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ACI-ASTM CN7MS Steel vs. AISI 317 Stainless Steel

Both ACI-ASTM CN7MS steel and AISI 317 stainless steel are iron alloys. They have 85% of their average alloy composition in common. There are 30 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 CN7MS steel and the bottom bar is AISI 317 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
170 to 220
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 39
35 to 55
Fatigue Strength, MPa 200
250 to 330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 540
580 to 710
Tensile Strength: Yield (Proof), MPa 230
250 to 420

Thermal Properties

Latent Heat of Fusion, J/g 340
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 1040
590
Melting Completion (Liquidus), °C 1400
1400
Melting Onset (Solidus), °C 1350
1380
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 12
15
Thermal Expansion, µm/m-K 16
17

Otherwise Unclassified Properties

Base Metal Price, % relative 28
21
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 5.1
4.3
Embodied Energy, MJ/kg 71
59
Embodied Water, L/kg 180
160

Common Calculations

PREN (Pitting Resistance) 28
31
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
210 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 140
150 to 430
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 19
20 to 25
Strength to Weight: Bending, points 19
20 to 22
Thermal Diffusivity, mm2/s 3.2
4.1
Thermal Shock Resistance, points 13
12 to 15

Alloy Composition

Carbon (C), % 0 to 0.070
0 to 0.080
Chromium (Cr), % 18 to 20
18 to 20
Copper (Cu), % 1.5 to 2.0
0
Iron (Fe), % 45.4 to 53.5
58 to 68
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 2.5 to 3.0
3.0 to 4.0
Nickel (Ni), % 22 to 25
11 to 15
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 2.5 to 3.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030