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ASTM A369 Grade FP9 vs. AISI 334 Stainless Steel

Both ASTM A369 grade FP9 and AISI 334 stainless steel are iron alloys. Both are furnished in the annealed condition. They have 69% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP9 and the bottom bar is AISI 334 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
180
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 20
34
Fatigue Strength, MPa 160
150
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
77
Shear Strength, MPa 300
360
Tensile Strength: Ultimate (UTS), MPa 470
540
Tensile Strength: Yield (Proof), MPa 240
190

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Mechanical, °C 600
1000
Melting Completion (Liquidus), °C 1450
1410
Melting Onset (Solidus), °C 1410
1370
Specific Heat Capacity, J/kg-K 480
480
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
22
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 2.0
4.1
Embodied Energy, MJ/kg 28
59
Embodied Water, L/kg 87
170

Common Calculations

PREN (Pitting Resistance) 12
19
Resilience: Ultimate (Unit Rupture Work), MJ/m3 80
140
Resilience: Unit (Modulus of Resilience), kJ/m3 140
96
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 17
19
Strength to Weight: Bending, points 17
19
Thermal Shock Resistance, points 13
12

Alloy Composition

Aluminum (Al), % 0
0.15 to 0.6
Carbon (C), % 0 to 0.15
0 to 0.080
Chromium (Cr), % 8.0 to 10
18 to 20
Iron (Fe), % 87.1 to 90.3
55.7 to 62.7
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
19 to 21
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.5 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0.15 to 0.6