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S21800 Stainless Steel vs. ASTM Grade HP Steel

Both S21800 stainless steel and ASTM grade HP steel are iron alloys. They have 64% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 40
5.1
Fatigue Strength, MPa 330
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
78
Tensile Strength: Ultimate (UTS), MPa 740
490
Tensile Strength: Yield (Proof), MPa 390
260

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Maximum Temperature: Corrosion, °C 410
440
Maximum Temperature: Mechanical, °C 900
1100
Melting Completion (Liquidus), °C 1360
1370
Melting Onset (Solidus), °C 1310
1330
Specific Heat Capacity, J/kg-K 500
480
Thermal Expansion, µm/m-K 16
16

Otherwise Unclassified Properties

Base Metal Price, % relative 15
34
Density, g/cm3 7.5
7.9
Embodied Carbon, kg CO2/kg material 3.1
5.8
Embodied Energy, MJ/kg 45
82
Embodied Water, L/kg 150
220

Common Calculations

PREN (Pitting Resistance) 19
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 250
21
Resilience: Unit (Modulus of Resilience), kJ/m3 390
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 26
25
Strength to Weight: Axial, points 27
17
Strength to Weight: Bending, points 24
17
Thermal Shock Resistance, points 17
11

Alloy Composition

Carbon (C), % 0 to 0.1
0.35 to 0.75
Chromium (Cr), % 16 to 18
24 to 28
Iron (Fe), % 59.1 to 65.4
29.2 to 42.7
Manganese (Mn), % 7.0 to 9.0
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 8.0 to 9.0
33 to 37
Nitrogen (N), % 0.080 to 0.18
0
Phosphorus (P), % 0 to 0.060
0 to 0.040
Silicon (Si), % 3.5 to 4.5
0 to 2.5
Sulfur (S), % 0 to 0.030
0 to 0.040