R707 heat-resistant steel welding electrode low hydrogen DC Cr9Mo heat pipes and other steel structures and superheater 
 R717 heat-resistant steel low hydrogen electrode for welding Cr9Mo DC superheater heat pipes and other steel structures and 
 R802 heat-resistant steel electrode with titanium calcium type DC welding temperature of 565 degrees Celsius below the heat-resistant steel Cr11MoV 
 R807 heat-resistant steel welding heat-resistant steel heat-resistant steel electrodes with low hydrogen electrode DC welding temperature below 565 degrees Celsius heat Cr11Mo steel, such as variable-level high-pressure gas turbine blades, etc. 
 R817 heat-resistant steel low hydrogen electrode DC Description: R817 is a low hydrogen sodium type coating Cr11MoNiVW heat-resistant steel electrodes. DCRP, the all-position welding. Welds should be based on structural features of the appropriate preheat and post weld heat treatment. 
 R827 heat-resisting steel electrodes with low hydrogen type DC welding temperature 565 degrees Celsius below the Cr11MoV, Cr11MoNiV thermal strength steel, such as superheater and steam pipeline, transmission-level high-pressure gas turbine blades, etc.