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AISI 321 Stainless Steel vs. R30556 Alloy

Both AISI 321 stainless steel and R30556 alloy are iron alloys. They have 59% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is AISI 321 stainless steel and the bottom bar is R30556 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 34 to 50
45
Fatigue Strength, MPa 220 to 270
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
81
Shear Strength, MPa 420 to 460
550
Tensile Strength: Ultimate (UTS), MPa 590 to 690
780
Tensile Strength: Yield (Proof), MPa 220 to 350
350

Thermal Properties

Latent Heat of Fusion, J/g 290
300
Maximum Temperature: Corrosion, °C 480
450
Maximum Temperature: Mechanical, °C 870
1100
Melting Completion (Liquidus), °C 1430
1420
Melting Onset (Solidus), °C 1400
1330
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 16
11
Thermal Expansion, µm/m-K 17
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 16
70
Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 3.2
8.7
Embodied Energy, MJ/kg 45
130
Embodied Water, L/kg 140
300

Common Calculations

PREN (Pitting Resistance) 19
40
Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 230
290
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 310
290
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 21 to 25
26
Strength to Weight: Bending, points 20 to 22
22
Thermal Diffusivity, mm2/s 4.1
2.9
Thermal Shock Resistance, points 13 to 15
18

Alloy Composition

Aluminum (Al), % 0
0.1 to 0.5
Boron (B), % 0
0 to 0.020
Carbon (C), % 0 to 0.080
0.050 to 0.15
Chromium (Cr), % 17 to 19
21 to 23
Cobalt (Co), % 0
16 to 21
Iron (Fe), % 65.3 to 74
20.4 to 38.2
Lanthanum (La), % 0
0.0050 to 0.1
Manganese (Mn), % 0 to 2.0
0.5 to 2.0
Molybdenum (Mo), % 0
2.5 to 4.0
Nickel (Ni), % 9.0 to 12
19 to 22.5
Niobium (Nb), % 0
0 to 0.3
Nitrogen (N), % 0 to 0.1
0.1 to 0.3
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 0.75
0.2 to 0.8
Sulfur (S), % 0 to 0.030
0 to 0.015
Tantalum (Ta), % 0
0.3 to 1.3
Titanium (Ti), % 0 to 0.7
0
Tungsten (W), % 0
2.0 to 3.5
Zinc (Zn), % 0
0.0010 to 0.1