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ACI-ASTM CK20 Steel vs. N08031 Stainless Steel

Both ACI-ASTM CK20 steel and N08031 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CK20 steel and the bottom bar is N08031 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 37
45
Fatigue Strength, MPa 220
290
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
81
Tensile Strength: Ultimate (UTS), MPa 530
730
Tensile Strength: Yield (Proof), MPa 260
310

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Maximum Temperature: Corrosion, °C 440
460
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1430
1390
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 14
12
Thermal Expansion, µm/m-K 15
18

Otherwise Unclassified Properties

Base Metal Price, % relative 25
39
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 4.4
7.1
Embodied Energy, MJ/kg 62
96
Embodied Water, L/kg 190
240

Common Calculations

PREN (Pitting Resistance) 26
52
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
270
Resilience: Unit (Modulus of Resilience), kJ/m3 170
230
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 19
25
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 3.7
3.1
Thermal Shock Resistance, points 13
14

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.015
Chromium (Cr), % 23 to 27
26 to 28
Copper (Cu), % 0
1.0 to 1.4
Iron (Fe), % 46.7 to 58
29 to 36.9
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
6.0 to 7.0
Nickel (Ni), % 19 to 22
30 to 32
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 2.0
0 to 0.3
Sulfur (S), % 0 to 0.040
0 to 0.010