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ASTM B622 UNS N10665 refers to a nickel-molybdenum-chromium alloy, which is also known by its trade name "Hastelloy B-2."
Hastelloy alloy B-2 seamless pipe is a corrosion-resistant alloy that is primarily composed of nickel (Ni) with significant amounts of molybdenum (Mo) and chromium (Cr). It is known for its excellent resistance to a wide range of corrosive environments, including strong acids and reducing conditions.
| Element | Content Range (%) | Primary Metallurgical Function |
| Nickel (Ni) | Balance (65% – 70%) | Provides base matrix stability and high-temperature strength. |
| Molybdenum (Mo) | 26.0% – 30.0% | Delivers superior resistance to reducing acids (e.g., hydrochloric, sulfuric). |
| Iron (Fe) | 2.0% max | Minimized to maintain resistance to localized attack. |
| Chromium (Cr) | 1.0% max | Offers auxiliary oxidation resistance. |
| Cobalt (Co) | 1.0% max | Controls high-temperature phase stability. |
| Carbon (C) | 0.02% max | Low carbon content prevents carbide precipitation during welding. |
Mechanical Properties of UNS N10665 Seamless Pipes
When evaluating Hastelloy B-2 seamless tubes for pressure vessels or piping systems, engineers look to the mechanical properties required under ASTM B622:
| Mechanical Property | Metric (Typical Minimum) | Imperial / US Standard |
| Tensile Strength (Min) | ≥ 790 MPa | 115 ksi |
| Yield Strength (0.2% Offset, Min) | ≥ 350 MPa | 50 ksi |
| Elongation in 2 in. (50mm), Min | ≥ 40% | 40% |
| Brinell Hardness (Max) | ≤ 230 HBW | ≤ 230 HBW |
Key Characteristics & Advantages
Outstanding Resistance to Hydrochloric Acid: UNS N10665 is uniquely suited for handling hydrochloric acid at all concentrations and boiling points.
Resistance to Reducing Media: Provides exceptional performance in reducing environments containing sulfuric, phosphoric, and acetic acids.
Low Carbon Weldability: The extremely low carbon content (max 0.02%) minimizes carbide precipitation in the heat-affected zone (HAZ) during welding, allowing the pipe to be used in the as-welded condition for most chemical processes.
Stress Corrosion Cracking Resistance: Highly immune to chloride-induced stress corrosion cracking (SCC).
Typical Industrial Applications
Chemical Processing: Equipment, piping, and reactors involved in the production of acetic acid, hydrochloric acid, and chlorinated catalysts.
Pharmaceutical Industry: Handling corrosive reaction media requiring contamination-free containment.
Petrochemical Refineries: Waste acid recovery systems and alkylation units.
Source Certified ASTM B622 UNS N10665 Pipes from HT PIPE
Zhengzhou Huitong Pipeline Equipment Co., Ltd. (HT PIPE) supplies certified nickel alloy seamless pipes and tubes accompanied by full material test reports (MTC EN 10204 3.1).
Available Forms: Seamless pipes, capillary tubes, heat exchanger tubes, and custom cut lengths.
Quality Assurance: Strict dimensional inspection, PMI testing, and hydro-testing per ASTM standards.
