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EN 1.3956 Stainless Steel vs. ASTM A369 Grade FP21

Both EN 1.3956 stainless steel and ASTM A369 grade FP21 are iron alloys. They have 62% of their average alloy composition in common. There are 26 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 EN 1.3956 stainless steel and the bottom bar is ASTM A369 grade FP21.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 27
20
Fatigue Strength, MPa 240
160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
74
Tensile Strength: Ultimate (UTS), MPa 650
470
Tensile Strength: Yield (Proof), MPa 330
240

Thermal Properties

Latent Heat of Fusion, J/g 300
260
Maximum Temperature: Mechanical, °C 1080
470
Melting Completion (Liquidus), °C 1420
1470
Melting Onset (Solidus), °C 1380
1430
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Base Metal Price, % relative 22
4.0
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 4.8
1.8
Embodied Energy, MJ/kg 68
23
Embodied Water, L/kg 180
61

Common Calculations

PREN (Pitting Resistance) 34
6.2
Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
80
Resilience: Unit (Modulus of Resilience), kJ/m3 270
150
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 23
17
Strength to Weight: Bending, points 21
17
Thermal Shock Resistance, points 18
14

Alloy Composition

Carbon (C), % 0 to 0.060
0.050 to 0.15
Chromium (Cr), % 20.5 to 23.5
2.7 to 3.4
Iron (Fe), % 51.9 to 62.1
94.3 to 96.2
Manganese (Mn), % 4.0 to 6.0
0.3 to 0.6
Molybdenum (Mo), % 1.5 to 3.0
0.8 to 1.1
Nickel (Ni), % 11.5 to 13.5
0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
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 0.030
0 to 0.025
Vanadium (V), % 0.1 to 0.3
0