Hastelloy B-3 (UNS N10675 / W.Nr. 2.4600)
Hastelloy B-3 (UNS N10675 / W.Nr. 2.4600) is a nickel-molybdenum alloy with excellent resistance to pitting, corrosion, and stress-corrosion cracking plus, thermal stability superior to that of alloy B-2. In addition, this nickel steel alloy has great resistance to knife-line and heat–affected zone attack. Alloy B-3 also withstands sulfuric, acetic, formic and phosphoric acids, and other non-oxidizing media. Furthermore, this nickel alloy has excellent resistance to hydrochloric acid at all concentrations and temperatures. Hastelloy B-3’s distinguishing feature is its ability to maintain excellent ductility during transient exposures to intermediate temperatures. Such exposures are routinely experienced during heat treatments associated with fabrication.
Equivalent Grades
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
| Hastelloy B-3 | NS3203 | – | Hastelloy B-3 | N10675 | NiMo29Cr | 2.4600 | – | – | – | – |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Co | Mo | W | Al | Ti | Cu | V | Fe |
| Hastelloy B-3 | ≤0.01 | ≤0.10 | ≤3.00 | ≤0.03 | ≤0.01 | 1.0-3.0 | ≥65.0 | ≤3.00 | 27.0-32.0 | ≤3.00 | ≤0.50 | ≤0.20 | ≤0.20 | ≤0.20 | 1.0-3.0 |
Typical Physical and Mechanical Properties (RT, Solution annealed)
| Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HB |
| 8.08 | 1380-1420 | 885 | 400 | 58 | – |
Available Products and Specifications
| Rod, Bar, Wire and Forgings | ASTM B335, ASME SB335, ASTM B366, ASME SB366, ASTM B564, ASME SB564, ASTM B472, ASME SB472 |
| Plate, Sheet and Strip | ASTM B333, ASME SB333 |
| Pipe and Tube | ASTM B622, ASME SB622, ASTM B619, ASME SB619 |
| Welding Product | AWS A5.11 (ENiMo-10), AWS A5.14 (ERNiMo-10) |
| Others | ASTM B366, ASME SB366, ASTM B564, ASME SB564 |
Features
- Maintains excellent ductility during transient exposures to intermediate temperatures
- Excellent resistance to pitting, corrosion and stress-corrosion cracking
- Excellent resistance to knife-line and heat-affected zone attack
- Excellent resistance to acetic, formic and phosphoric acids and other non-oxidizing media
- Resistance to hydrochloric acid at all concentrations and temperatures
- Thermal stability superior to alloy B-2
Applications
- Acetic acid production, initial phase in presence of iodide catalyst
- Methyl methacrylate production with hot 98 % H2SO4
- Production of herbicides, insecticides, ethylene glycol, ethyl benzene
