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Hastelloy^® B-2

UNS Number N010665

Other common names: Alloy B-2

Hastelloy B-2 is a solid solution strengthened, nickel-molybdenum alloy, with significant resistance to reducing environments like hydrogen chloride gas, and sulfuric, acetic and phosphoric acids. Molybdenum is the primary alloying element which provides significant corrosion resistance to reducing environments. This nickel steel alloy can be used in the as-welded condition because it resists the formation of grain-boundary carbide precipitates in the weld heat-affected zone.

This nickel alloy provides excellent resistance to hydrochloric acid at all concentrations and temperatures. In additions, Hastelloy B-2 has excellent resistance to pitting, stress corrosion cracking and to knife-line and heat-affected zone attack. Alloy B-2 provides resistance to pure sulfuric acid and a number of non-oxidizing acids.

Limiting Factors of Hastelloy B-2

Alloy B-2 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 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 addition, this nickel steel alloy should not be used at temperatures between 1000° F and 1600° F because of a reduction in the ductility in the alloy.

In what forms is Hastelloy B-2 Available at Mega Mex?

• Sheet
• Plate
• Bar
• Pipe & Tube (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-2?

• Great resistance to stress corrosion cracking and pitting
• Significant resistance to reducing conditions like hydrogen chloride, sulfuric, acetic and phosphoric acids
• Resistance to hydrochloric acid at all concentrations and temperatures

Chemical Composition, %

Ni	Mo	Fe	C	Co	Cr	Mn	Si
Balance	26.0-30.0	2.0 max	.02 max	1.0 max	1.0 max	1.0 max	.10 max
P	S
.040 max	.030 max

In what applications is Hastelloy B-2 used?

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

For information on machining, click here.

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	110	51	40
Sheet/Plate	110	51	40
Welded Pipe & Tube	110	51	40
Seamless Pipe & Tube	110	45	40