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This group of electrodes has predetermined levels of Mo and Cr or both to provide weld metals with improved elevated temperature performance over that attainable with straight Carbon Manganese Alloyed steels.
The design features of the electrodes are closely related to those of the group High Tensile and Low Alloy Steels, eg: very low weld metal hydrogen levels and very low levels of non-metallic weld metal inclusions.
Within the scope of the specified weld metal analysis, the optimum ratio of weld metal Mn to Si ratio is achieved to guard against solidification cracking.
The hardenability of the higher alloyed types when welding thicker sections dictates that high pre-heat followed by the immediate recommended PWHT should be a mandatory feature of the weld procedure.
Should immediate PWHT not be possible, the component should not be allowed to cool below 150 ºC before PWHT commences.
In the case of RD-16B8 which deposits 9Cr-1Mo weld metal welded with a pre-heat of 200 – 350 ºC, an exception should be made, e.g.: after welding allow the weldment to cool gradually to 150 ºC and maintain at this temperature for two hours before PWHT to ensure a fully transformed martensitic microstructure.
| Type | AWS | Description | Datasheet | MSDS |
|---|---|---|---|---|
| RD-716A | AWS A5.5 E7016-A1 | Basic low hydrogen electrode for welding C-Mn-Mo steels operating up to 450ºC | No Content Available | No Content Available |
| RD-718A | AWS A5.5 E7018-A1 | Low hydrogen - iron powder electrode for welding creep resisting mo-containing ferritic steels operating up to 450ºC | No Content Available | No Content Available |
| RD-16B | AWS A5.5 E8016-B2 | Low hydrogen electrode for welding 1.25Cr-0.5Mo steels subjected to service at elevated temperatures up to 550 ºC | No Content Available | No Content Available |
| RD-16BV | AWS A5.5 E8016-B2 (mod.) | Low hydrogen electrode for welding 1.25Cr-0.5Mo-0.2V steels subjected to service at elevated temperatures up to 550 ºC | No Content Available | No Content Available |
| RD-18B | AWS A5.5 E8018-B2 | Low hydrogen - iron powder electrode for welding 1.25Cr-0.5Mo steels operating at elevated temperatures up to 550 ºC | No Content Available | No Content Available |
| RD-18B3L | AWS A5.5 E8018-B3L | Low hydrogen - low carbon electrode for welding special applications of 2.25Cr-1Mo steels | No Content Available | No Content Available |
| RD-96B3 | AWS A5.5 E9016-B3 | Low hydrogen - iron powder electrode for welding 2.25Cr-1Mo steels subjected to service at elevated temperatures | No Content Available | No Content Available |
| RD-502 | AWS A5.5 E8016-B6 | Basic coated low hydrogen electrode for welding 5Cr-0.5Mo steels in service at elevated temperatures up to 600ºC | No Content Available | No Content Available |
| RD-16B8 | AWS A5.5 E8016-B8 | Basic low hydrogen electrode for welding 9Cr-1Mo steels operating up to 600ºC | No Content Available | No Content Available |
| RD-16B9 | AWS A5.5 E9016-B9 | Basic low hydrogen electrode for welding modified 9Cr-1Mo steels operating at elevated temperatures up to 650ºC | No Content Available | No Content Available |
| RD-18B9 | AWS A5.5 E9018-B9 | Basic low hydrogen electrode for welding modified 9cr-1mo steels operating at elevated temperatures up to 650ºc | No Content Available | No Content Available |
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