1.Introduce
– Ni alloy with large amounts of Mo added
– Minimized Fe and Cr content to reduce machining brittleness
– Alloy with excellent resistance to hydrogen chloride gas and sulfuric, acetic, and phosphoric acid environments
– UNS N10665
* UNS
- Abbreviation of Unified Numbering Systems for Metals and Alloys
- Unified numbering system for metals and alloys
- A representative number that is compatible with metals and alloys defined in many material – related codes such as ASTM, AISI, ASME, AWS, etc.
* N : Nickel and nickel alloys
* UNS N10665 : 10XXX : Molybdenum (Hastelloy)
* Hastelloy
– Corrosion – resistant alloy with Ni as the main component
– Good machinability, weldability
* Hastelloy B
(1) Main composition
– Ni – Mo
(2) Characteristics
– Hydrochloric acid resistant alloy : Excellent hydrochloric acid resistance due to the addition of a large amount of Mo
– Good corrosion resistance, resistance to hydrogen chloride gas and reducing solutions
2. Property
– Excellent resistance to reducing environments (hydrogen chloride, sulfuric acid, acetic acid, phosphoric acid), stress corrosion cracking, high temperature resistance, corrosion resistance
– Poor corrosion resistance in oxidizing environments → Not suitable for use in environments with oxidizing, iron or copper salts
– Not suitable for use at secondary phase formation temperature (approx. 578 ~ 871℃) → Reduced ductility when forming secondary phase (Ni₃Mo, Ni₄Mo)
| Element | Impact |
|---|---|
| Ni | Provide corrosion resistance |
| Mo | Provides sulfuric acid and hydrochloric acid corrosion resistance |
| Co | Provides strength, corrosion resistance, and high temperature performance |
[Hastelloy B2 Chemical Composition (%)]
| Ni | Cr | Fe | C | Si |
|---|---|---|---|---|
| 64.81 ~ 74.00 | Max. 1.00 | Max. 2.00 | Max. 0.02 | Max. 0.10 |
| Mn | Mo | S | Co | P |
|---|---|---|---|---|
| Max. 1.00 | 26.00 ~ 30.00 | Max. 0.03 | Max. 1.00 | Max. 0.04 |
[Hastelloy B2 Mechanical Properties]
| Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|
| Min. 760 | Min. 350 | Min. 40.00 |
[Hastelloy B2 Physical Properties]
| Density (g/cm³) | Melting Range (℃) | Specific Heat (0~100℃) / J/kg*℃ |
|---|---|---|
| 9.20 | 1330 ~ 1380 | 377 |
3. Standard & Specification
– Specification : UNS N10665
| Product Form | ASTM | AWS |
|---|---|---|
| Plate, Sheet, Strip | B333, D333 | – |
| Bar | B335 | – |
| Pipe, Tube | B622, D622, B619, B626 | – |
| Forgings | D564 | – |
| Filler Metal | – | A5.14ERNiMo-7 |
| Welding electrodes | – | A5.11ENiMo-7 |
4. Available Form
– Bar
– Plate & Sheet & Strip
– Pipe & Tube
– Forgings
– Filler Metal
– Welding electrodes
– Coil & Wire
5. Application & Product
– Oil & Gas, Marine
| Application | Product |
|---|---|
| Oil & Gas | Chemical reactors, Degassing equipment, Fasteners, Flange shafts, High pressure valves, Piping |
| Marine | Freshwater tanks, Marine fasteners, Pump shafts |
(1) Chemical reactors / (2) Piping / (3) Degassing equipment / (4) Freshwater tanks / (5) Marine fasteners
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