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S31100 Stainless Steel vs. ACI-ASTM CH20 Steel

Both S31100 stainless steel and ACI-ASTM CH20 steel are iron alloys. They have a moderately high 92% 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 S31100 stainless steel and the bottom bar is ACI-ASTM CH20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270
190
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 4.5
38
Fatigue Strength, MPa 330
290
Poisson's Ratio 0.27
0.27
Shear Modulus, GPa 79
78
Tensile Strength: Ultimate (UTS), MPa 1000
610
Tensile Strength: Yield (Proof), MPa 710
350

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Maximum Temperature: Corrosion, °C 470
440
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1420
1410
Melting Onset (Solidus), °C 1380
1430
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
14
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 16
20
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.1
3.7
Embodied Energy, MJ/kg 44
53
Embodied Water, L/kg 170
180

Common Calculations

PREN (Pitting Resistance) 26
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 40
200
Resilience: Unit (Modulus of Resilience), kJ/m3 1240
300
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 36
22
Strength to Weight: Bending, points 29
21
Thermal Diffusivity, mm2/s 4.2
3.7
Thermal Shock Resistance, points 28
15

Alloy Composition

Carbon (C), % 0 to 0.060
0 to 0.2
Chromium (Cr), % 25 to 27
22 to 26
Iron (Fe), % 63.6 to 69
54.7 to 66
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 6.0 to 7.0
12 to 15
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040
Titanium (Ti), % 0 to 0.25
0