DAIKOWT 36 INV

GTAW
  • NICKEL ALLOYS
INVAR

Description

Solid rod for low thermal expansion alloys
Consumable designed to have very low thermal expansion providing freedom to solidification and reheat cracking. The weld metal is a nickel-iron low-expansion alloy containing 36% nickel. It maintains nearly constant dimensions over the range of normal atmospheric temperatures, and has a low coefficient of expansion from cryogenic temperatures to about 260°C. It also retains good strength and toughness at cryogenic temperatures and is used for tanks and piping for storing and transporting liquefied gases.
Specifications
Shielding
I1
Positions
PA, PB, PC, PD, PE, PF
Current
DC-
Packaging Type
5kg carton tube
Chem. Comp. %
DEFAULT
C
0.23
Mn
0.53
Ni
36
Nb
1.3
Al
0.1
P
0.003
S
0.001
Si
0.35
Cu
0.05
Fe
61.1
Ti
0.3
Mechanical Properties
min
variant
Tensile strength Rm MPa
-
450
Yield strength Rp0.2 MPa
-
290
Elongation A (L0=5d0) %
-
42
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
Welding Parameters
1.6 mm
2.4 mm
Ampere
80A - 120A
130A - 160A
Voltage
10V - 13V
14V - 18V
Packaging
Ø 1,0÷4,0mm
Ø 1,0÷4,0mm
Packaging Type
5kg carton tube
5kg carton tube
Description

Application

Invar®, also known generically as FeNi36 (64FeNi in the US), is an iron-nickel alloy renowned for its remarkably low coefficient of thermal expansion across a broad temperature range. It exhibits a thermal expansion rate roughly one-tenth that of carbon steel up to 200°C. With 36% nickel content, this alloy maintains consistent dimensions from normal atmospheric temperatures to approximately 260°C, demonstrating a low coefficient of expansion even in cryogenic conditions as low as -100°C. Moreover, it retains robust strength and toughness in cryogenic conditions. Its versatility extends to various applications, including the construction of tanks and piping for storing and transporting liquefied gases. Additionally, it finds utility in molds for composite components, piezoelectric injectors, echoboxes, and filters for mobile telephone relay stations. Specially crafted consumables complement this alloy's exceptionally low thermal expansion, providing the necessary flexibility to address challenges associated with solidification and reheat cracking during welding processes.

Alloy Type

Iron-based alloy with 36 % nickel.

Microstructure

Fe-Ni-based binary alloy, mainly composited of face-centered cubic (fcc) austenite.

Materials

FeNi36 and similar low thermal expansion alloys.
EN W.Nr.: 1.3912 (Ni 36 X 10 Ni 36).
UNS: K93600, K93601.
PROPRIETARY: Nilo® 36 (Special Metals), Invar® 36 (Aperam).

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