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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.

Iron (Fe) 85.8 to 89.1
Chromium (Cr) 8.5 to 9.5
Tungsten (W) 1.5 to 2.0
Molybdenum (Mo) 0.3 to 0.6
Manganese (Mn) 0.3 to 0.6
Silicon (Si) 0 to 0.5
Vanadium (V) 0.15 to 0.25
Nickel (Ni) 0 to 0.4
Carbon (C) 0.070 to 0.13
Niobium (Nb) 0.040 to 0.090
Nitrogen (N) 0.030 to 0.070
Phosphorus (P) 0 to 0.020
Aluminum (Al) 0 to 0.020
Sulfur (S) 0 to 0.010
Titanium (Ti) 0 to 0.010
Zirconium (Zr) 0 to 0.010
Boron (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