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ASTM Grade HH Steel vs. N08925 Stainless Steel

Both ASTM grade HH steel and N08925 stainless steel are iron alloys. They have 80% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HH steel and the bottom bar is N08925 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11
45
Fatigue Strength, MPa 150
310
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
80
Tensile Strength: Ultimate (UTS), MPa 580
680
Tensile Strength: Yield (Proof), MPa 270
340

Thermal Properties

Latent Heat of Fusion, J/g 310
300
Maximum Temperature: Corrosion, °C 440
420
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1360
1410
Specific Heat Capacity, J/kg-K 480
460
Thermal Conductivity, W/m-K 14
13
Thermal Expansion, µm/m-K 17
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 20
33
Density, g/cm3 7.7
8.1
Embodied Carbon, kg CO2/kg material 3.7
6.2
Embodied Energy, MJ/kg 53
84
Embodied Water, L/kg 180
200

Common Calculations

PREN (Pitting Resistance) 27
44
Resilience: Ultimate (Unit Rupture Work), MJ/m3 53
250
Resilience: Unit (Modulus of Resilience), kJ/m3 190
280
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
23
Strength to Weight: Bending, points 20
21
Thermal Diffusivity, mm2/s 3.8
3.5
Thermal Shock Resistance, points 12
15

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.020
Chromium (Cr), % 24 to 28
19 to 21
Copper (Cu), % 0
0.8 to 1.5
Iron (Fe), % 52.9 to 64.8
42.7 to 50.1
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
6.0 to 7.0
Nickel (Ni), % 11 to 14
24 to 26
Nitrogen (N), % 0
0.1 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.030