GRAPHITE ELECTRODE NIPPLES – MATCH WITH UHP/HP/RP GRAPHITE ELECTRODES

Graphite electrode nipple is the accessory of the graphite electrode. It is used to connect the electrode bodies for the continuous use of electrodes. Graphite electrodes nipples are used to connect two or more electrodes into column. And the purpose of that is to realize continuous use of electrodes in electric arc furnace steelmaking process. Nipples, with conventional external threads surface, are the important clamping device to extend the electrode length. Doing this avoids the unproductive consumption in smelting. As a technical manufacturer, we know that the mismatch between the graphite electrode body and the nipple will lead to the electrode breaking during use. This not only just is an unproductive consumption in smelting, but also increases the amount of carbon in the molten steel. For these reasons, all electrode nipples are produced by our factory, not purchased.

Category:

Features


  • High bulk density, precision thread accuracy.
  • Check the tolerance of nipples one by one.
  • Bending strength limits are measured.
  • High machining accuracy, good surface finishing.
  • Outstanding resistance to breakage.
  • Original factory production, not outsourcing.

Specification


ItemResistanceDensityFlexure StrengthElastic ModulusAsh ContentCTE
(≤, µΩ·m)(≥, g/cm3)(≥, MPa)(≤, GPa)(≤, %)(100 °C – 600 °C)
(≤, 10-6/°C)
Regular power61.7215140.32.5
High Power51.7518180.32.2
Ultra High Power4.21.7820220.31.4

Dimensions of Nipple & Sockets (TPI 3)


Electrode Dia. Nipple DesignationNipple Socket  
Major Dia.LengthPitch Dia.DepthThread Length
(mm)(mm)(mm)(mm)(mm)
(inch)(mm)d1l1d4l2l3
9225139T3N139.7203.2135.49107.6103.6
10250155T3N155.57220151.36116112
12300177T3N177.16270.9172.95141.5137.5
14/16350/400215T3N215.9304.8211.69158.4154.4
14/16350/400215T3L215.9355.6211.69183.8179.8
16/18400/450241T3N241.3338.7237.09175.3171.3
16/18400/450241T3L241.3355.6237.09183.8179.8
20500273T3N273.05355.6268.84183.8179.8
20500273T3L273.05457.2268.84234.6230.6
22550298T3L298.45457.2294.24234.6230.6

* Pin pitch diameter d2 is equal to socket pitch diameter d4.
* Socket minor diameter d3 is equal to pitch diameter d4 minus 3.16 mm.
* Other combinations of nominal diameter and joint are to be agreed upon between the supplier and user.

Dimensions of Nipple & Sockets (TPI 4)


Electrode Dia. Nipple DesignationNipple Socket  
Major Dia.LengthPitch Dia.DepthThread Length
(mm)(mm)(mm)(mm)(mm)
(inch)(mm)d1l1d4l2l3
9225139T4N139.7177.8136.5494.990.9
10250152T4N152.4190.5149.24101.397.3
12300177T4N177.8215.9174.64114110
14350203T4N203.2254200.04133129
14350203T4L203.2304.8200.04158.4154.4
16400222T4N222.25304.8219.09158.4154.4
16400222T4L222.25355.6219.09183.8179.8
18450241T4N241.3304.8238.14158.4230.6
18450241T4L241.3355.6238.14183.8179.8
20500269T4N269.88355.6266.72183.8179.8
20500269T4L269.88457.2266.72234.6230.6
22550298T4N298.45355.6295.29183.8179.8
22550298T4L298.45457.2295.29234.6230.6
24600317T4N317.5355.6314.34183.8179.8
24600317T4L317.5457.2314.34234.6230.6

* Pin pitch diameter d2 is equal to socket pitch diameter d4.
* Socket minor diameter d3 is equal to pitch diameter d4 minus 3.16 mm.
* Other combinations of nominal diameter and joint are to be agreed upon between the supplier and user.

Standard Electrode Sizes & Nipple Weights


Electrode Standard Weight of Nipples       
Nominal Electrode SizeTPI 3TPI 4
Dia. × LT3NT3LT4NT4L
inchmmlbskglbskglbskglbskg
14 × 72350 × 18003214.5--24.311--
16 × 72400 × 180045.220.546.32135.31639.718
16 × 96400 × 240045.220.546.32135.31639.718
18 × 72450 × 180062.828.5753441.91948.522
18 × 96450 × 240062.828.5753441.91948.522
20 × 72500 × 180079.43693.742.561.7287534
20 × 84500 × 210079.43693.742.561.7287534
20 × 96500 × 240079.43693.742.561.7287534
20 × 110500 × 270079.43693.742.561.7287534
22 × 84550 × 2100----73.433.394.843
22 × 96550 × 2400----73.433.394.843
24 × 84600 × 2100----88.240110.250
24 × 96600 × 2400----88.240110.250
24 × 110600 × 2700----88.240110.250

Coupling Torque Reference for Nipple & Electrode


Electrode Diameterinch891012141618202224
mm200225250300350400450500550600
Easing MomentN.m200–260300–340400–450550–650800–950900–11001100–14001500–20001900–25002400–3000

Below chart is the matching relationship between electric furnace capacity, transformer power load and electrode size.

Furnace CapacityInner Dia.Transformer Capacity (MVA)Electrode Dia.
tmRPHPUHPmm
103.3557.510300/350
153.6561012350
203.957.51215350/400
254.3101518400
304.6121822400/450
404.9152227450
505.2182530450
605.5202735500
706.8223040500
806.1253545500
1006.4274050500
1206.7304560550/600
1507355070600
1707.3-6080600
2007.6-70100600/700
2508.2--120700
3008.8--150700