SUPER INVAR 32-5

Chemistry: Typical Analysis

Carbon: 0.05, Nickel: 31.75, Iron: Balance, Silicon: 0.09, Manganese: 0.39,

Cobalt:5.36, Sulfur: 0. 01, Chromium: 0.03, Aluminum: 0.07, Copper: 0.08

Description

Super Invar 32-5, a magnetic, austenitic, solid solution alloy containing iron, nickel, and cobalt, is designed to provide minimum thermal expansion at room temperatures. This alloy also exhibits austenite stability to service temperature at least -67°F and thermal expansion properties less than those of Invar 36 alloy (36% nickel-iron) when used in the -67/203° F (-55/95°C) temperature range.

Applications

Applications for Super Invar 32-5 have included structural components for supports and substrates in optical and laser systems requiring precision measurements. This alloy has also used in wave guide tubes and other systems requiring metals in conjunction with low expansion glass/quartz assemblies.

Physical Properties

Specific gravity ........................ 8.15

Density

lb/cu in ................................... 0.294

kg/cu m .................................. 8150

Electrical resistivity (RT)

microhm-cm .................................. 80

Mean coefficient of thermal expansion*

10(-6)/°F(-67 to 203 °F) ............. 0.35

10(-6)/°C(-55 to 95°C) ........... 0.63

Modulus of elasticity

x 10(6) psi ................................. 21

x 10(6) MPa ............................. 144

MSTemperature

°F ........................................... -112

°C ............................................ -80

Poisson's ratio ............................ 0.23