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S21800 Stainless Steel vs. S17400 Stainless Steel

Both S21800 stainless steel and S17400 stainless steel are iron alloys. They have 83% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S21800 stainless steel and the bottom bar is S17400 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
280 to 440
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 40
11 to 21
Fatigue Strength, MPa 330
380 to 670
Poisson's Ratio 0.28
0.28
Reduction in Area, % 62
40 to 62
Shear Modulus, GPa 75
75
Shear Strength, MPa 510
570 to 830
Tensile Strength: Ultimate (UTS), MPa 740
910 to 1390
Tensile Strength: Yield (Proof), MPa 390
580 to 1250

Thermal Properties

Latent Heat of Fusion, J/g 340
280
Maximum Temperature: Corrosion, °C 410
450
Maximum Temperature: Mechanical, °C 900
850
Melting Completion (Liquidus), °C 1360
1440
Melting Onset (Solidus), °C 1310
1400
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
11

Otherwise Unclassified Properties

Base Metal Price, % relative 15
14
Density, g/cm3 7.5
7.8
Embodied Carbon, kg CO2/kg material 3.1
2.7
Embodied Energy, MJ/kg 45
39
Embodied Water, L/kg 150
130

Common Calculations

PREN (Pitting Resistance) 19
16
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
140 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 390
880 to 4060
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
32 to 49
Strength to Weight: Bending, points 24
27 to 35
Thermal Shock Resistance, points 17
30 to 46

Alloy Composition

Carbon (C), % 0 to 0.1
0 to 0.070
Chromium (Cr), % 16 to 18
15 to 17
Copper (Cu), % 0
3.0 to 5.0
Iron (Fe), % 59.1 to 65.4
70.4 to 78.9
Manganese (Mn), % 7.0 to 9.0
0 to 1.0
Nickel (Ni), % 8.0 to 9.0
3.0 to 5.0
Niobium (Nb), % 0
0.15 to 0.45
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 3.5 to 4.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030