# AWS ER80S-B8 or ER55S-B8 (S50480) Weld Metal

AWS ER80S-B8 is a weld metal formulated for joining alloy steels. Cited properties are appropriate for the post-weld heat treated (PWHT) condition. ER80S-B8 is the AWS designation for this material. S50480 is the UNS number. Older literature may refer to this material as ER505, but this is now discouraged.

It has a fairly high base cost among alloy steel welding fillers. In addition, it has a fairly high embodied energy and a fairly high electrical conductivity.

The graph bars on the material properties cards below compare AWS ER80S-B8 to: alloy steel welding fillers (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

Elastic (Young's, Tensile) Modulus

190 *GPa* 28 *x 10 ^{6} psi*

Elongation at Break

19 *%*

Poisson's Ratio

0.28

Shear Modulus

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

Tensile Strength: Ultimate (UTS)

630 *MPa* 91 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

530 *MPa* 76 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

270 *J/g*

Melting Completion (Liquidus)

1460 *°C* 2650 *°F*

Melting Onset (Solidus)

1410 *°C* 2580 *°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

8.1 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

9.3 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

6.5 *% relative*

Density

7.8 *g/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

28 *MJ/kg* 12 *x 10 ^{3} BTU/lb*

Embodied Water

89 *L/kg* 11 *gal/lb*

## Common Calculations

PREN (Pitting Resistance)

13

Resilience: Ultimate (Unit Rupture Work)

120 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

720 *kJ/m ^{3}*

Stiffness to Weight: Axial

14 *points*

Stiffness to Weight: Bending

25 *points*

Strength to Weight: Axial

22 *points*

Strength to Weight: Bending

21 *points*

Thermal Diffusivity

6.9 *mm ^{2}/s*

Thermal Shock Resistance

17 *points*

## Alloy Composition

Fe | 85.6 to 90.8 | |

Cr | 8.0 to 10.5 | |

Mo | 0.8 to 1.2 | |

Mn | 0.4 to 0.7 | |

Si | 0 to 0.5 | |

Ni | 0 to 0.5 | |

Cu | 0 to 0.35 | |

C | 0 to 0.1 | |

P | 0 to 0.025 | |

S | 0 to 0.025 | |

res. | 0 to 0.5 |

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

## Followup Questions

## Similar Alloys

## Further Reading

AWS A5.28: Specification for Low-Alloy Steel Electrodes and Rods for Gas Shielded Arc Welding

Welding Metallurgy, 2nd ed., Sindo Kou, 2003

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015