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ASTM A387 Grade 9 Steel vs. S31727 Stainless Steel

Both ASTM A387 grade 9 steel and S31727 stainless steel are iron alloys. They have 68% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (7, 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 S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150 to 180
190
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20 to 21
40
Fatigue Strength, MPa 160 to 240
240
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
78
Shear Strength, MPa 310 to 380
430
Tensile Strength: Ultimate (UTS), MPa 500 to 600
630
Tensile Strength: Yield (Proof), MPa 230 to 350
270

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Mechanical, °C 600
1010
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1410
1390
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
24
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 2.1
4.7
Embodied Energy, MJ/kg 28
64
Embodied Water, L/kg 87
180

Common Calculations

PREN (Pitting Resistance) 12
35
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
200
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 310
190
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18 to 21
22
Strength to Weight: Bending, points 18 to 20
20
Thermal Shock Resistance, points 14 to 17
14

Alloy Composition

Carbon (C), % 0 to 0.15
0 to 0.030
Chromium (Cr), % 8.0 to 10
17.5 to 19
Copper (Cu), % 0
2.8 to 4.0
Iron (Fe), % 87.1 to 90.8
53.7 to 61.3
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
3.8 to 4.5
Nickel (Ni), % 0
14.5 to 16.5
Nitrogen (N), % 0
0.15 to 0.21
Phosphorus (P), % 0 to 0.025
0 to 0.030
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