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S38815 Stainless Steel vs. S21904 Stainless Steel

Both S38815 stainless steel and S21904 stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is S38815 stainless steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 34
17 to 51
Fatigue Strength, MPa 230
380 to 550
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
78
Shear Strength, MPa 410
510 to 620
Tensile Strength: Ultimate (UTS), MPa 610
700 to 1000
Tensile Strength: Yield (Proof), MPa 290
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Maximum Temperature: Corrosion, °C 400
430
Maximum Temperature: Mechanical, °C 860
980
Melting Completion (Liquidus), °C 1360
1400
Melting Onset (Solidus), °C 1310
1350
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 15
17

Otherwise Unclassified Properties

Base Metal Price, % relative 19
15
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 3.8
3.0
Embodied Energy, MJ/kg 54
43
Embodied Water, L/kg 140
160

Common Calculations

PREN (Pitting Resistance) 18
25
Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 220
380 to 2070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 22
25 to 36
Strength to Weight: Bending, points 21
23 to 29
Thermal Shock Resistance, points 15
15 to 21

Alloy Composition

Aluminum (Al), % 0 to 0.3
0
Carbon (C), % 0 to 0.030
0 to 0.040
Chromium (Cr), % 13 to 15
19 to 21.5
Copper (Cu), % 0.75 to 1.5
0
Iron (Fe), % 56.1 to 67
59.5 to 67.4
Manganese (Mn), % 0 to 2.0
8.0 to 10
Molybdenum (Mo), % 0.75 to 1.5
0
Nickel (Ni), % 13 to 17
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 5.5 to 6.5
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030