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ASTM A369 Grade FP1 Molybdenum Steel

ASTM A369 grade FP1 is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the stress relieved condition.

It has a very low electrical conductivity among wrought alloy steels in the same category. In addition, it has a very low tensile strength and a moderately low embodied energy.

The graph bars on the material properties cards below compare ASTM A369 grade FP1 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

130

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

20 %

Fatigue Strength

160 MPa 24 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

270 MPa 39 x 103 psi

Tensile Strength: Ultimate (UTS)

430 MPa 63 x 103 psi

Tensile Strength: Yield (Proof)

240 MPa 34 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

410 °C 760 °F

Melting Completion (Liquidus)

1470 °C 2670 °F

Melting Onset (Solidus)

1420 °C 2600 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

50 W/m-K 29 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.1 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.4 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.6 x 103 BTU/lb

Embodied Water

47 L/kg 5.6 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

75 MJ/m3

Resilience: Unit (Modulus of Resilience)

150 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

15 points

Strength to Weight: Bending

16 points

Thermal Diffusivity

13 mm2/s

Thermal Shock Resistance

13 points

Alloy Composition

Among alloy steels, the composition of ASTM A369 grade FP1 is notable for containing comparatively high amounts of manganese (Mn) and molybdenum (Mo). Manganese is used to improve hardenability, hot workability, and surface quality. There is some loss of ductility and weldability, however. Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties.

Iron (Fe) 97.8 to 99.06
Manganese (Mn) 0.3 to 0.8
Molybdenum (Mo) 0.44 to 0.65
Silicon (Si) 0.1 to 0.5
Carbon (C) 0.1 to 0.2
Phosphorus (P) 0 to 0.025
Sulfur (S) 0 to 0.025

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