SMO 254 Pipe Fittings & Flanges

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Chemical Composition of SS Buttweld Fittings

SMO 254 Ni C Mo Mn Si Fe Cu S P Cr
17.5 – 18.5 0.02 max 6 – 6.5 1 max 0.8 max – 0.5 – 1 0.01 max 0.03 max 19.5 – 20.5
Chemical Composition of SS Forged Fittings
Grade Ni Cr Mo Cu N C Mn Si P S
SMO 254 17.5-18.5 19.5-20.5 6-6.5 0.5-1 0.18-0.22 0.02 1 .08 0.03 0.01
Chemical Composition of SS Flanges
Grade C Mn Si Cu S P Mo Ni Cr
SMO 254 0.02 1 0.08 0.5-1.0 0.01 0.03 6.0-6.5 17.5-18.5 19.5-20.5
Mechanical Properties of SS Butt weld Pipe Fittings

Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
8.0 g/cm3 1320-1390 ℃ 300 650 35 %
Mechanical Properties of SS Forged Fittings
Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.0 g/cm3 1320-1390 ℃ 650 300 35 %
Mechanical Properties of SS Flanges
Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8 g/cm3 1320-1390 ℃ 650 300 35 %
Equivalent Grades of Flanges
STANDARD UNS WERKSTOFF NR. AFNOR EN JIS SIS GOST
SMO 254 S31254 1.4547 Z1 CNDU 20.18.06Az X1CrNiMoCuN20-18-7 – 2378 –
Equivalent Grades of Forge Fitting
STANDARD WERKSTOFF NR. UNS SIS AFNOR EN
SMO 254 1.4547 S31254 2378 Z1 CNDU 20.18.06Az X1CrNiMoCuN20-18-7
Equivalent Grades of Buttweld Fitting
STANDARD WERKSTOFF NR. UNS SIS BS GOST AFNOR EN
SMO 254 1.4547 S31254 2378 – – Z1 CNDU 20.18.06Az X1CrNiMoCuN20-18-7

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