Hastelloy B-2 Nickel Alloy Pipe Fittings UNS N10665 for Pipeline Petrochemical Engineering
Hastelloy B-2 Acid Alkali Resistance Pipe Fittings UNS N010665 Pipeline Petrochemical Engineering
Hastelloy B-2 is a nickel-molybdenum alloy with significant resistance to reducing environments, such as hydrogen chloride gas, sulfuric, acetic and phosphoric acids. This alloy provides excellent resistance to pure sulfuric acid and a number of non-oxidizing acids. The alloy's resistance to chloride-induced stress corrosion cracking is also noteworthy. Hastelloy B-2 is used extensively in the chemical, petrochemical, and oil and gas industries, particularly in aggressive environments.
Characteristics
- Excellent Corrosion Resistance: Particularly in reducing environments. It is not recommended for use in oxidizing media.
- High Temperature Performance: Maintains integrity in high-temperature applications up to around 537°C (1000°F).
- Resistance to Stress Corrosion Cracking: Especially in chloride environments, making it suitable for harsh chemical conditions.
Applications in Petrochemical Industry
- Acid Production: Resistance to sulfuric, hydrochloric, and phosphoric acid makes it ideal for fittings, valves, and pumps in acid production plants.
- Chemical Processing: Used in reactors, columns, and pipes where reducing chemical environments are present.
- Gas Processing: Suitable for heaters, boilers, and other components exposed to corrosive gases.
Common Product Forms
- Pipe Fittings: Elbows, tees, reducers, and caps that are essential for directing flow, changing pipe sizes, or connecting different components within the petrochemical processing plants.
- Valves: Used to control flow and pressure within the systems where corrosive materials are processed.
- Flanges: Providing a removable section of the pipe for maintenance.
Manufacturing and Specifications
- Welding: Hastelloy B-2 can be welded by all common welding techniques; however, it requires careful handling to avoid embrittlement in the heat-affected zone.
- Specifications: Products are manufactured in accordance to specific standards such as ASTM, ASME, and ANSI to ensure they meet industry requirements for safety and performance.
Maintenance and Durability
- Preventative Maintenance: Regular inspection and maintenance are crucial as even with high corrosion resistance, harsh environments can eventually lead to degradation.
- Longevity: When correctly used and maintained, Hastelloy B-2 fittings can provide long service life, reducing the need for frequent replacements and minimizing operational downtime.
Hastelloy B-2's robustness against corrosive environments makes it a preferred choice for petrochemical applications where the longevity and integrity of the piping system are critical. Choosing the appropriate alloy for specific environments, considering the chemical nature and operational conditions, is vital for the safety and efficiency of petrochemical processes.
| Grade | UNS | Density | Tensile Strength (MPa min) | Yield Strength (MPa min) | Reduction of Area min (%) | Elongation min (%) | Hardness (HRC) |
| HASTELLOY B-2 | N10665 | 9.22 | 760MPa | 350Pa min | / | 40%min | / |
Chemical Composition(%):Hastelloy B2:
| Ni | Mo | Fe | Cr | Co | C | Mn |
| Remainder | 26.0-30.0 | 2.0max | 0.4-1.0 | 1.0max | 0.02max | 1.0max |
| P |
S |
Si | ||||
| 0.04max | 0.03max | 0.1max |
The following table lists only some of the grades:
| Grade | UNS | DIN |
| Monel 400 | N04400 | W.Nr. 2.4360 |
| Monel K-500 | N05500 | W.Nr. 2.4375 |
| Inconel 625 | N06625 | W.Nr. 2.4856 |
| Inconel 718 | N07718 | W.Nr. 2.4668 |
| Inconel X-750 | N07750 | W. Nr. 2.4669 |
| Inconel 600 | N06600 | W.Nr. 2.4816 |
| Inconel 601 | N06601 | W.Nr. 2.4851 |
| Incoloy 825 | N08825 | W.Nr. 2.4858 |
| Incoloy 020 | N08020 | / |
| Incoloy 028 | N08028 | / |
| Incoloy 925 | N09925 | / |
| Incoloy A-286 | S66286 | W.Nr.1.4980 |
| Incoloy 800 | N08800 | / |
| Incoloy 800H | N08810 | W.Nr.1.4958 |
| Incoloy 800HT | N08811 | W.Nr.1.4959 |
| Hastelloy C-276 | N10276 | W.Nr.2.4819 |
| Hastelloy C-22 | N06022 | W.Nr.2.4602 |
| Hastelloy C-4 | N06455 | W.Nr.2.4610 |
| Hastelloy B-3 | N10675 | W.Nr.2.4600 |
| Hastelloy X | N06002 | W.Nr.2.4665 |
| Hastelloy B-2 | N10665 | W.Nr.2.4617 |
| F44 | S31254 | / |
| F51 | S31803 | / |
| F53 | S32750 | / |
| F55 | S32760 | / |
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