StarBlaze Prime 9015-B91
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
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- Pack Sizes: 2.5 Kg Pouch, 5 Kg Box
- Master Box: 20 Kg, 30 Kg, 40 Kg, Customisable packaging available on request
- Engineered for 9Cr–1Mo–V–Nb–N creep-resistant steels
- Radiographic-quality welds with refined bead appearance
- Reliable creep strength and ductility under high-pressure service
- Smooth slag detachment and easy arc re-ignition
- Stable, low-hydrogen formulation with ≤4 ml diffusible hydrogen
- Thermal and Nuclear Power Generation
- Petrochemical and Process Plants
- High-Pressure Steam Lines
- Turbine Components and Rotors
- Thermoelectric Facilities
- Manual Metal Arc Welding (MMA / SMAW)
- DC+ polarity only
- Suitable welding positions: PA, PB, PC, PF, PE
- Not recommended for vertical-up beyond PF unless otherwise qualified
- Base materials include:
• T91 (ASTM A213)
• F91 (ASTM A182)
• P91 (ASTM A335)
• Grade 91 (ASTM A387)
• X10CrMoVNb9-1 - PWHT requirement: 760°C for 2 hours (typical)
- Store dry; re-dry at 300–350°C for 1 hour before use
- Creep rupture strength matched to P91/F91 metallurgy
- Excellent long-term microstructural stability in service
Product Details
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 |
