Cr30Ni70 Resistance Strip Nickel Chromium Alloy For Heat Corrosion Resistance

Description

Cr30Ni70 resistance strip is a high-performance nickel-chromium alloy engineered for applications requiring exceptional thermal stability, oxidation resistance, and precise electrical performance in extreme environments. Composed of 68–72% nickel, 28–31% chromium, and trace elements (≤1.0% iron, ≤0.5% manganese), this alloy forms a robust chromium oxide (Cr₂O₃) layer at temperatures up to 1,250°C (2,282°F), ensuring long-term durability in oxidizing, carburizing, or sulfur-rich 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) guarantee stable energy output for precision heating in aerospace, nuclear, and semiconductor industries.

Certified to ASTM B344 and IEC 60172 standards, Cr30Ni70 strip delivers 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, high-frequency induction systems, and critical components requiring resistance to thermal fatigue and oxidation.

Technical Specifications (Table)

Applications

1. Aerospace: Heating elements for rocket thrusters, turbine sensors, and satellite thermal management.

2. Semiconductor Manufacturing: High-purity heating strips for diffusion furnaces and epitaxial reactors.

3. Nuclear Energy: Radiation-resistant components in reactor cores and fuel processing systems.

4. Industrial Furnaces: Vacuum sintering, brazing, and high-temperature annealing processes.

5. Energy Research: Superconducting magnet coils and fusion reactor instrumentation.

Q&A

Q1: What distinguishes Cr30Ni70 from lower-nickel alloys like Cr20Ni80?
A: Cr30Ni70’s higher nickel content enhances oxidation resistance and thermal stability above 1,200°C, ideal for extreme environments.

Q2: Can Cr30Ni70 operate in hydrogen-rich or vacuum environments?
A: Yes. Its low outgassing rate and resistance to hydrogen embrittlement make it suitable for vacuum furnaces and hydrogen applications.

Q3: Does this alloy comply with RoHS and REACH regulations?
A: Absolutely. Cr30Ni70 meets global regulatory standards for use in electronics, medical devices, and aerospace systems.