Chemical Composition Of The Core Wire E7018
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Product Introduction
| Element | Content Range | Main Function |
|---|---|---|
| Carbon (C) | ≤0.12% | Low carbon reduces the hardening tendency of the weld and lowers the risk of hydrogen-induced cracking; excessive carbon will increase weld brittleness. |
| Manganese (Mn) | 1.00~1.60% | Key strengthening element: Improves weld strength and toughness; also acts as a deoxidizer to reduce oxygen content in the weld and enhance weld purity. |
| Silicon (Si) | 0.20~0.55% | Auxiliary deoxidizer: Combines with oxygen to form SiO₂ slag, reducing oxygen in the weld; also slightly increases weld strength, but excessive content leads to weld brittleness. |
| Phosphorus (P) | ≤0.035% | Harmful impurity: Tends to segregate at grain boundaries, causing weld hot cracking (solidification cracking), so its content must be strictly controlled. |
| Sulfur (S) | ≤0.035% | Harmful impurity: Combines with manganese to form MnS, increasing weld hot brittleness, so its content must also be strictly limited. |
| Nickel (Ni) | 0~0.50% (for some grades) | Optional additive: Improves the low-temperature toughness of the weld (e.g., E7018-A1/A2 grades, designed for low-temperature working conditions). |
| Chromium (Cr)/Molybdenum (Mo) | 0~0.30% (for some grades) | Optional additives: Molybdenum enhances the high-temperature strength and creep resistance of the weld (e.g., E7018-Mo grade, used in medium-temperature environments). |
| Iron (Fe) | Balance | The base metal of the core wire. |
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