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ASTM Grade HN Steel vs. S21904 Stainless Steel

Both ASTM grade HN steel and S21904 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 26 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 ASTM grade HN steel and the bottom bar is S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 9.0
17 to 51
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
78
Tensile Strength: Ultimate (UTS), MPa 500
700 to 1000

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 420
430
Maximum Temperature: Mechanical, °C 1080
980
Melting Completion (Liquidus), °C 1400
1400
Melting Onset (Solidus), °C 1350
1350
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 13
14
Thermal Expansion, µm/m-K 16
17

Otherwise Unclassified Properties

Base Metal Price, % relative 26
15
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 4.6
3.0
Embodied Energy, MJ/kg 66
43
Embodied Water, L/kg 180
160

Common Calculations

PREN (Pitting Resistance) 22
25
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
25 to 36
Strength to Weight: Bending, points 18
23 to 29
Thermal Diffusivity, mm2/s 3.5
3.8
Thermal Shock Resistance, points 11
15 to 21

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.040
Chromium (Cr), % 19 to 23
19 to 21.5
Iron (Fe), % 44.9 to 57.8
59.5 to 67.4
Manganese (Mn), % 0 to 2.0
8.0 to 10
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 23 to 27
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030