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ASTM Grade HN Steel vs. S31730 Stainless Steel

Both ASTM grade HN steel and S31730 stainless steel are iron alloys. They have 87% of their average alloy composition in common. There are 24 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 ASTM grade HN steel and the bottom bar is S31730 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
180
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 9.0
40
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 500
540

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 420
420
Maximum Temperature: Mechanical, °C 1080
990
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1350
1390
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 26
24
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 4.6
4.6
Embodied Energy, MJ/kg 66
63
Embodied Water, L/kg 180
180

Common Calculations

PREN (Pitting Resistance) 22
30
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 18
18
Thermal Shock Resistance, points 11
12

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.030
Chromium (Cr), % 19 to 23
17 to 19
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 44.9 to 57.8
52.4 to 61
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
3.0 to 4.0
Nickel (Ni), % 23 to 27
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.010