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S21900 Stainless Steel vs. AISI 348 Stainless Steel

Both S21900 stainless steel and AISI 348 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 89% of their average alloy composition in common. There are 34 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 S21900 stainless steel and the bottom bar is AISI 348 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
170
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
41
Fatigue Strength, MPa 380
200
Poisson's Ratio 0.28
0.28
Reduction in Area, % 57
53
Shear Modulus, GPa 78
77
Shear Strength, MPa 510
400
Tensile Strength: Ultimate (UTS), MPa 710
580
Tensile Strength: Yield (Proof), MPa 390
230

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Maximum Temperature: Corrosion, °C 420
480
Maximum Temperature: Mechanical, °C 980
940
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1350
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
16
Thermal Expansion, µm/m-K 17
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 15
19
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.0
3.7
Embodied Energy, MJ/kg 43
54
Embodied Water, L/kg 160
150

Common Calculations

PREN (Pitting Resistance) 25
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
190
Resilience: Unit (Modulus of Resilience), kJ/m3 380
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
21
Strength to Weight: Bending, points 23
20
Thermal Diffusivity, mm2/s 3.8
4.2
Thermal Shock Resistance, points 15
13

Alloy Composition

Carbon (C), % 0 to 0.080
0 to 0.080
Chromium (Cr), % 19 to 21.5
17 to 19
Cobalt (Co), % 0
0 to 0.2
Iron (Fe), % 59.4 to 67.4
63.8 to 74
Manganese (Mn), % 8.0 to 10
0 to 2.0
Nickel (Ni), % 5.5 to 7.5
9.0 to 13
Niobium (Nb), % 0
0 to 1.0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0 to 0.1