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ACI-ASTM CK20 Steel vs. S39277 Stainless Steel

Both ACI-ASTM CK20 steel and S39277 stainless steel are iron alloys. They have 86% 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 ACI-ASTM CK20 steel and the bottom bar is S39277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
250
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 37
28
Fatigue Strength, MPa 220
480
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
80
Tensile Strength: Ultimate (UTS), MPa 530
930
Tensile Strength: Yield (Proof), MPa 260
660

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 440
450
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1430
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 14
16
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 25
23
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 4.4
4.2
Embodied Energy, MJ/kg 62
59
Embodied Water, L/kg 190
180

Common Calculations

PREN (Pitting Resistance) 26
43
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
240
Resilience: Unit (Modulus of Resilience), kJ/m3 170
1070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
33
Strength to Weight: Bending, points 19
27
Thermal Diffusivity, mm2/s 3.7
4.2
Thermal Shock Resistance, points 13
26

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.025
Chromium (Cr), % 23 to 27
24 to 26
Copper (Cu), % 0
1.2 to 2.0
Iron (Fe), % 46.7 to 58
56.8 to 64.3
Manganese (Mn), % 0 to 2.0
0 to 0.8
Molybdenum (Mo), % 0 to 0.5
3.0 to 4.0
Nickel (Ni), % 19 to 22
6.5 to 8.0
Nitrogen (N), % 0
0.23 to 0.33
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 2.0
0 to 0.8
Sulfur (S), % 0 to 0.040
0 to 0.0020
Tungsten (W), % 0
0.8 to 1.2