A nickel-chromium-tungsten-molybdenum grade, Alloy 230 has outstanding oxidation resistance up to 1149 °C.

Alloy 230 has excellent long-term resistance to oxidation and thermal stability. In addition, the alloy also has good resistance to nitriding and carburising environments.

  • UNS Number: N06230
  • Werkstoff Number: 2.4733
  • ASTM: B435, B564, B572, B619, B622, B626, B366, 5981
  • AMS: 5878

Product availability

Round Bar
Welding Wire

Chemical analysis



  • Transition ducts on turbine engines
  • Combustion linings on turbine engines
  • Furnace retorts
  • Burner flame shrouds
  • Vacuum heat treat fixtures
  • Chains and fixtures
  • Nitriding furnace internals
  • Sparger tubes and recuperative internals

About Alloy 230

Alloy 230 has outstanding oxidation resistance and superior strength up to 1149 °C. Comparable to Alloy 600, Alloy 230 exhibits excellent nitriding and carburising resistance. The alloy is one of the most nitriding-resistant materials available.

Alloy 230 has excellent creep and fatigue resistance combined with long-term stability. In addition the alloy is resistance to grain coarsening when subject to elevated temperatures for prolonged periods.

Alloy 230 is easily fabricated and welded. As a result of its good ductility, Alloy 230 is readily formed by cold working.

  • Density: 8.968 g/cm³
  • Melting range: 1302-1371°C

Mechanical & Physical Properties

Mechanical & Physical Properties21.1°C538°C649°C704°C760°C816°C871°C927°C982°C1093°C
Ultimate Tensile Strength/MPa 841.2703.36668.8-537.8-310.3-172.489.6
0.2% Yield Strength/MPa 420.6303.4303.4-324.1-234.4-124.168.9
Reduction of area ----------
Elongation/% 475457-61-75-5037
Charpy Impact V-notch ----------
Minimum Creep 0.0001% per hr ----------
10,000 hr Rupture Strength(MPa) --186.2127.69157.938.622.17.6-
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