STARBLAZE PRIME 9015 B9
AWS A5.5: E9015-B91 | EN ISO 3580-A: E CrMo91 B 4 2 H5
P91 Steel Welding, High Temperature Creep Resistance, Extra Low Hydrogen Electrode
A basic coated extra low hydrogen electrode specially designed for welding high-temperature creep resistant 9Cr-1Mo-V-Nb-N steels operating at temperatures up to +620°C. StarBlaze PRIME 9015-B9 provides excellent weldability, self-peeling slag, finely rippled weld beads, and radiographic quality weld deposits. The weld metal offers outstanding creep strength and elevated temperature performance, making it ideal for critical applications in power generation, petrochemical plants, and high-temperature pressure systems. It is specifically developed for welding P91, T91, and F91 steels used in modern thermal power and process industries.
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
Pack Sizes: 2.5 Kg Vacuum Pack, 4 Kg Box, 5 Kg Box
Master Box: 20 Kg, 30 Kg, 40 Kg, Customisable packaging available on request
Extra low hydrogen basic coating
Designed for 9Cr-1Mo-V-Nb-N steels
Suitable for service temperatures up to 620°C
Excellent creep resistance
Excellent weldability
Self-peeling slag
Finely rippled weld bead appearance
Radiographic quality weld deposits
Superior elevated temperature strength
Low diffusible hydrogen content (<4 ml/100g)
Excellent weld metal toughness
Suitable for DC+ polarity
Thermal Power Plants
Petrochemical Industry
Refinery Projects
Pressure Vessel Manufacturing
Boiler Fabrication
Steam Pipeline Construction
Turbine Manufacturing
Heavy Engineering Industries
Manual Metal Arc Welding (MMA/SMAW)
P91 steel welding
High temperature pressure piping fabrication
Boiler fabrication and repair
Steam line welding
Pressure vessel fabrication
Turbine component welding
Maintenance and repair welding
Designed for creep resistant 9Cr-1Mo-V-Nb-N steels
Suitable for ASTM A213 Grade T91
Suitable for ASTM A182 Grade F91
Suitable for ASTM A335 Grade P91
Suitable for ASTM A387 Grade 91
Suitable for EN Grade X10CrMoVNb9-1
Excellent choice for modern high-efficiency thermal power plants
Provides superior creep strength under prolonged elevated temperature service
Keep dry and avoid condensation
Re-dry electrodes at 300–350°C for 1 hour
Diffusible hydrogen less than 4 ml per 100g weld metal
Product Details
Typical 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 × 2 Hours | ≥ 550 | ≥ 650 | ≥ 18 | ≥ 47 |
Diffusible Hydrogen
| Property | Value |
| Diffusible Hydrogen (per 100g weld metal) | < 4 ml |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 2.50 | 60-90 |
| 3.15 | 90-120 |
| 4.00 | 140-180 |
| 5.00 | 180-220 |
