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EN 1.4658 Stainless Steel vs. ASTM A387 Grade 91 Class 2

Both EN 1.4658 stainless steel and ASTM A387 grade 91 class 2 are iron alloys. They have 68% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.4658 stainless steel and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 260
200
Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 28
20
Fatigue Strength, MPa 530
330
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 81
75
Shear Strength, MPa 580
420
Tensile Strength: Ultimate (UTS), MPa 900
670
Tensile Strength: Yield (Proof), MPa 730
470

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Mechanical, °C 1100
600
Melting Completion (Liquidus), °C 1450
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 16
26
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
7.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.5
2.6
Embodied Energy, MJ/kg 61
37
Embodied Water, L/kg 200
88

Common Calculations

PREN (Pitting Resistance) 49
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
120
Resilience: Unit (Modulus of Resilience), kJ/m3 1280
580
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 32
24
Strength to Weight: Bending, points 26
22
Thermal Diffusivity, mm2/s 4.3
6.9
Thermal Shock Resistance, points 24
19

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Carbon (C), % 0 to 0.030
0.080 to 0.12
Chromium (Cr), % 26 to 29
8.0 to 9.5
Cobalt (Co), % 0.5 to 2.0
0
Copper (Cu), % 0 to 1.0
0
Iron (Fe), % 50.9 to 63.7
87.3 to 90.3
Manganese (Mn), % 0 to 1.5
0.3 to 0.6
Molybdenum (Mo), % 4.0 to 5.0
0.85 to 1.1
Nickel (Ni), % 5.5 to 9.5
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0.3 to 0.5
0.030 to 0.070
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0 to 0.5
0.2 to 0.5
Sulfur (S), % 0 to 0.010
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