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AISI 321 Stainless Steel vs. ASTM A225 Steel

Both AISI 321 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 (2, in this case) are not shown.

For each property being compared, the top bar is AISI 321 stainless steel and the bottom bar is ASTM A225 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 210
190 to 250
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34 to 50
21 to 23
Fatigue Strength, MPa 220 to 270
330 to 390
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
73
Shear Strength, MPa 420 to 460
390 to 520
Tensile Strength: Ultimate (UTS), MPa 590 to 690
620 to 830
Tensile Strength: Yield (Proof), MPa 220 to 350
460 to 550

Thermal Properties

Latent Heat of Fusion, J/g 290
250
Maximum Temperature: Mechanical, °C 870
400
Melting Completion (Liquidus), °C 1430
1460
Melting Onset (Solidus), °C 1400
1420
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 16
52
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 16
2.3
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 3.2
1.8
Embodied Energy, MJ/kg 45
24 to 25
Embodied Water, L/kg 140
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 230
120 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 310
580 to 820
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21 to 25
22 to 29
Strength to Weight: Bending, points 20 to 22
21 to 25
Thermal Diffusivity, mm2/s 4.1
14
Thermal Shock Resistance, points 13 to 15
18 to 24

Comparable Variants