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ASTM Grade HN Steel vs. AISI 303 Stainless Steel

Both ASTM grade HN steel and AISI 303 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 (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 303 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
170 to 210
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 9.0
40 to 51
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 77
77
Tensile Strength: Ultimate (UTS), MPa 500
600 to 690

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 420
410
Maximum Temperature: Mechanical, °C 1080
930
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1350
1400
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 16
17

Otherwise Unclassified Properties

Base Metal Price, % relative 26
15
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 4.6
3.0
Embodied Energy, MJ/kg 66
42
Embodied Water, L/kg 180
140

Common Calculations

PREN (Pitting Resistance) 22
18
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
21 to 25
Strength to Weight: Bending, points 18
20 to 22
Thermal Diffusivity, mm2/s 3.5
4.4
Thermal Shock Resistance, points 11
13 to 15

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.15
Chromium (Cr), % 19 to 23
17 to 19
Iron (Fe), % 44.9 to 57.8
67.3 to 74.9
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 23 to 27
8.0 to 10
Phosphorus (P), % 0 to 0.040
0 to 0.2
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0.15 to 0.35