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EN 1.4594 Stainless Steel vs. ASTM A387 Grade 91 Class 2

Both EN 1.4594 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 87% of their average alloy composition in common. There are 31 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 EN 1.4594 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11 to 17
20
Fatigue Strength, MPa 490 to 620
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
75
Shear Strength, MPa 620 to 700
420
Tensile Strength: Ultimate (UTS), MPa 1020 to 1170
670
Tensile Strength: Yield (Proof), MPa 810 to 1140
470

Thermal Properties

Latent Heat of Fusion, J/g 280
270
Maximum Temperature: Mechanical, °C 820
600
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1410
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 16
26
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
10

Otherwise Unclassified Properties

Base Metal Price, % relative 15
7.0
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 3.2
2.6
Embodied Energy, MJ/kg 45
37
Embodied Water, L/kg 130
88

Common Calculations

PREN (Pitting Resistance) 19
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 190
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1660 to 3320
580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 36 to 41
24
Strength to Weight: Bending, points 29 to 31
22
Thermal Diffusivity, mm2/s 4.4
6.9
Thermal Shock Resistance, points 34 to 39
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.070
0.080 to 0.12
Chromium (Cr), % 13 to 15
8.0 to 9.5
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 72.6 to 79.5
87.3 to 90.3
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 1.2 to 2.0
0.85 to 1.1
Nickel (Ni), % 5.0 to 6.0
0 to 0.4
Niobium (Nb), % 0.15 to 0.6
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.7
0.2 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zirconium (Zr), % 0
0 to 0.010