Invar 42 for Composite Tooling Applications is a low-expansion alloy containing 42% nickel, the balance primarily iron. Re-Steel’s Invar 42 has been specifically manufactured for fabricating composite tooling and is produced in accordance to the ASTM F30 specifications. Additionally, the chemistry limits the sulfur and phosphorus contents for better weldability. Invar 42 is also highly effective in magnetic applications and can be hot and cold formed while not being overly difficult to machine.

STANDARD PLATE SIZES Below is a chart of standard sizes plus or minus 5.0” tolerance on all lengths and widths.

FABRICATED TUBING Lengths of 10 to 20 feet
0.25” x 4” x 4”, 0.125” x 4” x 4”, 0.125” x 2” x 2” SQUARE BAR Lengths up to 20 feet
Re-Steel can cut bar from their plate inventory. ROUND BAR Lengths of 10 to 20 feet
4” round x 0.125” and 2” round by 0.125” INVAR 42 WELD WIRE 0.045” x 30 or 33lb spools
0.093” x 36” TIG/ROD in 10lb boxes

INVAR 42 FOR COMPOSITE TOOLING
DATA SHEET

CHEMISTRY

 

APPLICATION

Re-Steel’s product has been specifically
manufactured for fabricating composite tooling.
Our Invar 42 is produced in accordance to the
ASTM F30 specification. This chemistry limits
the sulfur and phosphorus contents for better
weldability.

HEAT TTEATMENT

Re-Steel’s product has been specifically
manufactured for fabricating composite tooling.
Our Invar 42 is produced in accordance to the
ASTM F30 specification. This chemistry limits
the sulfur and phosphorus contents for better
weldability.

THERMAL EXPANSION PROPERTIES

Annealing

Heat to 1450°F (788°C) and hold at heat for at least
one-half hour per inch of thickness, air cool.

grinding and polishing

A silicon carbide wheel is desirable, preferably a soft
wheel which will wear without loading. For finish
grinding, a satisfactory grade to start with is No. 80
grit.

forging

The forging temperature should be 2150/2200°F
(1177/1204°C). Avoid prolonged soaking to prevent
sulfur absorption from the furnace atmosphere.

weldability

Any of the conventional welding methods can be used.
When filler rod is required, Invar 42 is suggested

We can also do custom plate sizing, please review our additional services or contact us for more information.