Classification and use of valve surfacing electrode

D502 valve surfacing electrode meets GBEDCr-A1-03
Description: D502 is a 1Cr13 type valve surfacing electrode of titanium calcium type coating, which can be used for both AC and DC, and the welding process is good. The surfacing metal is 1Cr13 semi-ferritic high chromium steel. The surfacing layer has air-quenching characteristics, generally does not require heat treatment, has uniform hardness, and can be annealed and softened at 750-800 ° C. After heating to 900-1000 ° C for air cooling or oil quenching, it can be hardened again.

Uses: This is a versatile electrode for surface surfacing, used for surfacing welding of carbon steel or alloy steel shafts and valves with operating temperatures below 450 °C.

D507 valve surfacing electrode meets GBEDCr-A1-15

Description: D507 is a 1Cr13 valve surfacing electrode with low hydrogen sodium type coating, which is reversed by DC. The surfacing metal is 1Cr13 semi-ferritic high chromium steel. The surfacing layer has air-quenching characteristics, generally does not require heat treatment, has uniform hardness, and can be annealed and softened at 750-800 ° C. After heating to 900-1000 ° C for air cooling or oil quenching, it can be hardened again.

Uses: This is a versatile electrode for surface surfacing, used for surfacing welding of carbon steel or alloy steel shafts and valves with operating temperatures below 450 °C.

D507Mo valve surfacing electrode conforms to GBEDCr-A2-15

Description: D507Mo is a 1Cr13 valve type surfacing electrode with low hydrogen sodium type coating. The surfacing metal is 1Cr13 semi-ferritic high chromium steel. The surfacing layer has air quenching characteristics, and the surfacing metal has high medium temperature hardness, good thermal stability and erosion resistance. If used in conjunction with D577 electrode, it can achieve good scratch resistance. The surfacing process is simple, no preheating before welding, no heat treatment after welding, and DC reverse connection.

Uses: Used to weld the medium temperature and high pressure stop valve sealing surface with working temperature below 510 °C. The sealing surface of the gate valve should be used with the D577 welding rod (the above two welding rods are used for the valve seat and the valve disc respectively). D507MoNb valve surfacing electrode meets GBEDCr-A1-15

Description: D507MoNb is a 1Cr13 type valve surfacing electrode with low hydrogen sodium type coating. It adopts DC reverse connection. Because the proper amount of Mo, Nb and other strengthening elements are added to the coating, the surfacing metal has good oxidation resistance. And crack resistance.

Uses: Used for surfacing welding of medium and low pressure valve sealing surfaces with working temperature below 450 °C.

D512 valve surfacing electrode meets GBEDCr-B-03

Description: D512 is a 2Cr13 valve surfacing electrode of titanium calcium type coating. It is used in both AC and DC, and the welding process is good. The surfacing metal is 2Cr13 martensitic high chromium steel. The surfacing layer has air-quenching characteristics, generally does not require heat treatment, has uniform hardness, and can be annealed and softened at 750-800 ° C. It can be re-hardened when heated to 950-1000 ° C for air cooling or oil quenching.

Uses: D512 is a versatile electrode for surface surfacing. The surfacing layer is harder and more wear-resistant than D502. It is difficult to process. It is used for surfacing carbon steel or low alloy steel shaft, superheated steam valve parts, mixer. Paddles, screw conveyor blades, etc.

D516MA valve surfacing electrode conforms to GBEDCrMn-A-16

Description: D516MA is a high-chromium manganese steel surfacing electrode with low hydrogen potassium type coating. The surfacing layer metal has good wear resistance, heat resistance, corrosion resistance and thermal crack resistance. The welding process is simple and does not preheat before welding. No heat treatment after welding, the surfacing layer can be cut.
Uses: Used for surfacing welding parts under the action of water, steam and petroleum medium below 450 °C, such as No. 25 cast steel, high and medium pressure valve sealing surface.

D517 valve surfacing electrode conforms to GBEDCr-B-15

Description: D517 is a 2Cr13 type valve surfacing electrode with low hydrogen sodium type coating, which adopts DC reverse connection. The surfacing metal is 2Cr13 martensitic high chromium steel. The surfacing layer has air-quenching characteristics, generally does not require heat treatment, has uniform hardness, and can be annealed and softened at 750-800 ° C. It can be re-hardened when heated to 950-1000 ° C for air cooling or oil quenching.

Uses: D517 is a versatile welding electrode for surface surfacing. The surfacing layer is harder and more wear-resistant than D502. It is difficult to process. It is used for surfacing carbon steel or low alloy steel shaft, valve parts for superheated steam, mixer. Paddles, screw conveyor blades, etc.



D547 valve surfacing electrode conforms to GBEDCrNi-A-15

Description: D547 is a low-hydrogen sodium type coating, alloy steel core CrNiSi type valve surfacing electrode, using DC reverse connection. The surfacing metal is strengthened by silicon to obtain an austenite structure with a certain ferrite, which has good anti-scratch, anti-corrosion and anti-oxidation properties.

Uses: Used to weld the valve sealing surface of the high-pressure boiler installation of the power station below 570 °C and other sealing parts.



D547Mo valve surfacing electrode conforms to GBEDCrNi-B-15

Description: D547Mo is a CrNiSiMo valve surfacing electrode with low hydrogen sodium type coating. Use DC reverse connection. Surfacing metal has good high temperature anti-scratch, anti-erosion and other properties, high temperature hardness, good thermal stability and fatigue resistance. The aging strengthening effect of the surfacing metal is remarkable, and the hardness and the scratch resistance are further improved as the aging time increases.

Uses: Used for surfacing welding of high pressure valve sealing surfaces with working temperature below 600 °C.



D557 valve surfacing electrode conforms to GBEDCrNi-C-15

Description: D557 is a CrNiSi type valve surfacing electrode with low hydrogen sodium type coating. The surfacing metal is strengthened by a large amount of silicon to obtain austenite + ferrite structure. With the increase of aging time, hardness and scratch resistance Further improvement, the surfacing metal has good corrosion resistance, oxidation resistance and corrosion resistance, and adopts DC reverse connection.

Uses: Used for surfacing welding of high pressure valve sealing surfaces with working temperature below 600 °C.



D577 valve surfacing electrode conforms to GBEDCrMn-C-15

Description: D577 is a low-hydrogen sodium type coating, alloy steel core chrome-manganese valve surfacing electrode. Adopting DC reverse connection, the surfacing metal is high chromium manganese austenitic steel, so the cold work hardening effect is remarkable, it has good anti-scratch performance, has certain medium temperature hardness, and good thermal stability, such as cooperation with D507Mo. It can obtain good anti-scratch performance. The welding rod has good crack resistance, the surfacing process is simple, the welding rod can be preheated, no heat treatment after welding, and the surfacing metal cutting performance is good.

Uses: It is used for the welding of medium temperature and high pressure valve sealing surface with working temperature below 510 °C. It can be used with D507Mo in gate valve for higher service life.
Instructions for use of valve surfacing electrode

Implementation of the GB984-2001 standard

Surfacing is a welding process in which a layer of wear-resistant, corrosion-resistant, heat-resistant metal is applied to the surface or edge of the workpiece. Significant economic benefits for repairing and improving the service life of parts, rational use of materials, improvement of product performance and cost reduction.

Surfacing work and working conditions are very complicated. When welding, it is necessary to select suitable welding rods according to different requirements. Different workpieces and surfacing electrodes should adopt different surfacing processes to achieve satisfactory surfacing results. The most common problem encountered in surfacing is cracking. The main methods to prevent cracking are:

1. Preheating before welding, control the temperature between layers, and slowly cool after welding.

2. Stress-relieving heat treatment after welding.

3. Avoid cracking during multi-layer surfacing, using low-hydrogen surfacing electrode.

4 If necessary, a transition layer (a welding rod with low carbon equivalent and high toughness) is deposited between the surfacing layer and the base metal.


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