YUHONG HOLDING GROUP CO., LTD
YUHONG HOLDING GROUP CO., LTD
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ASTM B622 C22 Heat Exchanger Tube Chemical Composition
| UNS Designation | Ni | Cr | Mo | Fe | W | C | Si | Co | Mn | V | P | S |
| N06022 | 50.0min | 20.0-22.5 | 12.5-14.5 | 2.0-6.0 | 2.5-3.5 | 0.15max | 0.08 | 2.5max | 0.50max | 0.35max | 0.02 | 0.02 |
ASTM B622 C22 Heat Exchanger Tube Corrosion Resistance & Performance
Key Strengths:
Resists pitting, crevice corrosion, and stress corrosion cracking.
Superior to C276/C4 alloys in mixed-acid environments (e.g., HCl + HNO₃)
Critical Environments:
Wet chlorine, nitric acid, seawater, chlorides (FeCl₃, CuCl₂).
Reducing media (e.g., sulfuric/acetic acid) and oxidizing agents
Welding Performance:
Resists intergranular precipitation in heat-affected zones.
No post-weld heat treatment needed for most applications
ASTM B622 C22 Heat Exchanger Tube Applications
Chemical Processing: Reactors, heat exchangers handling chlorides/acetic acid
Oil & Gas: Downhole components in sour gas (H₂S) environments
Pollution Control: Flue gas desulfurization (FGD) systems, scrubbers
Pharmaceuticals: High-purity equipment requiring sterile corrosion resistance
Specialized Uses: Geothermal wells, nuclear fuel reprocessing, pesticide production
ASTM B622 C22 Heat Exchanger Tube Certifications & Equivalents
International Standards:
DIN 2.4602, EN NiCr21Mo14W, JIS NW6022.
Related Product Forms:
Welded Pipes: ASTM B619.
Fittings: ASTM B366 (ASME B16.9).
ASTM B622 C22 Heat Exchanger Tube Limitations & Fabrication Notes
Cost: High due to nickel/molybdenum content (3–5× stainless steel).
Fabrication Challenges:
Requires controlled welding (TIG/laser) to avoid carbide precipitation.
Machining necessitates low speeds and high coolant flow.
Thermal Sensitivity: Prolonged exposure above 650°C may cause embrittlement.
ASTM B622 C22 Heat Exchanger Tube Conclusion
ASTM B622 C22 SMLS tubes offer unmatched corrosion resistance in extreme industrial environments, validated by global standards and versatile performance across chemical, energy, and pharmaceutical sectors. Their balanced Ni-Cr-Mo-W composition ensures longevity in aggressive media, though cost and fabrication complexity require careful project planning. For dimensional tables or project-specific specs, manufacturers like SteelJRV or Epower Metals provide detailed datasheets.
