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ASTM A356 Grade 8 vs. AISI 415 Stainless Steel

Both ASTM A356 grade 8 and AISI 415 stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 32 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 ASTM A356 grade 8 and the bottom bar is AISI 415 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
17
Fatigue Strength, MPa 270
430
Poisson's Ratio 0.29
0.28
Reduction in Area, % 50
50
Shear Modulus, GPa 73
76
Tensile Strength: Ultimate (UTS), MPa 630
900
Tensile Strength: Yield (Proof), MPa 390
700

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Maximum Temperature: Mechanical, °C 440
780
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 38
24
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 3.5
11
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.0
2.5
Embodied Energy, MJ/kg 26
35
Embodied Water, L/kg 55
110

Common Calculations

PREN (Pitting Resistance) 4.7
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
140
Resilience: Unit (Modulus of Resilience), kJ/m3 390
1250
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
32
Strength to Weight: Bending, points 21
26
Thermal Diffusivity, mm2/s 10
6.4
Thermal Shock Resistance, points 18
33

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.050
Chromium (Cr), % 1.0 to 1.5
11.5 to 14
Iron (Fe), % 95.4 to 97.4
77.8 to 84
Manganese (Mn), % 0.5 to 0.9
0.5 to 1.0
Molybdenum (Mo), % 0.9 to 1.2
0.5 to 1.0
Nickel (Ni), % 0
3.5 to 5.5
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.2 to 0.6
0 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0.050 to 0.15
0