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AISI 418 Stainless Steel vs. ASTM A387 Grade 5 Steel

Both AISI 418 stainless steel and ASTM A387 grade 5 steel are iron alloys. They have 87% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is AISI 418 stainless steel and the bottom bar is ASTM A387 grade 5 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
20 to 21
Fatigue Strength, MPa 520
160 to 240
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
74
Shear Strength, MPa 680
310 to 380
Tensile Strength: Ultimate (UTS), MPa 1100
500 to 600
Tensile Strength: Yield (Proof), MPa 850
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Maximum Temperature: Mechanical, °C 770
510
Melting Completion (Liquidus), °C 1500
1460
Melting Onset (Solidus), °C 1460
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 25
40
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 15
4.3
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 2.9
1.7
Embodied Energy, MJ/kg 41
23
Embodied Water, L/kg 110
69

Common Calculations

PREN (Pitting Resistance) 19
6.8
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
140 to 320
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 38
18 to 21
Strength to Weight: Bending, points 29
18 to 20
Thermal Diffusivity, mm2/s 6.7
11
Thermal Shock Resistance, points 40
14 to 17

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.15
Chromium (Cr), % 12 to 14
4.0 to 6.0
Iron (Fe), % 78.5 to 83.6
92.1 to 95.3
Manganese (Mn), % 0 to 0.5
0.3 to 0.6
Molybdenum (Mo), % 0 to 0.5
0.45 to 0.65
Nickel (Ni), % 1.8 to 2.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Tungsten (W), % 2.5 to 3.5
0