ASTM A369 Grade FP92 High-Chromium Steel
ASTM A369 grade FP92 is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the normalized and tempered condition.
It has a fairly low thermal conductivity among wrought alloy steels in the same category. In addition, it has a very high base cost and a very high electrical conductivity.
The graph bars on the material properties cards below compare ASTM A369 grade FP92 to: wrought alloy steels in the same category (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
210
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
19 %
Fatigue Strength
330 MPa 49 x 103 psi
Poisson's Ratio
0.28
Shear Modulus
76 GPa 11 x 106 psi
Shear Strength
440 MPa 64 x 103 psi
Tensile Strength: Ultimate (UTS)
710 MPa 100 x 103 psi
Tensile Strength: Yield (Proof)
490 MPa 71 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
590 °C 1100 °F
Melting Completion (Liquidus)
1490 °C 2710 °F
Melting Onset (Solidus)
1450 °C 2640 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
26 W/m-K 15 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
9.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
10 % IACS
Otherwise Unclassified Properties
Base Metal Price
11 % relative
Density
7.9 g/cm3 500 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
40 MJ/kg 17 x 103 BTU/lb
Embodied Water
89 L/kg 11 gal/lb
Common Calculations
PREN (Pitting Resistance)
14
Resilience: Ultimate (Unit Rupture Work)
120 MJ/m3
Resilience: Unit (Modulus of Resilience)
620 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
25 points
Strength to Weight: Bending
22 points
Thermal Diffusivity
6.9 mm2/s
Thermal Shock Resistance
19 points
Alloy Composition
Among alloy steels, the composition of ASTM A369 grade FP92 is notable for including tungsten (W) and zirconium (Zr). Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects. Zirconium is used to improve ductility.
| Fe | 85.8 to 89.1 | |
| Cr | 8.5 to 9.5 | |
| W | 1.5 to 2.0 | |
| Mo | 0.3 to 0.6 | |
| Mn | 0.3 to 0.6 | |
| Si | 0 to 0.5 | |
| V | 0.15 to 0.25 | |
| Ni | 0 to 0.4 | |
| C | 0.070 to 0.13 | |
| Nb | 0.040 to 0.090 | |
| N | 0.030 to 0.070 | |
| P | 0 to 0.020 | |
| Al | 0 to 0.020 | |
| S | 0 to 0.010 | |
| Ti | 0 to 0.010 | |
| Zr | 0 to 0.010 | |
| B | 0.0010 to 0.0060 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM A369: Standard Specification for Carbon and Ferritic Alloy Steel Forged and Bored Pipe for High-Temperature Service