Overview
Hastelloy B-3 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.
Specification
ASTM B622 Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube.
| Pipe Smls | Pipe Welded | Tube Smls | Tube Welded | Sheet / Plate | Bar | Forging | Fitting |
| B622 | B619 | B622 | B626 | B333 | B335 | B564 | B366 |
| Standards | Desciption |
| ASTM B333 | Standard Specification for Nickel-Molybdenum Alloy Plate, Sheet, and Strip |
| ASTM B335 | Standard Specification for Nickel-Molybdenum Alloy Rod |
| ASTM B366 | Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings |
| ASTM B564 | Standard Specification for Nickel Alloy Forgings |
| ASTM B619 | Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Pipe |
| ASTM B622 | Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube |
| ASTM B626 | Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Tube |
| ASTM B704 | Standard Specification for Welded Alloy Tubes |
| ASTM B705 | Standard Specification for Nickel-Alloy Welded Pipe |
Applications
1. Chemical processes
2. Vacuum furnaces
3. Mechanical components in reducing environments
Chemical Composition
| Ni | Mo | Fe | C | Co | Cr | Mn | Si | Ti | W | Al | Cu |
| 65.0 min | 28.5 | 1.5 | .01 max | 3.0 max | 1.5 | 3.0 max | .10 max | .2 max | 3.0 max | .50 max | .20 max |
Characteristics
1. Maintains excellent ductility during transient exposures to intermediate temperatures.
2. Excellent resistance to pitting, corrosion and stress-corrosion cracking.
3. Excellent resistance to knife-line and heat-affected zone attack.
4. Excellent resistance to acetic, formic and phosphoric acids and other non-oxidizing media.
5. Resistance to hydrochloric acid at all concentrations and temperatures.
6. Thermal stability superior to alloy B-2.
