0Cr21Al6 Resistance Strip – Superior Oxidation Resistance & Energy Efficiency for Industrial Heating

Description

0Cr21Al6 resistance strip is an iron-chromium-aluminum (Fe-Cr-Al) alloy engineered for high-performance electric heating applications, combining exceptional oxidation resistance, mechanical stability, and cost efficiency. With a composition of 20–23% chromium, 5.5–7.0% aluminum, and balanced iron, this alloy forms a robust alumina (Al₂O₃) layer at temperatures up to 1,350°C (2,462°F), providing long-term protection against oxidation, carburization, and sulfurization in aggressive industrial atmospheres. Its low carbon content (≤0.08%) and controlled silicon (≤1.0%) minimize embrittlement, ensuring reliable performance in cyclic heating environments such as industrial furnaces, kilns, and household appliances.

Certified to GB/T 1234 and DIN 17470 standards, the 0Cr21Al6 strip achieves a tensile strength of 550–700 MPa and surface load capacity of up to 2.0 W/cm², making it ideal for heating elements in air, vacuum, or inert gas settings. The alloy’s high electrical resistivity (1.35 μΩ·m) and low temperature coefficient of resistance (TCR) ensure stable energy output, offering a cost-effective alternative to traditional nickel-chromium alloys while maintaining longevity in extreme thermal conditions.

Technical Specifications (Table)

Applications

1. Industrial Heating: Elements for annealing, brazing, and sintering furnaces.

2. Consumer Appliances: Oven coils, electric stoves, and hair dryer heating wires.

3. Automotive: Glow plugs, EGR heaters, and diesel particulate filter systems.

4. Energy Sector: Electric boilers and heat recovery ventilation units.

5. Aerospace: High-temperature sensors and ignition components.

Q&A

Q1: What is the maximum continuous operating temperature for 0Cr21Al6 strips?
A: 1,250°C in continuous use and 1,350°C for intermittent operations, depending on environmental conditions.

Q2: Can this alloy withstand corrosive chlorine-rich atmospheres?
A: The alumina layer provides moderate resistance, but prolonged exposure to chlorine above 800°C may require protective coatings.

Q3: Is pre-oxidation necessary for new 0Cr21Al6 heating elements?
A: Yes. Heat-treating at 900–1,000°C for 1–2 hours enhances the protective oxide layer, extending service life.

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.