Cr30Ni70 Resistance Wire – Superior High-Temperature Stability & Oxidation Resistance for Critical Applications

Description

Cr30Ni70 resistance wire is a premium nickel-chromium alloy engineered for extreme environments requiring exceptional thermal stability, oxidation resistance, and mechanical durability. Composed of 68–72% nickel, 28–31% chromium, and trace elements (≤1.0% iron, ≤0.5% manganese), this alloy excels in temperatures up to 1,250°C (2,282°F), forming a robust chromium oxide (Cr₂O₃) layer that resists scaling, carburization, and sulfidation in aggressive atmospheres. Its ultra-low carbon content (≤0.08%) minimizes intergranular corrosion, while its high electrical resistivity (1.15 µΩ·m) and low temperature coefficient of resistance (TCR) ensure precise energy output in aerospace, nuclear, and industrial heating systems.

Certified to ASTM B344 and IEC 60172 standards, Cr30Ni70 wire achieves a tensile strength of 700–900 MPa and elongation ≥20%, outperforming conventional Ni-Cr alloys in cyclic thermal operations. With a melting point of 1,400°C and near-zero magnetic permeability, it is ideal for vacuum furnaces, semiconductor manufacturing, and high-frequency induction heating where precision and reliability are paramount.

Technical Specifications (Table)

Applications

1. Aerospace: Thermocouples, rocket engine igniters, and turbine blade sensors.

2. Semiconductor Manufacturing: Diffusion furnaces and epitaxial reactor heating elements.

3. Nuclear Energy: Reactor core instrumentation and radiation-resistant heating systems.

4. Industrial Furnaces: High-vacuum sintering, annealing, and brazing processes.

5. Energy Research: Fusion reactor components and superconducting magnet coils.

Q&A

Q1: What is the maximum continuous operating temperature for Cr30Ni70 in oxidizing environments?
A: 1,250°C in air or oxygen-rich atmospheres, with intermittent use up to 1,300°C.

Q2: Can Cr30Ni70 withstand chlorine-rich or sulfur-containing atmospheres?
A: Moderate resistance. For prolonged exposure, consider alloys with higher chromium or molybdenum content.

Q3: Does Cr30Ni70 comply with RoHS and REACH directives for electronics?
A: Yes. It meets global regulatory standards, ensuring safety in medical and electronic applications.

Wuxi Nickel New Material Co., Ltd. is a high-tech enterprise integrating the production, manufacturing, and research & development of specialty alloy materials. Located in Wuxi, Jiangsu Province, the company specializes in precision alloys, titanium alloys, high-temperature alloys, corrosion-resistant alloys, heat-resistant steels, nickel-based welding wires, and other specialty materials, with an annual production capacity of 5,000 tonnes. Our product range includes plates, bars, wires, and strips, which are widely used in industrial electric furnaces, power‐station boilers, petrochemical plants, aerospace, marine engineering, machinery, and electronic instrumentation. These materials are characterized by high electrical resistance, high‐temperature strength, corrosion resistance, wear resistance, and fatigue resistance. We can manufacture in compliance with national, industry, and international standards, and are also able to tailor products to meet specific customer requirements.
The company is committed to improving and enhancing its production infrastructure all year round, with a full range of production and processing equipment including vacuum smelting, hot processing, cold processing, and heat treatment. It also has various physical and chemical analysis testing facilities such as spectrometers to ensure product quality. The company has a high-quality R&D, production, and management team that is fully capable of meeting the complex requirements of the current market for material diversification, refinement, and functionalization. Our company is particularly skilled in developing and producing "specialized materials" that are suitable for the market and specific customer needs, which will be one of our company's characteristics. The company adheres to the business philosophy of "guided by market demand, driven by technological progress, and committed to optimizing and innovating materials to create greater value for customers", serving society and the market.