EDM Graphite Grades

Each of our EDM graphite grades has been specifically designed for a targeted range of electrode applications, showcasing optimized performance attributes.

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With over 50 years of industry expertise, we have mastered the ideal combination of metallic removal rates, minimal electrode erosion, and superior surface finishes. Our EDM Electrode materials ensure remarkable total cost of ownership. We maintain stringent control over our manufacturing procedures, ensuring you receive consistent and reliable performance from batch to batch, and from year to year. Our knowledgeable application engineers are on hand to assist in selecting the right grade and optimizing machine settings to suit your specific needs.

Our range of graphite grades is offered in various forms, including billets, semi-finished rods, blocks, and plates. 

Graphite Electrode Soldering Iron

Graphite electrodes are essentially sharp graphite rods that serve as a conduit for electrical current, connected to a copper tube with a conveniently located plastic handle, typically made of PVC. It is essential for the handle to be positioned far enough away to avoid exposure to excessive heat that can lead to melting. However, PVC is perhaps the least ideal plastic for this purpose.

This innovative tool serves as a versatile sheet metal welder for nearly all metals, operating without the need for additional input material, unless using very thin rods. Unlike traditional electric arc welding, the melting of metal is performed by the graphite tip, which quickly glows bright white. The graphite is heated by the electric current, as it exhibits significantly greater resistance, thereby dissipating more energy into heat. Maintaining a sharp point on the graphite tip is crucial for two key reasons:

Firstly, a finer tip increases the point of contact between the material and the electrode, thus enhancing current resistance and achieving higher temperature levels. Conversely, if the tip is too thick, heat transfer is optimized from the tip to the soldering iron, resulting in energy loss that prevents the necessary temperature from being reached. Effective soldering relies on the concentration of electric power at the desired solder point; thus, all factors must be considered accordingly.

The process of achieving this functionality came together smoothly thanks to a friend's inventive idea regarding how to handle the Graphite electrode. The method involves making two longitudinal cuts on the edge of a tube, effectively dividing it into four equal segments. After removing two segments, the remaining tabs are rounded and adjusted to fit snugly around the bar. A brass nut is then tightened over the rod, securing it in place and ensuring effective electrical contact. This design simplifies the process of changing bars quickly while allowing for effective positioning.

Graphite electrodes are primarily employed in electric arc furnaces (EAF). They are currently the only product class capable of providing the high electrical conductivity and stamina needed to withstand the extreme heat generated in these processes. Additionally, graphite electrodes are utilized for steel refining in ladle furnaces and various other smelting applications. The types of graphite electrodes are classified into four categories: RP Graphite electrodes, HP Graphite electrodes, SHP Graphite electrodes, and UHP Graphite electrodes.

Diameter and length for all grades:

Diameter mm

Length mm

Nominal Diameter

Actual Diameter

Nominal Length

Allowance

mm

inch

Max

Min

mm

Standard

Short

200

8

205

200

± 100

-275

250

10

256

251

/

300

12

307

302

/

350

14

357

352

/

400

16

409

403

/

450

18

460

454

/

500

20

511

505

/

550

22

562

556

/

600

24

613

607

/

650

26

663

657

/

700

28

714

708

/

Machining Dimension of Electrode and Nipple

Applicable

Dia.

mm

IEC code

Nipple

Socket

Large Dia.

mm

Length

mm

Small Dia.

mm

Socket Depth

mm

UHP

SHP

HP

RP

250

155T3N

155.57

220.00

147.14

116.00

300

177T3N

177.16

270.90

168.73

141.50

350

215T3N

215.90

304.80

207.47

158.40

400

215T3N

215.90

304.80

207.47

158.40

400

241T3N

241.30

338.70

232.87

175.30

450

241T3N

241.30

338.70

232.87

175.30

450

273T3N

273.05

355.60

264.62

183.80

500

273T3N

273.05

355.60

264.62

183.80

500

298T3N

298.45

372.60

290.02

192.20

550

298T3N

298.45

372.60

290.02

192.20

550

UHP

SHP

HP

RP

200

122T4N

122.24

177.80

115.92

94.90

250

152T4N

152.40

190.50

146.08

101.30

300

177T4N

177.80

215.90

171.48

114.00

350

203T4N

203.20

254.00

196.88

133.00

400

222T4N

222.25

304.80

215.93

158.40

400

222T4L

222.25

355.60

215.93

183.80

450

241T4N

241.30

304.80

234.98

158.40

450

241T4L

241.30

355.60

234.98

183.80

500

269T4N

269.88

355.60

263.56

183.80

500

269T4L

269.88

457.20

263.56

234.60

550

298T4N

298.45

355.60

292.13

183.80

550

298T4L

298.45

457.20

292.13

234.60

600

317T4N

317.50

355.60

311.18

183.80

600

317T4L

317.50

457.20

311.18

234.60

650

355T4N

355.60

457.20

349.28

234.60

650

355T4L

355.60

558.8

349.28

285.40

700

374T4N

374.65

457.20

368.33

234.60

700

374T4L

374.65

558.80

368.33

285.40