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AISI 304 Stainless Steel vs. ACI-ASTM CA6NM Steel

Both AISI 304 stainless steel and ACI-ASTM CA6NM steel are iron alloys. They have 88% 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 AISI 304 stainless steel and the bottom bar is ACI-ASTM CA6NM steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 360
250
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 8.0 to 43
17
Fatigue Strength, MPa 210 to 440
380
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
76
Tensile Strength: Ultimate (UTS), MPa 580 to 1180
850
Tensile Strength: Yield (Proof), MPa 230 to 860
620

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Maximum Temperature: Corrosion, °C 420
390
Maximum Temperature: Mechanical, °C 710
770
Melting Completion (Liquidus), °C 1450
1450
Melting Onset (Solidus), °C 1400
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
25
Thermal Expansion, µm/m-K 17
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
3.2

Otherwise Unclassified Properties

Base Metal Price, % relative 15
10
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.0
2.5
Embodied Energy, MJ/kg 43
34
Embodied Water, L/kg 150
110

Common Calculations

PREN (Pitting Resistance) 20
15
Resilience: Ultimate (Unit Rupture Work), MJ/m3 86 to 250
130
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 1870
1000
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21 to 42
30
Strength to Weight: Bending, points 20 to 32
26
Thermal Diffusivity, mm2/s 4.2
6.7
Thermal Shock Resistance, points 12 to 25
31

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.060
Chromium (Cr), % 18 to 20
11.5 to 14
Iron (Fe), % 66.5 to 74
78.4 to 84.6
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0
0.4 to 1.0
Nickel (Ni), % 8.0 to 10.5
3.5 to 4.5
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030