Hastelloy B-2 Precision Tubes for Nuclear Reactor Coolant Systems
When it comes to high-performance tubing for demanding energy systems, DLX Alloy’s Hastelloy B-2 precision tubes set the standard for corrosion resistance, mechanical strength, and long-term reliability. Designed for nuclear reactor coolant systems, heat exchangers, and high-pressure pipelines, Hastelloy B-2 is a nickel-molybdenum alloy with superior resistance to hydrochloric acid and other strong reducing agents, making it a trusted material in the most extreme environments.
Hastelloy B-2 (UNS N10665 / W.Nr. 2.4617) is a nickel-molybdenum alloy known for its exceptional resistance to hydrogen chloride, sulfuric acid, acetic acid, and phosphoric acid. Its controlled carbon, silicon, and iron content prevent carbide precipitation during welding, maintaining consistent corrosion resistance even in welded joints—a critical factor in nuclear and chemical system integrity.
At DLX Alloy, our Hastelloy B-2 precision tubes are manufactured through precision cold-drawing, annealing, and surface polishing, achieving tight dimensional tolerances and smooth internal finishes ideal for coolant circulation and controlled chemical flow. Each tube undergoes non-destructive testing and microstructural inspection to ensure compliance with ASTM B622 and ASME SB622 standards.
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Nuclear reactor coolant and feedwater systems
Chemical and hydroprocessing equipment
High-pressure acid and reducing media pipelines
Heat exchangers and condensers
Pharmaceutical and semiconductor acid handling systems
Pulp and paper digesters and bleaching plants
In nuclear power generation, Hastelloy B-2 tubing plays a vital role in maintaining system purity and corrosion control under high pressure and temperature, especially in cooling circuits that handle aggressive chemicals or demineralized water.
item | HC-276 | C-22 | C-4 | B2 | B3 | N |
C | ≤0.01 | ≤0.015 | ≤0.015 | ≤0.02 | ≤0.01 | 0.04-0.08 |
Mn | ≤1 | ≤0.5 | ≤1 | ≤1 | ≤3 | ≤1 |
Fe | 4-7 | 2-6 | ≤3 | ≤2 | ≤1.5 | ≤5 |
P | ≤0.04 | ≤0.02 | ≤0.04 | ≤0.04 | -- | ≤0.015 |
S | ≤0.03 | ≤0.02 | ≤0.03 | ≤0.03 | -- | ≤0.02 |
Si | ≤0.08 | ≤0.08 | ≤0.08 | ≤0.1 | ≤0.1 | ≤1 |
Ni | rest | rest | rest | rest | ≤65 | rest |
Co | ≤2.5 | ≤2.5 | ≤2 | ≤1 | ≤3 | ≤0.2 |
Ti+Cu | -- | -- | ≤0.7 | -- | ≤0.4 | ≤0.35 |
Al+Ti | -- | -- | -- | -- | ≤0.5 | ≤0.5 |
Cr | 14.5-16.5 | 20-22.5 | 14-18 | ≤1 | ≤1.5 | 6-8 |
Mo | 15-17 | 12.5-14.5 | 14-17 | 26-30 | ≤28.5 | 15-18 |
B | -- | -- | -- | -- | -- | ≤0.01 |
W | 3-4.5 | 2.5-3.5 | -- | -- | ≤3 | ≤0.5 |
V | ≤0.35 | ≤0.35 | -- | 0.2-0.4 | -- | ≤0.5 |
Shape | Size (mm) |
Wire | 0.5-7.5 |
Rod/Bar | 8.0-200 |
Strip | (0.5-2.5)*(5-180) |
Tube/Pipe | Custom made |
Sheet/Plate | Custom made |
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The nuclear energy sector is experiencing renewed growth, driven by the global transition toward low-carbon energy. With new generation-IV nuclear reactors, material stability and corrosion resistance are critical to ensure safe and efficient operation. Traditional stainless steels can suffer from localized corrosion in acidic or chloride-rich environments, which poses serious risks for nuclear coolant systems.
This has accelerated the adoption of nickel-molybdenum alloys like Hastelloy B-2, which maintain structural integrity in both oxidizing and reducing conditions. Moreover, as hydrogen embrittlement prevention and thermal fatigue resistance become increasingly important, the demand for precision-engineered tubing with uniform grain structure and low impurity levels continues to rise.
DLX Alloy has responded to this trend by upgrading its melting and extrusion facilities to ensure purity and microstructural uniformity. We utilize advanced vacuum induction melting (VIM) and argon re-melting (VAR) processes to deliver tubing suitable for both nuclear and aerospace applications.
Our experience in nickel-based alloy processing allows us to produce tubes that withstand high pressures, thermal stress, and long-term exposure to aggressive coolants—qualities essential for safe and efficient nuclear system operation.
DLX Company Advantages
Full In-House Production Line – From alloy melting to cold drawing and precision finishing, ensuring total material traceability.
Strict Quality Control – Every batch tested for corrosion rate, grain structure, and microhardness uniformity.
Vacuum Melting and Argon Refining – Reduces inclusion and segregation for nuclear-grade purity.
High Dimensional Accuracy – OD tolerance up to ±0.05mm, ideal for automated reactor assembly.
Surface Finishing Excellence – Polished Ra ≤ 0.4μm for smooth coolant flow and reduced fouling.
Custom Lengths and Shapes – Available in straight, coiled, or bent configurations for reactor systems.
Global Compliance – Meets ASTM, ASME, ISO, and nuclear material standards.
Technical Partnership – DLX engineers provide corrosion modeling and custom alloy design assistance.
These advantages make DLX Alloy not only a reliable supplier but also a strategic partner for high-end industries requiring performance-critical tubing.
Technical Comparison Table
| Property / Alloy | Hastelloy B-2 (UNS N10665) | Hastelloy C-22 (UNS N06022) | Inconel 625 (UNS N06625) | 316L Stainless Steel |
|---|---|---|---|---|
| Nickel Content (%) | ~70 | 56 | 58 | 10–12 |
| Molybdenum (%) | 28 | 13 | 9 | 2–3 |
| Chromium (%) | <1 | 21 | 21 | 17–18 |
| Corrosion Resistance (HCl) | Excellent | Moderate | Moderate | Poor |
| Maximum Operating Temp (°C) | 1100 | 1250 | 980 | 900 |
| Weldability | Excellent (low carbide) | Excellent | Good | Excellent |
| Pitting Resistance | High | Very High | High | Low |
| Typical Applications | Nuclear, Chemical, Acid Lines | Pharma, Chemical, Heat Exchangers | Aerospace, Marine | Food, General Piping |
About Us:
Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications.
For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.
Client Visits
Building Stronger Partnerships
We support all kinds of testing:
1. What makes Hastelloy B-2 ideal for nuclear reactor coolant systems?
Its resistance to hydrogen chloride and strong reducing environments prevents corrosion in critical coolant circuits.
2. How does DLX Alloy ensure nuclear-grade purity?
We use vacuum melting (VIM/VAR) and chemical analysis to control impurities and maintain consistent composition.
3. Can Hastelloy B-2 be welded without loss of corrosion resistance?
Yes, its low carbon and silicon levels prevent carbide precipitation during welding.
4. What testing standards does DLX follow?
All tubes meet ASTM B622 and ASME SB622, with optional NDT, hydrostatic, and ultrasonic inspection.
5. What surface finishes are available?
We offer bright annealed, polished (Ra ≤ 0.4 μm), or passivated finishes for coolant applications.
6. Can DLX provide custom tube sizes?
Yes, we can produce OD from 6mm to 60mm and wall thickness from 0.5mm to 6mm.
7. How does Hastelloy B-2 compare with stainless steel in acid service?
It provides 10–20 times higher corrosion resistance, particularly in HCl and H₂SO₄ environments.
8. Which industries benefit most from B-2 precision tubing?
Nuclear energy, chemical processing, and high-purity acid transport systems.
In a world where performance, reliability, and safety define engineering success, DLX Alloy’s Hastelloy B-2 precision tubes are a proven solution for the next generation of nuclear and chemical systems. Engineered for durability and consistency, they deliver long-term resistance against corrosion, acid attack, and mechanical fatigue, even under extreme conditions.
By maintaining full control from alloy melting to final inspection, DLX ensures every tube meets nuclear-grade standards and customer expectations. Whether used in reactor coolant loops, chemical condensers, or high-pressure feed lines, DLX’s Hastelloy B-2 precision tubes guarantee performance you can rely on.
With years of experience in advanced alloy manufacturing, DLX continues to strengthen its position as a trusted partner for global energy and chemical industries, combining technical expertise, flexible customization, and uncompromising quality control.
