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ASTM Grade HT Steel vs. S21800 Stainless Steel

Both ASTM grade HT steel and S21800 stainless steel are iron alloys. They have 73% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ASTM grade HT steel and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
210
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 4.6
40
Fatigue Strength, MPa 130
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
75
Tensile Strength: Ultimate (UTS), MPa 500
740
Tensile Strength: Yield (Proof), MPa 270
390

Thermal Properties

Latent Heat of Fusion, J/g 310
340
Maximum Temperature: Corrosion, °C 400
410
Maximum Temperature: Mechanical, °C 1010
900
Melting Completion (Liquidus), °C 1390
1360
Melting Onset (Solidus), °C 1340
1310
Specific Heat Capacity, J/kg-K 480
500
Thermal Expansion, µm/m-K 15
16

Otherwise Unclassified Properties

Base Metal Price, % relative 31
15
Density, g/cm3 8.0
7.5
Embodied Carbon, kg CO2/kg material 5.4
3.1
Embodied Energy, MJ/kg 76
45
Embodied Water, L/kg 190
150

Common Calculations

PREN (Pitting Resistance) 18
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 19
250
Resilience: Unit (Modulus of Resilience), kJ/m3 180
390
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 18
27
Strength to Weight: Bending, points 18
24
Thermal Shock Resistance, points 12
17

Alloy Composition

Carbon (C), % 0.35 to 0.75
0 to 0.1
Chromium (Cr), % 15 to 19
16 to 18
Iron (Fe), % 38.2 to 51.7
59.1 to 65.4
Manganese (Mn), % 0 to 2.0
7.0 to 9.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 33 to 37
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.040
0 to 0.060
Silicon (Si), % 0 to 2.5
3.5 to 4.5
Sulfur (S), % 0 to 0.040
0 to 0.030