MakeItFrom.com
Menu (ESC)

AISI 418 Stainless Steel vs. ASTM A356 Grade 8

Both AISI 418 stainless steel and ASTM A356 grade 8 are iron alloys. Both are furnished in the heat treated (HT) condition. They have 83% 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 A356 grade 8.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 330
190
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
21
Fatigue Strength, MPa 520
270
Poisson's Ratio 0.28
0.29
Reduction in Area, % 50
50
Shear Modulus, GPa 77
73
Tensile Strength: Ultimate (UTS), MPa 1100
630
Tensile Strength: Yield (Proof), MPa 850
390

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Maximum Temperature: Mechanical, °C 770
440
Melting Completion (Liquidus), °C 1500
1470
Melting Onset (Solidus), °C 1460
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 25
38
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 15
3.5
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 2.9
2.0
Embodied Energy, MJ/kg 41
26
Embodied Water, L/kg 110
55

Common Calculations

PREN (Pitting Resistance) 19
4.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
390
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 38
22
Strength to Weight: Bending, points 29
21
Thermal Diffusivity, mm2/s 6.7
10
Thermal Shock Resistance, points 40
18

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.2
Chromium (Cr), % 12 to 14
1.0 to 1.5
Iron (Fe), % 78.5 to 83.6
95.4 to 97.4
Manganese (Mn), % 0 to 0.5
0.5 to 0.9
Molybdenum (Mo), % 0 to 0.5
0.9 to 1.2
Nickel (Ni), % 1.8 to 2.2
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 0.5
0.2 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 2.5 to 3.5
0
Vanadium (V), % 0
0.050 to 0.15