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EN 1.4749 Stainless Steel vs. ASTM A387 Grade 91 Class 2

Both EN 1.4749 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 81% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is EN 1.4749 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
200
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 16
20
Fatigue Strength, MPa 190
330
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 80
75
Shear Strength, MPa 370
420
Tensile Strength: Ultimate (UTS), MPa 600
670
Tensile Strength: Yield (Proof), MPa 320
470

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Mechanical, °C 1100
600
Melting Completion (Liquidus), °C 1420
1460
Melting Onset (Solidus), °C 1380
1420
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 17
26
Thermal Expansion, µm/m-K 9.6
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
10

Otherwise Unclassified Properties

Base Metal Price, % relative 13
7.0
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 2.5
2.6
Embodied Energy, MJ/kg 36
37
Embodied Water, L/kg 160
88

Common Calculations

PREN (Pitting Resistance) 31
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
120
Resilience: Unit (Modulus of Resilience), kJ/m3 250
580
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 22
24
Strength to Weight: Bending, points 21
22
Thermal Diffusivity, mm2/s 4.6
6.9
Thermal Shock Resistance, points 22
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0.15 to 0.2
0.080 to 0.12
Chromium (Cr), % 26 to 29
8.0 to 9.5
Iron (Fe), % 68.5 to 73.7
87.3 to 90.3
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0.15 to 0.25
0.030 to 0.070
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
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