DATA SHEET
Re-Steel’s alloy has been used for applications
where dimensional changes due to temperature
variation must be minimized. This product has been
specifically manufactured for fabricating composite
tooling. Our Invar is produced in accordance to the
Boeing D33028 and ASTM F1684 specifications. This
chemistry limits the sulfur and phosphorus contents
for better weldability.
Comparative Expansion Curves – Invar vs. Carbon Steel
Heat to 1450°F (790°C) and hold at heat 30 minutes per inch of thickness, then air cool. Heating to temperatures
above1000°F (536°C) relieves the presence of cold work stresses. The higher the temperature, the lower the
annealed hardness, as shown in the following table. (Specimen held 5 minutes at heat):
The presence of cold work stresses causes very slight changes in dimensional stability with respect to time and
temperature. This change can be detected only with exceedingly sensitive devices. To assure optimal dimensional
stability, heat to 1500°F (815°C), hold at heat for 30 minutes per inch of thickness, water quench, reheat to 600°F
(315°C) holding one hour at heat, then air cool. To promote a temporal stability (when necessary), Invar has been
aged for 24 to 48 hours at 200°F (63°C).
tolerance on all lengths and widths.
Tube Lengths of 10 to 20 feet
0.25” x 4” x 4”, 0.125” x 4” x 4”, 0.125” x 2” x 2”
Bar Lengths up to 20 feet
Re-Steel can cut bar from their plate inventory.
Pipe LENGTHS OF 10 FEET AND 20 FEET
4” round x 0.125” and 2” round by 0.125”
Invar 36 Weld Wire 0.045” x 30b spools
0.093” x 36” TIG/ROD in 10lb boxes
