INE ELECTRODE E8018-B2 H4 3.2MM
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INE E8018-B2 H4 – Low Hydrogen Cr-Mo Alloy Steel Electrode (3.2mm)
Product Overview
The INE E8018-B2 H4 3.2MM is a premium low-hydrogen, iron powder coated electrode engineered for welding chromium-molybdenum (Cr-Mo) alloy steels used in high-temperature, high-pressure service applications. Classified under AWS A5.5 / ASME SFA-5.5 as E8018-B2, this electrode delivers a weld deposit with a nominal composition of 1.25% Chromium and 0.5% Molybdenum, making it ideal for petrochemical, power generation, and refinery piping systems that operate under elevated temperatures.
The "H4" designation indicates a controlled diffusible hydrogen level of 4 mL/100g of deposited weld metal or less, ensuring superior resistance to hydrogen-induced cracking (HIC) — a critical requirement for thick-section and crack-sensitive alloy steel welding.
Key Specifications
| Attribute | Detail |
|---|---|
| AWS Classification | E8018-B2 |
| Hydrogen Level | H4 (=4 mL/100g) |
| Diameter | 3.2mm (1/8") |
| Coating Type | Low Hydrogen, Iron Powder |
| Current Type | AC / DC+ (Reverse Polarity) |
| Alloy Content | 1.25% Cr, 0.5% Mo |
| Tensile Strength | = 80,000 psi (552 MPa) |
| Application | Cr-Mo steel, high-temp/high-pressure piping |
Key Features & Benefits
- Low Hydrogen H4 Rated – Minimizes risk of underbead and hydrogen-assisted cracking, ideal for thick, restrained, or high-carbon-equivalent joints.
- Excellent Creep Resistance – The 1.25Cr-0.5Mo deposit maintains strength and structural integrity at elevated service temperatures (commonly up to 550°C / 1000°F).
- Smooth, Stable Arc Characteristics – Iron powder coating improves deposition rate, arc stability, and reduces spatter for a cleaner weld bead.
- Excellent Weld Bead Appearance – Produces a smooth, uniform bead with easy slag removal and minimal post-weld cleanup.
- X-ray Quality Welds – Suitable for critical, code-required applications demanding radiographic-quality soundness.
- Versatile Positional Welding – Typically suited for flat and horizontal position welding (verify manufacturer datasheet for full positional capability).
Common Applications
- Power plant boiler tubes, headers, and steam piping
- Petrochemical and refinery process piping
- Pressure vessels operating at elevated temperatures
- Cr-Mo alloy steel pipe and fitting fabrication
- Oil & gas high-temperature service equipment
Recommended Welding Parameters (3.2mm)
Typical amperage range: 90–140 Amps (verify against manufacturer's technical data sheet for exact settings, polarity, and preheat/interpass temperature recommendations, as these vary based on base metal thickness and joint design).
Handling & Storage Recommendation
As a low-hydrogen electrode, proper storage is essential to maintain the H4 rating. Store in a holding oven at 100–150°C (212–300°F) after opening, and re-bake per manufacturer guidelines (typically 350–400°C) if exposure to ambient humidity exceeds the recommended limit.
