HP Graphite Electrode HP-NIPPLE
Grade
Choose for the threaded connecting pin: multiply impregnated and re-baked stock with much higher density, strength and lower resistivity than the electrode body.
Values for the HP-NIPPLE condition
Other HP Graphite Electrode tempers and conditions
HP Graphite Electrode is listed in 4 conditions; see the grade overview at HP Graphite Electrode.
- HP-550-600
- HP-450-500
- HP-300-400
- HP-NIPPLE
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
HP Φ550–600 mm electrode body | Large-diameter HP for big medium-power furnaces and submerged-arc/ore furnaces; slightly relaxed resistivity and strength limits because of the coarser green body. | — | 7 | — | — | 145 W/m·K |
HP-450-500Default HP Φ450–500 mm electrode body | Most widely traded HP size class for 50–90 t medium/high-power EAFs — the reference for HP price and property quotations. | — | 8 | — | — | 150 W/m·K |
HP Φ300–400 mm electrode body | Small/medium diameter HP electrode for 20–50 t medium-power EAF and ladle furnaces; tightest resistivity and strength limits of the HP family. | — | 8 | — | — | 155 W/m·K |
HP-NIPPLEThis page impregnated, high density | Choose for the threaded connecting pin: multiply impregnated and re-baked stock with much higher density, strength and lower resistivity than the electrode body. | — | 13 | — | — | 175 W/m·K |
What is HP Graphite Electrode HP-NIPPLE?
HP Graphite Electrode HP-NIPPLE is HP Graphite Electrode in the HP-NIPPLE grade — choose for the threaded connecting pin: multiply impregnated and re-baked stock with much higher density, strength and lower resistivity than the electrode body. HP Graphite Electrode HP-NIPPLE has a tensile strength of 13 MPa (1.89 ksi), weaker than 91% of ceramic grades. The elastic modulus is 16 GPa (2.32 Msi). HP Graphite Electrode HP-NIPPLE has a density of 1.78 g/cm³ (0.0643 lb/in³), lighter than 90% of ceramic grades. It melts at 3,650°C (6,602 °F). HP-450-500 is the default condition FabDigit quotes; HP-NIPPLE is available on request or by drawing note.
Advantages
- High service temperature — 3,000°C (5,432 °F), better than 100% of ceramic grades
- Conducts heat well — 175 W/m·K (101.1 BTU/hr·ft·°F), better than 95% of ceramic grades
- Easy to machine — 88/100, better than 92% of ceramic grades
- Lightweight — 1.78 g/cm³ (0.0643 lb/in³), better than 90% of ceramic grades
Limitations
- Low stiffness — 16 GPa (2.32 Msi), worse than 87% of ceramic grades
- Low fracture toughness — 1 MPa·√m (0.91 ksi·√in), worse than 84% of ceramic grades
HP Graphite Electrode HP-NIPPLE properties
Typical room-temperature values for HP Graphite Electrode HP-NIPPLE; 12 are specific to this condition. Other listed values are HP Graphite Electrode reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical3
HP Graphite Electrode HP-NIPPLE has a density of 1.78 g/cm³ (0.0643 lb/in³), lighter than 90% of ceramic grades. It melts at 3,650°C (6,602 °F).
Mechanical8
HP Graphite Electrode HP-NIPPLE has a tensile strength of 13 MPa (1.89 ksi), weaker than 91% of ceramic grades. The elastic modulus is 16 GPa (2.32 Msi).
Thermal5
HP Graphite Electrode HP-NIPPLE is rated for continuous service to 3,000°C (5,432 °F). It conducts heat at 175 W/m·K (101.1 BTU/hr·ft·°F), better than 95% of ceramic grades. Thermal expansion is 1.6 µm/m·K (0.889 µin/in·°F).
Electrical2
HP Graphite Electrode HP-NIPPLE has an electrical resistivity of 4.2×10⁻⁶ Ω·m.
Chemical & Environmental2
Corrosion resistance is very good (70/100), worse than 59% of ceramic grades.
Sustainability3
Producing a kilogram of HP Graphite Electrode HP-NIPPLE takes about 90 MJ of energy and emits 7 kg of CO₂ — less than 62% of ceramic grades. Typical recycled content is 5%.
Manufacturability2
HP Graphite Electrode HP-NIPPLE's machinability is excellent (88/100, better than 92% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with HP Graphite Electrode HP-NIPPLE
Is HP Graphite Electrode easy to machine?
Machines very easily dry with carbide or PCD tooling (no coolant, high speed, light feed); abrasive dust demands sealed enclosures and vacuum extraction, and edges chip readily.
Can HP Graphite Electrode be welded?
Not weldable — sections are joined by machined tapered 4TPI/3TPI threaded nipples with graphite cement, or bonded with carbonaceous adhesives.
Can HP Graphite Electrode be formed, bent or molded?
Produced only by extrusion of coke/pitch paste followed by baking, optional pitch impregnation and re-bake, then 2800–3000 °C graphitisation; no post-forming is possible.
What surface finishes work on HP Graphite Electrode?
Turned to size and thread-machined; optional antioxidant ceramic/aluminium-phosphate coating or SiC coating reduces side-wall oxidation loss in EAF service.
HP Graphite Electrode chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| ashGB/T 3079 HP: ash ≤ 0.3 % | ≤ 0.3 | 0.2 |
| Sfrom petroleum/needle coke; drives puffing behaviour | 0.05 – 0.5 | 0.2 |
| volatile matterafter graphitisation | ≤ 0.2 | 0.1 |
| Cfixed carbon after graphitisation | ≥ 99 (balance) | — |
HP Graphite Electrode HP-NIPPLE — frequently asked
What is HP Graphite Electrode HP-NIPPLE used for?
HP Graphite Electrode HP-NIPPLE is typically used for medium-power EAF, ferroalloy furnaces and resistance furnaces. In short: mid-range electrode grade; lower cost than UHP; 3000 °C non-oxidising service.
What is the tensile strength of HP Graphite Electrode HP-NIPPLE?
HP Graphite Electrode HP-NIPPLE has a typical tensile strength of 13 MPa (1.89 ksi) — weaker than 91% of ceramic grades. Strength varies by condition: see the 4 listed tempers.
Is HP Graphite Electrode HP-NIPPLE easy to machine?
Yes — machinability is rated excellent (88/100, better than 92% of ceramic grades). Machines very easily dry with carbide or PCD tooling (no coolant, high speed, light feed); abrasive dust demands sealed enclosures and vacuum extraction, and edges chip readily.
Can HP Graphite Electrode HP-NIPPLE be welded?
Not weldable — sections are joined by machined tapered 4TPI/3TPI threaded nipples with graphite cement, or bonded with carbonaceous adhesives.
What surface finishes work on HP Graphite Electrode HP-NIPPLE?
Turned to size and thread-machined; optional antioxidant ceramic/aluminium-phosphate coating or SiC coating reduces side-wall oxidation loss in EAF service.
Can HP Graphite Electrode HP-NIPPLE be formed, bent or molded?
Produced only by extrusion of coke/pitch paste followed by baking, optional pitch impregnation and re-bake, then 2800–3000 °C graphitisation; no post-forming is possible.
What is the maximum service temperature of HP Graphite Electrode HP-NIPPLE?
HP Graphite Electrode HP-NIPPLE is rated for continuous use to about 3,000°C (5,432 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- GB/T 3079 (High-power graphite electrodes) (2019)
- JIS R 7601 Testing methods for carbon and graphite materials — JSA (2019)
- ASM Engineered Materials Handbook Vol.4 — Ceramics and Glasses (carbon/graphite section) — ASM International (1991)
- Graphite electrode HP grade technical data (typical Chinese/Japanese producer sheets) — Fangda / Kaifeng / Tokai COBEX (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.