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N08904 Stainless Steel vs. S40920 Stainless Steel

Both N08904 stainless steel and S40920 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 58% of their average alloy composition in common.

For each property being compared, the top bar is N08904 stainless steel and the bottom bar is S40920 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
150
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 38
22
Fatigue Strength, MPa 200
130
Poisson's Ratio 0.28
0.28
Rockwell B Hardness 77
77
Shear Modulus, GPa 79
75
Shear Strength, MPa 370
270
Tensile Strength: Ultimate (UTS), MPa 540
430
Tensile Strength: Yield (Proof), MPa 240
190

Thermal Properties

Latent Heat of Fusion, J/g 300
270
Maximum Temperature: Corrosion, °C 430
450
Maximum Temperature: Mechanical, °C 1100
710
Melting Completion (Liquidus), °C 1440
1450
Melting Onset (Solidus), °C 1390
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 12
26
Thermal Expansion, µm/m-K 16
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 32
6.5
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 5.8
2.0
Embodied Energy, MJ/kg 79
28
Embodied Water, L/kg 200
94

Common Calculations

PREN (Pitting Resistance) 37
11
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
78
Resilience: Unit (Modulus of Resilience), kJ/m3 150
97
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
15
Strength to Weight: Bending, points 18
16
Thermal Diffusivity, mm2/s 3.1
6.9
Thermal Shock Resistance, points 12
15

Alloy Composition

Carbon (C), % 0 to 0.020
0 to 0.030
Chromium (Cr), % 19 to 23
10.5 to 11.7
Copper (Cu), % 1.0 to 2.0
0
Iron (Fe), % 38.8 to 53
85.1 to 89.4
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 4.0 to 5.0
0
Nickel (Ni), % 23 to 28
0 to 0.5
Niobium (Nb), % 0
0 to 0.1
Nitrogen (N), % 0 to 0.1
0 to 0.030
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.020
Titanium (Ti), % 0
0.15 to 0.5