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AISI Type 444

Composition

Element Weight % C  0.03  Mn  1.00  Si  1.00  Cr  17.5-19.5  Ni  1.0  P  0.04  S  0.03  Mo  1.75-2.5  N  0.035 (max)  Ti+Nb  0.44 (min)

Mechanical Properties

Properties		Conditions
		T (°C)	Treatment
Density (×1000 kg/m3)	7.8	25
Poisson's Ratio	0.27-0.30	25
Elastic Modulus (GPa)	200	25
Tensile Strength (Mpa)	415	25	annealed (plate, sheet, strip)
Yield Strength (Mpa)	275
Elongation (%)	20
Reduction in Area (%)
Hardness (HRB)	95 (max)	25	annealed (plate, sheet, strip)

Thermal Properties

Properties		Conditions
		T (°C)	Treatment
Thermal Expansion (10-6/ºC)	10	0-100 more
Thermal Conductivity (W/m-K)	26.8	100
Specific Heat (J/kg-K)	420	0-100

Electric Properties

Properties		Conditions
		T (°C)	Treatment
Electric Resistivity (10-9W-m)	620	25

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