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S21800 Stainless Steel vs. ACI-ASTM CN7M Steel

Both S21800 stainless steel and ACI-ASTM CN7M steel are iron alloys. They have 70% 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 CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
44
Fatigue Strength, MPa 330
190
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Tensile Strength: Ultimate (UTS), MPa 740
480
Tensile Strength: Yield (Proof), MPa 390
200

Thermal Properties

Latent Heat of Fusion, J/g 340
310
Maximum Temperature: Corrosion, °C 410
430
Maximum Temperature: Mechanical, °C 900
1100
Melting Completion (Liquidus), °C 1360
1410
Melting Onset (Solidus), °C 1310
1450
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 16
15

Otherwise Unclassified Properties

Base Metal Price, % relative 15
32
Density, g/cm3 7.5
8.1
Embodied Carbon, kg CO2/kg material 3.1
5.6
Embodied Energy, MJ/kg 45
78
Embodied Water, L/kg 150
210

Common Calculations

PREN (Pitting Resistance) 19
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
170
Resilience: Unit (Modulus of Resilience), kJ/m3 390
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
24
Strength to Weight: Axial, points 27
17
Strength to Weight: Bending, points 24
17
Thermal Shock Resistance, points 17
12

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.070
Chromium (Cr), % 16 to 18
19 to 22
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 59.1 to 65.4
37.4 to 48.5
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
27.5 to 30.5
Nitrogen (N), % 0.080 to 0.18
0
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