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ACI-ASTM CN7M Steel vs. AISI 304 Stainless Steel

Both ACI-ASTM CN7M steel and AISI 304 stainless steel are iron alloys. They have 72% 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 ACI-ASTM CN7M steel and the bottom bar is AISI 304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
170 to 360
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 44
8.0 to 43
Fatigue Strength, MPa 190
210 to 440
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 480
580 to 1180
Tensile Strength: Yield (Proof), MPa 200
230 to 860

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 430
420
Maximum Temperature: Mechanical, °C 1100
710
Melting Completion (Liquidus), °C 1410
1450
Melting Onset (Solidus), °C 1450
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 21
16
Thermal Expansion, µm/m-K 15
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 32
15
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 5.6
3.0
Embodied Energy, MJ/kg 78
43
Embodied Water, L/kg 210
150

Common Calculations

PREN (Pitting Resistance) 29
20
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
86 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 110
140 to 1870
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
21 to 42
Strength to Weight: Bending, points 17
20 to 32
Thermal Diffusivity, mm2/s 5.6
4.2
Thermal Shock Resistance, points 12
12 to 25

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.080
Chromium (Cr), % 19 to 22
18 to 20
Copper (Cu), % 3.0 to 4.0
0
Iron (Fe), % 37.4 to 48.5
66.5 to 74
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 27.5 to 30.5
8.0 to 10.5
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.5
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030