EP0050969A1 - Poudre d'acier allié - Google Patents

Poudre d'acier allié Download PDF

Info

Publication number
EP0050969A1
EP0050969A1 EP19810305004 EP81305004A EP0050969A1 EP 0050969 A1 EP0050969 A1 EP 0050969A1 EP 19810305004 EP19810305004 EP 19810305004 EP 81305004 A EP81305004 A EP 81305004A EP 0050969 A1 EP0050969 A1 EP 0050969A1
Authority
EP
European Patent Office
Prior art keywords
powder
alloy
silicon
phosphorus
final product
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.)
Granted
Application number
EP19810305004
Other languages
German (de)
English (en)
Other versions
EP0050969B1 (fr
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Amsted Industries Inc filed Critical Amsted Industries Inc
Publication of EP0050969A1 publication Critical patent/EP0050969A1/fr
Application granted granted Critical
Publication of EP0050969B1 publication Critical patent/EP0050969B1/fr
Expired legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/02Making ferrous alloys by powder metallurgy
    • C22C33/0257Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278Making 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%
    • C22C33/0285Making 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 alloy steel 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 essentially iron.
  • the difference between the solidus and liquidus temperatures is increased to greater than 25°F (14°C) by the addition of the silicon andphosphorus, 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 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 temprature of 2100°F (1150°C) has an elongation of 40% and an unnotched impact strength of greater than 120 ft-lb (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 had 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)
EP19810305004 1980-10-24 1981-10-23 Poudre d'acier allié Expired EP0050969B1 (fr)

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 true EP0050969A1 (fr) 1982-05-05
EP0050969B1 EP0050969B1 (fr) 1984-07-04

Family

ID=22742085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810305004 Expired EP0050969B1 (fr) 1980-10-24 1981-10-23 Poudre d'acier allié

Country Status (8)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100581A1 (fr) * 2001-06-13 2002-12-19 Höganäs Ab Produits en acier inoxydable a densite elevee et procede de preparation correspondant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2012653A1 (fr) * 1968-07-10 1970-03-20 Minnesota Mining & Mfg
FR2183069A1 (fr) * 1972-05-02 1973-12-14 Hoeganaes Ab
FR2382506A1 (fr) * 1977-03-02 1978-09-29 Bosch Gmbh Robert Alliage ferreux, fritte, a haute resistance

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2012653A1 (fr) * 1968-07-10 1970-03-20 Minnesota Mining & Mfg
FR2183069A1 (fr) * 1972-05-02 1973-12-14 Hoeganaes Ab
FR2382506A1 (fr) * 1977-03-02 1978-09-29 Bosch Gmbh Robert Alliage ferreux, fritte, a haute resistance

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100581A1 (fr) * 2001-06-13 2002-12-19 Höganäs Ab Produits en acier inoxydable a densite elevee et procede de preparation correspondant
CN1330444C (zh) * 2001-06-13 2007-08-08 赫加奈斯公司 高密度不锈钢产品及其制备方法
US7311875B2 (en) 2001-06-13 2007-12-25 Höganäs Ab High density stainless steel products and method for the preparation thereof

Also Published As

Publication number Publication date
DE3164598D1 (en) 1984-08-09
CA1193891A (fr) 1985-09-24
ES506504A0 (es) 1982-11-01
JPS5798659A (en) 1982-06-18
MX156202A (es) 1988-07-25
EP0050969B1 (fr) 1984-07-04
JPS6123841B2 (fr) 1986-06-07
ES8300872A1 (es) 1982-11-01
BR8106856A (pt) 1982-07-06
IN153975B (fr) 1984-09-08

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