SAE-AISI 5120 (SCr420, G51200) Chromium Steel
Alloy Steels
Property Overview
Density7.8g/cm³
Elastic Modulus190GPa
Tensile Strength500MPa
Yield Strength320MPa
Brinell Hardness150HB
Maximum Service Temperature420°C
Chemical Composition
C
0.17 to 0.22%
CR
0.7 to 0.9%
MN
0.7 to 0.9%
SI
0.15 to 0.35%
P
0 to 0.035%
S
0 to 0.040%
FE
97.6 to 98.3%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Elongation at Break
16 %
Fatigue Strength
210 MPa
Poisson's Ratio
0.29
Shear Modulus
73 GPa
Shear Strength
310 MPa
Tensile Strength: Ultimate (UTS)
500 MPa
Tensile Strength: Yield (Proof)
320 MPa
Hardness
Brinell Hardness
150
Physical
Density
7.8 g/cm 3
Thermal
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
420 °C
Melting Completion (Liquidus)
1460 °C
Melting Onset (Solidus)
1420 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
47 W/m-K
Thermal Diffusivity
13 mm 2 /s
Thermal Expansion
12 µm/m-K
Thermal Shock Resistance
16 points
Electrical
Electrical Conductivity: Equal Volume
7.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.2 % IACS
Calculated
Resilience: Ultimate (Unit Rupture Work)
71 MJ/m 3
Resilience: Unit (Modulus of Resilience)
280 kJ/m 3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
18 points
Strength to Weight: Bending
18 points
Environmental
Base Metal Price
2.1 % relative
Embodied Carbon
1.4 kg CO 2 /kg material
Embodied Energy
19 MJ/kg
Embodied Energy
19 MJ/kg 8.2 x 10 3 BTU/lb
Embodied Water
49 L/kg
Embodied Water
49 L/kg 5.9 gal/lb
Registered Designations & Aliases
G51200SAE-AISI 5120 (SCr420, G51200) Chromium SteelSCr420
Standards
ASTM A322 ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades
ASTM A752 ASTM A752: Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Alloy Steel
ASTM A752 ASTM A752: Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Alloy Steel ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades