Seamless Hastelloy B3 Tube
Our Hastelloy B3 seamless tubes feature significantly improved thermal stability compared to Alloy B2, minimizing the risk of embrittlement during welding and fabrication. These tubes 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, GZH ensures every tube maintains uniform wall thickness and a high-integrity surface finish for the most demanding pharmaceutical and petrochemical applications.
"Why choose B3 over B2? Alloy B3 maintains its excellent ductility even after exposure to intermediate temperatures during fabrication."
What Is a Seamless Hastelloy B3 Tube?
Seamless B3 tube is a high-performance, corrosion-resistant tube crafted from a single, solid billet of a nickel-molybdenum superalloy. Unlike welded tubes, it's manufactured without any weld joint, ensuring superior structural integrity and reliability, especially under high-stress, high-temperature, and extremely corrosive conditions. The"Hastelloy B3"designation refers to a specific grade that is an improvement over its predecessor, Hastelloy B2. This alloy is particularly noted for its outstanding resistance to hydrochloric, sulfuric, and phosphoric acids, as well as its enhanced thermal stability. This improved stability prevents embrittlement during welding and fabrication, making it a top choice for applications in highly aggressive chemical processing and manufacturing environments.
Key Features and Advantages
Seamless Hastelloy tubes offer a unique combination of benefits that make them invaluable in the most demanding industries:
Superior Resistance to Reducing Environments: Provides outstanding resistance to hydrochloric, sulfuric, and phosphoric acids, even at high temperatures and concentrations.
Enhanced Thermal Stability: The alloy's composition and heat treatment prevent embrittlement from exposure to intermediate temperatures, which is a key advantage over older B-series alloys.
Exceptional Weldability: The alloy can be welded using a wide range of standard methods without the risk of post-weld corrosion, thanks to its improved thermal stability.
High Resistance to Stress-Corrosion Cracking: The high nickel and molybdenum content makes the alloy highly resistant to chloride-ion stress-corrosion cracking.
High Pressure and Temperature Tolerance: The seamless construction and robust material allow the tube to safely handle high internal pressures and extreme temperatures.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Hastelloy B3.
Table 1: Chemical Composition of Hastelloy B3
The composition of Hastelloy B3 is carefully balanced to achieve its superior corrosion resistance and high thermal stability.
| 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 |
Table 2: Typical Mechanical Properties of Hastelloy B3
Hastelloy B3 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Property | Value (Annealed) |
| Tensile Strength | ≥ 758 MPa |
| Yield Strength | ≥ 345 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 110 HRB |
Table 3: Typical Physical Properties of Hastelloy B3
These physical properties highlight the material's ability to perform reliably under a wide range of conditions.
| Property | Value |
| Density | 9.24 g/cm³ |
| Melting Point | 1350 - 1390 °C approx. |
| Thermal Expansion | 10.1 µm/m·°C (20-100°C) |
| Thermal Conductivity | 11.1 W/m·K (20°C) |
| Modulus of Elasticity | 210 GPa |
| Electrical Resistivity | 1.35 x 10⁻⁶ Ω·m (20°C) |
Common Applications
The combination of high corrosion resistance and high thermal stability of seamless Hastelloy B3 tubes makes them a preferred choice for:
Chemical Processing: Used in reactors, heat exchangers, and piping for handling hydrochloric, sulfuric, and other highly aggressive acids.
Pharmaceuticals: In the production of pharmaceutical goods where highly aggressive reducing agents are used and thermal stability during fabrication is a concern.
Waste Treatment: In equipment for processing hazardous and corrosive waste streams.
Vinegar Production: In equipment used for the production of acetic acid.
Manufacturing Process
The manufacturing of a Hastelloy Seamless Tubes is a precise, multi-step process:
- Heating: A solid billet of Hastelloy B3 is heated to a high temperature.
- Hot extrusion: Hot extrusion is a metal forming process that shapes a metal billet by forcing it through a die at a temperature above its recrystallization temperature. This process softens the material, allowing for the creation of complex cross-sectional profiles with reduced force compared to cold extrusion, and it is commonly used to manufacture products like bars, tubes, and other special shapes from metals like aluminum, copper, and steel.
- Drawing and Sizing: The hollow shell is then rolled and drawn to reduce its diameter and wall thickness to the desired dimensions.
- Heat Treatment: The tube is solution annealed to achieve its specified metallurgical properties and to ensure optimal performance and corrosion resistance.
- Finishing: The tube is cut to length, straightened, and subjected to rigorous non-destructive testing to verify its integrity before final inspection and packaging. This meticulous process ensures that every seamless Hastelloy B3 tube is built to withstand the most demanding applications
