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N08904 Stainless Steel vs. S20431 Stainless Steel

Both N08904 stainless steel and S20431 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 N08904 stainless steel and the bottom bar is S20431 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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