AWS A5.5: E9015-B91 | EN ISO 3580-A: E CrMo91 B 4 2 H5
For 9Cr–1Mo–V–Nb–N Weldments | Creep Rupture Reliability | Radiographic Finish
A basic coated, extra low hydrogen electrode formulated for high-temperature, creep-resistant steels such as 9Cr–1Mo–V–Nb–N alloys (e.g., Grade 91). Designed for use in high-pressure, high-temperature power piping and equipment, the electrode delivers a refined weld bead with minimal spatter and excellent arc stability. Welds are X-ray quality, offering superior strength and creep resistance up to +620°C. Ideal for thermoelectric and petrochemical applications.
Available Packs
Dimensions: 2.50 mm x 350 mm, 3.15 mm x 450 mm,4.00 mm x 450 mm, 5.00 mm x 450 mm
Typical Weld Metal Chemical Composition (%)
| C | Si | Mn | Cr | Mo | Ni | S | P | V | Nb | N |
| 0.10 | 0.20 | 0.60 | 9.00 | 1.00 | 0.60 | ≤ 0.010 | ≤ 0.010 | 0.20 | 0.050 | 0.04 |
Typical Mechanical Properties (All Weld Metal)
| Heat Treatment | Yield Strength
Rp (N/mm2) |
Tensile Strength
Rm (N/mm2) |
Elongation
A5 (%) |
Impact Energy
ISO-V(J) +20°C |
| PWHT 760°C x 2h | ≥ 550 | ≥ 650 | ≥ 18 | ≥ 47 |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 60-90 |
| 3.15 | 90-120 |
| 4.00 | 140-180 |
| 5.00 | 180-220 |
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