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ASTM A372 Grade K Steel vs. S30815 Stainless Steel

Both ASTM A372 grade K steel and S30815 stainless steel are iron alloys. They have 70% 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 A372 grade K steel and the bottom bar is S30815 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 230
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 23
45
Fatigue Strength, MPa 440
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 73
77
Shear Strength, MPa 490
480
Tensile Strength: Ultimate (UTS), MPa 780
680
Tensile Strength: Yield (Proof), MPa 620
350

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 440
1020
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1360
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 48
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 4.4
17
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 1.8
3.3
Embodied Energy, MJ/kg 24
47
Embodied Water, L/kg 57
160

Common Calculations

PREN (Pitting Resistance) 2.7
24
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
260
Resilience: Unit (Modulus of Resilience), kJ/m3 1010
310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 27
25
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 13
4.0
Thermal Shock Resistance, points 23
15

Alloy Composition

Carbon (C), % 0 to 0.18
0.050 to 0.1
Cerium (Ce), % 0
0.030 to 0.080
Chromium (Cr), % 1.0 to 1.8
20 to 22
Iron (Fe), % 93.4 to 96.6
62.8 to 68.4
Manganese (Mn), % 0.1 to 0.4
0 to 0.8
Molybdenum (Mo), % 0.2 to 0.6
0
Nickel (Ni), % 2.0 to 3.3
10 to 12
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0.15 to 0.35
1.4 to 2.0
Sulfur (S), % 0 to 0.010
0 to 0.030