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SAE-AISI 4621 Steel vs. SAE-AISI 1038 Steel

Both SAE-AISI 4621 steel and SAE-AISI 1038 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4621 steel and the bottom bar is SAE-AISI 1038 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
170 to 180
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 27
14 to 20
Fatigue Strength, MPa 270
220 to 350
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 320
370 to 390
Tensile Strength: Ultimate (UTS), MPa 500
590 to 640
Tensile Strength: Yield (Proof), MPa 360
320 to 540

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
51
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 3.3
1.8
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
1.4
Embodied Energy, MJ/kg 22
18
Embodied Water, L/kg 50
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
83 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 340
270 to 790
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
21 to 23
Strength to Weight: Bending, points 18
20 to 21
Thermal Diffusivity, mm2/s 12
14
Thermal Shock Resistance, points 15
19 to 20

Alloy Composition

Carbon (C), % 0.18 to 0.23
0.35 to 0.42
Iron (Fe), % 96.1 to 97.1
98.6 to 99.05
Manganese (Mn), % 0.7 to 0.9
0.6 to 0.9
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0 to 0.050