Nickel Alloy PK33/ Nimonic PK33

Technical Data Sheet

Chemical Composition Limits
Weight% Ni Cr Mo Fe Al Ti C
PK33 Bal 16-20 5-9 1.0 max 1.7-2.5 1.5-3.0 0.07 max
Weight% Cu Si Mn Co B Zr S
PK33 0.2 max 0.5 max 0.5 max 12.0-16.0 0.005 max 0.06 max 0.015 max

Alloy PK33 is a nickel- chromium - cobalt precipitation hardenable alloy but the addition of Molybdenum makes Alloy PK33 solid-solution strengthened. PK33 is commonly used in gas turbines as flame tubes because of its high temperature strength, creep resistance and welded sheet structures.

Typical Mechanical Properties

Material Condition 20°C 0.1 % Proof Stress MPa Tensile Strength MPa Elongation % Reduction of Area %
PK33 Bar Heat Treatment 2h/1100°C/AC +4h 850°C/AC 664 1127 33 41

PK33 is available in Sheet, Plate, Round Bar, Flat Bar, Forging Stock, Extruded Section and Welding Wire. For all stock availability contact Sales.


At Aircraft Materials we specialise in the rapid turn-around of orders, with most stock items ready for shipping out the same day to anywhere in the world. For time-critical orders, such as AOGs use our AOG service desk (, the team are dedicated to processing and dispatching orders on the same day, even for cutting orders on bar and sheet products.

Our expertise in global logistics enables us to source material from anywhere in the world in a matter of days and provide fast shipping solutions to all our customers, whichever country they are in. We use a range of transport partners to ship overnight within the UK and Europe, and offer a full range of logistics solutions from priority express services to more cost-effective economy shipments all around the globe. To find out more about our services click here.

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.