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ASTM A387 Grade 9 Steel vs. S41045 Stainless Steel

Both ASTM A387 grade 9 steel and S41045 stainless steel are iron alloys. They have a very high 96% 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 S41045 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 20 to 21
25
Fatigue Strength, MPa 160 to 240
160
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
76
Shear Strength, MPa 310 to 380
280
Tensile Strength: Ultimate (UTS), MPa 500 to 600
430
Tensile Strength: Yield (Proof), MPa 230 to 350
230

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Maximum Temperature: Mechanical, °C 600
740
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1410
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 26
29
Thermal Expansion, µm/m-K 13
10

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
8.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.1
2.2
Embodied Energy, MJ/kg 28
31
Embodied Water, L/kg 87
100

Common Calculations

PREN (Pitting Resistance) 12
13
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
92
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18 to 21
16
Strength to Weight: Bending, points 18 to 20
16
Thermal Diffusivity, mm2/s 6.9
7.8
Thermal Shock Resistance, points 14 to 17
16

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.030
Chromium (Cr), % 8.0 to 10
12 to 13
Iron (Fe), % 87.1 to 90.8
83.8 to 88
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0 to 0.6
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030
Vanadium (V), % 0 to 0.040
0