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Graphite Electrode Nipple

graphite electrode nipple
Graphite electrode nipple is important for connecting electrodes in industrial EAF steelmaking processes. They conduct electricity, allowing current to flow through the electrodes. Graphite electrode nipple is available in various diameters and lengths, with the size and shape of the fitting depending on the application. The nipple must be carefully inspected for damage or wear and replaced if necessary. When the graphite electrode leaves the factory, the surface needs to be processed, and the two ends are turned into nipple holes with trapezoidal threads. Each electrode is equipped with a nipple.

 

Graphite electrode nipples come in two types: one is cylindrical, and the other is conical. Nowadays, conical nipples with RP, HP and UHP graphite electrodes are mainly used around the world.

Since the cross-sectional area of the graphite electrode nipples are smaller than that of the electrode to which it is connected, the material from which the nipple is produced has a compressive strength greater than that of the electrode to which it is connected and has a lower resistivity.

In EAF stellmaking process, with the burning of the lower graphite electrode, it is necessary to replace and connect new electrodes constantly. The function of the nipple is to complete the connection between the electrodes.

Connections of graphite electrode nipple

To improve the connection quality of graphite electrodes and prevent the loosening of nipples,  dig two grooves on the nipple along the longitudinal cross-cut thread and insert the asphalt pin on the nipple body. During EAF steelmaking, the temperature rises after electrify the graphite electrodes.

Then pitch will melt at a specific temperature. When the bitumen melts, it flows into the gap between the threaded nipple and the groove. As the temperature increases, the bitumen carbonizes. The result is that the threads of the teat and the teat hole are condensed into one piece. So this result reduces the loosening of the teat when graphite electrodes in electric arc furnace steelmaking production.

 

Graphite Electrode Nipples Size

                                                                                                                                                                                                                                                                      Unit: mm

 

Nominal

Diameter

International

Code according to IEC

 

Nipple

Middle

Diameter

D2/D2

 

Socket

Thread

pitch

Large

dia.

Length Small

dia.

Socket

depth

300 177T3N 177.16 270.90 172.95 168.73 141.50 8.47
350 215 T3N 215.90 304.80 211.69 207.47 158.40
400 215 T3N 215.90 304.80 211.69 207.47 158.40
400 241 T3N 241.30 338.70 237.09 232.87 175.30
450 241 T3N 241.30 338.70 237.09 232.87 175.30
450 273 T3N 273.05 355.60 268.84 264.62 183.80
500 273 T3N 273.05 355.60 268.84 264.62 183.80
500 298 T3N 298.45 372.60 294.24 290.02 192.20
550 298 T3N 298.45 372.60 294.24 290.02 192.20
300 177T4N 177.80 215.90 176.64 171.48 114.00 6.35
350 203 T4N 203.20 254.00 200.04 196.88 133.00
400 222 T4N 222.25 304.80 219.09 215.93 158.40
400 222 T4N 222.25 355.60 219.09 215.93 183.80
450 241 T4N 241.30 304.80 238.14 234.98 158.40
450 241 T4N 241.30 355.60 238.14 234.98 183.80
500 269 T4N 269.88 355.60 266.72 263.56 183.80
500 269 T4N 241.30 457.20 266.72 263.56 234.60

 

550 298 T4N 298.45 355.60 295.29 292.13 183.80
550 298 T4N 241.30 457.20 295.29 292.13 234.60
600 317 T4N 317.50 355.60 314.34 311.18 183.80
600 317 T4N 317.50 457.20 314.34 311.18 234.60
700 374 T4N 374.65 457.20 371.49 368.33 234.60
700 374 T4N 374.65 558.80 371.49 368.33 285.40

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