Specifications
- Plate, Sheet & Strip: ASTM B333, ASME SB333
- Rod & Bar: ASTM B335, ASME SB335
Hastelloy® B2, also known as alloy UNS N10665 or Alloy B2, is a nickel-molybdenum alloy with exceptional resistance to hydrochloric acid at all concentrations and temperatures. It also offers resistance to sulfuric, acetic and phosphoric acids, making it highly suitable for applications in chemical processing industries, particularly in environments where corrosion is a concern.
Nickel Systems is a true stocking distributor of fasteners made from Alloy B2 and other exotic alloys. We offer quick turnaround and expert support to help you choose the ideal fasteners for your applications. Contact us today to learn more.
Hastelloy® B2’s unique characteristics make it indispensable in various industrial and chemical applications. If you miss the answer to your question in the information below, download the complete technical data sheet here.
| Physical Properties | Temp., °F | Imperial Units | Temp., °C | Metric Units |
|---|---|---|---|---|
| Density | 72 | 0.333 lb./in.3 | 22 | 9.22 g/cm3 |
| Electrical Resistivity | 32 | 54.1 microhm-in. | 0 | 1.37 microhm-m |
| 212 | 54.3 microhm-in. | 100 | 1.38 microhm-m | |
| 392 | 54.5 microhm-in. | 200 | 1.38 microhm-m | |
| 572 | 54.6 microhm-in. | 300 | 1.39 microhm-m | |
| 752 | 54.8 microhm-in. | 400 | 1.39 microhm-m | |
| 932 | 55.6 microhm-in. | 500 | 1.41 microhm-m | |
| 1112 | 57.6 microhm-in. | 600 | 1.46 microhm-m | |
| Mean Coefficient of Thermal Expansion | 68-200 | 5.7 microinches/in.-°F | 20-93 | 10.3 x 10-6m/m•K |
| 68-400 | 6.0 microinches/in.-°F | 20-204 | 10.8 x 10-6m/m•K | |
| 68-600 | 6.2 microinches/in.-°F | 20-316 | 11.2 x 10-6m/m.K | |
| 68-800 | 6.4 microinches/in.-°F | 20-427 | 11.5 x 10-6m/m.K | |
| 68-1000 | 6.5 microinches/in.-°F | 20-538 | 11.7 x 10-6m/m.K | |
| Thermal Conductivity | 32 | 77 Btu-in./ft.2-hr.-°F | 0 | 11.1 W/m•K |
| 212 | 85 Btu-in./ft.2-hr.-°F | 100 | 12.2 W/m•K | |
| 392 | 93 Btu-in./ft.2-hr.-°F | 200 | 13.4 W/m•K | |
| 572 | 102 Btu-in./ft.2-hr.-°F | 300 | 14.6 W/m•K | |
| 752 | 111 Btu-in./ft.2-hr.-°F | 400 | 16.0 W/m•K | |
| 932 | 120 Btu-in./ft.2-hr.-°F | 500 | 17.3 W/m•K | |
| 1112 | 130 Btu-in./ft.2-hr.-°F | 600 | 18.7 W/m•K | |
| Thermal Diffusivity | 32 | 0.005 in.2/sec. | 0 | 3.2 × 10-6m¾/s |
| 212 | 0.005 in.2/sec. | 100 | 3.4 × 10-6m¾/s | |
| 392 | 0.006 in.2/sec. | 200 | 3.6 × 10-6m¾/s | |
| 572 | 0.006 in.2/sec. | 300 | 3.8 × 10-6m¾/s | |
| 752 | 0.006 in.2/sec. | 400 | 4.0 × 10-6m¾/s | |
| 932 | 0.007 in.2/sec. | 500 | 4.2 × 10-6m¾/s | |
| 1112 | 0.007 in.2/sec. | 600 | 4.5 × 10-6m¾/s | |
| Specific Heat | 32 | 0.089 Btu/lb.-°F | 0 | 373 J/kg•K |
| 212 | 0.093 Btu/lb.-°F | 100 | 389 J/kg•K | |
| 392 | 0.097 Btu/lb.-°F | 200 | 406 J/kg•K | |
| 572 | 0.101 Btu/lb.-°F | 300 | 423 J/kg•K | |
| 752 | 0.103 Btu/lb.-°F | 400 | 431 J/kg•K | |
| 932 | 0.106 Btu/lb.-°F | 500 | 444 J/kg•K | |
| 1112 | 0.109 Btu/lb.-°F | 600 | 456 J/kg•K |
| Form | Condition | Test Temp. °F (°C) |
Ultimate Tensile Strength, Ksi (MPa) |
Yield Strength at 0.2% offset, Ksi (MPa) |
Yield Strength at 0.2% offset, Ksi (MPa) |
Hardness, Rockwell |
|---|---|---|---|---|---|---|
| Sheet, (bright annealed) | Heat-treated at 2100°F (1149°C, hydrogen cooled |
Room | 132.5 (914) | 57.5 (396) | 55 | B-98 |
| Sheet and Plate,0.100 to 0.350 in. (2.5 to 8.9 mm) thick | Heat-treated at 1950°F (1066°C), rapid quenched | Room* | 129.7 (894) | 59.8 (412) | 61 | B-95 |
| 400 (204)* | 400 (204)* | 50.8 (350) | 59 | – | ||
| 600 (316)* | 119.3 (823) | 47.5 (328) | 60 | – | ||
| 800 (427)* | 116.9 (806) | 44.9 (310) | 60 | – | ||
| Plate, 0.360 to 2 in. (9.1 to 51 mm) thick |
Heat-treated at 1950°F (1066°C), rapid quenched |
Room | 130.9 (902) | 59.0 (407) | 61 | B-94 |
| 400 (204)2 | 126.2 (871) | 52.3 (361) | 60 | – | ||
| 600 (316)2 | 121.8 (840) | 48.8 (336) | 60 | – | ||
| 800 (427)2 | 119.3 (823) | 46.3 (319) | 61 | – | ||
| Plate, 1/4 in. (6.4 mm) thick |
As manual gas tungsten arc welded | Room | 124.0 (855) | – | – | – |
| Manual gas tungsten arc welded3 | Room | 118.5 (817) | – | – | – | |
| *Average of 73 tests. | 1Average of 33-34 tests. | 2Average of 18 tests. | 3Heat-treated at 1950°F (1066°C), rapid quenched. | |||
| Form | Condition | Test Temp °F (°C) | Dynamic Modulus of Elasticity 106 psi (GPa) |
|---|---|---|---|
| Plate 1/2 in. (12.7 mm) thick | Heat-treaded at: 1950°F ( 1066°C), rapid quenched | Room | 31.4(217) |
| 600 (316) | 29.3 (202) | ||
| 800 (427) | 28.4 (196) | ||
| 1000 (538) | 27.4(189) |
| Aging Temp., oF (°C) | Aging Time, min. | Elongation in 2 in. (50.8 mm), percent |
|---|---|---|
| 1300 (704) | 1 | 48 |
| 5 | 39 | |
| 1 | 27 | |
| 30 | 13 | |
| 1350 (732) | 1 | 48 |
| 5 | 14 | |
| 10 | 17 | |
| 30 | 7 | |
| 1400 (760) | 1 | 44 |
| 5 | 14 | |
| 10 | 3 | |
| 30 | 2 | |
| 1450(788) | 1 | 45 |
| 5 | 11 | |
| 10 | 4 | |
| 30 | 3 | |
|
*0.180 in. (4.6 mm) in thickness. |
||
| Media | Concentration, percent by weight | Average Corrosion Rate per year | |
|---|---|---|---|
| mils | mm | ||
| Acetic Acid | 10 | 0.5 | < 0.02 |
| 30 | 0.4 | 0.01 | |
| 50 | 0.4 | 0.01 | |
| 70 | 0.3 | < 0.01 | |
| 99 (Glacial) | 0.3 | < 0.01 | |
| Formic Acid | 10 | 0.3 | < 0.01 |
| 20 | 0.6 | <0.02 | |
| 30 | 0.7 | <0.02 | |
| 40 | 0.7 | <0.02 | |
| 60 | 0.5 | <0.02 | |
| 89 | 0.5 | <0.02 | |
| Hydrochloric Acid | 1 | 0.8 | 0.02 |
| 2 | 3 | 0.08 | |
| 5 | 5 | 0.13 | |
| 10 | 7 | 0.18 | |
| 15 | 11 | 0.28 | |
| 20 | 15 | 0.38 | |
| 20 | 20** | 0.51** | |
| Phosphoric Acid (Chemically Pure) | 10 | 2 | 0.05 |
| 30 | 3 | 0.08 | |
| 50 | 6 | 0.15 | |
| 85 | 25 | 0.63 | |
| Sulfuric Acid | 2 | 0.5 | < 0.02 |
| 5 | 3 | 0.08 | |
| 10 | 2 | 0.05 | |
| 20 | 0.7 | < 0.02 | |
| 30 | 0.7 | < 0.02 | |
| 40 | 0.9 | < 0.03 | |
| 50 | 1 | 0.03 | |
| 50 | 2** | 0.05** | |
| 50 | 1*** | 0.03*** | |
| 60 | 2 | 0.05 | |
| 70 | 9 | 0.23 | |
*Determined in laboratory tests of 120 hours duration. It is not recommended that samples be tested under actual plant conditions, All test specimens were treated at 1950°F (1066°C), water quelched unless otherwise notes. **As gas tungsten arc welded. ***Aged 48 hours at 1000°F (538°C).
| Cold Reduction, percent | Average Corrosion Rate Per Year | Hardness, Rockwell | |
|---|---|---|---|
| mils | mm | ||
| (as solution heat-treated) | 14 | 0.36 | B-92 |
| 10 | 14 | 0.36 | C-32 |
| 20 | 14 | 0.36 | C-38 |
| 30 | 13 | 0.33 | C-43 |
| 40 | 14 | 0.36 | C-44 |
| 50 | 14 | 0.36 | C-45 |
| Form | Condition | Average Olsen Depth | |
|---|---|---|---|
| Sheet, 0.063 in. (1.6 mm) thick | Heat-treaded at: 1950°F ( 1066°C), rapid quenched | in. | mm |
| 0.57 | 14.5 | ||
Alloy B2 is desirable for applications that need to withstand reducing chemicals and intergranular corrosion.
UNS N10665 is a nickel-molybdenum alloy with excellent corrosion resistance in reducing environments. It provides superior resistance to hydrochloric, phosphoric, sulfuric and acetic acids. Its nickel-rich composition makes it effective in pure acid environments. It protects components against pitting and stress-corrosion cracking.
It is also valuable due to its ability to maintain structural integrity after welding by resisting grain boundary carbide precipitation in weld heat-affected zones. However, this alloy should not be used in environments with oxidizing agents or reducing media contaminated with oxidizing salts such as ferric oxide. These chemicals accelerate its corrosion significantly.
Alloy B2 is a unique alloy because it contains very little chromium compared to almost all other corrosion-resistant alloys. The following are its chemical constituents as per ASTM standards:
Hastelloy® B2 is also known by several other names:
Hastelloy® B2 is often compared with Hastelloy® C276, another high-performance material in the same family. Both these materials offer superior corrosion resistance but in different environments. Hastelloy® B2 is more effective in environments with reducing chemicals, while Hastelloy® C276 is resistant to numerous corrosive agents, including oxidizing media, reducing and organic acids.
Alloy B2 is highly valued in many industries due to its ability to resist chemicals in reducing environments where other materials may degrade rapidly. It is often utilized in chemical reactors, heat exchangers, valves and piping systems where resistance to corrosion and stress cracking is essential. Its versatility and durability make it a preferred choice in harsh chemical environments, providing long-term reliability and safety.
Nickel Systems supplies an extensive range of nickel-molybdenum alloy B2 fasteners:
Nickel Systems offers premium Alloy B2 fasteners manufactured to ASTM standards to meet the demands of severe chemical and high-temperature environments. We offer same-day shipping for standard products, and our specialists are available to offer expert assistance to help you find the most suitable products for your applications. Contact us today for a free quote.
