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S21900 Stainless Steel vs. ASTM Grade HI Steel

Both S21900 stainless steel and ASTM grade HI steel are iron alloys. They have 82% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is S21900 stainless steel and the bottom bar is ASTM grade HI steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
160
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
11
Fatigue Strength, MPa 380
150
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 78
79
Tensile Strength: Ultimate (UTS), MPa 710
550
Tensile Strength: Yield (Proof), MPa 390
270

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Maximum Temperature: Corrosion, °C 420
450
Maximum Temperature: Mechanical, °C 980
1100
Melting Completion (Liquidus), °C 1400
1400
Melting Onset (Solidus), °C 1350
1350
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 15
23
Density, g/cm3 7.7
7.8
Embodied Carbon, kg CO2/kg material 3.0
4.1
Embodied Energy, MJ/kg 43
59
Embodied Water, L/kg 160
200

Common Calculations

PREN (Pitting Resistance) 25
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
52
Resilience: Unit (Modulus of Resilience), kJ/m3 380
180
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
20
Strength to Weight: Bending, points 23
19
Thermal Diffusivity, mm2/s 3.8
3.9
Thermal Shock Resistance, points 15
12

Alloy Composition

Carbon (C), % 0 to 0.080
0.2 to 0.5
Chromium (Cr), % 19 to 21.5
26 to 30
Iron (Fe), % 59.4 to 67.4
46.9 to 59.8
Manganese (Mn), % 8.0 to 10
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 5.5 to 7.5
14 to 18
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040