JY Extruded Graphite – QDZRT Graphite

Product Details

JY Series comprises extruded graphite grades manufactured by QDZRT Graphite. It is intended for rods, heating components, furnace structural parts, larger sections, and general industrial machining where forming direction and material orientation must be considered.

Each published JY numeric set comes from one extruded-grade source row. Endpoints from different source grades are not merged.

JY Series Specification & Grade Architecture

Grade	Bulk Density(g/cm³)	Resistivity(μΩ·m)	Grain Size	Flexural Strength(MPa)	Compressive Strength(MPa)	Thermal Conductivity(W/(m·K))	CTE(×10⁻⁶/K)	Ash
JY-T01	≥1.72 g/cm³	≤8.5 μΩ·m	Coarse	≥14 MPa	≥34 MPa	—	—	≤0.3%
JY-T02	≥1.72 g/cm³ 1.74 g/cm³ (Typical)	≤9.0 μΩ·m 8.5 μΩ·m (Typical)	≤0.8 mm	≥13.5 MPa 15.5 MPa (Typical)	≥32 MPa 38 MPa (Typical)	≥120 W/(m·K) 140 W/(m·K) (Typical)	≤2.8 ×10⁻⁶/K 2.4 ×10⁻⁶/K (Typical)	≤0.2% 0.10% (Typical)

Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch.

Standard Extruded Rod & Large Block Dimensions

Extruded graphite is formed by pushing plasticized green paste through shaping dies, making it the most cost-effective method for producing long cylindrical rods and substantial rectangular beams. Standard factory sizes include:

Format Type	Standard Size Ranges (mm)	Typical Supply State
Cylindrical Rods & Electrodes	Diameter: Φ100 mm to Φ1200 mm Length: 1000 mm to 3000 mm	Extruded logs, rough-turned rods, threaded pin connections
Square & Rectangular Beams	350 × 350 mm, 400 × 400 mm, 500 × 500 mm Length: up to 2500 mm	As-extruded billets, sawn blocks, slotted heater cages
Cut-to-Length Blanks	Cut per project length requirements	Minimizes material scrap and reduces overseas shipping tonnage

Material Anisotropy: Grain Direction & Engineering Orientation

The extrusion process naturally aligns the needle coke particles parallel to the extrusion axis. This creates distinct directional properties that engineers must take into account during equipment design:

Electrical Resistivity: Electrical resistivity along the longitudinal extrusion axis (With-Grain / WG) is typically 20% to 30% lower than across the diameter (Against-Grain / AG). Electrical design should account for the measured material direction and operating circuit.
Coefficient of Thermal Expansion (CTE): Thermal expansion is lower along the extrusion axis, providing superior longitudinal thermal shock stability during rapid heating and cooling cycles.
Flexural & Tensile Strength: Mechanical strength is notably higher parallel to the extrusion direction (WG), which should align with the primary load-bearing axis of structural parts.

Machining & Threading for High-Temperature Tooling

QDZRT Graphite provides comprehensive turning, milling, and threading capabilities for extruded graphite components:

Precision Threaded Connections: Machining of male/female threaded nipples and connection joints for continuous electrode columns and heating rods.
Slotted Heating Cages & Grid Elements: CNC milling of expansion slots for multi-zone vacuum furnace heating systems.
Heavy Structural Components: Turnkey fabrication of furnace hearth beams, charging rails, and metallurgical graphite ladles.

Typical Applications & Selection Guidance

Primary Industrial Applications

Graphite rods and larger extruded sections for thermal and chemical processing
Heating components, conductive rods, and furnace structural parts
General industrial machining and selected metallurgical tooling
Applications where electrical properties and material direction are specified together
Cathode blocks, electrolysis anodes, and chemical anti-corrosion linings

Supply Formats & Machining Inquiries

JY Series material can be supplied as extruded stock, cut blanks, or machined parts subject to the available grade and section. Because extrusion creates directional properties, drawings and property requirements should identify the important working direction where relevant.

Engineering Grade Selection Criteria

Provide the required section, length, application, density, electrical requirement, mechanical load, operating temperature/atmosphere, and machining drawing if available. QDZRT Graphite will confirm the appropriate JY specification and the available property combination before order.

Frequently Asked Questions (FAQ)

Q1: Why is grain orientation critical when designing extruded graphite heating elements?

Because extruded graphite is anisotropic, electrical resistivity is 20–30% lower parallel to the extrusion direction (With-Grain). Current-path orientation changes electrical resistance; thermal distribution and power demand must be verified for the specific element and circuit.

Q2: What is the maximum diameter of extruded graphite rods supplied by QDZRT Graphite?

QDZRT Graphite supplies extruded graphite rods ranging from Φ100 mm up to Φ1200 mm in diameter, with standard lengths up to 2500–3000 mm.

Q3: Can extruded graphite be supplied with male and female threaded connections?

Yes. QDZRT Graphite regularly machines male and female threaded connections (standard metric, UNC, or customized tapered electrode threads) for connecting heating elements and conductive rods seamlessly.