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ACI-ASTM CN7MS Steel vs. AISI 304 Stainless Steel

Both ACI-ASTM CN7MS steel and AISI 304 stainless steel are iron alloys. They have 79% of their average alloy composition in common. There are 30 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 CN7MS steel and the bottom bar is AISI 304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
170 to 360
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
8.0 to 43
Fatigue Strength, MPa 200
210 to 440
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 540
580 to 1180
Tensile Strength: Yield (Proof), MPa 230
230 to 860

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 1040
710
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 12
16
Thermal Expansion, µm/m-K 16
17

Otherwise Unclassified Properties

Base Metal Price, % relative 28
15
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 5.1
3.0
Embodied Energy, MJ/kg 71
43
Embodied Water, L/kg 180
150

Common Calculations

PREN (Pitting Resistance) 28
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
86 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 140
140 to 1870
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
21 to 42
Strength to Weight: Bending, points 19
20 to 32
Thermal Diffusivity, mm2/s 3.2
4.2
Thermal Shock Resistance, points 13
12 to 25

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.080
Chromium (Cr), % 18 to 20
18 to 20
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
66.5 to 74
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.0
0
Nickel (Ni), % 22 to 25
8.0 to 10.5
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 2.5 to 3.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030