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EN 1.4988 Stainless Steel vs. ACI-ASTM CN7MS Steel

Both EN 1.4988 stainless steel and ACI-ASTM CN7MS steel are iron alloys. They have 82% 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 EN 1.4988 stainless steel and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
39
Fatigue Strength, MPa 230
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 640
540
Tensile Strength: Yield (Proof), MPa 290
230

Thermal Properties

Latent Heat of Fusion, J/g 290
340
Maximum Temperature: Corrosion, °C 520
420
Maximum Temperature: Mechanical, °C 920
1040
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1400
1350
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 23
28
Density, g/cm3 7.9
7.9
Embodied Carbon, kg CO2/kg material 6.0
5.1
Embodied Energy, MJ/kg 89
71
Embodied Water, L/kg 150
180

Common Calculations

PREN (Pitting Resistance) 22
28
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
170
Resilience: Unit (Modulus of Resilience), kJ/m3 210
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 23
19
Strength to Weight: Bending, points 21
19
Thermal Diffusivity, mm2/s 4.0
3.2
Thermal Shock Resistance, points 14
13

Alloy Composition

Carbon (C), % 0.040 to 0.1
0 to 0.070
Chromium (Cr), % 15.5 to 17.5
18 to 20
Copper (Cu), % 0
1.5 to 2.0
Iron (Fe), % 62.1 to 69.5
45.4 to 53.5
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 1.1 to 1.5
2.5 to 3.0
Nickel (Ni), % 12.5 to 14.5
22 to 25
Niobium (Nb), % 0.4 to 1.2
0
Nitrogen (N), % 0.060 to 0.14
0
Phosphorus (P), % 0 to 0.035
0 to 0.040
Silicon (Si), % 0.3 to 0.6
2.5 to 3.5
Sulfur (S), % 0 to 0.015
0 to 0.030
Vanadium (V), % 0.6 to 0.85
0