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ASTM Grade HH Steel vs. S44725 Stainless Steel

Both ASTM grade HH steel and S44725 stainless steel are iron alloys. They have 86% of their average alloy composition in common. There are 32 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 S44725 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
180
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 11
22
Fatigue Strength, MPa 150
210
Poisson's Ratio 0.27
0.27
Shear Modulus, GPa 79
81
Tensile Strength: Ultimate (UTS), MPa 580
500
Tensile Strength: Yield (Proof), MPa 270
310

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Maximum Temperature: Corrosion, °C 440
500
Maximum Temperature: Mechanical, °C 1100
1100
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1360
1410
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
17
Thermal Expansion, µm/m-K 17
11

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
15
Density, g/cm3 7.7
7.7
Embodied Carbon, kg CO2/kg material 3.7
3.1
Embodied Energy, MJ/kg 53
44
Embodied Water, L/kg 180
170

Common Calculations

PREN (Pitting Resistance) 27
33
Resilience: Ultimate (Unit Rupture Work), MJ/m3 53
99
Resilience: Unit (Modulus of Resilience), kJ/m3 190
240
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 21
18
Strength to Weight: Bending, points 20
18
Thermal Diffusivity, mm2/s 3.8
4.6
Thermal Shock Resistance, points 12
16

Alloy Composition

Carbon (C), % 0.2 to 0.5
0 to 0.015
Chromium (Cr), % 24 to 28
25 to 28.5
Iron (Fe), % 52.9 to 64.8
67.6 to 73.5
Manganese (Mn), % 0 to 2.0
0 to 0.4
Molybdenum (Mo), % 0 to 0.5
1.5 to 2.5
Nickel (Ni), % 11 to 14
0 to 0.3
Niobium (Nb), % 0
0 to 0.26
Nitrogen (N), % 0
0 to 0.018
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 0.040
Sulfur (S), % 0 to 0.040
0 to 0.020
Titanium (Ti), % 0
0 to 0.26