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Alloy PK33

A nickel-chromium-cobalt precipitation-hardenable grade, PK33 is highly resistant to thermal shock and fatigue.

With the addition of molybdenum, Alloy PK33 has an exceptional combination of high temperature strength, creep-resistant and ductility.


Product form Size range from Size range to
Alloy PK33 round bar 25 mm 110 mm
Alloy PK33 sheet & plate 0.91 mm 3.25 mm

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    Sheet & Plate

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    Round Bar

Chemical Analysis

% Ni Cr Co Mo Al Ti Fe Si Mn Cu C Zr S
Min - 16 12 5 1.70 1.50 - - - - - - -
Max 54 20 16 9 2.50 3 1 0.50 0.50 0.20 0.070 0.060 0.0050


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Alloy PK33 can be used in a variety of applications including:

  • Gas turbine welded structures
  • Gas turbine hot sections
  • Flame tubes
  • Enclosures for industrial furnace hot sections
  • Combustion chambers

About Alloy PK33

Alloy PK33 is a superalloy which is highly resistant to thermal shock and thermal fatigue. It also offers superb weldability, meaning it is often used to combustion chambers, jet pipes and reheat systems for high performance gas turbine engines.

Alloy PK33 sheet fabrications are normally out into service after completion of the two-stage heat treatment process. This heat treatment is usually carried out in air.

Alloy PK33 is often used in high strength applications at elevated temperatures, such as in gas turbine hot sections or enclosures for industrial furnace hot sections.




8.21 g/cm³
Melting Range:
1300 - 1345°C
Specific Heat Capacity:
419 J/kg.°C
Electrical Resistivity:
1.26 µΩ.m


MSRR 7166, 7195
Download the Alloy PK33 Data Sheet Download

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