Low Hydrogen Electrodes
Crack-Resistant High Tensile Welding
Low hydrogen electrodes (E7018 type) are used for welding high-tensile and alloy steels where hydrogen-induced cracking must be avoided. They require pre-drying before use to maintain low moisture content.
Chemical Composition & Mechanical Properties
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| Electrode Type | C % | Mn % | Si % | S % Max | P % Max | Other Elements | Tensile Strength (N/mm²) | Yield Strength (N/mm²) | Elongation % | Impact (CVN) |
|---|---|---|---|---|---|---|---|---|---|---|
| Low Hydrogen Electrodes | ||||||||||
| E7015 | 0.10 max | 1.25 max | 0.90 max | 0.03 max | 0.03 max | Ni=0.30max, Cr=0.20max, Mo=0.30max, V=0.080max, Mn+Ni+Cr+Mo+V=1.50max | – | 400 min | 24-30 | 20°C 120-200J; 20°C 100-180J; -20°C 80-160J; -30°C 60-140J |
| E7016 | 0.10 max | 0.8-1.60 | 0.75 max | 0.03 max | 0.03 max | Ni=0.30max, Cr=0.20max, Mo=0.30max, V=0.080max, Mn+Ni+Cr+Mo+V=1.75max | 510-610 | 440-540 | 24-30 | 27°C 120-210J; 0°C 100-180J; -20°C 90-160J; -29°C 50-125J |
| E7016-1 | 0.10 max | 1.0-1.60 | 0.60 max | 0.025 max | 0.025 max | Cr=0.20 max, Ni=0.30 max, Mo=0.30 max, V=0.080 max, Mn+Ni+Cr+Mo+V=1.75max | 500 min | 400 min | 24 min | -46°C 90J |
| E7018 | 0.10 max | 0.8-1.60 | 0.75 max | 0.03 max | 0.03 max | Ni=0.30max, Cr=0.20max, Mo=0.30max, V=0.080max, Mn+Ni+Cr+Mo+V=1.50max | 510 min | 440 min | 24-30 | 20°C 120-200J; 0°C 100-180J; -20°C 80-160J; -30°C 60-140J |
| E7018-1 | 0.10 max | 1.0-1.60 | 0.45 max | 0.025 max | 0.025 max | Ni=0.30max, Cr=0.20max, Mo=0.30max, V=0.080max, Mn+Ni+Cr+Mo+V=1.50max | 500-600 | 440-540 | 24-30 | -46°C 50-150J; -50°C 50-120J |
| E7018-1 | 0.09 max | 0.90-1.40 | 0.15-0.50 | 0.012 max | 0.015 max | Ni=0.30max, Cr=0.20max, Mo=0.30max, V=0.080max, Mn+Ni+Cr+Mo+V=1.75max | 500-610 | 425-540 | 24-32 | -46°C 40-120J |
| E7024 | 0.04-0.12 | 0.45-0.85 | 0.25-0.45 | 0.035 max | 0.035 max | Ni=0.30 max, Cr=0.20 max, Mo=0.30 max, V=0.080 max | 500-600 | 430-520 | 22-28 | 0°C 48-88J |
| E7014 | 0.10 max | 1.25 max | 0.90 max | 0.03 max | 0.03 max | Ni=0.30 max, Cr=0.20 max, Mo=0.30 max, V=0.080 max | 510-600 | 430-500 | 22-28 | 0°C 47-88J |
Very low hydrogen content reduces cracking risk
High tensile strength weld deposits
Excellent impact resistance at low temperatures
Smooth, dense weld bead with minimal porosity
Suitable for critical structural applications
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