R312 heat-resistant steel electrode 
 R310 heat-resistant steel welding rod, 
 R317 heat-resistant steel electrode characteristics and uses; R310 is a type of titanium oxide coated electrodes can be AC and DC, the weld has a good performance and resistance to cold plastic holes. R312 titanium calcium type electrode, mainly used to cover up the pipe welding. R317 is a low hydrogen type coated electrode, the use of DC power. Three electrodes are suitable for all position welding, preheating before welding to be 250-300 ℃, after welding, to go through 715-745 ℃ tempered. Can be used for welding temperature below 540 ℃ pearlitic heat-resistant steel. 

 R327 heat-resistant steel welding rod, 
 R337 heat-resistant steel electrode characteristics and uses; R327 is a heat-resistant steel with the pearlitic CrMoVM electrodes. R337 is the pearlite with CrMoV Nb heat-resisting steel electrodes. DC power supply, short arc operation, can be all-position welding, preheating before welding to be 250-300 ℃, after welding, to go through 715-745 ℃ tempered. Can be used for welding temperature below 570 ℃ 15CrMoV pearlitic heat resistant steel. 

 R340 heat-resistant steel electrode 
 Special type of DC used for welding at 620 degrees Celsius temperature pearlite 
 R347 heat-resistant steel low hydrogen type electrode for welding current at 620 degrees Celsius operating temperature pearlitic heat-resistant steel 
 R402 heat-resistant steel electrode with titanium calcium type AC-DC for the working temperature of 550 degrees Celsius below the high temperature and pressure pipe welding cover up after backing welding welding