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ASTM A182 Grade F5a (K42544) Steel

ASTM A182 grade F5a is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the normalized and tempered condition. F5a is the ASTM designation for this material. K42544 is the UNS number.

It has a fairly high ductility among wrought alloy steels in the same category. In addition, it has a fairly high electrical conductivity and a moderately high base cost.

The graph bars on the material properties cards below compare ASTM A182 grade F5a 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

310

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

25 %

Fatigue Strength

380 MPa 55 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

56 %

Shear Modulus

74 GPa 11 x 106 psi

Shear Strength

450 MPa 66 x 103 psi

Tensile Strength: Ultimate (UTS)

710 MPa 100 x 103 psi

Tensile Strength: Yield (Proof)

520 MPa 75 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

510 °C 950 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2590 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

8.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

4.5 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.8 kg CO2/kg material

Embodied Energy

24 MJ/kg 10 x 103 BTU/lb

Embodied Water

69 L/kg 8.2 gal/lb

Common Calculations

PREN (Pitting Resistance)

6.8

Resilience: Ultimate (Unit Rupture Work)

160 MJ/m3

Resilience: Unit (Modulus of Resilience)

700 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

25 points

Strength to Weight: Bending

23 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

20 points

Alloy Composition

Among alloy steels, the composition of ASTM A182 grade F5a is notable for containing a comparatively high amount of chromium (Cr). Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures).

Iron (Fe) 91.4 to 95.6
Chromium (Cr) 4.0 to 6.0
Molybdenum (Mo) 0.44 to 0.65
Manganese (Mn) 0 to 0.6
Silicon (Si) 0 to 0.5
Nickel (Ni) 0 to 0.5
Carbon (C) 0 to 0.25
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A182: Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service