SMO 254 / UNS N31254 / SMO WNR 1.4547

SMO 254 or UNS N31254 is a combination of nickel-molyoaenum-chromium with slight addition of tungsten making it exceptionally corrosion resistant in different atmospheres. It possess great workability giving high strength. Owing to its higher resistence ability to pitting and crevice erosion it is a recommended use in Chemical industry & food processing equipment, Trucks & trailer body manufacturing purposes.

Standard availability in product form ranges from sheet, plate, wire, tube, forging stock, round and pipe. SMO 254 contains low carbon content which helps reduce carbide precipitation while welding and enhances the corrosion resistance in the soldered structures. Has advanced strength than the conservative austenitic stainless steel.

Element	Percentage
C	≤0.020
Si	0.080
Mn	1.00
P	0.030
S	0.010
Ni	18.00
Cr	20.00
Mo	6.1
Cu	0.7
N	0.20

UNS S31254		Sheet and strip
0.2% proof stress [MPa		≥310
Tensile strength [MPa]		≥690
Elongation [%]		≥35
Hardness	[Hv]	–
	[HB]	≤223

Density [g/cm3 ]		8.02
Specific heat [J/kg . K] 20°C		464
Electrical resistivity [μΩ . cm]		88.2
Thermal conductivity [W/m . K]		12.3
Average coefficient of thermal expansion [10-6 /°C]	20~200°C	15.6
	20~300°C	16.1
	20~400°C	16.8
Young’s modulus [MPa]		16.7 × 10^4
Magnetism		None
Melting range [°C]		1360~1405