Description
【Metallurgical Engineering】
Nickel-base covered electrodes (SMAW / MMAW) are critical welding consumables for applications where austenitic stainless steels or carbon steels fail due to chloride stress corrosion cracking (SCC), severe pitting, or extreme temperature degradation. The weld metal deposit forms a single-phase face-centered cubic (FCC) austenite matrix.
To prevent hot cracking (micro-fissuring) in fully austenitic weld deposits, our proprietary flux coating introduces micro-alloying elements such as Niobium (Nb), Manganese (Mn), and Molybdenum (Mo) while strictly limiting harmful trace tramp elements (Sulfur S < 0.008%, Phosphorus P < 0.010%, Lead Pb, and Bismuth Bi). The resulting weld metal features refined grain boundaries with exceptionally high crack resistance and creep strength up to 1000°C.
Alloy Series & Technical Matrix
| Grade | AWS A5.11 / ISO Class | Tensile Rm (MPa) | Elong. A (%) | Ni (%) | Key Alloying Elements (%) | Primary Applications |
| Ni112 (Alloy 625) |
AWS ENiCrMo-3 ISO E-NiCr21Mo9Nb |
≥ 760 (Typ. 800) |
≥ 30 (Typ. 38) |
Bal. (≥55) |
Cr: 20.0-23.0 Mo: 8.0-10.0 Nb: 3.15-4.15 |
Inconel 625, 9% Ni cryogenic LNG steel, offshore cladding, FGD scrubbers. |
| Ni102 (Hastelloy C-276) |
AWS ENiCrMo-4 ISO E-NiMo16Cr15Fe6W4 |
≥ 690 (Typ. 750) |
≥ 25 (Typ. 35) |
Bal. | Cr: 14.5-16.5 Mo: 15.0-17.0 W: 3.0-4.5 |
Hastelloy C-276, wet chlorine, sulfuric/hydrochloric acid piping, pulp & paper. |
| Ni307 / Ni327 (Inconel 182/132) |
AWS ENiCrFe-3 ISO E-NiCr15Fe8Mn6 |
≥ 550 (Typ. 620) |
≥ 30 (Typ. 38) |
Bal. (≥59) |
Cr: 13.0-17.0 Mn: 5.0-9.5 Nb: 1.0-2.5 |
Inconel 600, nuclear reactor internals, dissimilar steel welding (SS to Carbon steel). |
| NiCu-7 (Monel Type) |
AWS ENiCu-7 ISO E-NiCu30Mn3Ti |
≥ 480 (Typ. 540) |
≥ 30 (Typ. 36) |
Bal. (≥62) |
Cu: 28.0-34.0 Mn: ≤ 4.0 Fe: ≤ 2.5 |
Monel 400/K-500, seawater piping, marine desalination, hydrofluoric acid units. |
| Ni-1 (Pure Nickel) |
AWS ENi-1 ISO E-Ni2041 |
≥ 410 (Typ. 460) |
≥ 20 (Typ. 28) |
≥ 92.0 | Ti: 1.0-4.0 C: ≤ 0.10 Fe: ≤ 0.75 |
Nickel 200/201, caustic soda evaporators, synthetic fiber equipment, clad steel. |
| ENiFe-CI (Cast Iron) |
AWS A5.15 ENiFe-CI Cast Iron Repair |
≥ 400 (Typ. 480) |
≥ 12 (Typ. 18) |
45 – 60 | Fe: Bal. C: ≤ 2.0 Si: ≤ 2.5 |
Ductile/nodular and gray cast iron repair, engine blocks, machine beds without preheat. |
Dimensions & Recommended Welding Currents
| Diameter | Length | Flat Position (1G) | Vertical / Overhead (3G/4G) | Packaging |
|---|---|---|---|---|
| Ø 2.5 mm (3/32″) | 300 mm / 350 mm | 50 – 75 A | 45 – 65 A | 2.5 kg Vac-Pac / 10 kg Master |
| Ø 3.2 mm (1/8″) | 350 mm | 75 – 110 A | 70 – 95 A | 5.0 kg Vac-Pac / 20 kg Master |
| Ø 4.0 mm (5/32″) | 350 mm / 400 mm | 110 – 150 A | 95 – 130 A | 5.0 kg Vac-Pac / 20 kg Master |
| Ø 5.0 mm (3/16″) | 400 mm | 150 – 195 A | Not Recommended (Flat/H only) | 5.0 kg Vac-Pac / 20 kg Master |
Key Engineering Advantages
【01 / Corrosion Defense】
1. Superior Resistance to Chloride SCC & Severe Acid Corrosion
Weld overlays and joints produced with ENiCrMo-3 / ENiCrMo-4 achieve Pitting Resistance Equivalent Numbers (PREN > 45-68), completely eliminating stress corrosion cracking in boiling seawater, sour gas (H2S/CO2), and high-chloride bleaching plants.
【02 / Cryogenic Reliability】
2. Outstanding Toughness down to -196°C Cryogenic Service
The fully austenitic nickel deposit does not undergo ductile-to-brittle transition (DBTT). In ENiCrMo-3 and ENiCrFe-3, average Charpy V-Notch impact energy exceeds 60-80 J at -196°C, making them the industry standard for 9% Ni steel LNG storage tanks and cryogenic transport systems.
【03 / Dissimilar Metal Capability】
3. High Dilution Tolerance in Dissimilar Metal Welding
Offers broad solubility for alloying elements from carbon steels, low-alloy steels, and stainless steels without forming brittle martensite or sigma-phase intermetallics in the fusion boundary, ensuring high structural integrity in nuclear and thermal power transition joints.
【04 / Field-Ready Packaging】
4. Moisture-Resistant Vacuum Packaging (Vac-Pac)
Packaged in hermetically sealed aluminum canisters (Vac-Pac) immediately after high-temperature baking. Welders can use electrodes directly on-site without re-drying for up to 8 hours after opening, reducing on-site oven management costs and downtime.
Target Industrial Applications
| Industry Sector | Critical Equipment & Joint Type | Recommended Grade & Benefit |
|---|---|---|
| LNG & Cryogenic Engineering | 9% Ni steel storage tanks, cryogenic pipe manifolds, liquid nitrogen vaporizers. | ENiCrMo-3 (Ni112): Guarantees high impact toughness (>60 J at -196°C) and defect-free multi-pass welds. |
| Chemical & Petrochemical | Hastelloy reactors, sulfuric/phosphoric acid piping, hydrocracker heat exchangers. | ENiCrMo-4 (Ni102) / ENi-1: Extreme resistance to pitting, crevice corrosion, and aggressive media. |
| Offshore & Marine Engineering | Monel seawater piping, propeller shafts, splash zone cladding, brine evaporators. | ENiCu-7: High resistance to biofouling, velocity cavitation, and marine atmospheric corrosion. |
| Power Generation & Nuclear | Reactor vessel safe-ends, boiler tube dissimilar welds (Ferritic to Austenitic steels). | ENiCrFe-3 (Ni307): Matches thermal expansion coefficients, prevents carbon migration at elevated temps. |
| Heavy Industry Maintenance | Cracked cast iron machine frames, pump housings, press cylinder heads, valve bodies. | ENiFe-CI: Excellent weldability on contaminated iron without preheating; fully machinable deposit. |
Quality Assurance & Compliance
• Certified Compliance: AWS A5.11 / ASME SFA-5.11, ISO 14172, ASME Section
• Full Chemical & NDT Testing: Core wire OES heat analysis + all-weld metal chemistry testing; 100% X-ray radiographic inspection (RT) and Charpy V-Notch impact testing.
• Diffusible Hydrogen Testing: Mercury / Gas Chromatography tested conforming to AWS A4.3 (Diffusible hydrogen < 4.0 ml/100g deposit).
• Full Traceability: Every single electrode is imprinted with its AWS classification; lot numbers permanently stamped on vacuum cans and master cartons.
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