ACI/CAST
GRADE		 CAST ASTM CAST EN/DIN CAST UNS WROUGHT
UNS		 WROUGHT
GRADE
CK3MCuN A351 – J93254 S31254 254 SMO®, F44
CHEMICAL COMPOSITION (wt%, TYPICAL VALUES)
C Cr Ni Mo Other PREn
<0.025 20.0 18.0 6.3 0.7Cu, 0.2N >40
CASTINGS MINIMUM MECHANICAL PROPERTIES (AT 20°C, UNLESS OTHERWISE SPECIFIED)
Rp0.2[MPa] Rm [MPa] A % Hardness [HB] Impact [J]
260 550 35 150-210 120
PHYSICAL PROPERTIES (AT 20°C, UNLESS OTHERWISE SPECIFIED)
Microstructure ρ [kg/dm3] α [μm/m∙K] (20 – 100 °C) K [W/m∙K] Cp [J/kg∙K] Melting ΔT [°C]
Austenitic 8.0 16.5 12.4 440 1306-1386
WORKING CONDITIONS / FABRICATION
Heat Treatment Weldability Machinability [100 = CF8M] Patternmaker’s Shrinkage [%]
Solution Annealing Excellent – 2.6
Categoria: Superaustenitic
ACI/CAST
GRADE		 CK3MCuN
CAST ASTM A351
CAST EN/DIN –
CAST UNS J93254
WROUGHT
UNS		 S31254
WROUGHT
GRADE		 254 SMO®, F44
CHEMICAL COMPOSITION (wt%, TYPICAL VALUES)
C <0.025
Cr 20.0
Ni 18.0
Mo 6.3
Other 0.7Cu, 0.2N
PREn >40
CASTINGS MINIMUM MECHANICAL PROPERTIES (AT 20°C, UNLESS OTHERWISE SPECIFIED)
Rp0.2[MPa] 260
Rm [MPa] 550
A % 35
Hardness [HB] 150-210
Impact [J] 120
PHYSICAL PROPERTIES (AT 20°C, UNLESS OTHERWISE SPECIFIED)
Microstructure Austenitic
ρ [kg/dm3] 8.0
α [μm/m∙K] (20 – 100 °C) 16.5
K [W/m∙K] 12.4
Cp [J/kg∙K] 440
Melting ΔT [°C] 1306-1386
WORKING CONDITIONS / FABRICATION
Heat Treatment Solution Annealing
Weldability Excellent
Machining –
Patternmaker’s Shrinkage [%] 2.6

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