?? R307 heat-resistant steel electrode ????? comply with GB E5515-B2 ?? quite AWS E8015-B2 Description: Low hydrogen type pearlitic heat resistant steel electrodes, using DC reverse, all-position welding, welding the former must be preheated to 160 ℃ -250 degrees Celsius. Welding temperature below 520 ℃ Cr1% -Mo0.5% pearlitic heat resistant steel (such as 15CrMo, etc.) welding, such as boiler tubes, pressure vessels, oil refining equipment, etc., can also be used to weld steel 30CrMnSi. ? R307B heat-resistant steel electrode ???? comply with GB E5515-B2 ??? quite AWS E8015-B2 Description: Ultra-low hydrogen type low-alloy heat-resistant steel electrode, the deposited metal has excellent crack resistance and low-temperature toughness, using DC reverse, all-position welding, before welding to be preheated to 160 ~ 250 ℃. Soldering temperature below 520 ℃ heat-resistant low-alloy steels (eg 1Cr0.5Mo, 15CrMo, 1.25Cr-0.5Mo, etc.), such as the hydrogenation reactor, heat exchangers and other pressure vessels and boiler tubes, pressure vessel welding . ? R307H heat-resistant steel electrode ???? comply with GB E5515-B2 ??? quite AWS E8015-B2 Description:? Belong to the low-hydrogen electrodes, using DC reverse, short arc, can be all-position welding. Be preheated before welding weldment to 160 ~ 250 ℃, after welding shall be tempered. Welding temperature below 520 ℃ 1% Cr-0.5Mo (such as 15CrMo) heat-resistant steel, such as boiler tubes, pressure vessels, oil refining equipment, etc., can also be used to weld steel 30CrMnSi. ? R307BL heat-resistant steel electrode ???? comply with GB E5515-B2 ??? quite AWS E8015-B2 Description: a low-hydrogen electrodes, using DC reverse, short arc, can be all-position welding. Be preheated before welding weldment to 160 ~ 250 ℃, after welding shall be tempered. Deposited metal has a very low S, P impurity content, superior low-temperature impact toughness. Welding temperature below 520 ℃ 1% Cr-0.5Mo (such as 15CrMo) heat-resistant steel, such as boiler tubes, pressure vessels, oil refining equipment, etc., can also be used to weld steel 30CrMnSi. ? R317 heat-resistant steel electrode ???? comply with GB E5515-B2-V profile: low hydrogen sodium type coating Cr1% -Mo0.5% -V pearlitic heat resistant steel electrodes, using DC reverse, all-position welding, be preheated before welding to 250 ~ 300 ℃. Soldering temperature below 540 ℃ pearlitic heat-resistant steel (eg 12CrMoV), used as high temperature and pressure boiler pipes, oil cracking equipment, chemical machinery, welding and other high-temperature synthesis. ?? R337 heat-resistant steel electrode ???? comply with GB E5515-B2-VNb Description: low hydrogen sodium type coating CrMoVNb pearlitic heat resistant steel electrodes, using DC reverse, all-position welding, to be preheated before welding to 250 ~ 300 ℃. Soldering temperature below 570 ℃ of 15CrMoV pearlitic heat resistant steel. ? R347 heat-resistant steel electrode ???? comply with GB E5515-B2-VW Description: low hydrogen sodium type coating of CrMoVW pearlitic heat resistant steel electrodes, using DC reverse, all-position welding, to be preheated before welding 250 ~ 300 ℃. Welding for temperature below 620 ℃ corresponding pearlitic heat resistant steel