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ASTM A387 Grade 9 Steel vs. AISI 440A Stainless Steel

Both ASTM A387 grade 9 steel and AISI 440A stainless steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 AISI 440A stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20 to 21
5.0 to 20
Fatigue Strength, MPa 160 to 240
270 to 790
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Shear Strength, MPa 310 to 380
450 to 1040
Tensile Strength: Ultimate (UTS), MPa 500 to 600
730 to 1790
Tensile Strength: Yield (Proof), MPa 230 to 350
420 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Maximum Temperature: Mechanical, °C 600
760
Melting Completion (Liquidus), °C 1460
1480
Melting Onset (Solidus), °C 1410
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 26
23
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 10
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
9.0
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.1
2.2
Embodied Energy, MJ/kg 28
31
Embodied Water, L/kg 87
120

Common Calculations

PREN (Pitting Resistance) 12
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83 to 110
87 to 120
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 18 to 21
26 to 65
Strength to Weight: Bending, points 18 to 20
23 to 43
Thermal Diffusivity, mm2/s 6.9
6.2
Thermal Shock Resistance, points 14 to 17
26 to 65

Alloy Composition

Carbon (C), % 0 to 0.15
0.6 to 0.75
Chromium (Cr), % 8.0 to 10
16 to 18
Iron (Fe), % 87.1 to 90.8
78.4 to 83.4
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0 to 0.75
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 0.015
Vanadium (V), % 0 to 0.040
0

Comparable Variants