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SAE-AISI 4621 Steel vs. EN 1.0478 Steel

Both SAE-AISI 4621 steel and EN 1.0478 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI 4621 steel and the bottom bar is EN 1.0478 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
130
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 27
24
Fatigue Strength, MPa 270
170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 320
280
Tensile Strength: Ultimate (UTS), MPa 500
440
Tensile Strength: Yield (Proof), MPa 360
230

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 410
400
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 46
49
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 3.3
2.2
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
1.5
Embodied Energy, MJ/kg 22
20
Embodied Water, L/kg 50
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
90
Resilience: Unit (Modulus of Resilience), kJ/m3 340
150
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
16
Strength to Weight: Bending, points 18
16
Thermal Diffusivity, mm2/s 12
13
Thermal Shock Resistance, points 15
14

Alloy Composition

Aluminum (Al), % 0
0 to 0.060
Carbon (C), % 0.18 to 0.23
0 to 0.18
Chromium (Cr), % 0
0 to 0.3
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 96.1 to 97.1
96.9 to 99.4
Manganese (Mn), % 0.7 to 0.9
0.6 to 1.4
Molybdenum (Mo), % 0.2 to 0.3
0 to 0.080
Nickel (Ni), % 1.7 to 2.0
0 to 0.3
Niobium (Nb), % 0
0 to 0.030
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.035
0 to 0.025
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.015
Vanadium (V), % 0
0 to 0.050