WCu70 / 70W30Cu Tungsten Copper Electrode Rod - GB/T 8320 & ASTM B702 Standard

Zhuzhou Jiuding Metal Technology Corp Ltd is a professional manufacturer and supplier of high-performance tungsten copper alloy products based in Zhuzhou, Hunan, China, famous as the capital of tungsten industry. We focus on R&D, production and customized processing of tungsten copper electrode rods, tungsten copper plates and electrical contact components. All our WCu70 tungsten copper electrode rods are strictly produced and inspected in compliance with GB/T 8320-2017 Chinese National Standard and ASTM B702 International Standard, ensuring fully consistent chemical composition, physical properties and dimensional accuracy with global industrial standards. With advanced vacuum infiltration powder metallurgy technology and complete quality testing systems, we provide stable, high-purity and low-loss tungsten copper electrode materials for global EDM machining, welding and power electrical industries.

Product Overview

WCu70 (70% Tungsten, 30% Copper, also named CuW70) tungsten copper electrode rod is a premium composite metal material sintered by high-precision powder metallurgy and vacuum infiltration processes. It perfectly combines the ultra-high temperature resistance, high hardness and arc erosion resistance of tungsten, as well as the excellent electrical conductivity, thermal conductivity and machinability of copper. Complying with dual GB/T 8320-2017 and ASTM B702 standards, this alloy maintains balanced mechanical and electrical performance, featuring low electrode loss, high dimensional stability and outstanding high-temperature oxidation resistance. It is the preferred electrode material for precision EDM machining, resistance welding, high-voltage switch arc extinguishing and high-end electronic heat dissipation applications.

Dual Standard Compliance (GB/T 8320-2017 & ASTM B702)

Our 70W30Cu tungsten copper rods implement dual certification of Chinese national standard and American industry standard, with standardized component tolerance and performance indicators to meet global procurement and industrial testing requirements:

• GB/T 8320-2017 (Chinese National Standard): Official national standard for copper-tungsten and silver-tungsten electrical contact alloys. The standard defines our product formal grade as CuW(70), specifying strict chemical composition tolerance, density, hardness, electrical conductivity, resistivity and mechanical strength indicators for tungsten-copper electrode materials. It is the authoritative manufacturing and inspection basis for industrial tungsten-copper electrode rods and electrical contact components in China.

• ASTM B702 (US Industry Standard): International universal standard for tungsten-copper alloy raw materials and finished products. It regulates unified dimensional tolerance, physical performance indicators and quality inspection criteria for W70Cu30 alloys, fully adapting to overseas high-end equipment matching, international procurement and export trade certification requirements.

GB/T 8320-2017 CuW(70) Standard Grade Specification

According to the official provisions of GB/T 8320-2017, CuW(70) is the standard formal grade for our 70W30Cu tungsten copper electrode rod. The standard clearly stipulates core performance parameters and impurity control standards, which are fully implemented in Jiuding Metal’s production and quality inspection:

• Standard Grade: CuW(70) (70% Tungsten, 30% Copper)

• Composition Tolerance: Tungsten 70%±2%, Copper 30%±2%, total impurity content ≤0.5%

• Standard Hardness: ≥ HB 175

• Standard Bending Strength: ≥ 790 MPa

• Standard Resistivity: ≤ 4.1 μΩ·cm

• Standard Electrical Conductivity: ≥ 42% IACS

• Standard Density: ≥ 13.8 g/cm³

Core Technical Specifications (Standard Compliant)

All technical parameters fully conform to GB/T 8320-2017 and ASTM B702 standards, with strict impurity control and stable comprehensive performance:

Key Product Features

• Dual Standard Compliance & Stable Performance: Produced in strict accordance with GB/T 8320-2017 and ASTM B702 dual standards, with precisely controlled alloy ratio and ultra-low impurity content. The internal structure is uniform and pore-free, ensuring consistent mechanical, electrical and thermal performance for long-term industrial use.

• Ultra-Low Erosion & Extended Service Life: High-tungsten formula provides excellent arc ablation resistance and anti-sticking performance. It effectively resists arc impact and high-temperature oxidation during EDM and welding processes, reducing electrode loss by 30% compared with ordinary pure copper electrodes.

• Balanced Electrical & Thermal Conductivity: Optimized 70/30 tungsten-copper ratio ensures stable discharge performance and rapid heat dissipation. It avoids thermal deformation and burnout under high-current continuous operation, maintaining high-precision machining stability.

• High Structural Strength & Dimensional Stability: Adopting vacuum infiltration sintering process, the product features high compactness and mechanical strength. It remains non-deformable and non-crackable in high-temperature and high-pressure working environments, meeting high-precision repeated processing requirements.

• Excellent Machinability & Customization: Integrates tungsten rigidity and copper ductility, supporting precision turning, grinding, cutting and drilling. We provide full-size non-standard customization to match various equipment and application scenarios.

Main Applications of tungsten copper alloy

With dual-standard qualified performance, our WCu70 tungsten copper electrode rods are widely used in high-precision and high-reliability industrial fields worldwide:

• Precision EDM Machining: Ideal electrode for mold steel, alloy steel and hard metal EDM processing, featuring low loss and high surface finish.

• Industrial Resistance Welding: Applied for spot welding and projection welding electrodes of auto parts, hardware and alloy components, with stable discharge and anti-adhesion effect.

• High-voltage Power Equipment: Used for arc-extinguishing contacts and conductive parts of 10kV vacuum circuit breakers, high-voltage switches and power distribution equipment.

• Aerospace & Electronic Heat Dissipation: High-efficiency thermal conductive structural parts for precision electronic devices and aerospace industrial equipment.

• Precision Conductive Components: Custom high-temperature resistant conductive rods for automated precision mechanical systems.

Manufacturing & Quality Assurance (Jiuding Metal)

As a professional tungsten copper alloy manufacturer in Zhuzhou, we adopt vacuum infiltration powder metallurgy process for all WCu70 products. We implement full-process quality control in line with GB/T 8320-2017 and ASTM B702 standards, including raw material screening, pressing, sintering, finishing and final inspection. Each batch of products is equipped with complete test reports covering density, hardness, conductivity, composition and dimensional tolerance. Third-party authoritative testing is supported, and all products meet global export quality standards.

Packaging & Global Shipping

To prevent oxidation, collision and deformation during transportation, all tungsten copper electrode rods are treated with anti-rust oil, wrapped with shockproof bubble film and packed in standard export cartons or wooden cases. We support global sea freight, air freight and international express delivery, providing flexible customized packaging and delivery solutions for standard and bulk orders to ensure safe and timely delivery worldwide.