Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
  • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
  • H01L2924/0001—Technical content checked by a classifier
  • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

• the invention relates to an iron-nickel alloy having a low thermal expansion coefficient and special mechanical properties.
• iron-based alloys having approximately 36% nickel exhibit low thermal expansion coefficients in the temperature range between 20 and 100° C. These alloys have therefore been used for several decades wherever constant lengths are required, even with changes in temperature, such as for instance in precision instruments, clocks, bimetals, and shadow masks for color televisions and computer monitors.
• KR 100261678 B1 is an invar alloy wire and a method for producing it.
• the invar alloy has the following composition (in mass %): 33 to 38% nickel, 0.5 to 1.0% cobalt, 0.01 to 1.3% niobium, 0.5 to 4% molybdenum, 0.2 to 1.5% chromium, 0.05 to 0.35% carbon, 0.1 to 1.2% silicon, 0.1 to 0.9% manganese, max. 0.1% magnesium, max. 0.1% titanium, the remainder being iron; the sum of Mo+Cr being between 1.2 and 5.0%, and the sum of niobium and carbon being between 0.1 and 0.6%.
• KR 1020000042608 discloses a high-strength invar alloy wire and a method for producing it.
• the alloy used contains (in mass %): no more than 0.1% nitrogen, 0.01 to 0.2% niobium, 0.3 to 0.4% carbon, 33 to 38% nickel, 0.5 to 4% molybdenum, 0.2 to 1.5% chromium, 0.1 to 1.2% silicon, 0.1 to 0.9% manganese, 1.0 to 10% cobalt, and, as needed, additions of up to 0.1% each Al, Mg, and Ti, with the remainder being iron.
• the object of the inventive subject-matter is to provide a creep-resistant iron-nickel alloy having a low thermal expansion coefficient and special mechanical properties. Moreover, a production process for wire-like components made of this alloy is provided. Finally, it should be possible to employ the material for specific uses, and the alloy should have a low thermal expansion coefficient.
• One preferred variant of the inventive iron-nickel alloy is provided as follows (in mass %):
• Another variant is formed by (in mass %):
• the inventive composition of the alloy is distinguished from the prior art in that the Si and Mn contents are kept as small as possible. It is known that there is a strong relationship between the elements silicon and manganese with respect to the thermal expansion coefficient. On the other hand, these elements are metallurgically necessary in order to ensure adequate processability. This relates in particular to hot shaping to create billets and wire rods.
• the inventive chemical composition it is possible to use the smallest possible amounts of the elements silicon and manganese, so that the negative effects these elements have on the thermal expansion coefficient can be avoided.
• the alloy is easy to process. For this reason, the sum of Mn+Si should not exceed 0.2% (in mass %). The sum of Mn+Si should be ⁇ 0.1%, where technically feasible.
• the inventive alloy has a nickel content between 35 and 38 mass %, a chromium content of >0.6 to ⁇ 1.2 mass %, a molybdenum content between 2.1 and 2.8 mass %, an aluminum content between 0.2 and 0.4 mass %, and a tungsten content of >0.25 to ⁇ 1.0 mass %.
• the element zirconium may also be added in contents >0 to ⁇ 0.2 mass % and/or the element B may be added in contents >0 ⁇ 0.01 mass % of the inventive alloy. B+Zr individually or together improve the hot formability of the alloy.
• the element W may be substituted for some of the element Mo.
• the W:Cr:Mo ratio should be approximately 1:2:5.
• the portion of the aforesaid elements in the inventive alloy must be provided such that the predetermined target value of thermal expansion coefficient is not exceeded.
• the inventive alloy has a thermal expansion coefficient of ⁇ 4 ⁇ 10 ⁇ 6 /K, especially ⁇ 3.5 ⁇ 10 ⁇ 6 /K.
• the wire rod diameter must be adjusted such that adequate cold forming can be performed prior to and after intermediate annealing, which may take place in multiple stages.
• the inventive alloy may be used as wire for power lines, especially as the core wire for power lines.
• inventive alloy may be present in the form of sheet, bar, strip, or wire material.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Heat Treatment Of Steel (AREA)
• Soft Magnetic Materials (AREA)
• Continuous Casting (AREA)
• Heat Treatment Of Sheet Steel (AREA)
• Lead Frames For Integrated Circuits (AREA)
• Insulated Conductors (AREA)

Applications Claiming Priority (5)

Publications (1)

Family

ID=41110501

Family Applications (1)

Country Status (9)

Cited By (10)

Families Citing this family (9)

Citations (5)

Family Cites Families (8)

• 2009
  • 2009-04-29 EP EP09741742A patent/EP2279274B1/fr active Active
  • 2009-04-29 US US12/991,558 patent/US20110056589A1/en not_active Abandoned
  • 2009-04-29 CA CA2725206A patent/CA2725206C/fr active Active
  • 2009-04-29 WO PCT/DE2009/000610 patent/WO2009135469A1/fr active Application Filing
  • 2009-04-29 ES ES09741742T patent/ES2379579T3/es active Active
  • 2009-04-29 CN CN2009801092629A patent/CN101978086B/zh active Active
  • 2009-04-29 KR KR1020107023190A patent/KR20110009657A/ko active Search and Examination
  • 2009-04-29 AT AT09741742T patent/ATE544876T1/de active
  • 2009-04-29 JP JP2011507788A patent/JP5546531B2/ja active Active

Patent Citations (6)

Non-Patent Citations (1)

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