EP0050969B1 - Legiertes Stahlpulver - Google Patents

Legiertes Stahlpulver Download PDF

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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
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EP
European Patent Office
Prior art keywords
final product
powder
alloy
alloy powder
powdered metal
Prior art date
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Expired
Application number
EP19810305004
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English (en)
French (fr)
Other versions
EP0050969A1 (de
Inventor
Jean C. Lynn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amsted Industries Inc
Original Assignee
Amsted Industries Inc
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Filing date
Publication date
Application filed by Amsted Industries Inc filed Critical Amsted Industries Inc
Publication of EP0050969A1 publication Critical patent/EP0050969A1/de
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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)

Claims (8)

1. Eisenbasislegierung in Pulverform enthaltend bezogen auf auf das Gewicht:
Figure imgb0013
wobei der Rest, abgesehen von unvermeidbaren Verunreinigungen, Eisen ist.
2. Legierung in Pulverform gemäß Anspruch 1, dadurch gekennzeichnet, daß sie etwa 12 % Nickel enthält.
3. Legierung in Pulverform gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß sie 2 bis 3 % Silicium enthält.
4. Legierung in Pulverform, wie in einem der vorhergehenden Ansprüche beansprucht, dadurch gekennzeichnet, daß sie etwa 3 % Silicium enthält.
5. Legierung in Pulverform, wie in einem der vorhergehenden Ansprüche beansprucht, dadurch gekennzeichnet, daß sie 0,08 bis 0,1 % Phosphor enthält.
6. Legierung in Pulverform, wie in einem der vorhergehenden Ansprüche beansprucht, dadurch gekennzeichnet, daß sie bis zu etwa 0,1 % Kohlenstoff enthält.
7. Legierung in Pulverform, wie in Anspruch 1 beansprucht, mit einer der folgenden Zusammensetzungen bezogen auf das Gewicht:
Figure imgb0014
wobei der Ausgleichsrest in jedem Fall, abgesehen von unvermeidlichen Verunreinigungen, Eisen ist.
8. Produkte, hergestellt durch Kompaktieren und Sintern eines Pulvers, wie in einem der vorhergehenden Anssprüche beansprucht.
EP19810305004 1980-10-24 1981-10-23 Legiertes Stahlpulver Expired EP0050969B1 (de)

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 (de) 1982-05-05
EP0050969B1 true EP0050969B1 (de) 1984-07-04

Family

ID=22742085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810305004 Expired EP0050969B1 (de) 1980-10-24 1981-10-23 Legiertes Stahlpulver

Country Status (8)

Country Link
EP (1) EP0050969B1 (de)
JP (1) JPS5798659A (de)
BR (1) BR8106856A (de)
CA (1) CA1193891A (de)
DE (1) DE3164598D1 (de)
ES (1) ES8300872A1 (de)
IN (1) IN153975B (de)
MX (1) MX156202A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 (de) * 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

Also Published As

Publication number Publication date
ES506504A0 (es) 1982-11-01
ES8300872A1 (es) 1982-11-01
JPS6123841B2 (de) 1986-06-07
BR8106856A (pt) 1982-07-06
EP0050969A1 (de) 1982-05-05
DE3164598D1 (en) 1984-08-09
MX156202A (es) 1988-07-25
JPS5798659A (en) 1982-06-18
CA1193891A (en) 1985-09-24
IN153975B (de) 1984-09-08

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