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ASTM A387 Grade 9 Steel vs. S41425 Stainless Steel

Both ASTM A387 grade 9 steel and S41425 stainless steel are iron alloys. They have 89% 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 S41425 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
280
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20 to 21
17
Fatigue Strength, MPa 160 to 240
450
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Shear Strength, MPa 310 to 380
570
Tensile Strength: Ultimate (UTS), MPa 500 to 600
920
Tensile Strength: Yield (Proof), MPa 230 to 350
750

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Mechanical, °C 600
810
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
16
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
13
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.1
2.9
Embodied Energy, MJ/kg 28
40
Embodied Water, L/kg 87
120

Common Calculations

PREN (Pitting Resistance) 12
21
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
150
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
1420
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18 to 21
33
Strength to Weight: Bending, points 18 to 20
27
Thermal Diffusivity, mm2/s 6.9
4.4
Thermal Shock Resistance, points 14 to 17
33

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.050
Chromium (Cr), % 8.0 to 10
12 to 15
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 87.1 to 90.8
74 to 81.9
Manganese (Mn), % 0.3 to 0.6
0.5 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
1.5 to 2.0
Nickel (Ni), % 0
4.0 to 7.0
Nitrogen (N), % 0
0.060 to 0.12
Phosphorus (P), % 0 to 0.025
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.025
0 to 0.0050
Vanadium (V), % 0 to 0.040
0