UNS N10675|2.4600|Hastelloy B3 Seamless Pipe
Our Hastelloy B3 seamless pipes feature superior thermal stability compared to its predecessor, Alloy B2, significantly reducing the risk of embrittlement during welding and heat treatment. These pipes offer outstanding protection against stress-corrosion cracking (SCC), pitting, and knife-line attack in chemical processing environments involving sulfuric, phosphoric, and acetic acids. Through advanced cold-drawing and vacuum annealing, XinZhe ensures every pipe maintains tight dimensional tolerances and a high-integrity surface finish for the most demanding corrosive applications.
"Why Upgrade to Hastelloy B3? Unlike B2, Alloy B3 maintains its ductility even after transient exposure to intermediate temperatures during fabrication."
What Is Seamless Hastelloy B3 Pipe?
Hastelloy B3 (UNS N10675) is a high-performance nickel-molybdenum superalloy specifically developed to provide exceptional resistance to hydrochloric acid (HCl) and other strongly reducing chemical environments.
A Seamless Hastelloy B3 Pipe is produced from a solid billet through hot extrusion and precision cold drawing, eliminating welded seams that may become weak points in corrosive or high-pressure environments. This seamless structure ensures uniform metallurgical properties, high mechanical integrity and long-term reliability.
Hastelloy B3 represents a significant improvement over earlier B-series alloys, offering enhanced thermal stability, improved fabricability and more reliable corrosion performance. Manufacturing is in compliance with ASTM B622.
Why Choose Hastelloy B3 Instead of Hastelloy B2
Enhanced Thermal Stability: earlier B-series alloys such as B2 could form brittle intermetallic phases during welding or heat treatment; B3 was specifically engineered to resist the formation of these phases, maintaining ductility during fabrication.
Reduced Embrittlement Risk: B3 significantly reduces grain boundary precipitation and embrittlement, allowing safer processing during welding, hot forming and thermal cycling.
Improved Fabrication Performance: easier to weld, form and machine compared with B2, reducing production complexity and manufacturing costs.
Key Features and Technical Advantages
Exceptional Resistance to Reducing Acids
outstanding corrosion resistance in hydrochloric acid at all concentrations and temperatures, plus excellent resistance to sulfuric, phosphoric and organic acids.
Superior Thermal Stability
optimized chemistry minimizes brittle phase formation, improving resistance to SCC, thermal embrittlement and microstructural degradation during welding.
Strong Resistance to Chloride Environments
high nickel and molybdenum content (~30% Mo) provides excellent protection against chloride-induced corrosion and stress corrosion cracking.
Uniform Structural Integrity
seamless manufacturing ensures consistent wall thickness, uniform grain structure and improved mechanical strength across the entire pipe length.
Product Specifications and Data
Chemical Composition
The high molybdenum content provides exceptional corrosion resistance in reducing environments.
| Grade | Ni | Cr | Mo | Fe | W | C | Si | Co | Mn | V | P | Ti | Cu | Al | Zr |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| N10675 | ≥ 65.00 | 1.00–3.00 | 27.00–32.00 | 1.00–3.00 | ≤ 3.00 | ≤ 0.01 | ≤ 0.10 | ≤ 3.00 | ≤ 3.00 | ≤ 0.20 | ≤ 0.03 | ≤ 0.20 | ≤ 0.20 | ≤ 0.50 | ≤ 0.10 |
Typical Mechanical Properties
Hastelloy B3 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 760 MPa | ≥ 350 MPa | ≥ 40% | ≤ 100 HRB |
Typical Physical Properties
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
|---|---|---|---|---|---|
| 9.22 g/cm³ | 1370–1418 ℃ | 10.6 µm/m·℃ | 8.1 W/m·K | 209 GPa | 1.37 µΩ·m |
Hastelloy B3 vs Hastelloy B2: Key Differences
| Feature | Hastelloy B2 | Hastelloy B3 |
|---|---|---|
| UNS Number | N10665 | N10675 |
| Main Advantage | High molybdenum corrosion resistance | Improved thermal stability |
| Embrittlement Risk | Higher during welding | Significantly reduced |
| Fabrication | Requires strict temperature control | Easier welding and forming |
| Standard Specification | ASTM B622 | ASTM B622 |
In most chemical processing applications, Hastelloy B3 is considered a superior replacement for Hastelloy B2 due to its improved thermal stability, while maintaining the same excellent corrosion resistance in reducing environments.
Industrial Applications of Seamless Hastelloy B3 Pipes
Chemical Processing Industry
- Herbicides and pesticides production
- Ethylene glycol manufacturing
- Organic acid processing
Hydrochloric Acid Systems
- Pickling tank piping systems
- Acid regeneration plants
- HCl transfer pipelines
Pharmaceutical Manufacturing
- Chemical reactors
- High-purity heat exchangers
- Acid handling systems
Petrochemical Industry
- Alkylation units
- Acid processing systems
- Corrosion-resistant heat exchangers
Manufacturing Process and Quality Assurance
Manufacturing
billet heating and hot piercing → precision cold drawing or pilger rolling → solution annealing → final dimensional finishing and inspection, per ASTM B622.
Quality Testing
PMI, non-destructive testing (UT and Eddy Current), hydrostatic pressure testing and mechanical testing according to ASTM standards.
Certification
EN 10204 3.1 / 3.2 Material Test Certificates, third-party inspection (SGS, BV, ABS, Lloyd’s) and corrosion testing including intergranular and pitting tests.
Frequently Asked Questions About Hastelloy B3 Pipe
Is Hastelloy B3 interchangeable with B2?
In most chemical processing applications, yes. B3 provides the same excellent reducing-acid resistance with improved thermal stability, making it a superior replacement for B2.
What standards apply to Hastelloy B3 seamless pipe?
Seamless pipe and tube are produced to ASTM B622, with general requirements per ASTM B829.
What makes B3 more stable than B2?
The optimized Ni-Mo chemistry resists the formation of brittle intermetallic phases in the 600–800°C range, reducing embrittlement risk during welding and heat treatment.
Where is Hastelloy B3 pipe commonly used?
Hydrochloric acid systems, herbicide and ethylene glycol production, pharmaceutical reactors and heat exchangers, and petrochemical alkylation units.
What inspection and certification are available?
PMI, UT and Eddy Current testing, hydrostatic testing, intergranular and pitting corrosion tests, EN 10204 3.1/3.2 certificates and third-party inspection.
Ready to Request a Quotation?
Send your Hastelloy B3 pipe enquiry with grade, ASTM B622 and edition, OD × wall thickness, length, quantity, end finish, delivery destination and inspection documents — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.
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