EP0050969B1 - Alloy steel powder - Google Patents
Alloy steel powder Download PDFInfo
- Publication number
- EP0050969B1 EP0050969B1 EP19810305004 EP81305004A EP0050969B1 EP 0050969 B1 EP0050969 B1 EP 0050969B1 EP 19810305004 EP19810305004 EP 19810305004 EP 81305004 A EP81305004 A EP 81305004A EP 0050969 B1 EP0050969 B1 EP 0050969B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- final product
- powder
- alloy
- alloy powder
- powdered metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000843 powder Substances 0.000 title claims description 22
- 229910000851 Alloy steel Inorganic materials 0.000 title description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 31
- 239000000956 alloy Substances 0.000 claims description 31
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 239000011574 phosphorus Substances 0.000 claims description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- 238000005245 sintering Methods 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 239000012467 final product Substances 0.000 description 18
- 239000012255 powdered metal Substances 0.000 description 16
- 238000005260 corrosion Methods 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 4
- 238000004663 powder metallurgy Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical compound [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
- C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
Definitions
- the present invention provides a corrosion resistant iron base alloy powder and a method of producing final products using the same. More specifically, the alloy powder is a modification of a type 300 series stainless steel, with increased percentages of silicon and phosphorus. The alloy powder is useful for producing fully dense metal products by powder metallurgy techniques.
- Type 300 series stainless steels are common stainless steels used in numerous industrial applications. In attempting to make fully dense products from the atomized powder of the alloys of this type of stainless steel using powder metallurgy techniques, it is known that powder alloys of the typical compositions of the alloy series, i.e. type 304 and type 316, are difficult to sinter to full density.
- the present invention provides a high alloy steel powder useful in forming fully dense, corrosion resistant products by powder metallurgy techniques. A method of producing final products from the steel powder is also provided.
- the typical composition of the type 300 series stainless steel is changed to provide additional silicon and phosphorus.
- the invention provides an alloy steel powder containing, by weight: the balance being iron, apart from unavoidable impurities.
- the difference between the solidus and liquidus temperatures is increased to greater than 25°F (14°C) by the addition of the silicon and phosphorus, and sintering can be commercially performed within the temperature range.
- the additional silicon is usually added in a pre-alloy operation prior to atomization of the molten alloy to form a powder.
- the phosphorus can be added in the pre-alloy operation, but can also be added in the pre-alloy operation, but can also be added in an ad-mix operation. In such an ad-mix operation, the phosphorus is added in powder form to the alloy powder, usually in the form of ferro-phosphorus powder.
- the nickel content of the alloys is preferably about 12%.
- the silicon content may for example be 2-3% and is preferably about 3%.
- the phosphorus content is preferably 0.08-0.1 %.
- the maximum carbon content of the alloys is typically about 0.1%, and if desired carbon, manganese and molybdenum can be absent from the compositions.
- the powdered metal was blended with about 1% by weight Acrawax (Trademark) for die lubrication purposes. Any similar lubricant may also be used.
- the sample was compacted in a die at 50 TSI (7047 Kg/cm 2 ), the lubricant was removed in a burn off process and then the compacted sample was vacuum sintered at 2420°F (1327°C) for 90 minutes.
- the corrosion rate of the final product was 0.1 inch per year (0.25 cm/year).
- the corrosion test was performed according to practice B of ASTM A 262.
- the product was also found to be rust free in a 5% salt fog environment according to ASTM B 117-63.
- the final products can be water quenched to improve corrosion resistance, ductility, toughness and other properties.
- the final product when water quenched from a solution treatment temperature of 2100°F (1150°C) has an elongation of 40% and an unnotched impact strength of greater than 120 ft-Ib (163 joules).
- the corrosion rate of the final product was 0.04 in/yr (1 mm/yr) in boiling sulfuric acid according to practice B of ASTM A 262.
- Another iron base alloy that was water atomized and screened at -88 mesh to provide a powdered metal had the following initial analysis by weight:
- the powdered metal was compacted and sintered in a manner similar to Example 1.
- the final product had properties similar to the final product in Example 1, except that elongation improved to 26%.
- the corrosion rate was 0.047 in/yr (1.2 mm/yr).
- Another iron base alloy that was water atomized and screened at -88 mesh to provide a powdered metal had the following initial analysis by weight:
- the powdered metal was blended with about 1% by weight Acrawax (Trademark) for die lubrication purposes. Any similar lubricant may also be used.
- the sample was compacted in a die at 50 TSI (7047 Kg/cm 2 ), the lubricant was removed in a burn off process and then the compacted sample was vacuum sintered at 2430°F (1332°C) for 90 minutes.
- Another iron base alloy that was water atomized and screened at -88 mesh to provide a powdered metal had the following initial analysis by weight:
- the powdered metal was compacted and sintered in a manner similar to that set forth in Example 1.
- the final product had properties similar to the final product in Example 1, except that the corrosion rate was 0.05 in/yr (1.27 mm/yr).
- Another iron base alloy that was water atomized and screened at -88 mesh to provide a powdered metal had the following initial analysis by weight:
- the powdered metal was compacted and sintered in a manner similar to that set forth in Example 1.
- the final product has properties similar to the final product in Example 1, except that the corrosion rate was 0.037 in/yr (0.94 mm/yr).
- Another iron base alloy that was atomized and screened at -88 mesh to provide a powdered metal had the following initial analysis by weight:
- the powdered metal was compacted and sintered in a manner similar to that set forth in Example 1.
- the final product had properties similar to the final product in Example 1, except that the corrosion rate was 0.049 in/yr (1.25 mm/yr).
- Another iron base alloy that was water atomized and screened at -88 mesh to provide a powdered metal had the following initial analysis by weight:
- Example 1 The powdered metal was compacted and sintered in a manner similar to that set forth in Example 1.
- the final product had properties similar to the final product in Example 1.
- Another iron base alloy that was water atomized and screened at -88 mesh to provide a powdered metal had the following initial analysis by weight:
- the powdered metal was compacted and sintered in a manner similar to that set forth in Example 1.
- the final product had properties similar to the final product in Example 1, except that the corrosion rate was 0.10 in/yr (2.5 mm/yr).
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20052780A | 1980-10-24 | 1980-10-24 | |
| US200527 | 1988-05-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0050969A1 EP0050969A1 (en) | 1982-05-05 |
| EP0050969B1 true EP0050969B1 (en) | 1984-07-04 |
Family
ID=22742085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19810305004 Expired EP0050969B1 (en) | 1980-10-24 | 1981-10-23 | Alloy steel powder |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0050969B1 (en:Method) |
| JP (1) | JPS5798659A (en:Method) |
| BR (1) | BR8106856A (en:Method) |
| CA (1) | CA1193891A (en:Method) |
| DE (1) | DE3164598D1 (en:Method) |
| ES (1) | ES8300872A1 (en:Method) |
| IN (1) | IN153975B (en:Method) |
| MX (1) | MX156202A (en:Method) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE0102102D0 (sv) | 2001-06-13 | 2001-06-13 | Hoeganaes Ab | High density stainless steel products and method for the preparation thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3620690A (en) * | 1968-07-10 | 1971-11-16 | Minnesota Mining & Mfg | Sintered austenitic-ferritic chromium-nickel steel alloy |
| SE372293B (en:Method) * | 1972-05-02 | 1974-12-16 | Hoeganaes Ab | |
| DE2708916C2 (de) * | 1977-03-02 | 1985-07-18 | Robert Bosch Gmbh, 7000 Stuttgart | Verwendung einer hochfesten Eisen-Sinterlegierung |
-
1981
- 1981-10-16 CA CA000388061A patent/CA1193891A/en not_active Expired
- 1981-10-22 JP JP16798381A patent/JPS5798659A/ja active Granted
- 1981-10-23 BR BR8106856A patent/BR8106856A/pt unknown
- 1981-10-23 ES ES506504A patent/ES8300872A1/es not_active Expired
- 1981-10-23 EP EP19810305004 patent/EP0050969B1/en not_active Expired
- 1981-10-23 DE DE8181305004T patent/DE3164598D1/de not_active Expired
- 1981-10-24 IN IN1187/CAL/81A patent/IN153975B/en unknown
- 1981-10-26 MX MX18980581A patent/MX156202A/es unknown
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5798659A (en) | 1982-06-18 |
| MX156202A (es) | 1988-07-25 |
| EP0050969A1 (en) | 1982-05-05 |
| ES506504A0 (es) | 1982-11-01 |
| BR8106856A (pt) | 1982-07-06 |
| IN153975B (en:Method) | 1984-09-08 |
| ES8300872A1 (es) | 1982-11-01 |
| CA1193891A (en) | 1985-09-24 |
| DE3164598D1 (en) | 1984-08-09 |
| JPS6123841B2 (en:Method) | 1986-06-07 |
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