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ACI-ASTM CB6 Steel vs. S31655 Stainless Steel

Both ACI-ASTM CB6 steel and S31655 stainless steel are iron alloys. They have 90% of their average alloy composition in common. There are 31 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 CB6 steel and the bottom bar is S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 18
39
Fatigue Strength, MPa 410
300
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 880
710
Tensile Strength: Yield (Proof), MPa 660
350

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Maximum Temperature: Corrosion, °C 410
430
Maximum Temperature: Mechanical, °C 870
1010
Melting Completion (Liquidus), °C 1440
1430
Melting Onset (Solidus), °C 1390
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 10
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 12
17
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.5
3.3
Embodied Energy, MJ/kg 36
46
Embodied Water, L/kg 130
160

Common Calculations

PREN (Pitting Resistance) 17
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
230
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 32
25
Strength to Weight: Bending, points 26
23
Thermal Diffusivity, mm2/s 4.6
4.0
Thermal Shock Resistance, points 31
16

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.030
Chromium (Cr), % 15.5 to 17.5
19.5 to 21.5
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 74.4 to 81
63.2 to 71.9
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0.5 to 1.5
Nickel (Ni), % 3.5 to 5.5
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015