Hastelloy B3 Hydrogen Alloy DIN Stainless Round Bar
Hastelloy B-3 is a nickel-molybdenum alloy with excellent
resistance to pitting, corrosion and stress corrosion cracking, and
its thermal stability is better than that of alloy B-2. In
addition, this nickel-steel alloy is highly resistant to erosion of
the blade line and heat-affected zone. Alloy B-3 can also withstand
sulfuric acid, acetic acid, formic acid, phosphoric acid and other
non-oxidizing media. In addition, this nickel alloy has excellent
hydrochloric acid resistance at all concentrations and
temperatures. The distinguishing feature of Hastelloy B-3 is its
ability to maintain excellent ductility during transient exposure
to intermediate temperatures. This type of exposure is commonly
experienced during heat treatment associated with manufacturing.
Limiting factors of Hastelloy B-3
Alloy B-3 has poor corrosion resistance to oxidizing environments.
Therefore, it is not recommended to use it in oxidizing media or
where iron or copper salts are present, as they may cause rapid
premature corrosion failure. These salts may be produced when
hydrochloric acid comes into contact with iron and copper.
Therefore, if this nickel-steel alloy is used with iron or copper
pipes in a system containing hydrochloric acid, the presence of
these salts may cause the alloy to fail prematurely.
Characteristics
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 | 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 |
Applications
Chemical processes
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.
