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AISI 312 Stainless Steel vs. ACI-ASTM CN7MS Steel

Both AISI 312 stainless steel and ACI-ASTM CN7MS steel are iron alloys. They have 77% of their average alloy composition in common. There are 30 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 312 stainless steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 250
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
39
Fatigue Strength, MPa 370
200
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 80
77
Tensile Strength: Ultimate (UTS), MPa 780
540
Tensile Strength: Yield (Proof), MPa 510
230

Thermal Properties

Latent Heat of Fusion, J/g 300
340
Maximum Temperature: Corrosion, °C 450
420
Maximum Temperature: Mechanical, °C 1100
1040
Melting Completion (Liquidus), °C 1430
1400
Melting Onset (Solidus), °C 1390
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 16
12
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 17
28
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 3.4
5.1
Embodied Energy, MJ/kg 48
71
Embodied Water, L/kg 170
180

Common Calculations

PREN (Pitting Resistance) 33
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
170
Resilience: Unit (Modulus of Resilience), kJ/m3 640
140
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28
19
Strength to Weight: Bending, points 24
19
Thermal Diffusivity, mm2/s 4.3
3.2
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.070
Chromium (Cr), % 24 to 26
18 to 20
Copper (Cu), % 0
1.5 to 2.0
Iron (Fe), % 62.2 to 69.2
45.4 to 53.5
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 1.2 to 2.0
2.5 to 3.0
Nickel (Ni), % 5.5 to 6.5
22 to 25
Nitrogen (N), % 0.14 to 0.2
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
2.5 to 3.5
Sulfur (S), % 0 to 0.030
0 to 0.030