Corrosion Resistant Hastelloy Alloy C-22 UNS N06022 W.Nr.2.4602 Welding Bolts For Chemical Processing And Marine Applications

Corrosion Resistant Hastelloy Alloy C-22 UNS N06022 W.Nr.2.4602 Welding Bolts for Chemical Processing and Marine Applications

Welding Hastelloy C-22 (UNS N06022, W.Nr. 2.4602) bolts requires expertise due to its high corrosion resistance and alloy composition. This nickel-based alloy, containing chromium, molybdenum, and tungsten, offers excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. For welding, GTAW (TIG) is preferred, using matching filler metals like ERNiCrMo-10. Cleanliness is crucial to prevent contamination, and low heat input minimizes distortion and carbide precipitation. Preheating is unnecessary, and post-weld heat treatment is typically not required. Shielding gas, such as argon or argon-helium mixtures, ensures a stable arc and prevents oxidation. Proper technique results in durable, corrosion-resistant welds suitable for harsh chemical environments, making Hastelloy C-22 bolts reliable in demanding applications.

Welding Hastelloy C-22 (UNS N06022, W.Nr. 2.4602) bolts requires careful consideration due to the material’s composition and properties. Here are the key features to keep in mind:

1. Corrosion Resistance

• Exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking.
• Withstands harsh environments, including oxidizing and reducing agents, making it ideal for chemical processing, marine, and aerospace applications.

2. Weldability

• Highly weldable using common techniques like GTAW (TIG), GMAW (MIG), and SMAW (stick welding).
• Low risk of carbide precipitation, reducing susceptibility to intergranular corrosion.
• Autogenous welding (fusion welding without filler) is possible but may not be ideal for thicker sections.

3. Recommended Filler Material

• Use ERNiCrMo-10 (AWS A5.14) filler wire for GTAW/MIG processes.
• For stick welding (SMAW), ENiCrMo-10 electrodes are recommended.

4. Preheat & Post-Weld Treatment

• No preheating required due to low carbon content.
• Post-weld heat treatment (PWHT) is typically not necessary, but stress-relief annealing at 1100–1150°C (2012–2102°F) may be performed for specific applications.

5. Welding Challenges & Precautions

• Maintain a low heat input to prevent grain growth and hot cracking.
• Use argon shielding gas (pure or Ar-He mix) to avoid oxidation.
• Avoid contamination from iron-based tools or grinding dust to prevent embrittlement.

Applications:

Welding Hastelloy C-22 (UNS N06022, W.Nr. 2.4602) bolts requires special attention due to its high nickel content and excellent corrosion resistance. Here’s what you need to know:

1. Material Characteristics

• Hastelloy C-22 is a nickel-chromium-molybdenum alloy with exceptional resistance to oxidizing and reducing environments.
• Used in harsh chemical processing, marine, and aerospace applications.
• Prone to hot cracking and segregation if not welded correctly.

2. Welding Process Selection

• GTAW (TIG) Welding – Preferred for precision and low heat input.
• GMAW (MIG) Welding – Used for larger weldments but requires pulsed spray transfer.
• SMAW (Stick) Welding – Possible but not commonly used for bolt applications.
• PAW (Plasma Arc Welding) – Effective for automated processes.

3. Filler Material Selection

• Use ERNiCrMo-10 (AWS A5.14) for the best compatibility.
• Alternative: ERNiCrMo-4, but it may have slightly different composition.

4. Pre-Weld Preparation

• Clean the surface thoroughly to remove oil, grease, or oxide layers.
• Use a carbide burr or mechanical cleaning (avoid iron-contaminated tools).
• Maintain sharp edge preparation to avoid porosity.

5. Welding Parameters

• Low heat input to prevent excessive grain growth.
• Interpass temperature: Maintain below 93°C (200°F).
• Use Argon or Argon-Helium shielding gas to prevent oxidation.
• Avoid weaving; use stringer beads instead.

6. Post-Weld Treatment

• Solution annealing at 2050°F (1121°C) and rapid quenching may be needed for optimal corrosion resistance.
• Pickling and passivation with nitric acid to restore corrosion resistance.

7. Application Considerations

• Used in chemical plants, desalination, and high-temperature oxidizing environments.
• Bolt welding should be done with minimal distortion to maintain mechanical properties.
• If possible, consider using mechanical fastening over welding for better reliability.

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.