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ASTM A387 Grade 9 Steel vs. EN 1.4911 Stainless Steel

Both ASTM A387 grade 9 steel and EN 1.4911 stainless steel are iron alloys. They have a moderately high 91% 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 ASTM A387 grade 9 steel and the bottom bar is EN 1.4911 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20 to 21
11
Fatigue Strength, MPa 160 to 240
530
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
76
Shear Strength, MPa 310 to 380
640
Tensile Strength: Ultimate (UTS), MPa 500 to 600
1070
Tensile Strength: Yield (Proof), MPa 230 to 350
970

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Mechanical, °C 600
700
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1410
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 26
20
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 10
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
20
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.1
3.4
Embodied Energy, MJ/kg 28
49
Embodied Water, L/kg 87
130

Common Calculations

PREN (Pitting Resistance) 12
14
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
2410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18 to 21
38
Strength to Weight: Bending, points 18 to 20
30
Thermal Diffusivity, mm2/s 6.9
5.4
Thermal Shock Resistance, points 14 to 17
37

Alloy Composition

Boron (B), % 0
0.0050 to 0.015
Carbon (C), % 0 to 0.15
0.050 to 0.12
Chromium (Cr), % 8.0 to 10
9.8 to 11.2
Cobalt (Co), % 0
5.0 to 7.0
Iron (Fe), % 87.1 to 90.8
75.7 to 83.8
Manganese (Mn), % 0.3 to 0.6
0.3 to 1.3
Molybdenum (Mo), % 0.9 to 1.1
0.5 to 1.0
Nickel (Ni), % 0
0.2 to 1.2
Niobium (Nb), % 0
0.2 to 0.5
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 1.0
0.1 to 0.8
Sulfur (S), % 0 to 0.025
0 to 0.015
Tungsten (W), % 0
0 to 0.7
Vanadium (V), % 0 to 0.040
0.1 to 0.4