B2 Hastelloy is a nickel-molybdenum alloy with high levels of chromium and molybdenum. It has excellent corrosion resistance in a wide range of organic and inorganic acids. It also demonstrates good resistance to stress corrosion cracking and oxidation at high temperatures. Let’s look at this useful alloy’s composition, properties, and uses.
What Forms is Hastelloy B2 Available at Piping Mart?
- Hastelloy B2 Pipes
- Hastelloy B2 Tubing
- Hastelloy B2 Pipe Fittings
- Hastelloy B2 Forged Fittings
- Hastelloy B2 Bolts
Hastelloy B2 Chemical Composition
Hastelloy B2 is composed of iron (Fe), chromium (Cr), cobalt (Co), manganese (Mn), molybdenum (Mo), nickel (Ni), nitrogen (N) and silicon (Si). The iron content ranges from 29% to 33%, the chromium content ranges from 19% to 23%, the cobalt content ranges from 0% to 1%, the manganese content ranges from 1% to 3%, the molybdenum content ranges from 2% to 4%, the nickel content ranges from 57% to 61%, the nitrogen content ranges from 0.24% to 0.35%, and the silicon content ranges from 0.08% to 0.20%. The composition provides this alloy with its superior strength, toughness, and corrosion resistance properties.
| Ni | Mo | Fe | C | Co | Cr | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|
|
Balance
|
26.0-30.0
|
2.0 max
|
.02 max
|
1.0 max
|
1.0 max
|
1.0 max
|
.10 max
|
.040 max
|
.030 max
|
Hastelloy B2 Properties
Hastelloy B2 has excellent mechanical properties including superior tensile strength, yield strength, elongation, hardness, creep resistance, fatigue strength, impact strength, wear resistance, abrasion resistance and corrosion resistance in a wide range of organic acids as well as sulfuric acid solutions. It also exhibits good oxidation resistance up to 1800°F as well as good formability up to temperatures between 1400°F – 1900°F. Its low carbon content makes it easier for welding than other alloys with similar compositions while its high nickel content enhances weldability even further by improving weld penetration and providing uniformity in heat treatment across multiple production runs.
Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Density | 9.22 g/cm³ | 0.333 lb/in³ |
| Melting point | 1427°C | 2600°F |
Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 914 MPa | 133000 psi |
| Yield strength (@strain 0.200%) | 396 MPa | 57400 psi |
| Elastic modulus | 217 GPa | 31500 ksi |
| Elongation at break (in 50.8 mm) | 55% | 55% |
| Hardness, Brinell (converted from Rockwell B hardness) | 168 | 168 |
| Hardness, Knoop (converted from Rockwell B hardness) | 186 | 186 |
| Hardness, Rockwell B | 98 | 98 |
| Hardness, Vickers (converted from Rockwell B hardness) | 241 | 241 |
Hastelloy B2 Equivalents
- ASTM B333
- ASTM B335
- ASTM B366
- ASTM B564
- ASTM B619
- ASTM B622
- ASTM B626
- DIN 2.4615
- DIN 2.4617
- GE B50T38
Hastelloy B2 Specifications
| UNS | UNS N10665 |
| Hastelloy B2 Bar | ASTM B335 ASME SB335 |
| Hastelloy B2 Sheet | ASTM B333 |
| Hastelloy B2 Plate | ASTM B333 ASME SB333 |
| Hastelloy B2 Fitting | ASTM B366 ASME SB366 |
| Hastelloy B2 Forging | ASTM B564 |
| Hastelloy B2 Weld Wire | A5.14 ERNiMo-7 |
| Hastelloy B2 Weld Electrodes | ASME SFA 5.11(ENiMo-7) AWS A5.11 (ENiMo-7)
|
| Hastelloy B2 Seamless Pipe/Tube | ASTM B622 ASME SB622 |
| Hastelloy B2 Welded Pipe | ASTM B619 ASME SB619 |
| Hastelloy B2 Welded Tube | ASTM B626 ASME SB626 |
| Hastelloy B2 Bare Weld Rods | ASME SFA 5.14(ENiMo-7) |
| Din | 2.4617 |
Uses of Hastelloy B2
UNS N10665 is widely used in chemical processing applications such as pumps, valves, heat exchangers or tanks due to its superior corrosion-resistant properties against many organic acids as well as sulfuric acid solutions. It is also used for producing fasteners like bolts or screws due to its superior mechanical properties such as excellent tensile strength or creep resistance which helps ensure safety during operation or transportation under extreme conditions such as high temperature or pressure. Additionally, it can be used for manufacturing parts for aircraft engines due to its superior formability at elevated temperatures ranging between 1400°F – 1900°F which allows for easier shaping without compromising on quality or performance during operation under extreme conditions such as high altitude flight operations where air pressure is relatively low compared to ground level air pressure.
Conclusion
In conclusion, Hastelloy B2 is an ideal choice for many chemical processing applications due to its superior corrosion-resistant properties against many organic acids combined with its excellent formability at elevated temperatures allowing it to be easily shaped into components without sacrificing quality or performance under extreme conditions like high temperature or pressure operations which make it an ideal choice for producing parts like pumps valves, heat exchangers, tanks, or fasteners like bolts or screws. Its low carbon content makes it easier for welding while its high nickel content enhances weldability even further which enables production runs that are consistent in terms of quality across multiple batches.
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