US3719475A - Low carbon ferrous alloy containing chromium - Google Patents

Low carbon ferrous alloy containing chromium Download PDF

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Publication number
US3719475A
US3719475A US00011344A US3719475DA US3719475A US 3719475 A US3719475 A US 3719475A US 00011344 A US00011344 A US 00011344A US 3719475D A US3719475D A US 3719475DA US 3719475 A US3719475 A US 3719475A
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US
United States
Prior art keywords
alloy
alloy containing
low carbon
containing chromium
ferrous alloy
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 - Lifetime
Application number
US00011344A
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English (en)
Inventor
L Habraken
V Leroy
M Meulemans
F Carteels
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.)
Centre de Recherches Metallurgiques CRM ASBL
Centre dEtude de lEnergie Nucleaire CEN
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
Centre dEtude de lEnergie Nucleaire CEN
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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium

Definitions

  • the invention concerns metal alloys, and more particularly metal alloys intended for use with the high temperatures, for instance approximately 700 C., to which materials are subjected when used as a protection sheath for nuclear fuel used in fast neutron nuclear reactors.
  • Certain austenitic stainless steels have properties which make them suitable for use in making protection sheaths for nuclear fuel used in nuclear reactors of the thermal type.
  • the crystal structure of these steels i.e. the faced centred cubic system, contributes to their high mechanical properties.
  • a metallic alloy would be desirable which, while conserving good resistance to corrosion and excellent mechanical properties, these being the result of a hardening of solid solution and precipitation hardening, has distinctly less sensitivity to fragile breaking.
  • the metallic alloy forming the subject of the invention contains, by weight:
  • the above alloys may be prepared in a normal crucible (fritted magnesia) in accordance with the customary method, cast, and cooled, preferably under vacuum or under an inert or neutral atmosphere. No particular problem is posed by their method of preparation.
  • the invention also aims at producing a method of treatment which, applied to the above-mentioned alloys, makes it possible to improve the properties still further.
  • these alloys are subjected to at least one operation comprising heating to a temperature which is sufiicient (most frequently 1,000 C.) to put in solution all the solid precipitates which may be present, the heating being followed, preferably at temperature which is as near as possible to the heating temperature, by between 20% and 60% hot working, this thermomechanical treatment leading to a fresh distribution of the hardening precipitation.
  • the concentration ranges in the basic Fe-Cr-Ti alloy are chosen for the following resaons. If the Ti content is below 2% there is insufficient precipitation hardening, whereas if the content is above 7%, the elongation at fracture is below 8%. A Cr content below 13% gives insufficient resistance to oxidation, whereas at concentrations above 25%, brittleness occurs, due to the appearance of the delta phase, at 500700 C.
  • the optimal additional elements improve the basic alloy by increasing the mechanical strength at service tem peratures due to intermetallic precipitates, refining the structure when submitted to thermo-mechanical treatment, and allowing easier forming of the alloy.
  • EXAMPLE 1 A ferritic alloy, having the composition 13% Cr, 5% Ti, balance Fe, was extruded at 1050" C. The following properties were obtained at 700 C.:
  • EXAMPLE 2 A ferritic alloy, having the composition given below: 13% Cr, 5% Ti, 2% V, 0.2% A1, 0.1% Ce, balance Fe, was prepared, cast, cooled and then aged for three days at a temperature of 700 C. It then had the following mechanical properties measured at 700 C. at a traction speed of 0.5 per min.:
  • At least one rare earth metal from zero to 0.5% per rare earth metal; the balance being iron and incidental impurities.

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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)
  • Hard Magnetic Materials (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Heat Treatment Of Articles (AREA)
US00011344A 1969-02-14 1970-02-13 Low carbon ferrous alloy containing chromium Expired - Lifetime US3719475A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU58006 1969-02-14

Publications (1)

Publication Number Publication Date
US3719475A true US3719475A (en) 1973-03-06

Family

ID=19725940

Family Applications (1)

Application Number Title Priority Date Filing Date
US00011344A Expired - Lifetime US3719475A (en) 1969-02-14 1970-02-13 Low carbon ferrous alloy containing chromium

Country Status (8)

Country Link
US (1) US3719475A (en))
JP (1) JPS4811449B1 (en))
BE (1) BE745720A (en))
FR (1) FR2037088A1 (en))
GB (1) GB1253006A (en))
LU (1) LU58006A1 (en))
NL (1) NL163568C (en))
SE (1) SE348501B (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244754A (en) * 1975-07-05 1981-01-13 The Foundation: The Research Institute Of Electric And Magnetic Alloys Process for producing high damping capacity alloy and product
US4296178A (en) * 1979-05-18 1981-10-20 Varian Associates, Inc. Article comprising a substrate and chromium alloy coating

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2535441B1 (fr) * 1982-10-29 1988-05-27 Europ Equip Menager Appareil a enceinte de cuisson

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244754A (en) * 1975-07-05 1981-01-13 The Foundation: The Research Institute Of Electric And Magnetic Alloys Process for producing high damping capacity alloy and product
US4296178A (en) * 1979-05-18 1981-10-20 Varian Associates, Inc. Article comprising a substrate and chromium alloy coating

Also Published As

Publication number Publication date
LU58006A1 (en)) 1970-09-08
SE348501B (en)) 1972-09-04
DE2005696A1 (de) 1971-01-21
BE745720A (en)) 1970-08-10
NL163568B (nl) 1980-04-15
GB1253006A (en)) 1971-11-10
NL163568C (nl) 1980-09-15
NL7001816A (en)) 1970-08-18
DE2005696B2 (de) 1972-01-20
JPS4811449B1 (en)) 1973-04-13
FR2037088A1 (en)) 1970-12-31

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