CN102373359B - Method for producing alloy steel powder special for automobile engines - Google Patents
Method for producing alloy steel powder special for automobile engines Download PDFInfo
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- CN102373359B CN102373359B CN201010258447.0A CN201010258447A CN102373359B CN 102373359 B CN102373359 B CN 102373359B CN 201010258447 A CN201010258447 A CN 201010258447A CN 102373359 B CN102373359 B CN 102373359B
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Abstract
The invention relates to a method for producing alloy steel powder special for automobile engines. The method is characterized in that: the alloy steel powder is formed by mixing high alloy steel powder and water atomized pure iron powder in a segregation-free adhesion mode, and the method comprises the following steps of: 1) preparing the water atomized pure iron powder; 2) preparing the high alloy steel powder; and 3) performing segregation-free adhesion, namely adding the high alloy steel powder and the water atomized pure iron powder into a blender mixer in a ratio, spraying adhesive when the heating temperature reaches 50 to 140 DEG C, mixing for 60 to 100 minutes, extracting volatile substances in vacuum, cooling the volatile substances to the temperature of below 40 DEG C, adding a lubricating agent, mixing uniformly, and packing. Compared with the prior art, the method has the advantages that: 1, the alloy steel powder has relatively high compressibility; 2, the alloy elements can be completely alloyed in the product sintering process; and 3, the alloy elements are not segregated in the transportation and mixing treatment processes, the stability of dimensional tolerance can be kept in the product sintering process, and the mechanical property of a sintered piece is improved.
Description
Technical field
The invention belongs to field of powder metallurgy, particularly relate to a kind of method adopting high-alloy steel powder and water atomized iron powder to produce alloy steel powder special for automobile engines.
Background technology
Motor car engine alloy powder require there is high strength, high rigidity, high heat resistance, and have once sintered after can reach hard high-strength mechanical property.Current home and abroad production motor car engine alloy powder all adopts the following two kinds mode: 1), alloy molten steel is directly atomized into alloy powder, its shortcoming be oxidizable, compressibility is low, and then affects intensity, the hardness of product.2), with isozygotying bronze and iron powder are mixed into alloy powder, and its shortcoming is that cost is high, degree of segregation is large.
Summary of the invention
The object of this invention is to provide a kind of production method of alloy steel powder special for automobile engines, high-alloy steel powder is mixed by segregation-free bonding mode with water atomized iron powder, reduce degree of segregation, improve the density of product, improve the over-all properties such as product hardness, intensity.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A production method for alloy steel powder special for automobile engines, mixed by segregation-free bonding mode by high-alloy steel powder and water atomized iron powder, its operation steps is described below:
1) prepare water atomized iron powder, comprise smelting, atomization, reduction, its operation steps is as follows:
A, smelting: with steel scrap, the pig iron etc. for main raw material, obtain by the smelting of electric furnace the molten steel that uniform composition is stablized, impurity is few, tapping temperature: 1600 ~ 1800 DEG C, and its main chemical composition is by weight percentage:
C≤0.60％ Si≤0.50％ Mn≤0.50％ P≤0.050％ S≤0.050％；
B, atomization: atomization process is undertaken by water atomizing system, atomizing pressure 60 ~ 160Mpa, through the water atomization hair powder that dehydration, drying obtain after atomization, drying temperature is 110 ~ 300 DEG C, hydrogen loss≤3.0%;
C, reduction: above-mentioned water atomization hair powder is reduced through reduction furnace, reduction furnace reduction preheating section temperature 550 ~ 800 DEG C, high temperature section temperature 800 ~ 1000 DEG C, cooling section temperature 500 ~ 800 DEG C, ammonia flow 60 ~ 190m
3/ h, travelling speed 90 ~ 300mm/min, bed thickness 12 ~ 48mm; Obtain water atomized iron powder;
Water atomized iron powder that d, step c obtain through broken, screening, to close batch, detect and obtain finished product water atomized iron powder;
2) prepare high-alloy steel powder, comprise smelting, atomization, its operation steps is as follows:
A, smelting: with various alloy and iron alloy for main raw material, smelted by high-frequency furnace and obtain the molten steel that uniform composition is stablized, impurity is few, tapping temperature: 1500 ~ 1700 DEG C, its chemical composition is by weight percentage:
Ni:5-12%, Cr:11-19%, Co:26-35%, Mo:15-25%, Si:0.3-1.5%, V:0.5-3.3%, C :≤4.0%, surplus is Fe; Above composition summation is 100%;
B, atomization: atomization process is implemented by aerosolization system, atomizing pressure: 50 ~ 130Mpa, and medium is nitrogen;
C, the high-alloy steel powder obtained are criticized through sieving, closing, detection obtains finished product high-alloy steel powder.
3) segregation-free bonding, add in mixer by above-mentioned finished product high-alloy steel powder and finished product water atomized iron powder by 1: 5, mix and heat, mixture chemical composition is by weight percentage: Ni:1.0-2.4%, Cr:2.2-3.8%, Co:5.2-7.0%, Mo:3.0-5.0%, Si:0.06-0.3%, V:0.1-0.66%, C :≤0.8%, surplus is Fe, and above composition summation is 100%; When temperature reaches 50 ~ 140 DEG C, spray into the polyoxyethylene glycol of mixture weight per-cent 0.001% ~ 1.0%, mix 60 ~ 100 minutes, volatile matter is extracted out to be cooled to less than 40 DEG C by vacuum, the micro mist wax adding mixture weight per-cent 0.5 ~ 1.2% again mixes rear packaging, obtains finished product special metals comminuted steel shot.
Compared with prior art, the invention has the beneficial effects as follows: 1, there is higher compressibility; 2, alloying element can complete alloying further in goods sintering process; 3, in transport and combination treatment process, do not produce alloy element component segregation, tolerance of dimension can be kept in goods sintering process to stablize, the more effective mechanical property improving sintered part.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described further:
A production method for alloy steel powder special for automobile engines, mixed by segregation-free bonding mode by high-alloy steel powder and water atomized iron powder, its operation steps is described below:
1) prepare water atomized iron powder, comprise smelting, atomization, reduction, its operation steps is as follows:
A, smelting: with steel scrap, the pig iron etc. for main raw material, obtain by the smelting of electric furnace the molten steel that uniform composition is stablized, impurity is few, tapping temperature: 1600 ~ 1800 DEG C, and its main chemical composition is by weight percentage:
C≤0.60％ Si≤0.50％ Mn≤0.50％ P≤0.050％ S≤0.050％；
B, atomization: atomization process is undertaken by water atomizing system, atomizing pressure 60 ~ 160Mpa, through the water atomization hair powder that dehydration, drying obtain after atomization, drying temperature is 110 ~ 300 DEG C, hydrogen loss≤3.0%;
C, reduction: above-mentioned water atomization hair powder is reduced through reduction furnace, reduction furnace reduction preheating section temperature 550 ~ 800 DEG C, high temperature section temperature 800 ~ 1000 DEG C, cooling section temperature 500 ~ 800 DEG C, ammonia flow 60 ~ 190m
3/ h, travelling speed 90 ~ 300mm/min, bed thickness 12 ~ 48mm; Obtain water atomized iron powder;
D, the water atomized iron powder that obtains through broken, screening, to close batch, detect and obtain finished product water atomized iron powder.
2) prepare high-alloy steel powder, comprise smelting, atomization, its operation steps is as follows:
A, smelting: with various alloy and iron alloy for main raw material, smelted by high-frequency furnace and obtain the molten steel that uniform composition is stablized, impurity is few, tapping temperature: 1500 ~ 1700 DEG C, its chemical composition is by weight percentage:
Ni:5-12%, Cr:11-19%, Co:26-35%, Mo:15-25%, Si:0.3-1.5%, V:0.5-3.3%, C :≤4.0%, surplus is Fe; Above composition summation is 100%;
B, atomization: atomization process is implemented by aerosolization system, atomizing pressure: 50 ~ 130Mpa, and medium is nitrogen;
C, the high-alloy steel powder obtained are criticized through sieving, closing, detection obtains finished product high-alloy steel powder.
3), segregation-free bonding, add in mixer by above-mentioned high-alloy steel powder and water atomized iron powder by 1: 5, mix and heat, mixture chemical composition is by weight percentage: Ni:1.0-2.4%, Cr:2.2-3.8%, Co:5.2-7.0%, Mo:3.0-5.0%, Si:0.06-0.3%, V:0.1-0.66%, C :≤0.8%, surplus is Fe, and above composition summation is 100%; When temperature reaches 50 ~ 140 DEG C, spray into the binding agent-polyoxyethylene glycol of mixture weight per-cent 0.001% ~ 1.0%, mix 60 ~ 100 minutes, volatile matter is extracted out to be cooled to less than 40 DEG C by vacuum, lubricant-the micro mist wax adding mixture weight per-cent 0.5 ~ 1.2% again mixes rear packaging, obtains finished product special metals comminuted steel shot.
To produce chemical composition by weight percentage for formula is for Ni:1.4%, Cr:3.5%, Co:6%, Mo:19%, Si:0.1%, V:0.2%, C:1.9%, surplus is the special metals comminuted steel shot of Fe is example, and different process process performance parameters compares and sees the following form 1:
1) pure atomized alloy comminuted steel shot
2) water atomized iron powder+high-alloy steel powder
3) water atomized iron powder+isozygoty bronze
Table 1: different process process performance parameters compares
Sintering condition: sintering temperature: 1120 DEG C, soaking time 60min, H
2100%;
By the above-mentioned alloy comparing water atomized iron powder+high-alloy steel powder and be obviously better than alternate manner production in intensity, hardness and size changing rate etc., tolerance of dimension can be kept in goods sintering process to stablize, the more effective mechanical property improving sintered part, meets the requirement of motor car engine high strength, high rigidity, high heat resistance.
Claims (1)
1. a production method for alloy steel powder special for automobile engines, is characterized in that, mixed by segregation-free bonding mode by high-alloy steel powder and water atomized iron powder, its operation steps is described below:
1) prepare water atomized iron powder, comprise smelting, atomization, reduction, its operation steps is as follows:
A, smelting: with steel scrap, the pig iron for main raw material, obtain by the smelting of electric furnace the molten steel that uniform composition is stablized, impurity is few, tapping temperature: 1600 ~ 1800 DEG C, its main chemical composition is by weight percentage:
C≤0.60％ Si≤0.50％ Mn≤0.50％ P≤0.050％ S≤0.050％；
B, atomization: atomization process is undertaken by water atomizing system, atomizing pressure 60 ~ 160Mpa, through the water atomization hair powder that dehydration, drying obtain after atomization, drying temperature is 110 ~ 300 DEG C, hydrogen loss≤3.0%;
C, reduction: above-mentioned water atomization hair powder is reduced through reduction furnace, reduction furnace reduction preheating section temperature 550 ~ 800 DEG C of high temperature section temperature 800 ~ 1000 DEG C, cooling section temperature 500 ~ 800 DEG C, ammonia flow 60 ~ 190m
3/ h, travelling speed 90 ~ 300 ㎜/min, bed thickness 12 ~ 48 ㎜; Obtain water atomized iron powder;
Water atomized iron powder that d, step c obtain through broken, screening, to close batch, detect and obtain finished product water atomized iron powder;
2) prepare high-alloy steel powder, comprise smelting, atomization, its operation steps is as follows:
A, smelting: with various alloy and iron alloy for main raw material, smelted by high-frequency furnace and obtain the molten steel that uniform composition is stablized, impurity is few, tapping temperature: 1500 ~ 1700 DEG C, its chemical composition is by weight percentage:
Ni:5-12%, Cr:11-19%, Co:26-35%, Mo:15-25%, Si:0.3-1.5%, V:0.5-3.3%, C :≤4.0%, surplus is Fe; , above composition summation is 100%;
B, atomization: atomization process is implemented by aerosolization system, atomizing pressure: 50 ~ 130Mpa, and medium is nitrogen;
C, the high-alloy steel powder obtained are criticized through sieving, closing, detection obtains finished product high-alloy steel powder;
3) segregation-free bonding, add in mixer by above-mentioned finished product high-alloy steel powder and finished product water atomized iron powder by 1:5, mix and heat, mixture chemical composition is by weight percentage: Ni:1.0-2.4%, Cr:2.2-3.8%, Co:5.2-7.0%, Mo:3.0-5.0%, Si:0.06-0.3%, V:0.1-0.66%, C :≤0.8%, surplus is Fe, and above composition summation is 100%; When temperature reaches 50 ~ 140 DEG C, spray into the polyoxyethylene glycol of mixture weight per-cent 0.001% ~ 1.0%, mix 60 ~ 100 minutes, volatile matter is extracted out to be cooled to less than 40 DEG C by vacuum, the micro mist wax adding mixture weight per-cent 0.5 ~ 1.2% again mixes rear packaging, obtains finished product special metals comminuted steel shot.
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| CN106148827A (en) * | 2016-08-15 | 2016-11-23 | 合肥万向钱潮汽车零部件有限公司 | A kind of automobile cross axle |
| US20190351483A1 (en) * | 2017-02-02 | 2019-11-21 | Jfe Steel Corporation | Mixed powder for powder metallurgy, sintered body, and method for producing sintered body |
| JP6627856B2 (en) * | 2017-02-02 | 2020-01-08 | Ｊｆｅスチール株式会社 | Method for producing powder mixture for powder metallurgy and sintered body |
| KR102288887B1 (en) * | 2017-04-10 | 2021-08-12 | 현대자동차주식회사 | Method of manufacturing iron powder and iron powder manufactured thereby |
| CN113649559B (en) * | 2021-08-03 | 2023-08-15 | 鞍钢(鞍山)冶金粉材有限公司 | Straight gear mixed iron powder for powder metallurgy and preparation method thereof |
| CN117259758B (en) * | 2023-10-05 | 2024-03-29 | 广东三浩铸锻科技有限公司 | Method for preparing part from waste steel |
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| CN1410208A (en) * | 2002-11-25 | 2003-04-16 | 莱芜钢铁集团粉末冶金有限公司 | Manufacturing method of alloy steel powder by spraying etc. |
| CN101413082A (en) * | 2008-11-26 | 2009-04-22 | 莱芜钢铁集团粉末冶金有限公司 | Easy-to-cut water atomized steel powder and production method thereof |
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| JP4412133B2 (en) * | 2004-09-27 | 2010-02-10 | Ｊｆｅスチール株式会社 | Iron-based mixed powder for powder metallurgy |
| US7892314B2 (en) * | 2005-08-26 | 2011-02-22 | Apex Advanced Technologies, Llc | Powder metal composition containing micronized deformable solids and methods of making and using the same |
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| CN1410208A (en) * | 2002-11-25 | 2003-04-16 | 莱芜钢铁集团粉末冶金有限公司 | Manufacturing method of alloy steel powder by spraying etc. |
| CN101413082A (en) * | 2008-11-26 | 2009-04-22 | 莱芜钢铁集团粉末冶金有限公司 | Easy-to-cut water atomized steel powder and production method thereof |
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Effective date of registration: 20170331 Address after: Lingshan Hongqi Road 114042 Anshan city of Liaoning Province, Lishan District No. 9 Patentee after: Anshan Iron and steel (Anshan) metallurgical powder Co., Ltd. Address before: Anshan City, Liaoning province 114031 Lishan District Jianguo Road 40 A Patentee before: Angang Heavy Machinery Co., Ltd. |
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