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ACI-ASTM CK20 Steel vs. S44627 Stainless Steel

Both ACI-ASTM CK20 steel and S44627 stainless steel are iron alloys. They have 78% 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 ACI-ASTM CK20 steel and the bottom bar is S44627 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 37
24
Fatigue Strength, MPa 220
200
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
80
Tensile Strength: Ultimate (UTS), MPa 530
490
Tensile Strength: Yield (Proof), MPa 260
300

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 440
470
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
17
Thermal Expansion, µm/m-K 15
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 25
14
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 4.4
2.9
Embodied Energy, MJ/kg 62
41
Embodied Water, L/kg 190
160

Common Calculations

PREN (Pitting Resistance) 26
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
100
Resilience: Unit (Modulus of Resilience), kJ/m3 170
220
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
18
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 3.7
4.6
Thermal Shock Resistance, points 13
16

Alloy Composition

Carbon (C), % 0 to 0.2
0 to 0.010
Chromium (Cr), % 23 to 27
25 to 27.5
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 46.7 to 58
69.2 to 74.2
Manganese (Mn), % 0 to 2.0
0 to 0.4
Molybdenum (Mo), % 0 to 0.5
0.75 to 1.5
Nickel (Ni), % 19 to 22
0 to 0.5
Niobium (Nb), % 0
0.050 to 0.2
Nitrogen (N), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 2.0
0 to 0.4
Sulfur (S), % 0 to 0.040
0 to 0.020