CN102049523A - Free-cutting water-atomized steel powder and preparation method thereof - Google Patents
Free-cutting water-atomized steel powder and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the powder metallurgy field and particularly relates to a preparation method of free-cutting water-atomized steel powder. The method comprises the following steps of smelting, water atomization and reduction. The method provided by the invention is characterized in that the S content in the steel powder is controlled by adding high sulfur iron alloy. The method comprises the following operation steps: 1) smelting; 2) performing the water atomization technology; and 3) reducing. The free-cutting water-atomized steel powder prepared by the method comprises the following chemical components in percentage by weight: 0.10-0.20% of C, 0.20-0.35% of Si, 0.10-0.30% of Mn, 0-0.01% of P, 0.30-0.45% of S, 1.1-1.5ppm of [o] and balance of Fe and inevitable impurities. The water-atomized steel powder has the following beneficial effects: the used steel scrap raw material has low cost, the cutting property can be effectively improved, the service life of the cutting tool can be increased, and the steel powder is suitable for large-scale powder metallurgical products.
Description
Technical field
The invention belongs to field of powder metallurgy, relate in particular to a kind of easy-to-cut water atomized steel powder and manufacture method thereof.
Background technology
Easy-to-cut water atomized steel powder is mainly used in the occasion of the powder metallurgy parts of high strength such as production automobile engine parts, gear shifting box synchronizer gear hub, high density, high dimensional accuracy, under these occasions, require behind sintering, to carry out machining and boring processing, therefore require product will have good cutting performance at pulverulent product.The scheme of improving the powder cutting ability is a lot, great majority are to add cutting composition fast such as S or MnS in powder, but because S or MnS powder particle are tiny, the composition of the easy cutting mixture powder of manufacturing mixes inhomogeneous, so cause the cutting ability of sintered article not good, damage the shortcoming of cutter head easily.
The patent No. be ZL94117334.8 disclosure of the Invention a kind of " atomized iron powder that machinability and dimensional accuracy are good " in it is formed strict restriction content S:0.005～0.3% of S, this method has been made improvement to the cutting ability of sintered steel, but its technical scheme has certain limitation, be exactly in the upper control limit system of the content of S the raising of cutting ability.
Summary of the invention
Purpose of the present invention provides a kind of easy-to-cut water atomized steel powder and manufacture method thereof, improves the cutting ability of product, reduces the tool wear that adds man-hour.
For solving the problems of the technologies described above, technical scheme of the present invention is:
The easy-to-cut water atomized steel powder manufacture method comprises smelting, water atomization, reduction, it is characterized in that, to add the mode of high sulfur-iron alloy, controls the content of S in the steel powder, and its operating procedure is as follows:
1) smelt,, obtain the molten steel that composition is uniform and stable, impurity is few the steel scrap electric furnace smelting, when 1690 ± 20 ℃ of temperature, the high sulfur-iron alloy of adding S content 50～85% in molten steel, addition is 10～15kg/ ton, granularity 20～80 orders are till stirring.
2) water atomization technological parameter, 1750 ± 10 ℃ of the tapping temperatures of molten steel, 1680 ± 10 ℃ of temperature of atomizing beginning, 1650 ± 5 ℃ of final temperatures of atomizing, molten steel liquid flow diameter 30～35mm, molten steel atomization speed 3.1～3.8kg/s, high pressure hydraulic pressure 115 ± 10MPA, flow 185 ± 5m
3/ hour, 23 ± 2 ° of spray angles.
3) reduction, 700 ℃～850 ℃ of reduction furnace preheating section temperature ranges, 5～5.5 meters of length, 900～940 ℃ of reduction high temperature section temperature ranges, 8～9 meters of length, 900～800 ℃ of reduction cooling section temperature ranges, 4～5 meters of length, cracked ammonium throughput: 110～120m
3/ h, tape speed: 200～220mm/min, fabric thickness: 25～30mm.
The easy-to-cut water atomized steel powder that described method is made, it is characterized in that, its chemical composition is composed as follows by weight percentage: C:0.10～0.20%, Si:0.20～0.35%, Mn:0.10～0.30%, P:0～0.01%, S:0.30～0.45%, [o]: 1.1～1.5ppm, all the other are Fe and other unavoidable impurities.
Compared with prior art, the invention has the beneficial effects as follows: it is stable that the present invention uses cheap raw scrap material to have Composition Control, and chemical high purity, cost are low, can effectively improve cutting ability, improve the life-span of cutting tool, process flow is short, the production efficiency height is suitable for large-scale production; Ferrous powder granules shape size and size distribution etc. all can be adjusted within the specific limits, lay a good foundation for high density, high strength, high accuracy, wear-resisting, anti-corrosion, complex-shaped metallic sintered products that automobile uses, are better than the product of producing with reduced powder of the same type.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further:
The easy-to-cut water atomized steel powder manufacture method comprises smelting, water atomization, reduction, to add the mode of high sulfur-iron alloy, controls the content of S in the steel powder, and its operating procedure is as follows:
1) smelt,, obtain the molten steel that composition is uniform and stable, impurity is few the steel scrap electric furnace smelting, when 1690 ± 20 ℃ of temperature, the high sulfur-iron alloy of adding S content 50～85% in molten steel, addition is 10～15kg/ ton, granularity 20～80 orders are till stirring.
2) water atomization technological parameter, 1750 ± 10 ℃ of the tapping temperatures of molten steel, 1680 ± 10 ℃ of temperature of atomizing beginning, 1650 ± 5 ℃ of final temperatures of atomizing, molten steel liquid flow diameter 30～35mm, molten steel atomization speed 3.1～3.8kg/s, high pressure hydraulic pressure 115 ± 10MPA, flow 185 ± 5m
3/ hour, 23 ± 2 ° of spray angles.
3) reduction, 700 ℃～850 ℃ of reduction furnace preheating section temperature ranges, 5～5.5 meters of length, 900～940 ℃ of reduction high temperature section temperature ranges, 8～9 meters of length, 900～800 ℃ of reduction cooling section temperature ranges, 4～5 meters of length, cracked ammonium throughput: 110～120m
3/ h, tape speed: 200～220mm/min, fabric thickness: 25～30mm.
The easy-to-cut water atomized steel powder that above-mentioned method is made, its chemical composition is composed as follows by weight percentage: C:0.10～0.20%, Si:0.20～0.35%, Mn:0.10～0.30%, P:0～0.01%, S:0.30～0.45%, [o]: 1.1～1.5ppm, all the other are Fe and other unavoidable impurities.
Above-mentioned reduced powder through fragmentation, screening, the batch mixing of reduction burner, close that batch to obtain granularity be the easy-to-cut water atomized iron powder finished products of 20～80 purposes.In reduction process, both carried out the process of decarburization, deoxidation, reduction powder particle hardness, raising powder plasticity, carry out the powder particle aggregation procedure again, make between the thin powder particle or thin powder bonded carries out powder particle in thick powder particle surface and reunites, make the powder particle surface complexity, class is spongy.
Below respectively the composition performance and the cutting ability of easy cutting iron powder of the present invention and water atomization straight iron powder compared test, method of testing is as follows:
1) compression performance; In steel powder, add 1.0% Cu, 1.0% graphite, 0.55% W wax, 0.05% Ac wax batch mixing 40 minutes, is pressed into the 40g powder with the forcing press of 600t the cylinder bulk density of φ 20.
2) cutting ability: iron powder is pressed into the cylindrical blank sample of the high 10mm of diameter 50mm, green density 6.85g/cm
3, at 1120 ℃ of sintering 40 minutes in hydrogen, with 10000rpm, 0.012mm/rev, processing conditions processing down is till can not processing with the steel rotary head of diameter 1mm.
See Table 1, table 2, by the average of the 6 groups of drill bit drilling samples life-span as drill bit is compared, preceding 3 groups are easy cutting iron powder sample of the present invention, the back is a water atomization straight iron powder sample for 3 groups, after contrast finds that sulfur content improves, the tool wear degree significantly reduces, thereby the free cutting property of proof sample has improved.
Table 1 embodiment steel powder composition parameter
| Numbering | C％ | Si％ | Mn％ | P％ | S％ | [o] |
| 11 | 0.02 | 0.10 | 0.15 | 0.010 | 0.45 | 0.13 |
| 12 | 0.03 | 0.09 | 0.11 | 0.009 | 0.36 | 0.07 |
| 13 | 0.02 | 0.05 | 0.10 | 0.011 | 0.31 | 0.10 |
| 14 | 0.02 | 0.10 | 0.10 | 0.010 | 0.010 | 0.09 |
| 15 | 0.04 | 0.10 | 0.08 | 0.009 | 0.029 | 0.08 |
| 16 | 0.03 | 0.09 | 0.13 | 0.010 | 0.20 | 0.11 |
Contrast of table 2 cutting ability and easy cutting iron powder cutting experiment
Claims (2)
1. the easy-to-cut water atomized steel powder manufacture method comprises smelting, water atomization, reduction, it is characterized in that, to add the mode of high sulfur-iron alloy, controls the content of S in the steel powder, and its operating procedure is as follows:
1) smelt,, obtain the molten steel that composition is uniform and stable, impurity is few the steel scrap electric furnace smelting, when 1690 ± 20 ℃ of temperature, the high sulfur-iron alloy of adding S content 50～85% in molten steel, addition is 10～15kg/ ton, granularity 20～80 orders are till stirring.
2) water atomization technological parameter, 1750 ± 10 ℃ of the tapping temperatures of molten steel, 1680 ± 10 ℃ of temperature of atomizing beginning, 1650 ± 5 ℃ of final temperatures of atomizing, molten steel liquid flow diameter 30～35mm, molten steel atomization speed 3.1～3.8kg/s, high pressure hydraulic pressure 115 ± 10MPA, flow 185 ± 5m
3/ hour, 23 ± 2 ° of spray angles.
3) reduction, 700 ℃～850 ℃ of reduction furnace preheating section temperature ranges, 5～5.5 meters of length, 900～940 ℃ of reduction high temperature section temperature ranges, 8～9 meters of length, 900～800 ℃ of reduction cooling section temperature ranges, 4～5 meters of length, cracked ammonium throughput: 110～120m
3/ h, tape speed: 200～220mm/min, fabric thickness: 25～30mm.
2. the easy-to-cut water atomized steel powder that method according to claim 1 is made, it is characterized in that, its chemical composition is composed as follows by weight percentage: C:0.10～0.20%, Si:0.20～0.35%, Mn:0.10～0.30%, P:0～0.01%, S:0.30～0.45%, [o]: 1.1～1.5ppm, all the other are Fe and other unavoidable impurities.
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| CN102744400A (en) * | 2012-06-21 | 2012-10-24 | 芜湖禾丰离合器有限公司 | Automobile transmission gear based on copper aluminum steel sintering by powder metallurgy technology and manufacture method of automobile transmission gear |
| CN102756122A (en) * | 2012-06-21 | 2012-10-31 | 芜湖禾丰离合器有限公司 | Powder-metallurgy automobile transmission gear and manufacturing method thereof |
| CN102756123A (en) * | 2012-06-21 | 2012-10-31 | 芜湖禾丰离合器有限公司 | Automobile clutch gear with sintered copper, aluminum and steel based on powder metallurgy technology and manufacturing method of automobile clutch gear |
| CN102756128A (en) * | 2012-06-21 | 2012-10-31 | 芜湖禾丰离合器有限公司 | Automobile clutch flange plate based on scrap steel and scrap iron powder sintered copper aluminum steel and making method of automobile clutch flange plate |
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| CN112267003A (en) * | 2020-09-24 | 2021-01-26 | 山东鲁银新材料科技有限公司 | Preparation method of water atomized pure iron powder with ultrahigh cleanliness, low oxygen and high performance |
| CN114932215A (en) * | 2022-05-26 | 2022-08-23 | 辽宁晟钰新材料科技有限公司 | Free-cutting iron powder with high bulk density and high compression performance and production method thereof |
| CN115780816A (en) * | 2022-12-14 | 2023-03-14 | 吉凯恩(霸州)金属粉末有限公司 | Production process of superfine atomized iron powder for new energy battery |
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| SE513498C2 (en) * | 1993-09-01 | 2000-09-18 | Kawasaki Steel Co | Atomized steel powder and sintered steel with good machinability made thereof |
| 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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| CN102756122A (en) * | 2012-06-21 | 2012-10-31 | 芜湖禾丰离合器有限公司 | Powder-metallurgy automobile transmission gear and manufacturing method thereof |
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| CN102756128A (en) * | 2012-06-21 | 2012-10-31 | 芜湖禾丰离合器有限公司 | Automobile clutch flange plate based on scrap steel and scrap iron powder sintered copper aluminum steel and making method of automobile clutch flange plate |
| CN102756123B (en) * | 2012-06-21 | 2014-03-12 | 芜湖禾丰离合器有限公司 | Automobile clutch gear with sintered copper, aluminum and steel based on powder metallurgy technology and manufacturing method of automobile clutch gear |
| CN102756122B (en) * | 2012-06-21 | 2014-04-02 | 芜湖禾丰离合器有限公司 | Powder-metallurgy automobile transmission gear and manufacturing 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. |