CN101966591A - Single-step operating production method of high-nitrogen stainless steel powder - Google Patents
Single-step operating production method of high-nitrogen stainless steel powder Download PDFInfo
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- CN101966591A CN101966591A CN 201010276234 CN201010276234A CN101966591A CN 101966591 A CN101966591 A CN 101966591A CN 201010276234 CN201010276234 CN 201010276234 CN 201010276234 A CN201010276234 A CN 201010276234A CN 101966591 A CN101966591 A CN 101966591A
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Abstract
The invention relates to a single-step operating production method which comprises the following step of: successively performing a hydrogen reduction reaction and a nitridation reaction of iron, nickel ad chromium composite oxides in a hydrogen gas and nitrogen gas mixed atmosphere to produce high-nitrogen stainless steel powder. Hydrogen gas comprises pure hydrogen gas, natural gas, coal gas and the like.
Description
Nitrogen adds in the austenitic stainless steel as strong austenite stabilizer element, can significantly improve the mechanical property and the decay resistance of steel, the nickel of alternative costliness in some steel, and improve the biocompatibility of medical stainless steel.Therefore, high nitrogen stainless steel is considered to the most promising new engineering material.The eighties in 20th century, the research and development of high nitrogen stainless steel have been subjected to the great attention on international metallurgical boundary, and develop high temperature insostatic pressing (HIP) (HIP), pressurization induction furnace melting, pressurization electroslag melting high pressure smelting high nitrogen stainless steel technologies of preparing such as (PESR) successively, but these smelting processes all exist the energy consumption height, need shortcoming such as complex device.And powder metallurgy has economical with materials, environment cleaning, composition evenly and favorable reproducibility, can produce high-quality and complex-shaped advantages such as part, therefore is subjected to extensive attention.
The high nitrogen stainless steel powder that one of powder metallurgy crux of high nitrogen stainless steel is a preparation nitrogen content height, granularity is little.At present, the main method for preparing the high nitrogen stainless steel powder both at home and abroad has: high pressure melting gas atomization, centrifugal atomizing, plasma rotating electrode, methods such as solid state powder nitrogenize, mechanical alloying.These methods that prepare the high nitrogen stainless steel powder all are the physics methods, and their raw material is the stainless steel block material that has prepared, and prepares powder under high temperature fused state, nitriding or nitrogenize under the solid state powder state in preparation process.At present, the siderochrome ni compound oxide carries out hydrogen reduction reaction and nitridation reaction successively in the mixed atmosphere of hydrogen nitrogen, and the document of producing the high nitrogen stainless steel powder does not appear in the newspapers.
The present invention relates to the siderochrome ni compound oxide and in the mixed atmosphere of hydrogen nitrogen, carry out hydrogen reduction reaction and nitridation reaction successively, produce the single stepping production method of high nitrogen stainless steel powder.Hydrogen comprises pure hydrogen, natural gas, coal gas etc.
Realize production method technical scheme of the present invention, comprise the following steps:
1, raw material is prepared: be to be raw material with solubility Fe, Cr, Ni salt and NaOH, the particle diameter of employing liquid-phase coprecipitation production is 0.01～20 micron Fe, Cr, the composite oxide power of Ni three elements.
2, produce preparation: system places the exhaust flow path state the gas-solid phase continuous reactor of closed circulation, uses the nitrogen deaeration.Again closed circulation gas-solid phase continuous reactor system is placed closed circulation stream state, feed appropriate amount of hydrogen.Open gas pump under closed state hydrogen-nitrogen mixture gas is circulated in system, reduction furnace is warming up to required temperature constant temperature.
3, produce continuously: with raw material input device raw material is input in the boiler tube, with the raw material pushing in device raw material is pushed in the porcelain boat what flat-temperature zone that fills raw material singly continuously and carry out reduction reaction, the speed that pushes raw material is determined according to technological parameter.Technological process is: raw material → dress sample → continuously is from injection port sample introduction → high-temperature hydrogen reduction → nitrogenize → cooling → come out of the stove → the high nitrogen stainless steel powder-product from outlet continuously.The decline of pressure suitably mends hydrogen and nitrogen (both are maintained at about 1: 3 at ratio) in the system, and pressure is little negative pressure in the maintenance system.
4, the packing of product: particle diameter is directly packed into greater than 1 micron high nitrogen stainless steel powder in the thick matter polybag, the 25Kg papery of packing into pail pack; Less than 1 micron, especially nano level high nitrogen stainless steel powder is incorporated with the irony pail pack of protective atmosphere.
Embodiment 1:
1, raw material is prepared: be to be raw material with solubility Fe, Cr, Ni salt and NaOH, the particle diameter of employing liquid-phase coprecipitation production is 0.01～0.1 micron Fe, Cr, the composite oxide power of Ni three elements.
2, produce preparation: system places the exhaust flow path state closed circulation gas-solid phase continuous reactor, uses the nitrogen deaeration.Again closed circulation gas-solid phase continuous reactor system is placed closed circulation stream state, feed appropriate amount of hydrogen.Open gas pump under closed state hydrogen-nitrogen mixture gas is circulated in system, reduction furnace is warming up to 800～1000 ℃ of constant temperature.
3, produce continuously: with raw material input device raw material is input in the boiler tube, with the raw material pushing in device raw material is pushed in the porcelain boat what flat-temperature zone that fills raw material singly continuously and carry out reduction reaction, the speed that pushes raw material is determined according to technological parameter.Technological process is: raw material → dress sample → continuously is from injection port sample introduction → high-temperature hydrogen reduction → nitrogenize → cooling → come out of the stove → the high nitrogen stainless steel powder-product from outlet continuously.The decline of pressure suitably mends hydrogen and nitrogen (both are maintained at about 1: 3 at ratio) in the system, and pressure is little negative pressure in the maintenance system.
4, the packing of product: the 10Kg irony pail pack that is incorporated with protective atmosphere.
Embodiment 2:
1, raw material is prepared: be to be raw material with solubility Fe, Cr, Ni salt and NaOH, the particle diameter of employing liquid-phase coprecipitation production is 0.1～20 micron Fe, Cr, the composite oxide power of Ni three elements.
2, equipment is prepared: raw material is put into porcelain boat, porcelain boat (raw material) is put in the injection port, with sample pusher porcelain boat (raw material) is pushed in the continuous closed circulation reacting furnace condenser.Triple valve is placed system exhaust stream state, use the nitrogen deaeration.Triple valve is placed system lock circular flow line state, feed appropriate amount of hydrogen.Open gas pump hydrogen-nitrogen mixture gas is circulated in system, reduction furnace is warming up to 1000～1400 ℃ of constant temperature.
3, produce continuously: with raw material input device raw material is input in the boiler tube, with the raw material pushing in device raw material is pushed in the porcelain boat what flat-temperature zone that fills raw material singly continuously and carry out reduction reaction, the speed that pushes raw material is determined according to technological parameter.Technological process is: raw material → dress sample → continuously is from injection port sample introduction → high-temperature hydrogen reduction → nitrogenize → cooling → come out of the stove → the high nitrogen stainless steel powder-product from outlet continuously.The decline of pressure suitably mends hydrogen and nitrogen (both are maintained at about 1: 3 at ratio) in the system, and pressure is little negative pressure in the maintenance system.
4, the packing of product: the high nitrogen stainless steel powder is directly packed in the thick matter polybag, the 25Kg papery of packing into pail pack.
Claims (2)
1. the siderochrome ni compound oxide carries out hydrogen reduction reaction and nitridation reaction successively in 1000～1400 ℃ of scopes in the mixed atmosphere of hydrogen nitrogen, produces the single stepping production method of high nitrogen stainless steel powder.
2. siderochrome nickel nano composite oxide carries out hydrogen reduction reaction and nitridation reaction, the single stepping production method of production nanometer high nitrogen stainless steel powder successively in 800～1000 ℃ of scopes in the mixed atmosphere of hydrogen nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010276234 CN101966591A (en) | 2010-09-09 | 2010-09-09 | Single-step operating production method of high-nitrogen stainless steel powder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010276234 CN101966591A (en) | 2010-09-09 | 2010-09-09 | Single-step operating production method of high-nitrogen stainless steel powder |
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| CN101966591A true CN101966591A (en) | 2011-02-09 |
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| CN 201010276234 Pending CN101966591A (en) | 2010-09-09 | 2010-09-09 | Single-step operating production method of high-nitrogen stainless steel powder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255409A (en) * | 2013-05-13 | 2013-08-21 | 上海大学 | Method of preparing stainless steel coating on surface of low carbon steel based on nanotechnology |
| CN113199030A (en) * | 2021-04-25 | 2021-08-03 | 西安建筑科技大学 | Method for preparing 3D printing stainless steel powder by ion nitriding |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10265803A (en) * | 1997-03-24 | 1998-10-06 | Kawasaki Steel Corp | Production of ferrous powder for powder metallurgy |
| JPH10280001A (en) * | 1997-04-10 | 1998-10-20 | Kawasaki Steel Corp | Production of steel powder for powder metallurgy |
| CN1618554A (en) * | 1997-12-25 | 2005-05-25 | 日亚化学工业株式会社 | Process for producing Sm-Fe-N alloy powder |
| US20050129563A1 (en) * | 2003-12-11 | 2005-06-16 | Borgwarner Inc. | Stainless steel powder for high temperature applications |
-
2010
- 2010-09-09 CN CN 201010276234 patent/CN101966591A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10265803A (en) * | 1997-03-24 | 1998-10-06 | Kawasaki Steel Corp | Production of ferrous powder for powder metallurgy |
| JPH10280001A (en) * | 1997-04-10 | 1998-10-20 | Kawasaki Steel Corp | Production of steel powder for powder metallurgy |
| CN1618554A (en) * | 1997-12-25 | 2005-05-25 | 日亚化学工业株式会社 | Process for producing Sm-Fe-N alloy powder |
| US20050129563A1 (en) * | 2003-12-11 | 2005-06-16 | Borgwarner Inc. | Stainless steel powder for high temperature applications |
Non-Patent Citations (1)
| Title |
|---|
| 《北京科技大学学报》 20051231 关璐等 用机械合金法制备含氮不锈钢粉末 第27卷, 第6期 2 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255409A (en) * | 2013-05-13 | 2013-08-21 | 上海大学 | Method of preparing stainless steel coating on surface of low carbon steel based on nanotechnology |
| CN113199030A (en) * | 2021-04-25 | 2021-08-03 | 西安建筑科技大学 | Method for preparing 3D printing stainless steel powder by ion nitriding |
| CN113199030B (en) * | 2021-04-25 | 2023-08-15 | 西安建筑科技大学 | Method for preparing 3D printing stainless steel powder by utilizing ion nitriding |
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Application publication date: 20110209 |