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ACI-ASTM CA6NM Steel vs. AISI 420 Stainless Steel

Both ACI-ASTM CA6NM steel and AISI 420 stainless steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CA6NM steel and the bottom bar is AISI 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
190
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 17
8.0 to 15
Fatigue Strength, MPa 380
220 to 670
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
76
Tensile Strength: Ultimate (UTS), MPa 850
690 to 1720
Tensile Strength: Yield (Proof), MPa 620
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Maximum Temperature: Corrosion, °C 390
390
Maximum Temperature: Mechanical, °C 770
620
Melting Completion (Liquidus), °C 1450
1510
Melting Onset (Solidus), °C 1400
1450
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
27
Thermal Expansion, µm/m-K 10
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.2
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
7.5
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.5
2.0
Embodied Energy, MJ/kg 34
28
Embodied Water, L/kg 110
100

Common Calculations

PREN (Pitting Resistance) 15
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
88 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 1000
380 to 4410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 30
25 to 62
Strength to Weight: Bending, points 26
22 to 41
Thermal Diffusivity, mm2/s 6.7
7.3
Thermal Shock Resistance, points 31
25 to 62

Alloy Composition

Carbon (C), % 0 to 0.060
0.15 to 0.4
Chromium (Cr), % 11.5 to 14
12 to 14
Iron (Fe), % 78.4 to 84.6
82.3 to 87.9
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
0 to 0.5
Nickel (Ni), % 3.5 to 4.5
0 to 0.75
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030