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SAE-AISI 4621 Steel vs. ASTM A202 Steel

Both SAE-AISI 4621 steel and ASTM A202 steel are iron alloys.

For each property being compared, the top bar is SAE-AISI 4621 steel and the bottom bar is ASTM A202 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
180 to 200
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 27
17 to 18
Fatigue Strength, MPa 270
240
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 320
360 to 410
Tensile Strength: Ultimate (UTS), MPa 500
590 to 670
Tensile Strength: Yield (Proof), MPa 360
350 to 360

Thermal Properties

Latent Heat of Fusion, J/g 250
260
Maximum Temperature: Mechanical, °C 410
410
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 46
52
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 3.3
2.1
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
1.4
Embodied Energy, MJ/kg 22
19
Embodied Water, L/kg 50
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
93 to 96
Resilience: Unit (Modulus of Resilience), kJ/m3 340
330 to 350
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 18
21 to 24
Strength to Weight: Bending, points 18
20 to 22
Thermal Diffusivity, mm2/s 12
14
Thermal Shock Resistance, points 15
17 to 20