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AISI 308 Stainless Steel vs. ASTM A372 Grade K Steel

Both AISI 308 stainless steel and ASTM A372 grade K steel are iron alloys. They have 72% 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 AISI 308 stainless steel and the bottom bar is ASTM A372 grade K steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
230
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 45
23
Fatigue Strength, MPa 210
440
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
73
Shear Strength, MPa 410
490
Tensile Strength: Ultimate (UTS), MPa 590
780
Tensile Strength: Yield (Proof), MPa 230
620

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 990
440
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
48
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 17
4.4
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 3.2
1.8
Embodied Energy, MJ/kg 46
24
Embodied Water, L/kg 150
57

Common Calculations

PREN (Pitting Resistance) 20
2.7
Resilience: Ultimate (Unit Rupture Work), MJ/m3 210
160
Resilience: Unit (Modulus of Resilience), kJ/m3 140
1010
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
27
Strength to Weight: Bending, points 20
24
Thermal Diffusivity, mm2/s 4.1
13
Thermal Shock Resistance, points 13
23

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.18
Chromium (Cr), % 19 to 21
1.0 to 1.8
Iron (Fe), % 64.1 to 71
93.4 to 96.6
Manganese (Mn), % 0 to 2.0
0.1 to 0.4
Molybdenum (Mo), % 0
0.2 to 0.6
Nickel (Ni), % 10 to 12
2.0 to 3.3
Phosphorus (P), % 0 to 0.045
0 to 0.015
Silicon (Si), % 0 to 0.75
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.010