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.

 

Available Forms of Hastelloy B-3 at Rooplaxmi Steels:

•           Sheet
•           Plate
•           Bar
•           Pipe (welded & seamless)
•           Fittings
•           Wire

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

 

Hastelloy B-3 Chemical Composition, %:

Ni	Mo	Fe	C	Co	Cr	Mn	Si
65.0 min	28.5	1.5	0.01 max	3.0 max	1.5	3.0 max	0.10 max

           

Ti	W	Al	Cu
0.2 max	3.0 max	0.50 max	0.20 max

 

Application of Hastelloy B-3:

•           Chemical processes
•           Vacuum furnaces
•           Mechanical components in reducing environments

Machining and Fabrication with Hastelloy B-3:

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.

Hastelloy B-3 ASTM Specification:

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

 

Mechanical Properties of Hastelloy B-3:

Annealed Typical

Ultimate tensile strength	125 ksi or 860 Mpa
Yield strength	(0.2% offset) 60 ksi (420 MPa)
Elongation	50 %