# 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 10 ^{6} psi*

Elongation at Break

25 *%*

Fatigue Strength

380 *MPa* 55 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Reduction in Area

56 *%*

Shear Modulus

74 *GPa* 11 *x 10 ^{6} psi*

Shear Strength

450 *MPa* 66 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

710 *MPa* 100 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

520 *MPa* 75 *x 10 ^{3} 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/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

1.8 *kg CO _{2}/kg material*

Embodied Energy

24 *MJ/kg* 10 *x 10 ^{3} 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/m ^{3}*

Resilience: Unit (Modulus of Resilience)

700 *kJ/m ^{3}*

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 *mm ^{2}/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