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S82121 Stainless Steel vs. ASTM Grade HD Steel

Both S82121 stainless steel and ASTM grade HD steel are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is S82121 stainless steel and the bottom bar is ASTM grade HD steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 28
9.1
Fatigue Strength, MPa 370
140
Poisson's Ratio 0.27
0.27
Shear Modulus, GPa 78
80
Tensile Strength: Ultimate (UTS), MPa 730
590
Tensile Strength: Yield (Proof), MPa 510
270

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Maximum Temperature: Corrosion, °C 430
460
Maximum Temperature: Mechanical, °C 1020
1100
Melting Completion (Liquidus), °C 1430
1410
Melting Onset (Solidus), °C 1380
1370
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 14
17
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 2.8
3.1
Embodied Energy, MJ/kg 40
45
Embodied Water, L/kg 150
180

Common Calculations

PREN (Pitting Resistance) 28
29
Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
44
Resilience: Unit (Modulus of Resilience), kJ/m3 660
180
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 26
21
Strength to Weight: Bending, points 23
20
Thermal Diffusivity, mm2/s 4.0
4.3
Thermal Shock Resistance, points 20
19

Alloy Composition

Carbon (C), % 0 to 0.035
0 to 0.5
Chromium (Cr), % 21 to 23
26 to 30
Copper (Cu), % 0.2 to 1.2
0
Iron (Fe), % 66.7 to 75.4
58.4 to 70
Manganese (Mn), % 1.0 to 2.5
0 to 1.5
Molybdenum (Mo), % 0.3 to 1.3
0 to 0.5
Nickel (Ni), % 2.0 to 4.0
4.0 to 7.0
Nitrogen (N), % 0.15 to 0.25
0
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.010
0 to 0.040