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ASTM A225 Steel vs. AISI 439 Stainless Steel

Both ASTM A225 steel and AISI 439 stainless 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 ASTM A225 steel and the bottom bar is AISI 439 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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