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AISI 440A Stainless Steel vs. ACI-ASTM CN7MS Steel

Both AISI 440A stainless steel and ACI-ASTM CN7MS steel are iron alloys. They have 68% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is AISI 440A stainless steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 5.0 to 20
39
Fatigue Strength, MPa 270 to 790
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 730 to 1790
540
Tensile Strength: Yield (Proof), MPa 420 to 1650
230

Thermal Properties

Latent Heat of Fusion, J/g 280
340
Maximum Temperature: Corrosion, °C 400
420
Maximum Temperature: Mechanical, °C 760
1040
Melting Completion (Liquidus), °C 1480
1400
Melting Onset (Solidus), °C 1370
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 23
12
Thermal Expansion, µm/m-K 10
16

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
28
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 2.2
5.1
Embodied Energy, MJ/kg 31
71
Embodied Water, L/kg 120
180

Common Calculations

PREN (Pitting Resistance) 18
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 87 to 120
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26 to 65
19
Strength to Weight: Bending, points 23 to 43
19
Thermal Diffusivity, mm2/s 6.2
3.2
Thermal Shock Resistance, points 26 to 65
13

Alloy Composition

Carbon (C), % 0.6 to 0.75
0 to 0.070
Chromium (Cr), % 16 to 18
18 to 20
Copper (Cu), % 0
1.5 to 2.0
Iron (Fe), % 78.4 to 83.4
45.4 to 53.5
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.75
2.5 to 3.0
Nickel (Ni), % 0
22 to 25
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
2.5 to 3.5
Sulfur (S), % 0 to 0.015
0 to 0.030