RP Graphite Electrode

HP Graphite Electrode
July 12, 2019

Product Introduction

RP Graphite Electrode
Physical & Chemical Properties of RP Graphite Electrodes
Specification and allowable deviation of graphite electrode
Nominal Diameter Actual diameter Nominal

length

Allowable Deviation
Short feet length
mm inch Max Min mm Length Max Min
350 14 357 352 1800-2000-2100 ±100 -100 -275
400 16 409 403
450 18 460 454
500 20 511 505 2000-2100-2250-2400-2700 ±100 -100 -275
550 22 562 553
600 24 613 607
700 26 714 708 2400-2700 ±100 -100 -275
Surface Quality
1. the electrode surface defects or holes are not more than two places, and their dimensions do not exceed the following table.
2. there are no transverse cracks on the electrode surface and 0.3-1.0mm longitudinal cracks, the length of which is not greater than 5% of the circumferential length of the electrode, and the longitudinal crack width of the electrode is not less than the longitudinal crack of 0.3mm.
3. The area of the black skin on the electrode surface: the width is less than 1/10 of the circumferential length of the electrode, and the length is less than 1 / 3 of the electrode length.
Specification Defect size Nominal Diameter
350-400 450-600
Diameter 20-40(<20 excluded) 30-50(<30 excluded)
Depth 5-10(<5 excluded) 10-15(<10 excluded)
Recommended current load of RP Graphite Electrodes
Item Unit Nominal Diameter
350~400 450~500 350~450 500~600
YB/T4088-2000 Measured index
Electric resistivity Electrode μΩ·m 9.0 10.5 9.0 10.5 9.0 9.5
Nipple 8.5 8.5 6.5 6.5
Flexural strength Electrode Mpa 6.4 6.4 7.0 6.5
Nipple 13.0 13.0 13.0 13.0
Young’s modulus Electrode Gpa 9.3 9.3 8.0 8.0
Nipple 14.0 14.0 12.0 12.0
Bulk Density Electrode g/cm³ 1.58 1.52 1.60 1.60
Nipple 1.63 1.63 1.75 1.75
CTE
(100℃~ 600℃)
Electrode 10-6/℃ 2.9 2.9 2.8 2.8
Nipple 2.7 2.7 2.7 2.7
Ash Content % 0.5 0.5 0.5 0.5
Note: CTE and Ash Content is only for reference
Recommended current load of RP Graphite Electrodes
Nominal Dia. Allowable Current(A) Current Density(A/cm2)
mm inch
350 14 13500-18000 14-18
400 16 18000-23500 14-18
450 18 22000-27000 13-17
500 20 25000-32000 13-16
600 24 32000-40000 12-14