CN105234408A - High-strength and high-corrosion-resistance powder metallurgy stainless steel material manufacturing method - Google Patents
High-strength and high-corrosion-resistance powder metallurgy stainless steel material manufacturing method Download PDFInfo
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- CN105234408A CN105234408A CN201510681643.1A CN201510681643A CN105234408A CN 105234408 A CN105234408 A CN 105234408A CN 201510681643 A CN201510681643 A CN 201510681643A CN 105234408 A CN105234408 A CN 105234408A
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Abstract
The invention discloses a high-strength and high-corrosion-resistance powder metallurgy stainless steel material manufacturing method. The method is characterized by comprising the steps that tin powder with the mass percent being 1-2% is added in stainless steel powder; and a mesh belt sintering furnace is adopted for carrying out secondary sintering on a vacuum sintered product, and decomposition ammonia gas is introduced in the mesh belt furnace sintering process. By the adoption of the technology, the obtained product is higher in strength, the crushing strength of the product can be improved to more than 600 MPa, the product can pass a 48-hour salt spray test, product performance is obviously improved, the application range is wider, and the increasingly stringent requirements of clients can be met better.
Description
Technical field
The present invention relates to a kind of high strength, strong corrosion resistance powder metallurgical stainless steel material fabrication process.
Background technology
Adopt the stainless steel products that powder metallurgy traditional handicraft is produced, its crushing strength is at below 450MPa, and corrosion resistance is poor, and after 24 hours salt spray tests, its surface can produce rust staining.
Because its intensity is low, corrosion-resistant, cause range of application to be very restricted, can not meet the demands under a lot of operating mode.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of high strength, strong corrosion resistance powder metallurgical stainless steel material fabrication process, the product obtained has higher intensity, its crushing strength can bring up to more than 600MPa, and by 48 hours salt spray tests, properties of product significantly improve, and range of application is more extensive, more can meet the demand of client's increasingly stringent.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of high strength, strong corrosion resistance powder metallurgical stainless steel material fabrication process, add the glass putty that mass percent is 1 ~ 2% in stainless steel powder; Adopt net strip sintering furnace to carry out double sintering to the goods after vacuum-sintering, in meshbeltfurnace sintering process, pass into cracked ammonium gas.
As the improvement of technique scheme, guipure sintering comprises the steps:
A, after vacuum-sintering sintered metal product utilize transmit guipure be sent in net strip sintering furnace, the heater element in net strip sintering furnace and furnace bladder material select carbofrax material;
B, heat net strip sintering furnace, sintering temperature controls at 1120 ~ 1200 °, and sintering time controls at 2 ~ 3 hours;
C, the product after sintering immersed in machine oil process;
D, the product after immersion oil is carried out deburring operation.
As the further improvement of technique scheme, in whole sintering process, the burner hearth front and back end of net strip sintering furnace respectively configures a blow vent.
Further, in net strip sintering furnace, temperature controls to be divided into temperature rise period, holding stage and cooling stage, temperature rise period temperature is 0 ~ 1120 °, and the time is 30 ~ 90 minutes, and holding stage temperature is 1120 ~ 1200 °, time is 2 ~ 3 hours, and cooling stage is nature cooling.
Further, holding stage temperature is 1150 °.
Preferably, in stainless steel powder, the glass putty that mass percent is 1.5% is added.
The invention has the beneficial effects as follows: the present invention adopting above-mentioned technique, the product obtained has higher intensity, its crushing strength can bring up to more than 600MPa, and by 48 hours salt spray tests, properties of product significantly improve, range of application is more extensive, more can meet the demand of client's increasingly stringent.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further detailed explanation.
A kind of high strength of the present invention, strong corrosion resistance powder metallurgical stainless steel material fabrication process, the glass putty that mass percent is 1 ~ 2% is added in stainless steel powder, preferred mass percentage is 1.5%, the rapid raising that the interpolation of glass putty makes anti-corrosive properties obtain, tin in high-temperature sintering process with the intermetallic compound of Fe and the Cr administration measure in material, disperse is present in whole stainless steel base, the rust-preventing characteristic of goods is improved greatly, guarantees that goods produce without rusty stain by 48 hours salt spray tests; Net strip sintering furnace is adopted to carry out double sintering to the goods after vacuum-sintering; cracked ammonium gas is passed in meshbeltfurnace sintering process; it is obtained after decomposition, drying by ammonia for decomposing ammonia; its main component is hydrogen and nitrogen; wherein hydrogen has reduction; nitrogen not only has the not oxidized effect of product in protection burner hearth; nitrogenation can also be played with goods; be conducive to the intensity and the hardness that improve goods; make up the shortcoming that guipure sintering temperature is low, ensure that the crushing strength of new product brings up to more than 600MPa.
In the present embodiment, guipure sintering comprises the steps:
A, after vacuum-sintering sintered metal product utilize transmit guipure be sent in net strip sintering furnace, the heater element in net strip sintering furnace and furnace bladder material select carbofrax material;
B, heat net strip sintering furnace, sintering temperature controls at 1120 ~ 1200 °, and sintering time controls at 2 ~ 3 hours;
C, the product after sintering immersed in machine oil process;
D, the product after immersion oil is carried out deburring operation.
In the present embodiment, in whole sintering process, the burner hearth front and back end of net strip sintering furnace respectively configures a blow vent, to ensure there is the gas of q.s in burner hearth as protection, effectively avoids product oxidized or dirtyization in sintering process.
In the present embodiment, in net strip sintering furnace, temperature controls to be divided into temperature rise period, holding stage and cooling stage, temperature rise period temperature is 0 ~ 1120 °, and the time is 30 ~ 90 minutes, and holding stage temperature is 1120 ~ 1200 °, according to test and experimental data, best holding stage temperature is 1150 °, and the time is 2 ~ 3 hours, and cooling stage is nature cooling.
In an embodiment, have chosen three parameters and test,
| Time temperature rise period | Holding stage temperature | The holding stage time |
| 30 minutes | 1120° | 2 minutes |
| 60 minutes | 1150° | 2.5 minute |
| 90 minutes | 1200° | 3 minutes |
Through test, the crushing strength of the goods obtained is all at more than 600MPa.
The above, just preferred embodiment of the present invention, but the present invention is not limited to above-mentioned embodiment, as long as it reaches technique effect of the present invention with any same or similar means, all should fall within protection scope of the present invention.
Claims (6)
1. high strength, a strong corrosion resistance powder metallurgical stainless steel material fabrication process, is characterized in that: in stainless steel powder, add the glass putty that mass percent is 1 ~ 2%; Adopt net strip sintering furnace to carry out double sintering to the goods after vacuum-sintering, in meshbeltfurnace sintering process, pass into cracked ammonium gas.
2. a kind of high strength according to claim 1, strong corrosion resistance powder metallurgical stainless steel material fabrication process, is characterized in that: guipure sintering comprises the steps:
A, after vacuum-sintering sintered metal product utilize transmit guipure be sent in net strip sintering furnace, the heater element in net strip sintering furnace and furnace bladder material select carbofrax material;
B, heat net strip sintering furnace, sintering temperature controls at 1120 ~ 1200 °, and sintering time controls at 2 ~ 3 hours;
C, the product after sintering immersed in machine oil process;
D, the product after immersion oil is carried out deburring operation.
3. a kind of high strength according to claim 2, strong corrosion resistance powder metallurgical stainless steel material fabrication process, it is characterized in that: in whole sintering process, the burner hearth front and back end of net strip sintering furnace respectively configures a blow vent.
4. a kind of high strength according to claim 3, strong corrosion resistance powder metallurgical stainless steel material fabrication process, it is characterized in that: in net strip sintering furnace, temperature controls to be divided into temperature rise period, holding stage and cooling stage, temperature rise period temperature is 0 ~ 1120 °, time is 30 ~ 90 minutes, holding stage temperature is 1120 ~ 1200 °, and the time is 2 ~ 3 hours, and cooling stage is nature cooling.
5. a kind of high strength according to claim 4, strong corrosion resistance powder metallurgical stainless steel material fabrication process, is characterized in that: holding stage temperature is 1150 °.
6. a kind of high strength according to claim arbitrary in claim 1 ~ 5, strong corrosion resistance powder metallurgical stainless steel material fabrication process, is characterized in that: in stainless steel powder, add the glass putty that mass percent is 1.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510681643.1A CN105234408A (en) | 2015-10-20 | 2015-10-20 | High-strength and high-corrosion-resistance powder metallurgy stainless steel material manufacturing method |
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| CN201510681643.1A CN105234408A (en) | 2015-10-20 | 2015-10-20 | High-strength and high-corrosion-resistance powder metallurgy stainless steel material manufacturing method |
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| CN105234408A true CN105234408A (en) | 2016-01-13 |
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| CN201510681643.1A Pending CN105234408A (en) | 2015-10-20 | 2015-10-20 | High-strength and high-corrosion-resistance powder metallurgy stainless steel material manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102258486B1 (en) | 2020-07-13 | 2021-05-31 | 주식회사 경진 | Method For Manufacturing Sintered Products With Improved Corrosion Resistance By Using Stainless Steel Powder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5565302A (en) * | 1978-11-11 | 1980-05-16 | Kanto Yakin Kogyo Kk | Diffusion sintering method of powder metal |
| CN1660527A (en) * | 2005-01-27 | 2005-08-31 | 华南理工大学 | Warm press forming method in high density and low temperature for powder of stainless steel |
| CN101249564A (en) * | 2008-03-26 | 2008-08-27 | 浙江中平粉末冶金有限公司 | Powder metallurgy technique |
-
2015
- 2015-10-20 CN CN201510681643.1A patent/CN105234408A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5565302A (en) * | 1978-11-11 | 1980-05-16 | Kanto Yakin Kogyo Kk | Diffusion sintering method of powder metal |
| CN1660527A (en) * | 2005-01-27 | 2005-08-31 | 华南理工大学 | Warm press forming method in high density and low temperature for powder of stainless steel |
| CN101249564A (en) * | 2008-03-26 | 2008-08-27 | 浙江中平粉末冶金有限公司 | Powder metallurgy technique |
Non-Patent Citations (1)
| Title |
|---|
| O. COOVATTANACHAI ET AL: "Performance improvement of P/M 316L by addition of liquid phase forming powder", 《MATERIALS SCIENCE AND ENGINEERING》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102258486B1 (en) | 2020-07-13 | 2021-05-31 | 주식회사 경진 | Method For Manufacturing Sintered Products With Improved Corrosion Resistance By Using Stainless Steel Powder |
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Application publication date: 20160113 |