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ASTM Grade HN Steel vs. AISI 329 Stainless Steel

Both ASTM grade HN steel and AISI 329 stainless steel are iron alloys. They have 77% of their average alloy composition in common. There are 26 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 AISI 329 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
240
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 9.0
17
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 77
80
Tensile Strength: Ultimate (UTS), MPa 500
710

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 420
450
Maximum Temperature: Mechanical, °C 1080
1100
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1350
1390
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 16
13

Otherwise Unclassified Properties

Base Metal Price, % relative 26
16
Density, g/cm3 7.9
7.7
Embodied Carbon, kg CO2/kg material 4.6
3.1
Embodied Energy, MJ/kg 66
44
Embodied Water, L/kg 180
170

Common Calculations

PREN (Pitting Resistance) 22
30
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
25
Strength to Weight: Bending, points 18
23
Thermal Diffusivity, mm2/s 3.5
4.3
Thermal Shock Resistance, points 11
19

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.080
Chromium (Cr), % 19 to 23
23 to 28
Iron (Fe), % 44.9 to 57.8
63.1 to 74
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
1.0 to 2.0
Nickel (Ni), % 23 to 27
2.0 to 5.0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 0.75
Sulfur (S), % 0 to 0.040
0 to 0.030