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S40910 Stainless Steel vs. ASTM A369 Grade FP21

Both S40910 stainless steel and ASTM A369 grade FP21 are iron alloys. Both are furnished in the annealed condition. They have a moderately high 91% 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 S40910 stainless steel and the bottom bar is ASTM A369 grade FP21.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
140
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 23
20
Fatigue Strength, MPa 130
160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
74
Shear Strength, MPa 270
300
Tensile Strength: Ultimate (UTS), MPa 430
470
Tensile Strength: Yield (Proof), MPa 190
240

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Maximum Temperature: Mechanical, °C 710
470
Melting Completion (Liquidus), °C 1450
1470
Melting Onset (Solidus), °C 1410
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 26
41
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
4.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 2.0
1.8
Embodied Energy, MJ/kg 28
23
Embodied Water, L/kg 94
61

Common Calculations

PREN (Pitting Resistance) 11
6.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
80
Resilience: Unit (Modulus of Resilience), kJ/m3 94
150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 16
17
Strength to Weight: Bending, points 16
17
Thermal Diffusivity, mm2/s 6.9
11
Thermal Shock Resistance, points 16
14

Alloy Composition

Carbon (C), % 0 to 0.030
0.050 to 0.15
Chromium (Cr), % 10.5 to 11.7
2.7 to 3.4
Iron (Fe), % 85 to 89.5
94.3 to 96.2
Manganese (Mn), % 0 to 1.0
0.3 to 0.6
Molybdenum (Mo), % 0
0.8 to 1.1
Nickel (Ni), % 0 to 0.5
0
Niobium (Nb), % 0 to 0.17
0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.025
Titanium (Ti), % 0 to 0.5
0