D502 valve surfacing electrode in line with GB EDCr-A1-03 Description: D502 is titanium calcium type 1Cr13 valve welding electrode, AC and DC can be used, the welding process is good. Surfacing metal is 1Cr13 semi-ferritic high-chrome steel. Surfacing layer with air quenching properties, generally do not need heat treatment, hardness uniformity, can also be annealed at 750-800 ℃ softening, when heated to 900-1000 ℃ air cooling or oil quenching, can be re-hardened. Uses: This is a universal electrode for surfacing, used for surfacing working temperature below 450 ℃ carbon steel or alloy steel shaft and valves. D507 valve surfacing electrode in line with GB EDCr-A1-15 Description: D507 is a low hydrogen sodium type 1Cr13 valve surfacing electrode, the use of DC reverse. Surfacing metal is 1Cr13 semi-ferritic high-chrome steel. Surfacing layer with air quenching properties, generally do not need heat treatment, hardness uniformity, can also be annealed at 750-800 ℃ softening, when heated to 900-1000 ℃ air cooling or oil quenching, can be re-hardened. Uses: This is a universal electrode for surfacing, used for surfacing working temperature below 450 ℃ carbon steel or alloy steel shaft and valves. D507Mo valve surfacing electrode in line with GB EDCr-A2-15 Description: D507Mo is a low hydrogen sodium type 1Cr13 valve type surfacing electrode. Surfacing metal is 1Cr13 semi-ferritic high-chrome steel. Surfacing layer with air quenching properties, surfacing metal has a high temperature hardness, good thermal stability, erosion resistance. If used with the D577 electrode can get good anti-galling performance. Surfacing process is simple, no preheating before welding, welding without heat treatment, the use of DC reverse. Uses: used to build welding temperature below 510 ℃ in the high temperature pressure valve sealing surface. Gate valve sealing surface should be used in conjunction with the electrode and D577 (valve seat and the valve were used above two kinds of welding rod). D507MoNb valve surfacing electrode in line with GB EDCr-A1-15 Description: D507MoNb is a low hydrogen sodium type 1Cr13 valve welding electrode, the DC reverse connection, due to the coating to join the amount of Mo, Nb and other strengthening and stable elements , So surfacing metal has good oxidation resistance and crack resistance. Uses: Used for working temperature below 450 ℃, medium and low pressure valve sealing surface surfacing. D512 valve surfacing electrode in line with GB EDCr-B-03 Description: D512 is titanium calcium type 2Cr13 valve surfacing electrode, AC and DC, welding process is good. Surfacing metal 2Cr13 martensitic high-chromium steel. Surfacing layer with air quenching properties, generally do not need heat treatment, uniform hardness, annealed at 750-800 ℃ softening, when heated to 950-1000 ℃ air cooling or oil quenching can be re-hardened. Uses: D512 is a universal electrode for surfacing, which is harder and more wear-resistant than D502 and harder to process for surfacing carbon steel or low-alloy steel shafts, overheated steam valves, mixers Paddle, screw conveyor blades and so on. D516MA valve surfacing electrode in line with GB EDCrMn-A-16 Description: D516MA is a low hydrogen potassium type coating of high chromium manganese steel surfacing electrode, surfacing metal has good wear resistance, heat resistance, corrosion resistance and thermal cracking Performance, welding process is simple, without preheating before welding, heat treatment without welding, surfacing layer can be machined. Uses: For surfacing working temperature below 450 ℃ by water, steam, petroleum medium under the action of components, such as 25 cast steel, high pressure valve sealing surface. D517 valve surfacing electrode in line with GB EDCr-B-15 Description: D517 is a low hydrogen sodium type 2Cr13 valve welding electrodes, using DC reverse. Surfacing metal 2Cr13 martensitic high-chromium steel. Surfacing layer with air quenching properties, generally do not need heat treatment, uniform hardness, annealed at 750-800 ℃ softening, when heated to 950-1000 ℃ air cooling or oil quenching can be re-hardened. Uses: D517 is a versatile electrode for surfacing, which is harder and more wear-resistant than D502 and harder to machine for surfacing carbon steel or low-alloy steel shafts, overheated steam valves, mixers Paddle, screw conveyor blades and so on. D547 valve surfacing electrode in line with GB EDCrNi-A-15 Description: D547 is a low hydrogen sodium type coating, alloy steel core CrNiSi-type valve surfacing electrode, the use of DC reverse. Surfacing metal relies on silicon for strengthening, to obtain a certain ferrite austenite, so that it has good resistance to scratches, corrosion, oxidation and other properties. Uses: For the welding of work below 570 ℃ high pressure boiler plant valve sealing surface and other sealing parts. D547Mo valve surfacing electrode in line with GB EDCrNi-B-15 Description: D547Mo is a low hydrogen sodium type CrNiSiMo valve welding electrodes. DC reverse. Surfacing metal has good high temperature anti-scratch, erosion and other properties, high temperature hardness, good thermal stability and fatigue resistance. Overlaying metal aging effect is significant, with the aging time increases, the hardness and abrasion resistance to further improve. Uses: Used for the working temperature of less than 600 ℃ high pressure valve sealing surface surfacing. D557 valve surfacing electrode in line with GB EDCrNi-C-15 Description: D557 is a low hydrogen sodium type CrNiSi valve welding electrodes, surfacing metal relying on a large number of silicon to strengthen, get austenitic + ferrite, with With the growth of aging time, hardness and anti-abrasion properties have been further improved, surfacing metal has good corrosion resistance, oxidation resistance and corrosion resistance, the use of DC reverse. Uses: Used for the working temperature of less than 600 ℃ high pressure valve sealing surface surfacing. D577 valve surfacing electrode in line with GB EDCrMn-C-15 Description: D577 is a low hydrogen sodium type coating, alloy steel chromium-manganese-based valve surfacing electrode. Adopt DC reverse, the surfacing metal is high Cr-Mn-austenitic steel, so the cold-hardening effect is remarkable, with good anti-galling performance, a certain medium temperature hardness, good thermal stability, such as with the D507Mo Use, get good anti-galling performance, the electrode crack resistance, surfacing process is simple, the electrode can not be preheated, no heat treatment after welding, surfacing metal machining performance is good. Uses: Used for surfacing welding temperature below 510 ℃ in the high temperature valve sealing surface, such as in the valve with the D507Mo used, the service life is higher. Valve surfacing electrode Instructions for use: Implementation of GB984-2001 standard surfacing is the surface or edge of the workpiece for welding a layer of wear-resistant, corrosion resistance, heat resistance and other properties of the metal layer welding process. On the repair and improve the service life of parts, the rational use of materials, improve product performance, reduce costs have significant economic benefits. Surfacing work and working conditions are very complex, surfacing must be based on the different requirements of the appropriate selection of electrodes. Different workpieces and welding electrodes to use a different surfacing process, in order to obtain satisfactory surfacing effect. Surfacing is the most commonly encountered problems cracking, to prevent cracking of the main methods are: 1, preheating before welding, control the temperature between the layers, slow cooling after welding. 2, after welding stress relief heat treatment. 3, to avoid cracking when multi-layer surfacing, the use of low-hydrogen surfacing electrode. 4, if necessary, surfacing layer surfacing between the surfacing layer and the base metal (low carbon equivalent, high toughness of the electrode).