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SAE-AISI 4621 Steel vs. AISI 347 Stainless Steel

Both SAE-AISI 4621 steel and AISI 347 stainless steel are iron alloys. They have 72% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4621 steel and the bottom bar is AISI 347 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
160 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 27
34 to 46
Fatigue Strength, MPa 270
220 to 270
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 320
430 to 460
Tensile Strength: Ultimate (UTS), MPa 500
610 to 690
Tensile Strength: Yield (Proof), MPa 360
240 to 350

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 410
870
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 46
16
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.3
19
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.6
3.6
Embodied Energy, MJ/kg 22
52
Embodied Water, L/kg 50
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
190 to 220
Resilience: Unit (Modulus of Resilience), kJ/m3 340
150 to 310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 18
22 to 25
Strength to Weight: Bending, points 18
20 to 22
Thermal Diffusivity, mm2/s 12
4.3
Thermal Shock Resistance, points 15
13 to 15

Alloy Composition

Carbon (C), % 0.18 to 0.23
0 to 0.080
Chromium (Cr), % 0
17 to 19
Iron (Fe), % 96.1 to 97.1
64.1 to 74
Manganese (Mn), % 0.7 to 0.9
0 to 2.0
Molybdenum (Mo), % 0.2 to 0.3
0
Nickel (Ni), % 1.7 to 2.0
9.0 to 13
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.035
0 to 0.045
Silicon (Si), % 0.15 to 0.35
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030