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ASTM A387 Grade 91 Class 2 vs. EN 1.4525 Stainless Steel

Both ASTM A387 grade 91 class 2 and EN 1.4525 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 ASTM A387 grade 91 class 2 and the bottom bar is EN 1.4525 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20
5.6 to 13
Fatigue Strength, MPa 330
480 to 540
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
76
Tensile Strength: Ultimate (UTS), MPa 670
1030 to 1250
Tensile Strength: Yield (Proof), MPa 470
840 to 1120

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Mechanical, °C 600
860
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 26
18
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
13
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.6
2.8
Embodied Energy, MJ/kg 37
39
Embodied Water, L/kg 88
130

Common Calculations

PREN (Pitting Resistance) 13
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
68 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 580
1820 to 3230
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24
36 to 45
Strength to Weight: Bending, points 22
29 to 33
Thermal Diffusivity, mm2/s 6.9
4.7
Thermal Shock Resistance, points 19
34 to 41

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0 to 0.070
Chromium (Cr), % 8.0 to 9.5
15 to 17
Copper (Cu), % 0
2.5 to 4.0
Iron (Fe), % 87.3 to 90.3
70.4 to 79
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.85 to 1.1
0 to 0.8
Nickel (Ni), % 0 to 0.4
3.5 to 5.5
Niobium (Nb), % 0.060 to 0.1
0 to 0.35
Nitrogen (N), % 0.030 to 0.070
0 to 0.050
Phosphorus (P), % 0 to 0.020
0 to 0.035
Silicon (Si), % 0.2 to 0.5
0 to 0.8
Sulfur (S), % 0 to 0.010
0 to 0.025
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0