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 


 R407 heat-resistant steel electrode 
 R337 heat-resistant steel electrode 
 DC low hydrogen sodium metal chemical composition (%) Cr2.00-2.50Mo0.90-1.20 for welding Cr2.5Mo class (2.25CrMo etc.) pearlitic heat-resistant steel, such as below 550 ℃ high temperature and pressure pipe work , synthetic chemical machinery, petroleum cracking equipment. 
 Heat-resistant steel, low hydrogen electrode R427 DC for the welding temperature at 620 degrees Celsius below the 12Cr2MoWVB and other heat-resistant steel 
 Heat-resistant steel, low hydrogen electrode R507 DC metal chemical composition of sodium (%) Cr4.5-6.0Mo0.40-0.70 for pearlitic heat resistant steel welded Cr5Mo class. 400 ℃ high temperature, such as corrosion of the pipe out of hydrogen 
 Heat-resistant steel electrode R507B low hydrogen type DC welding Cr5Mo class pearlitic heat resistant steel, such as 400 degrees Celsius temperature hydrogen corrosion resistant pipes