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Nickel Chromium Alloys

Alloy 600 and 601 have particular advantages in extreme temperature environments.

Nickel Chromium Alloy

Alloy 600 is popular engineering material for applications where resistance to both heat and corrosion is required. 

The excellent mechanical properties of the alloy give this material high strength and good workability. Corrosion resistance is good, especially in alkaline environments, and can be used in both cryogenic and elevated temperature service. 

Corrosion Resistance:

Alloy 600 is resistant to a wide range of corrosives. 

The alloy provides excellent resistance to alkaline solutions and fair resistance to strongly oxidised acid solutions. It is particularly resistance to attack by dry chlorine or hydrogen chloride, even at temperatures up to 650°C. 

Typical Applications:

  • Heat exchangers
  • Furnaces
  • Exhaust liners for aircraft
  • Nuclear reactor components
  • Production of caustic alkalis
  • Chemical and food processing equipment
  • Condensers
  • Evaporator tubes

Advantages

  • For use in applications from cryogenic to elevated temperatures in the range of 1093 °C
  • Good corrosion resistance
  • Excellent toughness at sub-zero temperatures
  • Good workability combined with high strength

Welding

Can be joined by standard resistance and fusion welding processes used for stainless steels.

Hardening

Alloy 600 is not hardenable by heat treatment

Chemical Composition

  Min % Max %
Nickel 72.00  
Chromium 14.00 17.0
Iron 6.00  10.0
Carbon   0.15
Manganese   1.00
Silicon   0.50
Copper   0.50
Sulphur   0.015

Mechanical Properties

Typical Tensile Strength  550 MPa
Typical Yield Strength  240 M Pa
Typical Elongation  30%

Nickel Chromium Alloy

Alloy 601 is a nickel chromium alloy used in high temperature service. 

The alloy which also includes aluminium develops a tightly adherent oxide scale which resists spalling even under thermal cycling. Alloy 601 offers good hot corrosion resistance under oxidising conditions and combines good creep and rupture strength. 

Key Features:

Alloy 601 nickel alloy is an excellent high temperature material which includes high chromium content. The alloy has excellent resistance to high temperature oxidation. With good ductility retention after long service exposure, the material also offers good creep and rupture strength. 

Typical Applications:

  • Radiant tubes
  • Industrial furnace retorts
  • Annealing tubes
  • Rotary kilns
  • Infrared radiant screens
  • Flame shields
  • Thermal processing equipment
  • Jet engine igniters

Advantages

  • Excellent high temperature material
  • High chromium content
  • Excellent resistance to high temperature oxidation
  • Good ductility retention after long service exposure
  • Good creep and rupture strength

Welding

Readily weldable. Preheat or post weld heat treatment are not required.

Hardening

The work hardened layer makes machining of the material fairly difficult.

Chemical Composition

  Min % Max %
Nickel 58.00 63.00
Chromium 21.00 25.00
Aluminium 1.00 1.70
Carbon   0.10
Manganese   1.00
Copper   1.00
Silicon   0.50
Sulphur   0.015
Iron Balance

Mechanical Properties

  70 1000 1200 1400 1600
Ultimate Tensile Strength ksi 100 90 60 34 18
2% Yield Strength ksi  54 48 41 26 15
Elongation %  45 44 45 70 120

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