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S21900 Stainless Steel vs. ASTM Grade HP Steel

Both S21900 stainless steel and ASTM grade HP steel are iron alloys. They have 64% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is S21900 stainless steel and the bottom bar is ASTM grade HP steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
140
Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 50
5.1
Fatigue Strength, MPa 380
130
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 78
78
Tensile Strength: Ultimate (UTS), MPa 710
490
Tensile Strength: Yield (Proof), MPa 390
260

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Maximum Temperature: Corrosion, °C 420
440
Maximum Temperature: Mechanical, °C 980
1100
Melting Completion (Liquidus), °C 1400
1370
Melting Onset (Solidus), °C 1350
1330
Specific Heat Capacity, J/kg-K 480
480
Thermal Conductivity, W/m-K 14
12
Thermal Expansion, µm/m-K 17
16

Otherwise Unclassified Properties

Base Metal Price, % relative 15
34
Density, g/cm3 7.7
7.9
Embodied Carbon, kg CO2/kg material 3.0
5.8
Embodied Energy, MJ/kg 43
82
Embodied Water, L/kg 160
220

Common Calculations

PREN (Pitting Resistance) 25
27
Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
21
Resilience: Unit (Modulus of Resilience), kJ/m3 380
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 26
17
Strength to Weight: Bending, points 23
17
Thermal Diffusivity, mm2/s 3.8
3.2
Thermal Shock Resistance, points 15
11

Alloy Composition

Carbon (C), % 0 to 0.080
0.35 to 0.75
Chromium (Cr), % 19 to 21.5
24 to 28
Iron (Fe), % 59.4 to 67.4
29.2 to 42.7
Manganese (Mn), % 8.0 to 10
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 5.5 to 7.5
33 to 37
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.5
Sulfur (S), % 0 to 0.030
0 to 0.040