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SAE-AISI 4340 Steel vs. AISI 347H Stainless Steel

Both SAE-AISI 4340 steel and AISI 347H stainless steel are iron alloys. They have 73% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is AISI 347H stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 360
170
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 12 to 22
39
Fatigue Strength, MPa 330 to 740
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 430 to 770
400
Tensile Strength: Ultimate (UTS), MPa 690 to 1280
580
Tensile Strength: Yield (Proof), MPa 470 to 1150
230

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 430
940
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 44
16
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
19
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.7
3.6
Embodied Energy, MJ/kg 22
52
Embodied Water, L/kg 53
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 170
180
Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 3490
140
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 45
21
Strength to Weight: Bending, points 22 to 33
20
Thermal Diffusivity, mm2/s 12
4.2
Thermal Shock Resistance, points 20 to 38
13

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.040 to 0.1
Chromium (Cr), % 0.7 to 0.9
17 to 19
Iron (Fe), % 95.1 to 96.3
64.1 to 74
Manganese (Mn), % 0.6 to 0.8
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