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ASTM A369 Grade FP21 vs. S17700 Stainless Steel

Both ASTM A369 grade FP21 and S17700 stainless steel are iron alloys. They have 77% 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 ASTM A369 grade FP21 and the bottom bar is S17700 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
180 to 430
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20
1.0 to 23
Fatigue Strength, MPa 160
290 to 560
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 74
76
Shear Strength, MPa 300
740 to 940
Tensile Strength: Ultimate (UTS), MPa 470
1180 to 1650
Tensile Strength: Yield (Proof), MPa 240
430 to 1210

Thermal Properties

Latent Heat of Fusion, J/g 260
290
Maximum Temperature: Mechanical, °C 470
890
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1430
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 4.0
13
Density, g/cm3 7.8
7.7
Embodied Carbon, kg CO2/kg material 1.8
2.8
Embodied Energy, MJ/kg 23
40
Embodied Water, L/kg 61
150

Common Calculations

PREN (Pitting Resistance) 6.2
17
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
15 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 150
460 to 3750
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 17
42 to 59
Strength to Weight: Bending, points 17
32 to 40
Thermal Diffusivity, mm2/s 11
4.1
Thermal Shock Resistance, points 14
39 to 54

Alloy Composition

Aluminum (Al), % 0
0.75 to 1.5
Carbon (C), % 0.050 to 0.15
0 to 0.090
Chromium (Cr), % 2.7 to 3.4
16 to 18
Iron (Fe), % 94.3 to 96.2
70.5 to 76.8
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.8 to 1.1
0
Nickel (Ni), % 0
6.5 to 7.8
Phosphorus (P), % 0 to 0.025
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.025
0 to 0.030