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ASTM Grade HH Steel vs. ASTM Grade HT Steel

Both ASTM grade HH steel and ASTM grade HT steel are iron alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 77% of their average alloy composition in common.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 170
150
Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 11
4.6
Fatigue Strength, MPa 150
130
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 79
76
Tensile Strength: Ultimate (UTS), MPa 580
500
Tensile Strength: Yield (Proof), MPa 270
270

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Maximum Temperature: Corrosion, °C 440
400
Maximum Temperature: Mechanical, °C 1100
1010
Melting Completion (Liquidus), °C 1400
1390
Melting Onset (Solidus), °C 1360
1340
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
12
Thermal Expansion, µm/m-K 17
15

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
31
Density, g/cm3 7.7
8.0
Embodied Carbon, kg CO2/kg material 3.7
5.4
Embodied Energy, MJ/kg 53
76
Embodied Water, L/kg 180
190

Common Calculations

PREN (Pitting Resistance) 27
18
Resilience: Ultimate (Unit Rupture Work), MJ/m3 53
19
Resilience: Unit (Modulus of Resilience), kJ/m3 190
180
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 21
18
Strength to Weight: Bending, points 20
18
Thermal Diffusivity, mm2/s 3.8
3.2
Thermal Shock Resistance, points 12
12

Alloy Composition

Carbon (C), % 0.2 to 0.5
0.35 to 0.75
Chromium (Cr), % 24 to 28
15 to 19
Iron (Fe), % 52.9 to 64.8
38.2 to 51.7
Manganese (Mn), % 0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 11 to 14
33 to 37
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 2.5
Sulfur (S), % 0 to 0.040
0 to 0.040