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S40930 Stainless Steel vs. S21904 Stainless Steel

Both S40930 stainless steel and S21904 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 33 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 S40930 stainless steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 23
17 to 51
Fatigue Strength, MPa 130
380 to 550
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
78
Shear Strength, MPa 270
510 to 620
Tensile Strength: Ultimate (UTS), MPa 430
700 to 1000
Tensile Strength: Yield (Proof), MPa 190
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Corrosion, °C 460
430
Maximum Temperature: Mechanical, °C 710
980
Melting Completion (Liquidus), °C 1450
1400
Melting Onset (Solidus), °C 1410
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 25
14
Thermal Expansion, µm/m-K 10
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 8.5
15
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 2.3
3.0
Embodied Energy, MJ/kg 32
43
Embodied Water, L/kg 94
160

Common Calculations

PREN (Pitting Resistance) 11
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 94
380 to 2070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 16
25 to 36
Strength to Weight: Bending, points 16
23 to 29
Thermal Diffusivity, mm2/s 6.7
3.8
Thermal Shock Resistance, points 16
15 to 21

Alloy Composition

Carbon (C), % 0 to 0.030
0 to 0.040
Chromium (Cr), % 10.5 to 11.7
19 to 21.5
Iron (Fe), % 84.7 to 89.4
59.5 to 67.4
Manganese (Mn), % 0 to 1.0
8.0 to 10
Nickel (Ni), % 0 to 0.5
5.5 to 7.5
Niobium (Nb), % 0.080 to 0.75
0
Nitrogen (N), % 0 to 0.030
0.15 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0.050 to 0.2
0