CN101597715A - Iron-based high-temperature alloy material for guide roller and preparation method thereof - Google Patents
Iron-based high-temperature alloy material for guide roller and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of iron-based high-temperature alloy material for guide roller and preparation method thereof.Represent with weight percentage, the chemical constitution of iron-based high-temperature alloy material for guide roller is: C 1.0～1.5%, Mn 0.3～0.8%, and Si 0.4～1.0%, and Cr 18～24%, V 0.25～0.5%, Mo 1.5～4.5%, rare earth 0.01～0.05%, S≤0.04%, P≤0.04%, surplus are Fe.The present invention is raw material with the iron-based high-temperature alloy material, adopts the silicon sol investment precision casting technology to be processed into thick finished product deflector roll, and annealed successively then, roughing, quenching, tempering and precision work obtain the finished product deflector roll.The deflector roll cost that adopts the technology of the present invention to prepare is low, be greatly improved, and have good high temperature oxidation resistance, hot strength, shock resistance high temperature toughness and high temperature resistance frictional wear work-ing life.
Description
One, technical field:
The present invention relates to a kind of alloy material and treatment process thereof, particularly relate to a kind of iron-based high-temperature alloy material for guide roller and preparation method thereof.
Two, background technology:
Deflector roll is the vitals of milling train, is used for carrying section bar and wire rod to make it enter milling train smoothly.Along with the raising of mill milling speed, sliding guide (deflector roll) is replaced by rolling guide gradually.Because the complexity of Working environment, deflector roll is short work-ing life, and deflector roll has become the main consumable part on the high-speed rod-rolling mill.At present, the deflector roll material that adopts usually has three kinds both at home and abroad, and first kind is the high temperature steel with austenite structure; Second kind is wear resisting steel or the antifriction cast iron with martensitic stucture; The third is a Wimet.Austenitic heat-resistance steel has good high-temperature stability and toughness, but wear no resistance, quick abrasion; And the mutual adhesion proneness of austenite and wire rod (being organized as ferrite or austenite) itself is bigger, and steel bonding easily takes place.Martensitic stucture wear resisting steel and antifriction cast iron at room temperature have good wear resistance, but along with the raising of use temperature, martensite generation tempering, wear resistance can reduce.The Wimet deflector roll has good wear resistance and high-temperature stability, but the impelling strength of this deflector roll is relatively poor.
One of key of guide and guards design is the selection of high-temperature anti-abrasion material, and traditional deflector roll material can not satisfy the high performance requirements of present deflector roll, and developing novel deflector roll material is the problem that presses for solution at present.
Nickel base superalloy is along with air system grows up to the requirement that high-temperature material improves constantly, and mainly is used in high temperature parts such as blade material.The Working environment of blade is also very abominable, and high temperature blade not only is subjected to high temperature action, and is subjected to the effect of sound load, thermal fatigue, high-frequency vibration, low cycle fatigue, oxidation and high temperature corrosion.So require material to have very high high temperature tensile strength, creep rupture strength performance and good creep resisting ability.According to the application of nickel base superalloy in air system, in conjunction with the Working environment of deflector roll and the performance requriements of each side thereof, nickel-base high-temperature alloy material and the thermal treatment process thereof that a kind of deflector roll is used developed in Tsing-Hua University's invention, adopt the deflector roll of nickel-base high-temperature alloy material preparation, though have good high temperature oxidation resistance, thermal shock resistance and hot strength, increase with respect to traditional deflector roll material its work-ing life, but cost is higher.
In order to reduce the production cost of deflector roll, the deflector roll life-span of production is improved, and have good high temperature oxidation resistance, hot strength, shock resistance high temperature toughness and high temperature resistance frictional wear.Zhengzhou Shenniu Steel Casting Factory develops novel high-temperature alloy material and thermal treatment process thereof that a kind of deflector roll is used through long term studies.
Three, summary of the invention:
The technical problem to be solved in the present invention provides a kind of iron-based high-temperature alloy material for guide roller and preparation method thereof.The deflector roll cost that adopts this invention technology to prepare is low, be greatly improved, and have good high temperature oxidation resistance, hot strength, shock resistance high temperature toughness and high temperature resistance frictional wear work-ing life.
The technical solution used in the present invention is:
The invention provides a kind of iron-based high-temperature alloy material for guide roller, represent that with weight percentage the chemical constitution of described iron-based high-temperature alloy material for guide roller is: C 1.0～1.5%, and Mn 0.3～0.8%, Si 0.4～1.0%, Cr 18～24%, and V 0.25～0.5%, and Mo 1.5～4.5%, rare earth 0.01～0.05%, S≤0.04%, P≤0.04%, surplus is Fe.
A kind of method of utilizing iron-based high-temperature alloy material for guide roller to prepare deflector roll, this method may further comprise the steps:
A, precision casting: according to the chemical constitution preparation iron-based high-temperature alloy material of the described iron-based high-temperature alloy material for guide roller of claim 1, adopt the silicon sol investment precision casting technology to be processed into deflector roll, at first use low temperature cerul mould material to make the deflector roll model in the precision casting process, adopt silicasol case technology to make the model shell, in the silicasol case technological process, smearing the silicon sol number of plies on the deflector roll model is 6～8 layers, obtain deflector roll model shell after the steam dewaxing, roasting shell then, maturing temperature is 950～1050 ℃, soaking time is 30～45 minutes, after roasting finishes be that molten steel is poured in the model shell and poured into a mould with the iron-based high-temperature alloy material of preparation, the pouring molten steel temperature is 1580～1620 ℃, model shell temperature is 600～800 ℃, the deflector roll that after the cast precision casting is become naturally cools to room temperature, removes gating system then, obtains deflector roll;
B, annealing: the deflector roll that step a is processed into is warming up to 860 ℃ of insulations 110～130 minutes by room temperature, cools the temperature to 690 ℃ of insulations 80～100 minutes then, reduces to 600 ℃ again and comes out of the stove, and naturally cools to room temperature after coming out of the stove;
C, roughing: adopt conventional cutter that deflector roll is carried out turning processing;
D, quenching: the deflector roll after the turning processing is warming up to 1060 ℃ of insulations 40～60 minutes by room temperature, comes out of the stove then with oil, be cooled to room temperature as heat-eliminating medium;
E, tempering: will be warming up to 200 ℃ of insulations 110～130 minutes by room temperature through the deflector roll of quench treatment, coming out of the stove then naturally cools to room temperature;
F, precision work: will be finish-machined to the finished product deflector roll with inserted tool through the deflector roll after quenching, the temper.
According to the above-mentioned method of utilizing iron-based high-temperature alloy material for guide roller to prepare deflector roll, wherein the various chemical ingredientss that the composition of various chemical ingredientss meets in the above-mentioned iron-based high-temperature alloy material for guide roller in the deflector roll that precision casting process is processed among the step a are formed.
According to the above-mentioned method of utilizing iron-based high-temperature alloy material for guide roller to prepare deflector roll, wherein the described roasting shell of step a is to adopt diesel oil stove to carry out roasting.
According to the above-mentioned method of utilizing iron-based high-temperature alloy material for guide roller to prepare deflector roll, wherein being warming up to 860 ℃ by room temperature in the step b annealing process is to heat up according to 100～150 ℃ the speed of per hour heating up; Reduce to 690 ℃ and to reduce to 600 ℃ by 690 ℃ be to lower the temperature according to 90～110 ℃ the speed of per hour lowering the temperature by 860 ℃.
According to the above-mentioned method of utilizing iron-based high-temperature alloy material for guide roller to prepare deflector roll, wherein being warming up to 1060 ℃ by room temperature in the steps d quenching process is to heat up according to 100～150 ℃ the speed of per hour heating up.
According to the above-mentioned method of utilizing iron-based high-temperature alloy material for guide roller to prepare deflector roll, wherein being warming up to 200 ℃ by room temperature in the step e drawing process is to heat up according to 100～120 ℃ the speed of per hour heating up.
According to the above-mentioned method of utilizing iron-based high-temperature alloy material for guide roller to prepare deflector roll, wherein the deflector roll hardness HRC after the tempered processing of step e is 55～60.
Positive beneficial effect of the present invention:
1, material design of the present invention is to dominate the principle that alloying element combines with auxiliary element, and the resource of basing on our country has successfully been developed a kind of no nickel type martensite heat-resistance and wear-resistance steel, promptly develops the iron-based high-temperature alloy material that a kind of deflector roll is used.The present invention obtains to have the iron-based high-temperature alloy material of premium properties with lower cost, can the import substitution deflector roll, have the good social economic benefit.
2, every index of the deflector roll of the present invention's preparation can satisfy every performance demands (seeing table one for details) such as deflector roll is high temperature resistant, wear-resisting, heat shock resistance, thermal fatigue fully.
3, the deflector roll cost that adopts iron-based high-temperature alloy material of the present invention to make is low, and prove through the user: its work-ing life is than improving more than 4 times the work-ing life of original deflector roll.
4, product deflector roll of the present invention at high temperature has good antioxidant property, and promptly anti-oxidant under 850～950 ℃, roll surface is not peeled, nondiscoloration; Have enough hot strengths, higher high temperature creep-resisting breakdown point and creep rupture strength are arranged, under 950 ℃～200 ℃ temperature cycle, do not produce heat fatigue cracking; In condition of high temperature undertissue temperature, enough hardness is arranged, thereby have good high temperature resistance frictional wear (seeing table two and table three for details); Has good shock resistance high temperature toughness (seeing table one for details).
The mechanicl test report of table one deflector roll of the present invention
| Specimen coding | Tensile strength (σ b) N/mm 2 | Impact value (A kn) J | Impelling strength (a kn) J/m 2 |
| 1 | 1460 | / | / |
| 2 | 12.5 | 16.3 | |
| 3 | 8.0 | 10.7 | |
| 4 | 11.0 | 14.3 |
Table two product deflector roll of the present invention antioxidant property trial report
The mechanicl test report of table three deflector roll of the present invention
| Specimen coding | Hardness (HRC) | Remarks |
| 4-1 | 55.556.057.0 | ZG10Cr20Mo3VRe |
| 4-2 | 56.556.557.0 | ZG10Cr20Mo3VRe |
Detection data in table one, the table three are mechanicl test reports of having been done by Zhengzhou Machinery Research Institute under Ministry of Machine Building.
Four, embodiment:
Following examples only in order to further specify the present invention, do not limit content of the present invention.
Embodiment 1
The chemical constitution of iron-based high-temperature alloy material for guide roller of the present invention:
C 1.0%, and Mn 0.4%, and Si 0.5%, and Cr 18%, and V 0.25%, and Mo 2%, rare earth 0.02%, and S 0.03%, and P 0.02%, and surplus is Fe.
Utilize iron-based high-temperature alloy material to prepare the method for deflector roll, its detailed step is as follows:
A, precision casting: according to the chemical constitution preparation iron-based high-temperature alloy material of above-mentioned iron-based high-temperature alloy material for guide roller, adopt the silicon sol investment precision casting technology to be processed into deflector roll, at first use low temperature cerul mould material to make the deflector roll model in the precision casting process, adopt silicasol case technology to make the model shell, in the silicasol case technological process, smearing the silicon sol number of plies on the deflector roll model is 6～8 layers, obtain deflector roll model shell after the steam dewaxing, adopt diesel oil stove roasting shell then, maturing temperature is 1000 ℃, soaking time is 35 minutes, after roasting finishes be that molten steel is poured in the model shell and poured into a mould with the iron-based high-temperature alloy material of preparation, the pouring molten steel temperature is 1600 ℃, model shell temperature is 600～800 ℃, the deflector roll that after the cast precision casting is become naturally cools to room temperature, remove gating system then, obtain deflector roll, the various chemical ingredientss that the composition of various chemical ingredientss meets in the above-mentioned iron-based high-temperature alloy material for guide roller in the deflector roll that precision casting process is processed into are formed;
B, annealing: the deflector roll that step a is processed into is warming up to 860 ℃ of insulations 120 minutes by room temperature, cools the temperature to 690 ℃ of insulations 90 minutes then, reduces to 600 ℃ again and comes out of the stove, and naturally cools to room temperature after coming out of the stove; Being warming up to 860 ℃ by room temperature in the annealing process is to heat up according to 100～150 ℃ the speed of per hour heating up, and reduces to 690 ℃ and to reduce to 600 ℃ by 690 ℃ be to lower the temperature according to 90～110 ℃ the speed of per hour lowering the temperature by 860 ℃;
C, roughing: adopt conventional cutter that deflector roll is carried out turning processing;
D, quenching: the deflector roll after the turning processing is warming up to 1060 ℃ of insulations 50 minutes by room temperature, comes out of the stove then with oil, be cooled to room temperature as heat-eliminating medium; Being warming up to 1060 ℃ by room temperature in the quenching process is to heat up according to 100～150 ℃ the speed of per hour heating up;
E, tempering: will be warming up to 200 ℃ of insulations 120 minutes by room temperature through the deflector roll of quench treatment, coming out of the stove then naturally cools to room temperature, and the deflector roll hardness HRC after the tempered processing is 55～60; Being warming up to 200 ℃ by room temperature in the drawing process is to heat up according to 100～120 ℃ the speed of per hour heating up;
F, precision work: will be finish-machined to the finished product deflector roll with inserted tool through the deflector roll after quenching, the temper.
Embodiment 2: basic identical with embodiment one, difference is:
C 1.1%, and Mn 0.3%, and Si 0.4%, and Cr 20%, and V 0.3%, and Mo 1.5%, rare earth 0.01%, and S 0.04%, and P 0.03%, and surplus is Fe.
Utilize iron-based high-temperature alloy material to prepare the method for deflector roll, be with embodiment one difference:
A, precision casting: maturing temperature is 1050 ℃, and soaking time is 30 minutes, and the pouring molten steel temperature is 1580 ℃, and model shell temperature is 800 ℃;
B, annealing: deflector roll is warming up to 860 ℃ of insulations 110 minutes by room temperature, cools the temperature to 690 ℃ of insulations 100 minutes then; Being warming up to 860 ℃ by room temperature in the annealing process is to heat up according to 120 ℃ the speed of per hour heating up, and reduces to 690 ℃ and to reduce to 600 ℃ by 690 ℃ be to lower the temperature according to 100 ℃ the speed of per hour lowering the temperature by 860 ℃;
D, quenching: the deflector roll after the turning processing is warming up to 1060 ℃ of insulations 60 minutes by room temperature; Being warming up to 1060 ℃ by room temperature in the quenching process is to heat up according to 150 ℃ the speed of per hour heating up;
E, tempering: will be warming up to 200 ℃ of insulations 130 minutes by room temperature through the deflector roll of quench treatment; Being warming up to 200 ℃ by room temperature in the drawing process is to heat up according to 110 ℃ the speed of per hour heating up.
Embodiment 3: basic identical with embodiment one, difference is:
C 1.2%, and Mn 0.5%, and Si 0.6%, and Cr 19%, and V 0.35%, and Mo 3%, rare earth 0.04%, and S 0.01%, and P 0.04%, and surplus is Fe.
Utilize iron-based high-temperature alloy material to prepare the method for deflector roll, be with embodiment one difference:
A, precision casting: maturing temperature is 950 ℃, and soaking time is 45 minutes, and the pouring molten steel temperature is 1620 ℃, and model shell temperature is 700 ℃;
B, annealing: deflector roll is warming up to 860 ℃ of insulations 130 minutes by room temperature, cools the temperature to 690 ℃ of insulations 80 minutes then; Being warming up to 860 ℃ by room temperature in the annealing process is to heat up according to 150 ℃ the speed of per hour heating up, and reduces to 690 ℃ and to reduce to 600 ℃ by 690 ℃ be to lower the temperature according to 90 ℃ the speed of per hour lowering the temperature by 860 ℃;
D, quenching: the deflector roll after the turning processing is warming up to 1060 ℃ of insulations 40 minutes by room temperature; Being warming up to 1060 ℃ by room temperature in the quenching process is to heat up according to 130 ℃ the speed of per hour heating up;
E, tempering: will be warming up to 200 ℃ of insulations 110 minutes by room temperature through the deflector roll of quench treatment; Being warming up to 200 ℃ by room temperature in the drawing process is to heat up according to 120 ℃ the speed of per hour heating up.
Embodiment 4: basic identical with embodiment one, difference is:
C 1.3%, and Mn 0.6%, and Si 0.8%, and Cr 21%, and V 0.4%, and Mo 3.5%, rare earth 0.05%, and S 0.01%, and P 0.025%, and surplus is Fe.
Utilize iron-based high-temperature alloy material to prepare the method for deflector roll, be with embodiment one difference:
A, precision casting: maturing temperature is 1020 ℃, and soaking time is 40 minutes, and the pouring molten steel temperature is 1600 ℃, and model shell temperature is 600 ℃;
B, annealing: deflector roll is warming up to 860 ℃ of insulations 120 minutes by room temperature, cools the temperature to 690 ℃ of insulations 90 minutes then; Being warming up to 860 ℃ by room temperature in the annealing process is to heat up according to 100 ℃ the speed of per hour heating up, and reduces to 690 ℃ and to reduce to 600 ℃ by 690 ℃ be to lower the temperature according to 110 ℃ the speed of per hour lowering the temperature by 860 ℃;
D, quenching: the deflector roll after the turning processing is warming up to 1060 ℃ of insulations 50 minutes by room temperature; Being warming up to 1060 ℃ by room temperature in the quenching process is to heat up according to 100 ℃ the speed of per hour heating up;
E, tempering: will be warming up to 200 ℃ of insulations 120 minutes by room temperature through the deflector roll of quench treatment; Being warming up to 200 ℃ by room temperature in the drawing process is to heat up according to 100 ℃ the speed of per hour heating up.
Embodiment 5: basic identical with embodiment one, difference is:
C 1.4%, and Mn 0.8%, and Si 1.0%, and Cr 23%, and V 0.5%, and Mo 4%, rare earth 0.03%, and S 0.02%, and P 0.03%, and surplus is Fe.
Utilize iron-based high-temperature alloy material to prepare the method for deflector roll with embodiment one.
Embodiment 6: basic identical with embodiment one, difference is:
C 1.5%, and Mn 0.4%, and Si 0.7%, and Cr 24%, and V 0.45%, and Mo 4.5%, rare earth 0.035%, and S 0.01%, and P 0.025%, and surplus is Fe.
Utilize iron-based high-temperature alloy material to prepare the method for deflector roll with embodiment one.
Embodiment 7: basic identical with embodiment one, difference is:
C 1.0%, and Mn 0.3%, and Si 0.4%, and Cr 18%, and V 0.25%, and Mo 1.5%, rare earth 0.01%, and S0.01%, P 0.01%, and surplus is Fe.
Utilize iron-based high-temperature alloy material to prepare the method for deflector roll with embodiment one.
Embodiment 8: basic identical with embodiment one, difference is:
C 1.5%, and Mn 0.8%, and Si 1.0%, and Cr 24%, and V 0.5%, and Mo 4.5%, rare earth 0.05%, and S 0.04%, and P 0.04%, and surplus is Fe.
Utilize iron-based high-temperature alloy material to prepare the method for deflector roll with embodiment one.
Claims (8)
1, a kind of iron-based high-temperature alloy material for guide roller is characterized in that, represents with weight percentage, the chemical constitution of described iron-based high-temperature alloy material for guide roller is: C 1.0～1.5%, Mn 0.3～0.8%, and Si 0.4～1.0%, and Cr 18～24%, V 0.25～0.5%, Mo 1.5～4.5%, rare earth 0.01～0.05%, S≤0.04%, P≤0.04%, surplus are Fe.
2, a kind of method of utilizing the described iron-based high-temperature alloy material for guide roller of claim 1 to prepare deflector roll is characterized in that, said method comprising the steps of:
A, precision casting: according to the chemical constitution preparation iron-based high-temperature alloy material of the described iron-based high-temperature alloy material for guide roller of claim 1, adopt the silicon sol investment precision casting technology to be processed into deflector roll, at first use low temperature cerul mould material to make the deflector roll model in the precision casting process, adopt silicasol case technology to make the model shell, in the silicasol case technological process, smearing the silicon sol number of plies on the deflector roll model is 6～8 layers, obtain deflector roll model shell after the steam dewaxing, roasting shell then, maturing temperature is 950～1050 ℃, soaking time is 30～45 minutes, after roasting finishes be that molten steel is poured in the model shell and poured into a mould with the iron-based high-temperature alloy material of preparation, the pouring molten steel temperature is 1580～1620 ℃, model shell temperature is 600～800 ℃, the deflector roll that after the cast precision casting is become naturally cools to room temperature, removes gating system then, obtains deflector roll;
B, annealing: the deflector roll that step a is processed into is warming up to 860 ℃ of insulations 110～130 minutes by room temperature, cools the temperature to 690 ℃ of insulations 80～100 minutes then, reduces to 600 ℃ again and comes out of the stove, and naturally cools to room temperature after coming out of the stove;
C, roughing: adopt conventional cutter that deflector roll is carried out turning processing;
D, quenching: the deflector roll after the turning processing is warming up to 1060 ℃ of insulations 40～60 minutes by room temperature, comes out of the stove then with oil, be cooled to room temperature as heat-eliminating medium;
E, tempering: will be warming up to 200 ℃ of insulations 110～130 minutes by room temperature through the deflector roll of quench treatment, coming out of the stove then naturally cools to room temperature;
F, precision work: will be finish-machined to the finished product deflector roll with inserted tool through the deflector roll after quenching, the temper.
3, the method for utilizing the described iron-based high-temperature alloy material for guide roller of claim 1 to prepare deflector roll according to claim 2 is characterized in that: the various chemical ingredientss that the composition of various chemical ingredientss meets in the described iron-based high-temperature alloy material for guide roller of claim 1 in the deflector roll that precision casting process is processed among the step a are formed.
4, the method for utilizing the described iron-based high-temperature alloy material for guide roller of claim 1 to prepare deflector roll according to claim 2 is characterized in that: the described roasting shell of step a is to adopt diesel oil stove to carry out roasting.
5, the method for utilizing the described iron-based high-temperature alloy material for guide roller of claim 1 to prepare deflector roll according to claim 2 is characterized in that: being warming up to 860 ℃ by room temperature in the step b annealing process is to heat up according to 100～150 ℃ the speed of per hour heating up; Reduce to 690 ℃ and to reduce to 600 ℃ by 690 ℃ be to lower the temperature according to 90～110 ℃ the speed of per hour lowering the temperature by 860 ℃.
6, the method for utilizing the described iron-based high-temperature alloy material for guide roller of claim 1 to prepare deflector roll according to claim 2 is characterized in that: being warming up to 1060 ℃ by room temperature in the steps d quenching process is to heat up according to 100～150 ℃ the speed of per hour heating up.
7, the method for utilizing the described iron-based high-temperature alloy material for guide roller of claim 1 to prepare deflector roll according to claim 2 is characterized in that: being warming up to 200 ℃ by room temperature in the step e drawing process is to heat up according to 100～120 ℃ the speed of per hour heating up.
8, the method for utilizing the described iron-based high-temperature alloy material for guide roller of claim 1 to prepare deflector roll according to claim 2 is characterized in that: the deflector roll hardness HRC after the tempered processing of step e is 55～60.
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| CN2009100653717A CN101597715B (en) | 2009-07-03 | 2009-07-03 | Iron-based high-temperature alloy material for guide roller and preparation method thereof |
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| CN2009100653717A CN101597715B (en) | 2009-07-03 | 2009-07-03 | Iron-based high-temperature alloy material for guide roller and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112803A (en) * | 2015-09-18 | 2015-12-02 | 巢湖市南特精密制造有限公司 | Abrasion-resistant alloy material for refrigerator compressor crank shaft and preparation method of abrasion-resistant alloy material |
| CN106132572A (en) * | 2014-01-16 | 2016-11-16 | 达涅利机械设备股份公司 | For rolling the guide of long metallic article |
| CN106435347A (en) * | 2016-10-24 | 2017-02-22 | 马鞍山顺发机械制造有限公司 | Automobile brake foundry technology |
| CN108315665A (en) * | 2017-12-29 | 2018-07-24 | 安徽宝辰机电设备科技有限公司 | A kind of laser-beam welding machine framework material |
-
2009
- 2009-07-03 CN CN2009100653717A patent/CN101597715B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106132572A (en) * | 2014-01-16 | 2016-11-16 | 达涅利机械设备股份公司 | For rolling the guide of long metallic article |
| CN106132572B (en) * | 2014-01-16 | 2018-02-13 | 达涅利机械设备股份公司 | For rolling the guide device of long metallic article |
| CN105112803A (en) * | 2015-09-18 | 2015-12-02 | 巢湖市南特精密制造有限公司 | Abrasion-resistant alloy material for refrigerator compressor crank shaft and preparation method of abrasion-resistant alloy material |
| CN106435347A (en) * | 2016-10-24 | 2017-02-22 | 马鞍山顺发机械制造有限公司 | Automobile brake foundry technology |
| CN108315665A (en) * | 2017-12-29 | 2018-07-24 | 安徽宝辰机电设备科技有限公司 | A kind of laser-beam welding machine framework material |
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|---|---|
| CN101597715B (en) | 2011-02-09 |
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