# AWS ER80S-B6 or ER55S-B6 (S50280) Weld Metal

AWS ER80S-B6 is a weld metal formulated for joining alloy steels. Cited properties are appropriate for the post-weld heat treated (PWHT) condition. ER80S-B6 is the AWS designation for this material. S50280 is the UNS number. Older literature may refer to this material as ER502, but this is now discouraged.

It has a very high electrical conductivity and a fairly high base cost among alloy steel welding fillers.

The graph bars on the material properties cards below compare AWS ER80S-B6 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

0.29

Shear Modulus

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

Tensile Strength: Ultimate (UTS)

620 *MPa* 89 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

540 *MPa* 78 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

260 *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

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)

9.5 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

4.7 *% 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

71 *L/kg* 8.5 *gal/lb*

## Common Calculations

PREN (Pitting Resistance)

7.1

Resilience: Ultimate (Unit Rupture Work)

110 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

750 *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

11 *mm ^{2}/s*

Thermal Shock Resistance

18 *points*

## Alloy Composition

Fe | 90.6 to 94.7 | |

Cr | 4.5 to 6.0 | |

Mn | 0.4 to 0.7 | |

Mo | 0.45 to 0.65 | |

Ni | 0 to 0.6 | |

Si | 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