Controlled Expansion Alloys

NAS 42-6

An alloy of 42 Ni-6 Cr-Fe, NAS 42-6 is used as a sealing material. Nippon Yakin supplies this product in coil and sheet forms.

Designation / Standard

Nippon Yakin Grade	ASTM F31	EN	JIS
NAS 42-6	UNS K94760	―	―

	C	Si	Mn	P	S	Ni	Cr	Fe
Min	―	―	―	―	―	41.00	5.60	―
Max	0.020	0.30	0.25	0.025	0.025	43.00	6.40	Balance

Specific heat (J/kg･K)		139.8
Specific resistivity (μΩ･cm)	20℃	95
Thermal conductivity (W/m･K)		12.8
Coefficient of thermal expansion (10^-7/℃)	30–400℃	99
Young's modulus (MPa)		158,900
Curie point (℃)		265

NAS 42-6 has a coefficient of thermal expansion similar to that of soft glass.

The excellent pressing and etching characteristics make NAS 42-6 ideal for use in grids and spacer frames for fluorescent display tubes.

Its composition makes it easy to form an oxide film for sealing.