Cr30Ni70 Resistance Wire Oxidation Resistance For Critical Applications
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)
| Property | Value | Standard |
|---|---|---|
| Chemical Composition | Ni: 68–72%, Cr: 28–31%, Fe: ≤1.0% | ASTM B344, IEC 60172 |
| Mn: ≤0.5%, Si: ≤0.5%, C: ≤0.08% | DIN 17470 | |
| Mechanical Properties | Tensile Strength: 700–900 MPa | ASTM E8 |
| Elongation: ≥20% | ||
| Physical Parameters | Density: 8.6 g/cm³ | ISO 6892 |
| Melting Point: 1,400°C | ||
| Electrical Resistivity: 1.15 µΩ·m |
Applications
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Aerospace: Thermocouples, rocket engine igniters, and turbine blade sensors.
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Semiconductor Manufacturing: Diffusion furnaces and epitaxial reactor heating elements.
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Nuclear Energy: Reactor core instrumentation and radiation-resistant heating systems.
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Industrial Furnaces: High-vacuum sintering, annealing, and brazing processes.
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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.
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