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ASTM A387 Grade 91 Class 2 vs. EN 1.4618 Stainless Steel

Both ASTM A387 grade 91 class 2 and EN 1.4618 stainless steel are iron alloys. They have 77% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 91 class 2 and the bottom bar is EN 1.4618 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
200 to 210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20
51
Fatigue Strength, MPa 330
240 to 250
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Shear Strength, MPa 420
480 to 500
Tensile Strength: Ultimate (UTS), MPa 670
680 to 700
Tensile Strength: Yield (Proof), MPa 470
250 to 260

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Mechanical, °C 600
900
Melting Completion (Liquidus), °C 1460
1400
Melting Onset (Solidus), °C 1420
1360
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 26
15
Thermal Expansion, µm/m-K 13
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
13
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.6
2.7
Embodied Energy, MJ/kg 37
39
Embodied Water, L/kg 88
150

Common Calculations

PREN (Pitting Resistance) 13
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
270 to 280
Resilience: Unit (Modulus of Resilience), kJ/m3 580
160 to 170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
24 to 25
Strength to Weight: Bending, points 22
22 to 23
Thermal Diffusivity, mm2/s 6.9
4.0
Thermal Shock Resistance, points 19
15 to 16

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0 to 0.1
Chromium (Cr), % 8.0 to 9.5
16.5 to 18.5
Copper (Cu), % 0
1.0 to 2.5
Iron (Fe), % 87.3 to 90.3
62.7 to 72.5
Manganese (Mn), % 0.3 to 0.6
5.5 to 9.5
Molybdenum (Mo), % 0.85 to 1.1
0
Nickel (Ni), % 0 to 0.4
4.5 to 5.5
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0 to 0.15
Phosphorus (P), % 0 to 0.020
0 to 0.070
Silicon (Si), % 0.2 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.010
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0