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S21800 Stainless Steel vs. ASTM Grade HN Steel

Both S21800 stainless steel and ASTM grade HN steel are iron alloys. They have 79% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
9.0
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Tensile Strength: Ultimate (UTS), MPa 740
500

Thermal Properties

Latent Heat of Fusion, J/g 340
310
Maximum Temperature: Corrosion, °C 410
420
Maximum Temperature: Mechanical, °C 900
1080
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 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 15
26
Density, g/cm3 7.5
7.9
Embodied Carbon, kg CO2/kg material 3.1
4.6
Embodied Energy, MJ/kg 45
66
Embodied Water, L/kg 150
180

Common Calculations

PREN (Pitting Resistance) 19
22
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
17
Strength to Weight: Bending, points 24
18
Thermal Shock Resistance, points 17
11

Alloy Composition

Carbon (C), % 0 to 0.1
0.2 to 0.5
Chromium (Cr), % 16 to 18
19 to 23
Iron (Fe), % 59.1 to 65.4
44.9 to 57.8
Manganese (Mn), % 7.0 to 9.0
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 8.0 to 9.0
23 to 27
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 2.0
Sulfur (S), % 0 to 0.030
0 to 0.040