Alloy 20 / SMO 254 / AISI 4130 Technical Information

Chemical Compositions

Alloy 20 Flanges Chemical Composition

Grade C Mn Si S Cu Ni Cr Fe Mo P
Alloy 20 0.07 max 2.00 max 1.00 max 0.035 max 3.0-4.0 32.0-38.0 19.0-21.0 29.85 min* 2.0-3.0 0.045 max

SMO 254 Flanges Chemical Composition

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

AISI 4130 Flanges Chemical Composition

Grade C Mn Si P S Fe Mo Ni Cr
AISI 4130 0.28-0.33 0.40-0.60 0.15-0.35 0.035 max 0.025 MAX 97.3-98.22 0.15-0.25 0.50 max 0.80-1.10

Mechanical Properties

Alloy 20 Flanges Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.1 g/cm3 1443 °C (2430 °F) Psi -80,000, MPa -551 Psi – 35,000, MPa – 241 30%

SMO 254 Flanges Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8 g/cm3 1320-1390 ℃ 650 300 35 %

AISI 4130 Flanges Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
7.85 g/cm3 1432 ℃ 560 460 21.50%

Equivalent Grades

Alloy 20 Flanges Equivalent Grades

STANDARD WERKSTOFF NR. UNS AFNOR EN
Alloy 20 2.4660 N08020 Z2NCUD31-20AZ NiCr20CuMo

SMO 254 Flanges Equivalent Grades

STANDARD WERKSTOFF NR. UNS SIS BS GOST AFNOR EN
SMO 254 1.4547 S31254 2378 – – Z1 CNDU 20.18.06Az X1CrNiMoCuN20-18-7

AISI 4130 Flanges Equivalent Grades

STANDARD WERKSTOFF NR. UNS JIS BS EN
AISI 4130 1.7218 G41300 JIS G4105 BS 970 25CrMo4