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ASTM Grade HH Steel vs. S21640 Stainless Steel

Both ASTM grade HH steel and S21640 stainless steel are iron alloys. They have 84% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HH steel and the bottom bar is S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
230
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11
46
Fatigue Strength, MPa 150
320
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
78
Tensile Strength: Ultimate (UTS), MPa 580
740
Tensile Strength: Yield (Proof), MPa 270
350

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 440
490
Maximum Temperature: Mechanical, °C 1100
940
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1360
1380
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
15
Thermal Expansion, µm/m-K 17
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 20
17
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.7
3.6
Embodied Energy, MJ/kg 53
51
Embodied Water, L/kg 180
150

Common Calculations

PREN (Pitting Resistance) 27
26
Resilience: Ultimate (Unit Rupture Work), MJ/m3 53
280
Resilience: Unit (Modulus of Resilience), kJ/m3 190
300
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
27
Strength to Weight: Bending, points 20
23
Thermal Diffusivity, mm2/s 3.8
4.0
Thermal Shock Resistance, points 12
16

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.080
Chromium (Cr), % 24 to 28
17.5 to 19.5
Iron (Fe), % 52.9 to 64.8
63 to 74.3
Manganese (Mn), % 0 to 2.0
3.5 to 6.5
Molybdenum (Mo), % 0 to 0.5
0.5 to 2.0
Nickel (Ni), % 11 to 14
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.060
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.040
0 to 0.030