STARBLAZE PRIME 446L
AWS A5.4: E630-16
Valve Repair Specialist, Fully Machinable Deposits, High Strength Build-Up Electrode
A modern low heat input stainless steel electrode specially designed for repairing, joining, and rebuilding valves manufactured from 17-4 PH stainless steel, ASTM A564, AISI 630, and other precipitation-hardening stainless steels. StarBlaze PRIME 446L produces crack-free weld deposits with high tensile strength and controlled hardness, making it ideal for multi-layer build-up applications. The chrome-nickel-molybdenum-copper-niobium alloy weld metal offers excellent machinability with tungsten carbide tools, smooth fusion characteristics, nil spatter, and self-releasing slag.
Available Packs
Dimensions: 3.15 mm x 350 mm, 4.00 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
Designed for repair and build-up of 17-4 PH stainless steel components
Chrome-nickel-moly-copper-niobium alloy weld deposit
Low heat input welding characteristics
High tensile strength with controlled hardness
Fully machinable weld deposits
Machinable using tungsten carbide tools
Crack-free weld deposits
Soft fusion characteristics
Nil spatter operation
Self-releasing slag
Suitable for multi-layer build-up applications
Suitable for AC and DC+ polarity
Valve Manufacturing Industry
Oil & Gas Industry
Power Generation Plants
Petrochemical Industry
Process Equipment Manufacturing
Heavy Engineering Industries
Maintenance and Repair Workshops
Industrial Valve Refurbishment Facilities
Manual Metal Arc Welding (MMA/SMAW)
Valve repair and refurbishment
Build-up welding of valve seating areas
Joining precipitation-hardening stainless steels
Multi-layer weld build-up applications
Maintenance and reclamation welding
Designed for 17-4 PH stainless steel applications
Suitable for ASTM A564 components
Suitable for AISI 630 stainless steels
Controlled hardness enables multiple layer build-up operations
Post-weld stress relief treatment improves toughness of repaired components
Recommended for joining, repair, and rebuilding of industrial valves
Heat treatment condition for typical mechanical properties:
Solution treatment at 1025–1050°C for 1 hour followed by air cooling
Precipitation hardening at 610–630°C for 4 hours followed by air cooling
Keep electrodes dry and avoid condensation
Re-dry at 250–300°C for 1 hour if necessary
Product Details
Typical Chemical Composition (%)
| C | Si | Mn | Cr | Ni | S | P | Nb | Cu | Mo |
| 0.040 | 0.40 | 0.50 | 16.50 | 4.70 | 0.022 | 0.025 | 0.23 | 3.55 | 0.40 |
Typical Mechanical Properties (All Weld Metal)
| Tensile Strength Rm (N/mm²) | Elongation A5 (%) | Charpy Impact Value (ISO-V J -30°C) | Hardness |
| 950 | 18 | 20 | 280 – 310 BHN |
Recommended Welding Parameters
| Diameter (mm) | Amperage Range (A) |
| 3.15 | 80-100 |
| 4.00 | 110-140 |
