Welding Hastelloy Bar C-22 UNS N06022 W.Nr.2.4602 Suitable For Environments With Alternating Oxidizing And Reducing Conditions

Welding Hastelloy Bar C-22 UNS N06022 W.Nr.2.4602 Suitable For Environments With Alternating Oxidizing And Reducing Conditions

Hastelloy C-22 is a highly versatile nickel-chromium-molybdenum-tungsten alloy known for its outstanding resistance to a wide range of corrosive environments. This alloy is particularly valued for its ability to withstand both oxidizing and reducing conditions, making it ideal for use in various demanding industries.

Hastelloy C-22 exhibits excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. It is highly resistant to both oxidizing and reducing media, which makes it suitable for environments where such conditions may alternate. The alloy performs exceptionally well in a variety of aggressive chemical environments, including chlorides, wet chlorine, hypochlorite, and chlorine dioxide solutions. It also resists the corrosive effects of sulfuric, acetic, formic, and phosphoric acids. Hastelloy C-22 maintains its mechanical properties and corrosion resistance at elevated temperatures, making it suitable for high-temperature applications. The alloy can be readily fabricated using conventional methods, including welding, which does not significantly degrade its corrosion resistance.

Welding Hastelloy C-22 (UNS N06022, W.Nr. 2.4602) requires special considerations due to its unique properties. Here are the key features and guidelines:

Key Features of Hastelloy C-22 Welding

• Excellent Corrosion Resistance

Superior resistance to oxidizing and reducing environments, including chlorides, sulfuric acid, nitric acid, and seawater.

Resists pitting, crevice corrosion, and stress corrosion cracking.

• High-Temperature Performance

Retains mechanical strength and corrosion resistance at high temperatures.

Suitable for applications in extreme chemical processing environments.

• Weldability

Good weldability using common welding methods (GTAW/TIG, GMAW/MIG, SMAW, and PAW).

Avoids carbide precipitation and intermetallic phases that could degrade corrosion resistance.

• Low Thermal Conductivity

Requires controlled heat input to prevent excessive distortion and cracking.

• Matching Filler Materials

ERNiCrMo-10 (AWS A5.14) or ENiCrMo-10 (AWS A5.11) recommended for best corrosion resistance.

• Preheating and Post-Weld Treatment

No preheating required.

Post-weld heat treatment (PWHT) is usually not necessary, but solution annealing (2050°F/1120°C) may be used for stress relief.

• Precautions During Welding

Keep interpass temperature below 200°F (93°C).

Avoid contamination from iron, carbon steel, or other reactive materials.

Use clean, non-contaminated shielding gas (argon or argon-helium mix).

These characteristics make Hastelloy C-22 ideal for harsh chemical processing, marine, aerospace, and power plant applications.

Applications:

Hastelloy C-22 is used across a wide range of industries due to its exceptional resistance to corrosion and versatility:

• Chemical Processing:

Reactors, heat exchangers, and other equipment exposed to aggressive chemicals.

Components handling acidic solutions and mixed acid environments.

• Pollution Control:

Flue gas desulfurization systems, scrubbers, and ducting.

Equipment for controlling emissions in waste processing.

• Oil and Gas:

Downhole tubing and components exposed to sour gas environments.

Offshore platforms and subsea equipment.

• Pharmaceutical and Food Processing:

Vessels, piping, and equipment requiring high purity and resistance to contamination.

Systems handling bioactive and corrosive media.

• Aerospace and Marine:

Components exposed to harsh marine environments.

High-strength fasteners and fittings in aerospace applications.

Hastelloy C-22 is a highly reliable and robust alloy designed to withstand the most challenging corrosive environments. Its excellent resistance to both oxidizing and reducing conditions, coupled with its thermal stability and ease of fabrication, make it a preferred material for critical applications in chemical processing, pollution control, oil and gas, and other demanding sectors.

Company Overview:

Jiangyin Chengxin Alloy Material Co., Ltd has more than 20 years of experience as the lead.ing alloy wire manufacturer in China. We offer a wide range of services from fine wire drawing toresistance wire manufacturing. Since the beginning, our specialty has been the quality and preci.sion of our products. We have the tightest tolerances and deliver within a few days to a fewweeks. As a result, we have become the leading alloy wire supplier in the industry.

Senphus Subsidiaries:

• Jiangyin Chengxin Alloy Material Co., Ltd.
• Jiangyin Senphus Electrical Materials Co., Ltd.
• Jiangsu Xiangcheng Supply Chain Management Co., Ltd.

Jiangyin Chengxin Alloy Material Co., Ltd.: With nearly 20 years of experience, Jiangyin Chengxin is a leading alloy wire manufacturer in China. We offer a wide range of services, from fine wire drawing to resistance wire manufacturing. Our specialty lies in the quality and precision of our products, achieving the tightest tolerances and delivering orders within days to weeks. As a result, we have established ourselves as the premier supplier of alloy wire in the industry.

Our product range includes:

• Copper-nickel alloys (CuNi1-CuNi44)
• Karma (Nikrothal L/Evanohm/Alloy 800)
• Manganin and Constantan
• Nickel-chromium alloys
• Thermocouple alloys (Type K, N, E, T, J)
• Thermocouple extension wire
• PTC thermistor resistance alloy
• Pure nickel wire and Monel alloy

These alloys are available in various forms, including wire, ribbon, stranded, and enamelled. Major applications include seat heating, underfloor heating, military projects, aerospace, household appliances, heating wire, mechanical and electrical plants, and temperature instruments. Our manufacturing processes are ISO 9001:2015 certified, and we specialize in fine and ultra-fine wire drawing, offering wire diameters from 0.025 mm (0.001") to 13 mm (0.51") in small batches, medium volumes, and mass production. We maintain a comprehensive quality inspection system, including in-house chemical analysis, chromatographic analysis, metallurgical analysis, pinhole tests, wire construction tests, and tension tests to ensure the highest quality standards.

Senphus Electrical Material Co., Ltd.: Founded in 2003, Senphus Electrical Material Co., Ltd. integrates research, manufacturing, and sales of electric heating alloys, heating cables, heating wires, and heating products. Leveraging over a decade of technical expertise in heating alloy wire, we have adopted advanced heating cable technology and machinery, successfully developing heating cables, temperature controllers, and temperature control systems suitable for building heating, pipe insulation, outdoor snow melting, wind power blade production, car seat heating, and healthcare applications.

The company is recognized as a high-tech enterprise in Jiangsu Province and a small giant enterprise in Jiangyin City, specializing in innovative technologies. We operate the "Wuxi Heating Cable Engineering Technology Research Center" and collaborate with experts from renowned domestic universities. Our portfolio includes 5 invention patents and over 30 utility model patents, showcasing our strong research and development capabilities.

With an annual output exceeding 1,000 tons of thermal alloy wire and an output value of approximately 105 million yuan, our products are well-received in markets such as the UK, Italy, Canada, Peru, and Spain. Our heating cables generate an annual output value of over 80 million yuan, with exports to Germany, Japan, the United States, Malaysia, Denmark, Brazil, and other countries.

The company has successfully passed multiple quality management system certifications, including IATF 16949, ISO 9001, ISO 14001 (Environmental Management System), and ISO 45001 (Occupational Health and Safety Management System). Our heating cables and related products have also obtained test reports from the Shanghai Cable Research Institute Test Center and received certifications such as UL (United States), VDE (Germany), CE (European Union), and RoHS.

Commitment to Quality: We adhere to the business commitment of "Reputation First, Quality First, Customer First" and uphold the quality policy of "Integrity-Based, Quality-Oriented, Excellent Service." We are dedicated to providing accurate products and professional services, and we look forward to collaborating sincerely with you to achieve mutual success.