1. Product Core

Graphite Inconel Wire Packing uses high-purity expanded graphite (with a carbon content of ≥ 99.5%) as its substrate, uniformly embedded with Inconel alloy wires (mainstream models: Inconel 625/825, high-temperature corrosion-resistant nickel-based alloys). It is manufactured into high-performance sealing packing through the process of "graphite pretreatment → alloy wire weaving and positioning → multi-axis winding compounding → high-temperature curing and shaping". Its core value lies in integrating the excellent sealing and chemical corrosion resistance of graphite with the high strength, creep resistance, and high-temperature oxidation resistance of Inconel alloy wires. This addresses the industry pain points of traditional pure graphite packing-such as easy breakage and short sealing life-under "high-temperature, high-pressure + dynamic friction" conditions (e.g., power plant boilers, chemical reactors), and provides a long-term, reliable solution for extreme sealing scenarios.

2. Technical Parameters

3. Core Features

Superior Structural Strength and Creep Resistance: Inconel alloy wires (diameter: 0.15~0.3mm) are uniformly distributed at a volume fraction of 15%~25%, enabling the packing to achieve a tensile strength of ≥ 18MPa (80% higher than pure graphite packing) and a creep rate of ≤ 0.5%/1000h (under 200°C/15MPa operating conditions). It is less prone to plastic deformation under long-term high-temperature compression, preventing increased sealing gaps and subsequent leakage.

Wide-Range Temperature Resistance and Oxidation Resistance: It withstands temperatures from -200°C to 800°C in air (the anti-oxidation coating on Inconel alloy wires inhibits high-temperature oxidation) and from -200°C to 1200°C in inert atmospheres (nitrogen/argon)-far exceeding the temperature limit of pure graphite packing (≤ 600°C in air). This makes it suitable for high-temperature scenarios such as supercritical boilers and aircraft engine auxiliary systems.

Excellent Sealing and Corrosion Resistance: Graphite Inconel Wire Packing has a compression rate of 30%~45%, a rebound rate of ≥ 18%, and a dynamic sealing leakage rate of ≤ 0.05ml/h (test medium: saturated steam at 150°C, pressure: 20 bar). The graphite substrate resists full-spectrum acids and alkalis (pH 0-14), organic solvents, and molten salt corrosion; the Inconel alloy wires resist chloride ion and sulfide corrosion (e.g., high-salt media in offshore oil and gas platforms), with no risk of material embrittlement.

Low Friction and Long Service Life: The packing surface is treated with a polytetrafluoroethylene (PTFE) micro-coating, reducing the friction coefficient to 0.12~0.15 (under dry friction conditions) and the shaft sleeve wear rate to ≤ 0.02mm/1000h. Under normal operating conditions, its service life reaches 12,000–18,000 hours-over 50% longer than traditional graphite packing-reducing equipment shutdowns for maintenance.

Broad Engineering Adaptability: Conventional cross-sectional specifications include square (3mm × 3mm ~ 50mm × 50mm) and circular (Φ3mm ~ Φ50mm), with support for customized irregular cross-sections (e.g., trapezoidal, wedge-shaped). The volume fraction of Inconel wires can be adjusted according to operating conditions (up to 30%), making it suitable for sealed chambers of different pressure levels (e.g., low-pressure valves, high-pressure reactors).

 

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4. Application Fields

Power Industry (Core Scenarios)

Thermal Power: Shaft seals for supercritical boiler feedwater pumps, flange seals for steam turbine condensers-Withstands high-temperature, high-pressure steam at 540°C/30MPa. The creep resistance of Inconel wires prevents long-term compression deformation of the packing, and its sealing life covers one major boiler overhaul cycle (approximately 18 months).

Nuclear Power: Seals for auxiliary pumps in nuclear island cooling systems (e.g., safety injection pumps)-Inconel 625 wires are radiation-resistant (γ-ray dose ≤ 10⁷Gy), and graphite resists boric acid solution corrosion. It complies with RCC-M nuclear-grade material standards, ensuring sealing reliability under nuclear safety conditions.

Petrochemical Industry & Oil/Gas Extraction

Chemical Industry: Seals for agitator shafts of high-temperature acid-base reactors (e.g., acetic acid synthesis reactors)-Resists corrosion from 280°C/12MPa acetic acid vapor, with a leakage rate controlled below 0.03ml/h to prevent toxic medium leakage and pollution.

Offshore Oil/Gas: Valve seals for subsea Christmas trees-Inconel 825 wires resist seawater chloride ion corrosion (no pitting after 1000 hours of immersion in 50°C seawater), and graphite resists crude oil and natural gas erosion, making it suitable for deep-sea high-pressure (≤ 40MPa) environments.

Aerospace & High-End Manufacturing

Aerospace: Seals for aircraft engine fuel pumps-Withstands temperature fluctuations from -50°C to 650°C. Inconel wires resist vibration fatigue (no wire breakage under 1000Hz vibration), ensuring stable engine operation under high-altitude conditions.

Metallurgy: Seals for flue valves in non-ferrous metal smelting furnaces (e.g., copper smelting converters)-Resists 800°C high-temperature flue gas and molten metal splashes, with a tear strength of ≥ 22MPa, preventing sealing failure and flue gas leakage at high temperatures.

General Industry & Specialized Fields

Pharmaceutical Industry: Door seals for high-temperature sterilization autoclaves-The graphite substrate meets FDA 21 CFR Part 177.2600 food-grade standards, with no additive leaching, complying with GMP clean production requirements.

Marine Industry: Seals for seawater cooling pumps of ship main engines-Inconel wires resist seawater corrosion, and graphite resists marine biological fouling. Its service life exceeds 20,000 hours, reducing maintenance needs during long-distance ship voyages.

5. Supplementary Explanation

Customization Services: We offer customized solutions such as special Inconel wire models (e.g., Inconel 718, which increases the creep resistance temperature to 850°C) and high-purity graphite (99.9%). Precision machining with a cross-sectional dimensional tolerance of ±0.05mm is supported, making it suitable for micro-sealing chambers (e.g., aerospace equipment).

Quality Certifications: The product has passed ISO 9001 Quality Management System Certification, ASME B16.20 Sealing Standard Certification, and SGS RoHS 2.0 Environmental Testing. Nuclear-grade models have obtained RCC-M and ASME BPVC III certifications. Comprehensive third-party test reports are available upon request.

Installation & Maintenance: During installation, specialized packing cutting tools are recommended (to avoid Inconel wire breakage), and the fit gap between the sealing chamber and the shaft sleeve should be controlled at 0.1–0.3mm. If slight leakage occurs after long-term use, sealing performance can be restored by appropriately tightening the gland (torque increment ≤ 5N·m), eliminating the need for full replacement.

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