DESCRIPTION RP graphite electrodes, referred to moulded columns of graphite, are used as the high temperature conductive material for electric arc furnaces. Regular power graphite electrodes are specified with allowable current density less than 17 A/cm2. The quality of the graphite electrode determines the productivity and cost of EAF steelmaking. As a manufacturer, we also provide UHP grade graphite electrodes and HP grade graphite electrodes for ultra high power or high power electric arc furnaces. In addition to being used in arc furnaces, graphite electrodes are also widely used in submerged arc furnaces and Ladle furnaces. FEATURE High current carrying capacity. Outstanding resistance to breakage. High resistance to oxidation and thermal shock. Good dimension stability, not easy to deform. High mechanical strength, low electrical resistance. High machining accuracy, good surface finishing. APPLICATION Graphite electrodes are widely used for production of alloy steels, metal and other nonmetallic materials, etc. SPECIFICATION Table 1: Technical Specification of RP Graphite Electrode Dia. Resistance Density Flexure Strength Elastic Modulus Ash Content CTE Current Load Current Density (inch) (≤, µΩ·m) (≥, g/cm3) (≥, MPa) (≤, GPa) (≤, %) (100 °C – 60 °C) (A) (A/cm2) (≤, 10-6/°C) 8 8.0 1.58 10.0 9.3 0.5 2.9 5000–6900 15–21 9 8.0 1.58 8.5 9.3 0.5 2.9 6100–8600 15–21 10 8.0 1.58 8.5 9.3 0.5 2.9 7000–10000 14–20 12 8.0 1.58 8.5 9.3 0.5 2.9 10000–13000 14–18 14 8.0 1.57 7.5 9.3 0.5 2.9 13500–18000 14–18 16 8.0 1.57 7.5 9.3 0.5 2.9 18000–23500 14–18 18 8.0 1.57 7.5 9.3 0.5 2.9 22000–27000 13–17 20 8.0 1.57 7.5 9.3 0.5 2.9 25000–32000 13–16 22 8.0 1.57 7.5 9.3 0.5 2.9 32000–40000 13–16 24 8.0 1.57 7.5 9.3 0.5 2.9 38000–47000 13–16 Table 2: Graphite Electrode Size & Tolerance Diameter (mm) Length (mm) Nominal Diameter Actual Diameter Nominal Length Tolerance Short Length (inch) (mm) (max.) (min.) (rough spot) 8 200 205 200 197 1600 ±100 -275 9 225 230 225 222 1600 10 250 256 251 248 1600/1800 12 300 307 302 299 1600/1800 14 350 357 352 349 1600/1800 16 400 409 403 400 1600/1800/2000/2200 18 450 460 454 451 1600/1800/2000/2200 20 500 511 505 502 1800/2000/2200/2400 22 550 562 556 553 1800/2000/2200/2400 24 600 613 607 604 2000/2200/2400 SURFACE QUALITY There should be less than two defects or holes on the electrode surface, the maximum size of which is mentioned in the below chart. There should be no transverse crack on the electrode surface. For the longitudinal crack, the length should be less than 5% of the electrode circumference and the width should be 0.3 mm to 1.0 mm. The width of black area on electrode surface should be less than 1/10 of the electrode circumference and the length should be less than 1/3 of the electrode. SpecificationDefect Dimension Nominal Diameter of Graphite Electrode (mm) 300–400 450–600 Diameter (mm) 20–40 30–50 (< 20 mm should be negligible) (< 30 mm should be negligible) Depth (mm) 5–10 10–15 (< 5 mm should be negligible) (< 10 mm should be negligible)