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Heatseal 29
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Heatseal 29

Available in any of the 'profile options'

A Nickel-Iron-Cobalt alloy having a controlled expansion coefficient. Its expansion with temperature rise is less than that of 80/20 NiCr.

CHEMICAL COMPOSITION SPECIFICATIONS DESIGNATIONS KEY FEATURES TYPICAL APPLICATIONS
Element Min % Max %
Fe 53.00 nominal
Ni 29.00 nominal
Co 17.00 nominal
Mn 0.50
Si 0.20
C 0.04
Al 0.10
Mg 0.10
Zr 0.10
Ti 0.10
Cu 0.20
Cr 0.20
Mo 0.20
AWS 094 Having low expansion as it’s temperature increases makes it an ideal heating element wire for heat sealing (plastic bag welding) over a long straight length. Heat sealing (plastic bag welding) long lengths of plastic bags where low expansion of the wire is important to ensure straightness of the weld. Examples include heat sealing plastic bags for bed mattress’s.
Density 8.16 g/cm³ 0.295 lb/in³
Melting Point 1450°C 2640°F
Inflection Point 450°C 840°F
Thermal Conductivity 16.7 W/m•°C 116 btu•in/ft2•h°F
Coefficient of Expansion 6.0 µm/m °C (20 – 100°C)
4.6 – 5.2 µm/m °C (20 – 400°C)
3.3 x 10-6 in/in °F (70 – 212°F)
2.6 – 2.9 x 10-6 in/in °F (70 – 752°F)
HEAT TREATMENT OF FINISHED PARTS
THE ALLOY IS USUALLY SUPPLIED AND USED IN THE ANNEALED CONDITION (RESIDUAL COLD WORK DISTORTS THE COEFFICIENTS OF THERMAL EXPANSION).
ANNEALING TIMES MAY VARY DUE TO SECTION THICKNESS.
OXIDIZING TIME AND TEMPERATURE TO BE SELECTED DEPENDING ON REQUIRED OXIDE THICKNESS.
Type Temperature Time (Hr) Cooling
°C °F
Anneal 850 – 1000 1560 – 1830 0.5 Air or water
To prepare for glass to metal sealing Decarburization 900 – 1050 1650 – 1920 1 Air or water
If a metal oxide interface is required
(time and temperature depend on required oxide thickness)
Oxidize 600 – 1000 1110 – 1830 1 Air
PROPERTIES
Condition Approx. tensile strength Approx. operating temperature
N/mm² ksi °C °F
Annealed 450 – 550 65 – 80 up to +400 up to +750
Hard Drawn 700 – 900 102 – 131 up to +400 up to +750

The above tensile strength ranges are typical. If you require different please ask.

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