Hastelloy C-4 Pipe&Tube
Products Description
Hastelloy C-4 Pipe&Tube (UNS N06455) is a nickel-chromium-molybdenum alloy pipe and tube designed for demanding corrosion-resistant applications. Manufactured in accordance with ASTM B622, B619, and B626, it is available in seamless and welded forms. Hastelloy C-4 offers excellent resistance to oxidizing and reducing environments, stress corrosion cracking, and high-temperature degradation. It is widely used in chemical processing, petrochemical equipment, acid handling systems, and other industrial applications requiring reliable corrosion resistance.
Corresponding Standards
| Seamless Pipe/Tube | ASTM B622 | ASME SB622 |
| Welded Pipe | ASTM B619 | ASME SB619 |
| Welded Tube | ASTM B626 | ASME SB626 |
Other relevant standards:
UNS: N06455
DIN: 17744 / 17750 and other relevant material specifications
Werkstoff Nr.2.4610
EN Material name: NiMo16Cr16Ti
The product forms corresponding to the above standards are different, and B622, B619 and B626 cannot be simply used interchangeably.
Chemical Composition
| Nickel (Ni) | Balance |
| Chromium (Cr) | 14.00–18.00 |
| Molybdenum (Mo) | 14.00–17.00 |
| Iron (Fe) | ≤3.00 |
| Cobalt (Co) | ≤2.00 |
| Manganese (Mn) | ≤1.00 |
| Titanium (Ti) | ≤0.70 |
| Carbon (C) | ≤0.015 |
| Silicon (Si) | ≤0.08 |
Mechanical Properties
| Tensile Strength | ≥690 MPa |
| Yield Strength (0.2%) | ≥276 MPa |
| Elongation | ≥40% |
Physical Properties
| Density | 8.64 g/cm³ |
| Melting Range | 1335–1380°C |
| Thermal Conductivity | 10.1 W/(m·K) |
| Electrical Resistivity | 1.25 μΩ·m |
Manufacturing Process & Fabrication
Seamless Tube Manufacturing
The manufacturing process for Hastelloy C-4 seamless tubes includes billet heating, punching, hot rolling, and cold drawing to achieve the required diameter, wall thickness, and dimensional accuracy.
Welded Tube Manufacturing
The manufacturing process for welded tubes involves forming Hastelloy C-4 alloy strip into a tubular shape, followed by longitudinal welding, sizing, and finishing.
Cold Drawing and Heat Treatment
Cold drawing improves dimensional accuracy and surface quality. Solution annealing is performed as needed to restore material properties and maintain corrosion resistance.
Surface Treatment and Inspection
Finished tubes can be pickled, polished, or bright annealed. Dimensional inspection, mechanical property testing, and appropriate non-destructive testing help ensure product quality.
FAQ
Q: What is the difference between Hastelloy C-4 seamless and welded pipes?
A: Seamless pipes are manufactured through piercing, rolling, and drawing processes without a longitudinal weld seam. Welded pipes are produced by forming alloy strips and welding the longitudinal joint. The choice depends on pressure requirements, dimensions, and application conditions.
Q: Is Hastelloy C-4 suitable for hydrochloric acid applications?
A: Yes. Hastelloy C-4 offers good resistance to hydrochloric acid and other reducing environments. However, corrosion performance depends on acid concentration, temperature, and operating conditions.
Q: Can Hastelloy C-4 tubes be welded?
A: Yes. Hastelloy C-4 can be welded using suitable welding processes, such as TIG (GTAW). Appropriate filler metals and welding procedures should be selected to maintain corrosion resistance.
Q: Can Hastelloy C-4 tubes be customized?
A: Yes. Customized outside diameters, wall thicknesses, lengths, and surface finishes can be arranged according to project specifications and production capabilities.
Q: What is the difference between Hastelloy C-4 and Hastelloy C-276?
A: Both are nickel-chromium-molybdenum alloys with excellent corrosion resistance. C-4 is particularly recognized for its thermal stability, while C-276 offers broad resistance across various aggressive corrosive environments. Material selection should be based on the actual operating medium and temperature.
Lork Group
Marketing Operations Department
Email: layla@lorkgroup.com
WhatsApp: +86 199 3707 5488
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