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AISI 439 Stainless Steel vs. ASTM A225 Steel

Both AISI 439 stainless steel and ASTM A225 steel are iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is AISI 439 stainless steel and the bottom bar is ASTM A225 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
190 to 250
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 23
21 to 23
Fatigue Strength, MPa 170
330 to 390
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 310
390 to 520
Tensile Strength: Ultimate (UTS), MPa 490
620 to 830
Tensile Strength: Yield (Proof), MPa 250
460 to 550

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Maximum Temperature: Mechanical, °C 890
400
Melting Completion (Liquidus), °C 1510
1460
Melting Onset (Solidus), °C 1430
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 25
52
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
2.3
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 2.3
1.8
Embodied Energy, MJ/kg 34
24 to 25
Embodied Water, L/kg 120
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
120 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 160
580 to 820
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
22 to 29
Strength to Weight: Bending, points 18
21 to 25
Thermal Diffusivity, mm2/s 6.7
14
Thermal Shock Resistance, points 16
18 to 24