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AISI 418 Stainless Steel vs. AISI 347H Stainless Steel

Both AISI 418 stainless steel and AISI 347H stainless steel are iron alloys. They have 85% of their average alloy composition in common. There are 34 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 AISI 418 stainless steel and the bottom bar is AISI 347H stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
39
Fatigue Strength, MPa 520
200
Poisson's Ratio 0.28
0.28
Reduction in Area, % 50
51
Shear Modulus, GPa 77
77
Shear Strength, MPa 680
400
Tensile Strength: Ultimate (UTS), MPa 1100
580
Tensile Strength: Yield (Proof), MPa 850
230

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 390
480
Maximum Temperature: Mechanical, °C 770
940
Melting Completion (Liquidus), °C 1500
1430
Melting Onset (Solidus), °C 1460
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 25
16
Thermal Expansion, µm/m-K 10
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 15
19
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 2.9
3.6
Embodied Energy, MJ/kg 41
52
Embodied Water, L/kg 110
150

Common Calculations

PREN (Pitting Resistance) 19
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
180
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
21
Strength to Weight: Bending, points 29
20
Thermal Diffusivity, mm2/s 6.7
4.2
Thermal Shock Resistance, points 40
13

Alloy Composition

Carbon (C), % 0.15 to 0.2
0.040 to 0.1
Chromium (Cr), % 12 to 14
17 to 19
Iron (Fe), % 78.5 to 83.6
64.1 to 74
Manganese (Mn), % 0 to 0.5
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 1.8 to 2.2
9.0 to 13
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 2.5 to 3.5
0