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S21800 Stainless Steel vs. ACI-ASTM CF3MN Steel

Both S21800 stainless steel and ACI-ASTM CF3MN steel are iron alloys. They have 89% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is ACI-ASTM CF3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
170
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
39
Fatigue Strength, MPa 330
250
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
78
Tensile Strength: Ultimate (UTS), MPa 740
580
Tensile Strength: Yield (Proof), MPa 390
290

Thermal Properties

Latent Heat of Fusion, J/g 340
300
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 900
1010
Melting Completion (Liquidus), °C 1360
1440
Melting Onset (Solidus), °C 1310
1390
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 15
19
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 3.1
3.9
Embodied Energy, MJ/kg 45
53
Embodied Water, L/kg 150
160

Common Calculations

PREN (Pitting Resistance) 19
30
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
190
Resilience: Unit (Modulus of Resilience), kJ/m3 390
210
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
20
Strength to Weight: Bending, points 24
20
Thermal Shock Resistance, points 17
13

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.030
Chromium (Cr), % 16 to 18
17 to 22
Iron (Fe), % 59.1 to 65.4
58.7 to 71.9
Manganese (Mn), % 7.0 to 9.0
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 8.0 to 9.0
9.0 to 13
Nitrogen (N), % 0.080 to 0.18
0.1 to 0.2
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 3.5 to 4.5
0 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.040