, Lai Tigao corrosion resistance and impact resistance.And it is quenched with sulphur powder before pouring, cooperate heat treatment process, it can be avoided and more carbide is precipitated in austenite, condense fine microstructures, with preferable mechanical property, improve matrix and graphite size, shape and distribution, significantly improve corrosion resisting property, proposes the hardness of high-chromium cast iron alloy blank；Then high-chromium cast iron alloy part surface is modified using intermixture, while guaranteeing high-chromium alloy cast-iron high rigidity, improves the absorption impact resistance of high-chromium alloy cast-iron, and then improve its wearability.
Description
Technical field
The invention belongs to wear-resistant metal material technical field more particularly to a kind of anti-corrosive properties, wearability high-chromium cast iron alloy
And preparation method thereof.
Background technique
Currently, the immediate prior art:
White cast-iron common at present has closely been eliminated instead alloy white cast iron, since Chinese chromium resource is rich
It is rich and cheap, so chromium becomes the main adding elements of alloy white cast iron.It has often been said that rich chromium cast iron be primarily referred to as
High-cr-mo white cast iron can be divided into Cr15And Cr20Two classes, the former is for bearing general impact wear, and the latter is used for HI high impact
Abrasion and the biggish wearing piece of thickness, chrome content are more than that 30% rich chromium cast iron is generally used for heat-resisting or anti-corrosion part.
1930's is mainly contained in the U.S. almost while development nickel hard martensite white cast-iron
The research of the high-chromium white cast iron of 10%~30%Cr, then, Britain, the former Soviet Union, Germany etc. have also carried out a large amount of life in succession
Produce research.After the sixties, due to the extensive use of electric furnace, so that the development of this cast iron is very fast.High-chromium white cast iron due at
The characteristics of setting up meter separately there is tissue more better than nickel hard white iron, performance.The addition of chromium changes the carbide of white cast-iron
Type becomes M7C3 type carbide by the M3C type carbide in ordinary white cast iron, and which not only improves wearabilities, but also
Improve toughness.Therefore, it since rich chromium cast iron comes out, has had always been considered as being comparatively ideal wear-resistant material, application is very wide
It is general.Both at home and abroad to the service performance under the relationship and various abrasive conditions between the ingredient of rich chromium cast iron, microstructure and property into
It has gone a large amount of research, some researchs also has been carried out to crystallization rule in recent years.
High-chromium white cast iron is excellent wear-resistant material generally acknowledged both at home and abroad, but due to following both sides, answers it
Be restricted with field: first is that high production cost, this is not only cost of raw material height, but also needs electro-smelting；Second is that
It should not be used under the conditions of wet-milling in mine.Since the eighties, answered to further increase performance and the expansion of high-chromium white cast iron
With range, a large amount of research has been carried out.In terms of basic theory, T.Ohide and G.Ohira discovery after working as Cr > 10%, are closed
Basic variation has occurred in the coagulating property of gold, shows as mushy freezing, carbide is converted into hexagonal crystal by orthorhombic system M3C type
It is M7C3 type, microhardness is increased to 1500~1800HV by 1060~1240HV, obtains it under the conditions of corrosive wet-milling
Application to a certain extent.Vanadium is added in Japan, Britain, Germany into rich chromium cast iron, with the increase of vanadium amount, VC particle
(2800HV) is obviously increased, and is improved since the circumgranular chromium concn of VC is opposite, to improve the anti-corrosion of high-chromium white cast iron
Property and wearability.In order to solve, rich chromium cast iron is at high cost and the insufficient weakness of shock resistance, University of Science & Technology, Beijing Wu undertake the construction of
The method that people uses centrifugal casting produces rich chromium cast iron and spheroidal graphite cast-iron bimetallic composite roll circle, and service life is than current
Med-Mn ductile iron roller circle improve nearly 4 times, production cost than med-Mn ductile iron be higher by 20% or so.
High chromium white iron has excellent wear-resisting property and relatively good impact flexibility, has obtained extensively in wear-resisting field
Application may not apply to anti-corrosion field, this constrains its popularization and application to a certain extent but since rotproofness is poor.It is high
Chromium white cast iron is since its preferable using effect is in numerous rows such as metal smelt, coal, iron ore, chemical fertilizer manufacture, aluminium producings
Industry is widely used, more to the research of the microstructure and property of rich chromium cast iron, wearability at present, the corruption to rich chromium cast iron
Journal of Sex Research is less.
In conclusion problem of the existing technology is: the prior art is less to the rotten Journal of Sex Research of rich chromium cast iron, rotproofness
It is poor；Existing preparation process is handled using disposable thermal, and heat treatment temperature is higher, not can guarantee rich chromium cast iron intensity；Using
Once sintered or two-step sintering temperature is identical, is unfavorable for playing the potential of rich chromium cast iron.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of anti-corrosive properties, wearability high-chromium cast iron alloy and its
Preparation method.
The invention is realized in this way the preparation method of a kind of anti-corrosive properties, wearability high-chromium cast iron alloy.The anti-corrosion
Property, the preparation method of wearability high-chromium cast iron alloy include:
Step 1, raw material preparation；
Step 2 is atomized mixing powder；
Step 3 is molded base；
Step 4, alternating temperature sintering；
Step 5, heat treatment cooling；
Step 6, intermixture processing；
Step 7, finished product.
Further, the raw material preparation of the step 1 specifically includes:
High-chromium cast iron alloy includes carbon 0.8-1.2%, silicon 0.6-0.8%, chromium 18-22%, manganese 2.2- by element proportion
3.2%, vanadium 0.2-0.6%, phosphorus 0.01-0.03%, nickel 0.4-0.8%, molybdenum 0.2-0.5%, nitrogen 0.2-0.4%, zinc 0.06-
0.08%, surplus is copper, iron and inevitable impurity；
Further, the atomization mixing powder of the step 2 specifically includes:
By design rich chromium cast iron carry out mixing, abundant melting mixing, after in furnace 60~80% it is load melting after, be added
It is equivalent to the sulphur powder of its weight 0.01-0.03%, pre-alloyed powder is made in water atomization；
Further, the molding base of the step 3 specifically includes:
Forming agent is added into gained pre-alloyed powder, high-chromium cast iron alloy blank is obtained after compacting；
Further, the alternating temperature sintering of the step 4 specifically includes:
By gained green compact carry out alternating temperature sintering, upper limit sintering temperature be 1250~1280 DEG C, soaking time be 10~
30min is cooled to rapidly 1220~1245 DEG C of lower limit sintering temperature again later, and soaking time is 30~90min, obtains sintering sample
Base；
Further, the heat treatment cooling of the step 5 specifically includes:
Gained sintering sample blanks is air-cooled to room temperature in electric furnace after being heat-treated twice, polished with sand paper, dried after polishing,
Obtain workpiece；
Further, the content of heat treatment twice includes: to be heat-treated for the first time, is warming up to 750-780 DEG C, heat preservation 1-2 is small
When, it is warming up to 980-1020 DEG C after the completion, keeps the temperature 30-40 minutes, is cooled to 920-930 DEG C, keeps the temperature 1-2 hours, is cooled to room
Temperature；Second of heat treatment is 650-680 DEG C in temperature, keeps the temperature 3-4 hours, and water cooling to room temperature is then heated to 520-540 DEG C,
It is air-cooled to room temperature.
Further, the intermixture processing of the step 6 specifically includes:
Gained workpiece is placed in 75-85 DEG C of drying box, after heat preservation 6-8 hours, coats and mixes in work piece surface
Then agent, intermixture carry out high-frequency induction cladding, particular content are as follows: true with a thickness of 400-600 μm in vacuum heating apparatus
Under conditions of reciprocal of duty cycle is 55-75Pa, start high-frequency induction cladding equipment, increases electric current from 300-360A within the 50-60s time
To 880-900A, 60-80s is kept the temperature, high-frequency induction equipment is closed after electric current is down to 500-520A in 40s, is cooled to room temperature
?；
Wherein, the intermixture includes the raw material of following parts by weight: 22-26 parts of nickel 60,1-3 parts of boron carbide powders, 4-6 parts
Tungsten-carbide powder, 1-2 parts of lead powder ends, 10 parts of binders；
Further, the finished product of the step 7 specifically includes:
Treated high-chromium cast iron alloy part is put into electric furnace, is kept the temperature under conditions of temperature is 340-380 DEG C
2-4 hours, after cooling to obtain the final product.
In conclusion advantages of the present invention and good effect are as follows:
The present invention is added suitable nickel, copper, becomes matrix by adjusting the raw material proportioning of high-chromium cast iron alloy blank
Austenite, Lai Tigao corrosion resistance and impact resistance.And it is quenched with sulphur powder before pouring, cooperate heat treatment process, can be avoided
More carbide is precipitated in austenite, condenses fine microstructures, there is preferable mechanical property, keep matrix and graphite big
Small, shape and distribution are improved, and then reduce primary battery quantity and electromotive force, significantly improve corrosion resisting property, improve chromium casting
Then the hardness of ferroalloy blank is modified high-chromium cast iron alloy part surface using intermixture, the mobility of chromium and manganese
Enhance, the element in cladding layer is uniformly distributed, and the residual stress in cladding layer becomes smaller, and is guaranteeing high-chromium alloy cast-iron high rigidity
Meanwhile the absorption impact resistance of high-chromium alloy cast-iron is improved, and then improve its wearability.
The present invention is atomized mixing powder-molding base-alternating temperature sintering-heat treatment cooling-intermixture processing, is obtaining pattern
Simply, after small size, the carbide being evenly distributed, while so that rich chromium cast iron impact flexibility is improved, the bending resistance of alloy
Intensity is also greatly improved, and further improves high-chromium cast iron alloy impact-resistant abrasion-proof performance.
Two-step sintering temperature of the present invention is more than 1200 degrees Celsius, and higher than the temperature of general cast iron, guarantee reaches high chromium casting
The fusing point of ferroalloy ensure that its stability；Simultaneously twice use different sintering temperatures, strengthen its stability, more added with
Conducive to play high-chromium cast iron alloy in potential.
The present invention uses heat treatment different twice, and heat treatment is warming up to 750-780 DEG C for the first time, keeps the temperature 1-2 hours, complete
It is warming up to 980-1020 DEG C after, keeps the temperature 30-40 minutes, is cooled to 920-930 DEG C, keeps the temperature 1-2 hours, is cooled to room temperature；The
Secondary heat treatment is 650-680 DEG C in temperature, keeps the temperature 3-4 hours, water cooling to room temperature is then heated to 520-540 DEG C, air-cooled
To room temperature, the intensity, hardness and wearability of high-chromium cast iron alloy can be improved.
Detailed description of the invention
Fig. 1 is anti-corrosive properties provided in an embodiment of the present invention, the preparation method flow chart of wearability high-chromium cast iron alloy.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Application principle of the invention is described in detail with reference to the accompanying drawing.
As shown in Figure 1, the preparation method of anti-corrosive properties provided in an embodiment of the present invention, wearability high-chromium cast iron alloy is specifically wrapped
It includes:
S101, by a certain percentage by carbon, silicon, chromium, manganese, vanadium, phosphorus, nickel, molybdenum, nitrogen, zinc, copper, iron and inevitable impurity
Carry out mixing, abundant melting mixing；
S102, after in furnace 60~80% it is load melting after, be added and be equivalent to the sulphur powder of its weight 0.01-0.03%,
Pre-alloyed powder is made in water atomization；
Forming agent is added into gained pre-alloyed powder, high-chromium cast iron alloy blank is obtained after compacting by S103；
S104, by gained green compact carry out alternating temperature sintering, upper limit sintering temperature be 1250~1280 DEG C, soaking time be 10~
30min is cooled to rapidly 1220~1245 DEG C of lower limit sintering temperature again later, and soaking time is 30~90min, obtains sintering sample
Base；
Gained sintering sample blanks is air-cooled to room temperature, after sand paper polishing, polishing by S105 in electric furnace after being heat-treated twice
Drying, obtains workpiece；
Gained workpiece is placed in 75-85 DEG C of drying box by S106, after heat preservation 6-8 hours, is coated in work piece surface
Then intermixture, intermixture carry out high-frequency induction cladding with a thickness of 400-600 μm in vacuum heating apparatus；
Treated high-chromium cast iron alloy part is put into electric furnace by S107, under conditions of temperature is 340-380 DEG C
Heat preservation 2-4 hours, after cooling to obtain the final product.
In step S101, raw material proportioning provided in an embodiment of the present invention specifically:
Carbon 0.8-1.2%, silicon 0.6-0.8%, chromium 18-22%, manganese 2.2-3.2%, vanadium 0.2-0.6%, phosphorus 0.01-
0.03%, nickel 0.4-0.8%, molybdenum 0.2-0.5%, nitrogen 0.2-0.4%, zinc 0.06-0.08%, surplus are copper, iron and can not keep away
The impurity exempted from.
In step S105, heat treatment twice provided in an embodiment of the present invention is specifically included:
It is heat-treated for the first time, is warming up to 750-780 DEG C, keep the temperature 1-2 hours, be warming up to 980-1020 DEG C after the completion, heat preservation
30-40 minutes, it is cooled to 920-930 DEG C, 1-2 hours is kept the temperature, is cooled to room temperature；Second of heat treatment is 650-680 in temperature
DEG C, 3-4 hours are kept the temperature, water cooling to room temperature is then heated to 520-540 DEG C, is air-cooled to room temperature.
In step S106, intermixture provided in an embodiment of the present invention is according to mass fraction by 22-26 parts of nickel 60,1-3 parts of carbon
Change boron powder, 4-6 parts of tungsten-carbide powders, 1-2 parts of lead powder ends and 10 parts of binder compositions.
In step S106, high-frequency induction cladding provided in an embodiment of the present invention is specifically included:
Vacuum degree be 55-75Pa under conditions of, start high-frequency induction cladding equipment, within the 50-60s time by electric current from
300-360A is increased to 880-900A, keeps the temperature 60-80s, and closing high-frequency induction is set after electric current is down to 500-520A in 40s
It is standby, it is cooled to room temperature.
In step S103, forming agent provided in an embodiment of the present invention is butadiene-styrene rubber (SG), and the additive amount of forming agent is 0.8
~1.5wt%.
In step S103, pressing mode provided in an embodiment of the present invention be unidirectional steel mold pressing, pressing pressure be 200~
300MPa, dwell time 60s.
Application principle of the invention is described further combined with specific embodiments below.
Embodiment 1:
The first step, by 0.8% carbon, 0.6% silicon, 18% chromium, 2.2% manganese, 0.2% vanadium, 0.01% phosphorus,
0.4% nickel, 0.2% molybdenum, 0.2% nitrogen, 0.06% zinc, 14% copper, 63% iron and 0.33% waste and old electrode
Block and the abundant melting mixing of steel scrap；
Second step, after in furnace 80% it is load melting after, be added and be equivalent to the sulphur powder of its weight 0.01%, water atomization system
Obtain pre-alloyed powder；
The butadiene-styrene rubber (SG) of 0.8wt% is added into gained pre-alloyed powder for third step, using unidirectional steel mold pressing,
Pressure is 200MPa, and the dwell time is that 60s obtains high-chromium cast iron alloy blank；
Gained green compact is carried out alternating temperature sintering by the 4th step, and upper limit sintering temperature is 1250 DEG C, soaking time 10min, it
It is cooled to 1220 DEG C of lower limit sintering temperature, soaking time 30min rapidly again afterwards, obtains sintering sample blanks；
Gained sintering sample blanks is air-cooled to room temperature by the 5th step in electric furnace after being heat-treated twice, with sand paper polishing, polishing
After dry, obtain workpiece；It is heat-treated for the first time, is warming up to 750 DEG C, keep the temperature 1.5 hours, be warming up to 980 DEG C after the completion, heat preservation
30 minutes, 920 DEG C are cooled to, 1 hour is kept the temperature, is cooled to room temperature；Second of heat treatment is 650 DEG C in temperature, keeps the temperature 3 hours,
Water cooling is then heated to 520 DEG C, is air-cooled to room temperature to room temperature；
Gained workpiece is placed in 75 DEG C of drying box by the 6th step, heat preservation 6 hours after, work piece surface coating by
22 parts of nickel, 60,1 parts of boron carbide powders, 4 parts of tungsten-carbide powders, 1 part of lead powder end and 10 parts of binders form intermixture, and intermixture is thick
Degree be 400 μm, then vacuum degree be 55Pa under conditions of, start high-frequency induction cladding equipment, within the 50s time by electric current from
300A is increased to 880A, keeps the temperature 60s, closes high-frequency induction equipment after electric current is down to 500A in 40s, is cooled to room temperature；
Treated high-chromium cast iron alloy part is put into electric furnace by the 7th step, is protected under conditions of temperature is 340 DEG C
Temperature 2 hours, after cooling to obtain the final product.
Embodiment 2
The first step, by 1.2% carbon, 0.8% silicon, 22% chromium, 3.2% manganese, 0.6% vanadium, 0.03% phosphorus,
0.8% nickel, 0.5% molybdenum, 0.4% nitrogen, 0.08% zinc, 10% copper, 60% iron and 0.39% waste and old electrode
Block and the abundant melting mixing of steel scrap；
Second step, after in furnace 60% it is load melting after, be added and be equivalent to the sulphur powder of its weight 0.03%, water atomization system
Obtain pre-alloyed powder；
The butadiene-styrene rubber (SG) of 1.5wt% is added into gained pre-alloyed powder for third step, using unidirectional steel mold pressing,
Pressure is 300MPa, and the dwell time is that 60s obtains high-chromium cast iron alloy blank；
Gained green compact is carried out alternating temperature sintering by the 4th step, and upper limit sintering temperature is 1280 DEG C, soaking time 30min, it
It is cooled to 1245 DEG C of lower limit sintering temperature, soaking time 90min rapidly again afterwards, obtains sintering sample blanks；
Gained sintering sample blanks is air-cooled to room temperature by the 5th step in electric furnace after being heat-treated twice, with sand paper polishing, polishing
After dry, obtain workpiece；It is heat-treated for the first time, is warming up to 780 DEG C, keep the temperature 2 hours, be warming up to 1020 DEG C after the completion, heat preservation
40 minutes, 930 DEG C are cooled to, 2 hours is kept the temperature, is cooled to room temperature；Second of heat treatment is 680 DEG C in temperature, keeps the temperature 4 hours,
Water cooling is then heated to 540 DEG C, is air-cooled to room temperature to room temperature；
Gained workpiece is placed in 85 DEG C of drying box by the 6th step, heat preservation 8 hours after, work piece surface coating by
26 parts of nickel, 60,3 parts of boron carbide powders, 6 parts of tungsten-carbide powders, 2 parts of lead powder ends and 10 parts of binders form intermixture, and intermixture is thick
Degree be 600 μm, then vacuum degree be 75Pa under conditions of, start high-frequency induction cladding equipment, within the 60s time by electric current from
360A is increased to 900A, keeps the temperature 80s, closes high-frequency induction equipment after electric current is down to 520A in 40s, is cooled to room temperature；
Treated high-chromium cast iron alloy part is put into electric furnace by the 7th step, is protected under conditions of temperature is 380 DEG C
Temperature 4 hours, after cooling to obtain the final product.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. the preparation method of a kind of anti-corrosive properties, wearability high-chromium cast iron alloy, which is characterized in that the anti-corrosive properties, wearability are high
The preparation method of chrome cast iron alloy includes:
Step 1, raw material preparation；
Step 2 is atomized mixing powder；
Step 3 is molded base；
Step 4, alternating temperature sintering；
Step 5, heat treatment cooling；
Step 6, intermixture processing；
Step 7, finished product.
2. the preparation method of anti-corrosive properties as described in claim 1, wearability high-chromium cast iron alloy, which is characterized in that the step
One raw material preparation specifically includes:
High-chromium cast iron alloy by element proportion include, carbon 0.8-1.2%, silicon 0.6-0.8%, chromium 18-22%, manganese 2.2-3.2%,
Vanadium 0.2-0.6%, phosphorus 0.01-0.03%, nickel 0.4-0.8%, molybdenum 0.2-0.5%, nitrogen 0.2-0.4%, zinc 0.06-0.08%,
Surplus is copper, iron and inevitable impurity.
3. the preparation method of anti-corrosive properties as described in claim 1, wearability high-chromium cast iron alloy, which is characterized in that the step
Two atomization mixing powder specifically includes:
Carry out mixing by the rich chromium cast iron of design, abundant melting mixing, after in furnace 60~80% it is load melting after, be added suitable
In the sulphur powder of its weight 0.01-0.03%, pre-alloyed powder is made in water atomization.
4. the preparation method of anti-corrosive properties as described in claim 1, wearability high-chromium cast iron alloy, which is characterized in that the step
Three molding base specifically includes:
Forming agent is added into gained pre-alloyed powder, high-chromium cast iron alloy blank is obtained after compacting.
5. the preparation method of anti-corrosive properties as described in claim 1, wearability high-chromium cast iron alloy, which is characterized in that the step
Four alternating temperature sintering specifically includes:
Gained green compact is subjected to alternating temperature sintering, upper limit sintering temperature is 1250~1280 DEG C, and soaking time is 10~30min, it
It is cooled to 1220~1245 DEG C of lower limit sintering temperature rapidly again afterwards, soaking time is 30~90min, obtains sintering sample blanks.
6. the preparation method of anti-corrosive properties as described in claim 1, wearability high-chromium cast iron alloy, which is characterized in that the step
Five heat treatment cooling specifically includes:
Gained sintering sample blanks is air-cooled to room temperature in electric furnace after being heat-treated twice, with being dried after sand paper polishing, polishing, is obtained
Workpiece.
7. the preparation method of anti-corrosive properties as claimed in claim 6, wearability high-chromium cast iron alloy, which is characterized in that it is described twice
Heat treatment content includes: to be heat-treated for the first time, is warming up to 750-780 DEG C, keeps the temperature 1-2 hours, be warming up to 980-1020 after the completion
DEG C, 30-40 minutes are kept the temperature, is cooled to 920-930 DEG C, 1-2 hours is kept the temperature, is cooled to room temperature；It is heat-treated for the second time, is in temperature
650-680 DEG C, 3-4 hours are kept the temperature, water cooling to room temperature is then heated to 520-540 DEG C, is air-cooled to room temperature.
8. the preparation method of anti-corrosive properties as described in claim 1, wearability high-chromium cast iron alloy, which is characterized in that the step
Six intermixture processing specifically includes:
Gained workpiece is placed in 75-85 DEG C of drying box, after heat preservation 6-8 hours, in work piece surface coating mixt, is mixed
Then mixture carries out high-frequency induction cladding, particular content are as follows: in vacuum degree with a thickness of 400-600 μm in vacuum heating apparatus
Under conditions of 55-75Pa, starts high-frequency induction cladding equipment, be increased to electric current from 300-360A within the 50-60s time
880-900A keeps the temperature 60-80s, closes high-frequency induction equipment after electric current is down to 500-520A in 40s, is cooled to room temperature i.e.
It can；
Wherein, the intermixture includes the raw material of following parts by weight: 22-26 parts of nickel 60,1-3 parts of boron carbide powders, 4-6 parts of carbonizations
Tungsten powder, 1-2 parts of lead powder ends, 10 parts of binders.
9. the preparation method of anti-corrosive properties as described in claim 1, wearability high-chromium cast iron alloy, which is characterized in that the step
Seven finished product specifically includes:
Treated high-chromium cast iron alloy part is put into electric furnace, heat preservation 2-4 is small under conditions of temperature is 340-380 DEG C
When, after cooling to obtain the final product.
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| CN110732654A (en) * | 2019-09-12 | 2020-01-31 | 天津立鑫晟智能制造有限公司 | Liquid die forging process for high-chromium cast iron plate hammers |
| CN112338171A (en) * | 2020-11-04 | 2021-02-09 | 湖北恩腾机械有限公司 | Preparation process of metal wear-resistant alloy flange |
| CN112985052A (en) * | 2021-04-09 | 2021-06-18 | 江西科技学院 | Tunnel type continuous sintering furnace and sintering method thereof |
| CN113357269A (en) * | 2021-07-05 | 2021-09-07 | 太原科技大学 | Method for manufacturing outer ring of rolling bearing |
| CN113564495A (en) * | 2021-07-14 | 2021-10-29 | 四川省柏均机械制造有限责任公司 | High-chromium cast iron and liquid cooling method for high-chromium cast iron |
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Application publication date: 20190723 |