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EN 1.4938 Stainless Steel vs. ASTM A387 Grade 9 Steel

Both EN 1.4938 stainless steel and ASTM A387 grade 9 steel are iron alloys. They have a moderately high 93% 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 1.4938 stainless steel and the bottom bar is ASTM A387 grade 9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 16 to 17
20 to 21
Fatigue Strength, MPa 390 to 520
160 to 240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
75
Shear Strength, MPa 540 to 630
310 to 380
Tensile Strength: Ultimate (UTS), MPa 870 to 1030
500 to 600
Tensile Strength: Yield (Proof), MPa 640 to 870
230 to 350

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Mechanical, °C 750
600
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 30
26
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
10

Otherwise Unclassified Properties

Base Metal Price, % relative 10
6.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.3
2.1
Embodied Energy, MJ/kg 47
28
Embodied Water, L/kg 110
87

Common Calculations

PREN (Pitting Resistance) 18
12
Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 160
83 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1920
140 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 31 to 37
18 to 21
Strength to Weight: Bending, points 26 to 29
18 to 20
Thermal Diffusivity, mm2/s 8.1
6.9
Thermal Shock Resistance, points 30 to 35
14 to 17

Alloy Composition

Carbon (C), % 0.080 to 0.15
0 to 0.15
Chromium (Cr), % 11 to 12.5
8.0 to 10
Iron (Fe), % 80.5 to 84.8
87.1 to 90.8
Manganese (Mn), % 0.4 to 0.9
0.3 to 0.6
Molybdenum (Mo), % 1.5 to 2.0
0.9 to 1.1
Nickel (Ni), % 2.0 to 3.0
0
Nitrogen (N), % 0.020 to 0.040
0
Phosphorus (P), % 0 to 0.025
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.025
Vanadium (V), % 0.25 to 0.4
0 to 0.040

Comparable Variants