Ni SPAN C 902, N09902, Nickel Alloy Strip

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Ni SPAN C 902, N09902, Nickel Alloy Strip

Ni SPAN C 902 is a heat treatable Nickel-Iron Alloy used in critical diaphragm applications, such as, metal diaphragms for aerospace sensors and burst discs. The alloy composition provides a unique constant elastic modulus value over a temperature range of -50ºF to 150ºF.

Ni SPAN C 902 can be readily formed from the annealed temper. It has a work hardening rate similar to austenitic stainless steel. The material can be joined by TIG, EB, and resistance welding as well as by brazing and soft solder technique.

The heat treatment of Ni SPAN C 902 can be adjusted to produce the desired value for the thermoelastic coefficient at or near zero. The elevated strength in the heat treated temper results in low mechanical hysteresis and low drift.

Available Sizes:

Ni SPAN C 902 is available as strip product in thickness from 0.0005” to 0.040” (0.0127 mm to 1.016 mm) and widths up to 8.0” (203.2 mm). The material conforms to ASM 5221 and UNS N09902.

Nominal Composition

Ni SPAN C 902 NOMINAL COMPOSITION
Nickel	42%
Chromium	5.3%
Titanium	2.4%
Aluminum	0.55%
Silicon	0.50%
Manganese	0.40%
Carbon	0.02%
Iron	Balance

Mechanical Properties

Ni SPAN C 902 MECHANICAL PROPERTIES
	ANNEALED	ANNEAL/HEAT TREAT 1250°F / 3½ HRS	50% COLD ROLLED	50% C.R./HEAT TREAT 1200°F / 2½ HRS
Ultimate Tensile Strength	95,000 PSI	170,000 PSI	140,000 PSI	200,000 PSI
Yield Strength (0.2% Offset)	40,000 PSI	110,000 PSI	130,000 PSI	180,000 PSI
Elongation in 2” *	35%	18%	6%	7%
Proportional Limit	15,000 PSI	65,000 PSI	55,000 PSI	110,000 PSI
Rockwell Hardness	B75	RC33	RC29	RC42
Tensile Modulus of Elasticity	25 x 106 PSI	26 x 106 PSI	25.5 x 106 PSI	28 x 106 PSI
Poisson’s Ratio	0.33	–	–	–

The measured elongation will be less as thickness decreases to 0.004” and less.

Physical Properties

Ni SPAN C 902 PHYSICAL PROPERTIES
Density (Heat Treated)	0.294 lbs/cu.in.
Melting Point (Approx.)	1455° C
Electrical Resistivity	102 Microhm·cm
Thermal Expansion Coefficient (-45°C to 65°C)	8.1 x 10-6/°C
Thermal Conductivity @ R.T.	13.0W/m·K
Curie Temperature (Heat Treated)	193°C Approx.
Magnetic Attraction	Yes