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S20431 Stainless Steel vs. N08904 Stainless Steel

Both S20431 stainless steel and N08904 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 69% of their average alloy composition in common.

For each property being compared, the top bar is S20431 stainless steel and the bottom bar is N08904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 46
38
Fatigue Strength, MPa 320
200
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 86
77
Shear Modulus, GPa 76
79
Shear Strength, MPa 500
370
Tensile Strength: Ultimate (UTS), MPa 710
540
Tensile Strength: Yield (Proof), MPa 350
240

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Maximum Temperature: Corrosion, °C 410
430
Maximum Temperature: Mechanical, °C 890
1100
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1360
1390
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 17
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
32
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 2.5
5.8
Embodied Energy, MJ/kg 36
79
Embodied Water, L/kg 140
200

Common Calculations

PREN (Pitting Resistance) 20
37
Resilience: Ultimate (Unit Rupture Work), MJ/m3 270
170
Resilience: Unit (Modulus of Resilience), kJ/m3 310
150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
19
Strength to Weight: Bending, points 23
18
Thermal Diffusivity, mm2/s 4.0
3.1
Thermal Shock Resistance, points 15
12

Alloy Composition

Carbon (C), % 0 to 0.12
0 to 0.020
Chromium (Cr), % 17 to 18
19 to 23
Copper (Cu), % 1.5 to 3.5
1.0 to 2.0
Iron (Fe), % 66.1 to 74.4
38.8 to 53
Manganese (Mn), % 5.0 to 7.0
0 to 2.0
Molybdenum (Mo), % 0
4.0 to 5.0
Nickel (Ni), % 2.0 to 4.0
23 to 28
Nitrogen (N), % 0.1 to 0.25
0 to 0.1
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.035