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AISI 409 Stainless Steel vs. R30556 Alloy

Both AISI 409 stainless steel and R30556 alloy are iron alloys. Both are furnished in the annealed condition. They have 42% of their average alloy composition in common.

For each property being compared, the top bar is AISI 409 stainless steel and the bottom bar is R30556 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 24
45
Fatigue Strength, MPa 140
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
81
Shear Strength, MPa 270
550
Tensile Strength: Ultimate (UTS), MPa 420
780
Tensile Strength: Yield (Proof), MPa 200
350

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Corrosion, °C 450
450
Maximum Temperature: Mechanical, °C 710
1100
Melting Completion (Liquidus), °C 1450
1420
Melting Onset (Solidus), °C 1400
1330
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 25
11
Thermal Expansion, µm/m-K 11
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
70
Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 2.0
8.7
Embodied Energy, MJ/kg 28
130
Embodied Water, L/kg 94
300

Common Calculations

PREN (Pitting Resistance) 11
40
Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
290
Resilience: Unit (Modulus of Resilience), kJ/m3 100
290
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 15
26
Strength to Weight: Bending, points 16
22
Thermal Diffusivity, mm2/s 6.7
2.9
Thermal Shock Resistance, points 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), % 10.5 to 11.7
21 to 23
Cobalt (Co), % 0
16 to 21
Iron (Fe), % 84.9 to 89.5
20.4 to 38.2
Lanthanum (La), % 0
0.0050 to 0.1
Manganese (Mn), % 0 to 1.0
0.5 to 2.0
Molybdenum (Mo), % 0
2.5 to 4.0
Nickel (Ni), % 0 to 0.5
19 to 22.5
Niobium (Nb), % 0
0 to 0.3
Nitrogen (N), % 0
0.1 to 0.3
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
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 0.75
0
Tungsten (W), % 0
2.0 to 3.5
Zinc (Zn), % 0
0.0010 to 0.1