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    Hastelloy B-3

    HASTELLOY® B-3

    UNS Number N010675

    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.

    Limiting Factors of Hastelloy B-3

     

    Alloy B-3 has poor corrosion resistance to oxidizing environments, therefore, it is not recommended for use in oxidizing media or in the presence of ferric or cupric salts because they may cause rapid premature corrosion failure. These salts may develop when hydrochloric acid comes in contact with iron and copper. Therefore, if this nickel steel alloy is used in conjunction with iron or copper piping in a system containing hydrochloric acid, the presence of these salts could cause the alloy to fail prematurely.

     

    In what forms is Hastelloy B-3 Available?

    Sheet
    Plate
    Bar
    Pipe (welded & seamless)
    Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)
    Wire

     

    What are the characteristics of Hastelloy B-3?

    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 


     

    Chemical Composition, %

    Ni
    Mo
    Fe
    C
    Co
    Cr
    Mn
    Si
    65.0 min
    28.5
    1.5
    .01 max
    3.0 max
    1.5
    3.0 max
    .10 max
    Ti
    W
    Al
    Cu
     
     
     
     
    .2 max
    3.0 max
    .50 max
    .20 max
     
     
     
     

     

    In what applications is Hastelloy B-3 used?

    Chemical processes
    Vacuum furnaces
    Mechanical components in reducing environments
     

    Fabrication with Hastelloy B-3

    Problems associated with fabrication of alloy B-2 components should be minimized with alloy B-3 due to its improved thermal stability. A low carbon content permits alloy B-3 to be used in the as-welded condition. Hastelloy B-3 has good overall forming and welding characteristics. This alloy can be forged or otherwise hot-worked, providing that it is held at 2250° F for a sufficient amount of time to bring the entire piece to temperature. Since it is a low carbon alloy, the use of lower hot finishing temperatures may be necessary to achieve grain size control. It may also be formed by cold working. Although it does work-harden somewhat rapidly, B-3 alloy components can be made using all common cold forming techniques. All common welding techniques may be used with alloy B-3, however, oxyacetylene and submerged arc welding processes are not recommended when the fabricated item is to be used in corrosive service.

     

    ASTM Specifications

    Pipe Smls
    Pipe Welded
    Tube Smls
    Tube Welded
    Sheet/Plate
    Bar
    Forging
    Fitting
    B622
    B619
    B622
    B626
    B333
    B335
    B564
    B366

     

    Mechanical Properties 
    Annealed Material

    Product Tensile Min. (ksi) .2% Yield Min. (ksi) Elongation Min.
    Rod & Bar      
    Sheet/Plate      
    Welded Pipe & Tube      
    Seamless Pipe & Tube      

     

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