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SAE-AISI 1345 Steel vs. S21800 Stainless Steel

Both SAE-AISI 1345 steel and S21800 stainless steel are iron alloys. They have 64% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1345 steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170 to 210
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 23
40
Fatigue Strength, MPa 230 to 390
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75
Shear Strength, MPa 370 to 440
510
Tensile Strength: Ultimate (UTS), MPa 590 to 730
740
Tensile Strength: Yield (Proof), MPa 330 to 620
390

Thermal Properties

Latent Heat of Fusion, J/g 250
340
Maximum Temperature: Mechanical, °C 400
900
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1410
1310
Specific Heat Capacity, J/kg-K 470
500
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
15
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 1.4
3.1
Embodied Energy, MJ/kg 19
45
Embodied Water, L/kg 48
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78 to 120
250
Resilience: Unit (Modulus of Resilience), kJ/m3 290 to 1040
390
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 21 to 26
27
Strength to Weight: Bending, points 20 to 23
24
Thermal Shock Resistance, points 19 to 23
17

Alloy Composition

Carbon (C), % 0.43 to 0.48
0 to 0.1
Chromium (Cr), % 0
16 to 18
Iron (Fe), % 97.2 to 97.8
59.1 to 65.4
Manganese (Mn), % 1.6 to 1.9
7.0 to 9.0
Nickel (Ni), % 0
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.035
0 to 0.060
Silicon (Si), % 0.15 to 0.35
3.5 to 4.5
Sulfur (S), % 0 to 0.040
0 to 0.030