0Cr21Al4 Resistance Wire – Durable Fe-Cr-Al Alloy for Oxidation Resistance & Energy-Saving Heating

Description

0Cr21Al4 resistance wire is an iron-chromium-aluminum (Fe-Cr-Al) alloy designed for high-temperature electric heating applications, offering robust oxidation resistance, mechanical durability, and cost-effective performance. With a composition of 20–23% chromium, 4.5–6.5% aluminum, and balanced iron, this alloy forms a protective alumina (Al₂O₃) layer at temperatures up to 1,300°C (2,372°F), ensuring reliable operation in oxidizing and mildly corrosive environments such as industrial furnaces, household appliances, and automotive heating systems. Its low carbon content (≤0.08%) and controlled silicon (≤1.0%) minimize embrittlement, making it suitable for cyclic thermal operations where longevity and energy efficiency are critical.

Certified to GB/T 1234 and DIN 17470 standards, 0Cr21Al4 wire achieves a tensile strength of 550–700 MPa and a surface load capacity of 2.0 W/cm², outperforming conventional nickel-chromium alloys in cost-effectiveness for mid-range thermal applications. The alloy’s high electrical resistivity (1.30 μΩ·m) and low thermal expansion coefficient (14.5×10⁻⁶/°C) ensure stable energy output and dimensional stability, reducing operational costs in air or inert gas environments.

Technical Specifications (Table)

Applications

1. Industrial Furnaces: Heating elements for annealing, drying, and sintering processes.

2. Consumer Appliances: Oven coils, toasters, and electric space heaters.

3. Automotive: Seat warmers, defrosting systems, and exhaust gas heaters.

4. Agriculture: Livestock barn heaters and greenhouse climate control systems.

5. Energy Sector: Low-cost heating solutions for boilers and heat recovery units.

Q&A

Q1: What is the maximum continuous operating temperature for 0Cr21Al4 wire?
A: 1,200°C in continuous use and 1,300°C for short-term operations, ideal for applications requiring moderate thermal stress resistance.

Q2: Can this alloy withstand chlorine-rich atmospheres?
A: Limited resistance. For chlorine exposure above 800°C, consider higher-grade alloys like 0Cr27Al7Mo2.

Q3: Is pre-oxidation treatment necessary for optimal performance?
A: Yes. Heat-treat at 900–1,000°C for 1–2 hours to enhance the alumina layer and extend service life by 20–30%.