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AWS E90C-B9 or E55C-B9 Weld Metal

AWS E90C-B9 is a weld metal formulated for joining alloy steels. Cited properties are appropriate for the post-weld heat treated (PWHT) condition.

It has a very high base cost among alloy steel welding fillers. In addition, it has the lowest electrical conductivity and a very low thermal conductivity.

The graph bars on the material properties cards below compare AWS E90C-B9 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 10⁶ psi

Elongation at Break

18 %

Poisson's Ratio

0.28

Shear Modulus

75 GPa 11 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

710 MPa 100 x 10³ psi

Tensile Strength: Yield (Proof)

460 MPa 67 x 10³ 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

25 W/m-K 15 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

6.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

7.0 % relative

Density

7.8 g/cm³ 490 lb/ft³

Embodied Carbon

2.6 kg CO₂/kg material

Embodied Energy

37 MJ/kg 16 x 10³ BTU/lb

Embodied Water

91 L/kg 11 gal/lb

Common Calculations

PREN (Pitting Resistance)

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m³

Resilience: Unit (Modulus of Resilience)

550 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

6.9 mm²/s

Thermal Shock Resistance

20 points

Alloy Composition

Iron (Fe)Fe		84.4 to 90.9
Chromium (Cr)Cr		8.0 to 10.5
Molybdenum (Mo)Mo		0.85 to 1.2
Manganese (Mn)Mn		0 to 1.2
Nickel (Ni)Ni		0 to 0.8
Silicon (Si)Si		0 to 0.5
Vanadium (V)V		0.15 to 0.3
Carbon (C)C		0.080 to 0.13
Copper (Cu)Cu		0 to 0.2
Niobium (Nb)Nb		0.020 to 0.1
Nitrogen (N)N		0.030 to 0.070
Aluminum (Al)Al		0 to 0.040
Phosphorus (P)P		0 to 0.020
Sulfur (S)S		0 to 0.015
Residualsres.		0 to 0.5