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).
| Fe | 91.4 to 95.6 | |
| Cr | 4.0 to 6.0 | |
| Mo | 0.44 to 0.65 | |
| Mn | 0 to 0.6 | |
| Si | 0 to 0.5 | |
| Ni | 0 to 0.5 | |
| C | 0 to 0.25 | |
| P | 0 to 0.040 | |
| 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