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Hastelloy B2 (UNS N10665/W.Nr. 2.4617) is a solid solution strengthened nickel molybdenum alloy that exhibits significant resistance to reducing environments such as hydrogen chloride gas, sulfuric acid, acetic acid and phosphoric acid. Molybdenum is a major alloying element that provides significant corrosion resistance in reducing environments. This nickel alloy can be used in the as-welded condition because it resists the formation of grain boundary carbide deposits in the weld heat-affected zone.
In addition, Hastelloy B2 has excellent resistance to pitting corrosion, stress corrosion cracking, and knife line and heat-affected zone attacks. Alloy B2 supports resistance to pure sulfuric acid and many non-oxidizing acids.
Hastelloy B2 is suitable for most chemical process applications in the as-welded state. Ideal for equipment that handles hydrochloric acid of various concentrations and temperatures. Resistant to hydrogen chloride gas and sulfuric acid, acetic acid and phosphoric acid.
The main high temperature applications are those requiring a low coefficient of thermal expansion. Exposure to temperatures between 540 and 815°C (1000-1500°F) should be avoided as the ductility of the alloy decreases. In oxidizing gases such as air, Hastelloy B2 can be used at temperatures up to 540°C (1000°F). In reducing gas or vacuum, the alloy can be used at 815°C (1500°F) to higher temperatures. When hydrochloric acid comes into contact with iron or copper, iron or copper salts may be formed, therefore Hastelloy B2 should not be used with copper or iron piping in systems containing hydrochloric acid.
Grade | Mo | Fe≤ | C≤ | Co≤ | Cr≤ | Mn≤ | Si≤ | P≤ | S≤ | Ni |
Hastelloy B2 | 26.0-30.0 | 2.00 | 0.02 | 1.00 | 1.00 | 1.00 | 0.10 | 0.04 | 0.03 | Remainder |
Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) |
110[760] | 51[350] | 40 |
| Products | Standards | Show |
| Hastelloy B2 Bars | ASTM B335 |  |
| Hastelloy B2 Sheets/Plates | ASTM B333, A480 |  |
| Hastelloy B2 Welded Pipe | ASTM B619, B775 |  |
| Hastelloy B2 Seamless Pipe | ASTM B622 |  |
| Hastelloy B2 Welded Tube | ASTM B626 |  |
| Hastelloy B2 Fittings | ASTM B366 |  |
| Hastelloy B2 Forgings | ASTM B564 |  |
Grade | Density Room Temp. | Melting Range | Specific Heat 68°F | Elastic Modulus 68°F | Thermal Conductivity 68°F |
Hastelloy B2 | 0.333lb/in3 | 2430°F to 2520°F | 0.090Btu/lb. °F | 31.4*106psi | 64Btu/ft.h.°F |
STANDARD | WERKSTOFF NR. | UNS | EN |
Hastelloy B2 | 2.4617 | N10665 | NiMo28 |
Corrosion Resistance:
Regarding general corrosion, Hastelloy B2 alloy's resistance to inorganic acids such as hydrochloric acid, sulfuric acid, and phosphoric acid is essentially the same as that of Hastelloy B alloy. However, its corrosion resistance is generally superior to that of Hastelloy B alloy, particularly after welding. In 20% boiling hydrochloric acid, even cold working deformation of Hastelloy B2 up to 50% does not affect its corrosion resistance.
Regarding intergranular corrosion, due to the lower carbon, silicon, and iron contents of Hastelloy B2 alloy, the carbides and intermetallic phases in the sensitized steel are far less than those in Hastelloy B alloy. Therefore, this alloy exhibits superior resistance to intergranular corrosion.
Regarding stress corrosion, tests have shown that when Hastelloy B2 alloy contains low residual Fe ≤ 2% and Cr ≤ 1.0%, the stress corrosion resistance of the latter alloy is superior to that of the same alloy with appropriately controlled Fe and Cr contents after medium-temperature aging.
Mechanical Properties:
The ductility of Hastelloy B2 alloy decreases and worsens with aging. This is due to the precipitation of the hard and brittle β phase during the intermediate-temperature aging process.
Weldability:
Hastelloy B2 alloy offers excellent weldability. Due to its low carbon, silicon, and iron content, it exhibits superior resistance to post-weld intergranular corrosion and knife-edge corrosion compared to Hastelloy B. When the iron and chromium content is properly controlled, Hastelloy B2's ductility, toughness, corrosion resistance, and weldability are further enhanced. Therefore, Hastelloy B2 generally does not require post-weld heat treatment. This alloy is more suitable for manufacturing welding equipment and components than Hastelloy B.
Heat Treatment:
Except for applications specified otherwise, this alloy requires solution treatment at 1066°C before use. Unless the Fe+Cr content in the alloy is carefully controlled, prolonged use at temperatures between 538°C and 816°C is generally not permitted.
Food Processing Industry
Fabrication Industry
Oil and Gas Industry
Chemical Industry
Plumbing
General Purpose Applications
Water supply Systems
Power Plant
Paper & Pulp Industry
