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Commonly used valve welding rod usage methods
There are many different types and models of valve electrodes, and there are different options for different situations. The following small valves will introduce some commonly used valve welding rods to you:
D502 valve surfacing electrode, GB EDCr-A1-03:
D502 is a 1Cr13 valve surfacing electrode with titanium-calcium coating, which can be used for both AC and DC, and has good welding technology. The surfacing metal is 1Cr13 semi-ferritic high-chromium steel. The surfacing layer has the characteristics of air quenching. Generally, heat treatment is not required, and the hardness is uniform. It can also be annealed and softened at 750-800°C. When heated to 900-1000°C, it can be rehardened after air cooling or oil quenching. Uses: This is a general-purpose electrode for surfacing welding, which is used for surfacing welding shafts and valves of carbon steel or alloy steel whose working temperature is below 450°C.
D507 valve surfacing electrode conforms to GB EDCr-A1-15 Description: D507 is a 1Cr13 valve surfacing electrode with low hydrogen sodium coating, and adopts DC reverse connection. The surfacing metal is 1Cr13 semi-ferritic high-chromium steel. The surfacing layer has the characteristics of air quenching. Generally, heat treatment is not required, and the hardness is uniform. It can also be softened by annealing at 750-800°C. When it is heated to 900-1000°C, it can be rehardened after air cooling or oil quenching.Uses: This is a general-purpose electrode for surfacing welding, which is used for surfacing welding of carbon steel or alloy steel shafts andvalveWait.
D507Mo valve surfacing electrode, GB EDCr-A2-15:
D507Mo is a 1Cr13 valve type surfacing electrode with low hydrogen sodium coating. The surfacing metal is 1Cr13 semi-ferritic high-chromium steel. The surfacing layer has the characteristics of air quenching, and the surfacing metal has high medium temperature hardness, good thermal stability and erosion resistance. If it is used in conjunction with D577 electrode, it can obtain good anti-scratch performance. The surfacing welding process is simple, no preheating before welding, no heat treatment after welding, and DC reverse connection is adopted. Application: Used for surfacing welding sealing surface of medium-temperature and high-pressure globe valve whose working temperature is below 510℃. The sealing surface of the gate valve should use this welding rod together with the D577 welding rod (the above two kinds of welding rods should be used for the valve seat and the disc respectively). D507MoNb valve surfacing electrode conforms to GB EDCr-A1-15 description: D507MoNb is a 1Cr13 valve surfacing electrode with low hydrogen sodium coating, and it adopts DC reverse connection. , so the surfacing metal has good oxidation resistance and crack resistance. Uses: Used for surfacing welding of sealing surfaces of medium and low pressure valves with working temperature below 450°C.
D512 valve surfacing electrode, GB EDCr-B-03: D512 is a 2Cr13 valve surfacing electrode with titanium-calcium coating, AC and DC dual-purpose, and the welding process is good. The surfacing metal is 2Cr13 martensitic high chromium steel. The surfacing layer has the characteristics of air quenching, generally does not need heat treatment, and has uniform hardness. It can be softened by annealing at 750-800°C, and can be hardened again when heated to 950-1000°C by air cooling or oil quenching. Uses: D512 is a general-purpose electrode for surfacing welding. The surfacing layer is harder and more wear-resistant than D502, and it is more difficult to process. It is used for surfacing carbon steel or low alloy steel shafts, valves for superheated steam, and mixers. Paddle, screw conveyor blade, etc.
D516MA valve surfacing electrode, GB EDCrMn-A-16: D516MA is a high-chromium-manganese steel surfacing electrode with low-hydrogen potassium coating. The metal of the surfacing layer has good wear resistance, heat resistance, corrosion resistance and thermal crack resistance. The welding process is simple. The surfacing layer can be machined without heat treatment. Uses: Used for surfacing welding parts under the action of water, steam and petroleum media with working temperature below 450℃, such as No. 25 cast steel, sealing surface of medium and high pressure valves.
D517 valve surfacing electrode, GB EDCr-B-15: D517 is a 2Cr13 valve surfacing electrode with low hydrogen and sodium coating, and it adopts DC reverse connection. The surfacing metal is 2Cr13 martensitic high chromium steel. The surfacing layer has the characteristics of air quenching, generally does not need heat treatment, and has uniform hardness. It can be softened by annealing at 750-800°C, and can be hardened again when heated to 950-1000°C by air cooling or oil quenching. Uses: D517 is a general-purpose electrode for surfacing welding. The surfacing layer is harder and more wear-resistant than D502, and it is more difficult to process. It is used for surfacing carbon steel or low alloy steel shafts, valves for superheated steam, and mixers. Paddle, screw conveyor blade, etc.
D547 valve surfacing electrode, GB EDCrNi-A-15: D547 is a CrNiSi type valve surfacing electrode with low hydrogen sodium coating and alloy steel core, which adopts DC reverse connection. The surfacing metal is strengthened by silicon to obtain an austenite structure with certain ferrite, so that it has good properties such as scratch resistance, corrosion resistance and oxidation resistance. Application: Used for surfacing welding of valve sealing surfaces and other sealing parts of high-pressure boiler devices in power stations that work below 570 °C.
D547Mo Valve Surfacing Electrode, GB EDCrNi-B-15: D547Mo is a CrNiSiMo valve surfacing electrode with low hydrogen sodium coating. Use DC reverse connection. The surfacing metal has good high-temperature anti-scratch and anti-erosion properties, high high-temperature hardness, good thermal stability and fatigue resistance. The aging strengthening effect of surfacing welding metal is remarkable. With the increase of aging time, the hardness and anti-scratch performance are further improved. Uses: Used for surfacing welding of sealing surfaces of high-pressure valves whose working temperature is lower than 600°C.
D557 valve surfacing electrode, GB EDCrNi-C-15: D557 is a CrNiSi valve surfacing electrode with low-hydrogen sodium coating. The surfacing metal is strengthened by a large amount of silicon to obtain an austenitic ferrite structure. With the increase of aging time, the hardness and scratch resistance have further improved. Improve, the surfacing metal has good anti-corrosion, anti-oxidation and anti-corrosion properties, and adopts DC reverse connection. Uses: Used for surfacing welding of sealing surfaces of high-pressure valves whose working temperature is lower than 600°C.
D577 valve surfacing electrode, GB EDCrMn-C-15: D577 is a chromium manganese valve surfacing electrode with low hydrogen sodium coating and alloy steel core. DC reverse connection is adopted, and the surfacing metal is high-chromium-manganese austenitic steel, so the effect of cold work hardening is remarkable, it has good anti-scratch performance, certain medium-temperature hardness, and good thermal stability. For example, it can be combined with D507Mo Use, can get very good anti-scratch performance, the electrode crack resistance is good, the surfacing welding process is simple, the electrode does not need to be preheated, no heat treatment is required after welding, and the surfacing welding metal cutting performance is good. Uses: It is used for the sealing surface of medium-temperature and high-pressure valves whose surfacing working temperature is below 510°C. If it is used in conjunction with D507Mo in gate valves, the service life will be longer. Instructions for the use of valve surfacing electrodes: Execution of GB984-2001 standard surfacing is a welding process that deposits a layer of wear-resistant, corrosion-resistant, heat-resistant metal layers on the surface or edge of the workpiece. It has significant economic benefits for repairing and improving the service life of parts, rationally using materials, improving product performance and reducing costs. Surfacing welding work and working conditions are very complicated, and suitable welding rods must be selected according to different requirements during surfacing welding. Different workpieces and surfacing electrodes require different surfacing processes to obtain satisfactory surfacing results.
After reading the above content, do you know how to use these commonly used valve electrodes? Continue to pay attention to Baival.com, there will be more useful dry goods~
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