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ASTM A387 Grade 9 Steel vs. S32950 Stainless Steel

Both ASTM A387 grade 9 steel and S32950 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 32 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 S32950 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
260
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20 to 21
17
Fatigue Strength, MPa 160 to 240
330
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 75
80
Shear Strength, MPa 310 to 380
480
Tensile Strength: Ultimate (UTS), MPa 500 to 600
780
Tensile Strength: Yield (Proof), MPa 230 to 350
550

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Mechanical, °C 600
1100
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 26
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
17
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.1
3.4
Embodied Energy, MJ/kg 28
47
Embodied Water, L/kg 87
180

Common Calculations

PREN (Pitting Resistance) 12
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
120
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
730
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18 to 21
28
Strength to Weight: Bending, points 18 to 20
24
Thermal Diffusivity, mm2/s 6.9
4.3
Thermal Shock Resistance, points 14 to 17
21

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.030
Chromium (Cr), % 8.0 to 10
26 to 29
Iron (Fe), % 87.1 to 90.8
60.3 to 69.4
Manganese (Mn), % 0.3 to 0.6
0 to 2.0
Molybdenum (Mo), % 0.9 to 1.1
1.0 to 2.5
Nickel (Ni), % 0
3.5 to 5.2
Nitrogen (N), % 0
0.15 to 0.35
Phosphorus (P), % 0 to 0.025
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0 to 0.025
0 to 0.010
Vanadium (V), % 0 to 0.040
0