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Hastelloy B-2 Alloy

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Common Trade Names: 
Hastelloy B2, Alloy B2; Nimofer 6928

Alloy B2 (UNS N10665 / W.Nr. 2.4617) is a solid solution strengthened, nickel-molybdenum alloy, typically used in extreme reducing conditions. B2 has significantly lower carbon, silicon and iron compared to its’ predecessor, Alloy B (UNS N10001), making the alloy less susceptible to decreased corrosion resistance in the weld zone, in the as-welded condition. Controlling other alloying elements such as iron and chromium
solved other issues concerning fabricability. Stringent chemistry control along with years of development has resulted in the alloy used today, both in Alloy B2 and Alloy B-3 Today, Alloy B2 with restricted chemistry can be used in the welded condition and is less susceptible to SCC under many conditions. As always, care must taken in selecting the right alloy for the desired application.

Alloy B2 should not be used at temperatures between 1000°F and 1600°F as the alloy forms secondary phases that could decrease the ductility of the material.

Available Product Forms: 
Plate, Sheet, Bar, Pipe

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Specifications


Hastelloy B-2 is covered by the following specifications:

UNS N10665

Plate, Sheet, Strip: ASTM B333, ASME SB333,

Bar: ASTM B 335, ASME SB335, (DUAL CERTIFIED TO ASTM B564, ASME 
SB564 ON 3-1/2 DIA. AND UP)

Welded Pipe: ASTM B619, ASME SB619, CLASS I or II, (ABOVE 8" SCH 40)  ASTM 
B775, ASME SB775,

Seamless Pipe: ASTM B622, ASME SB622

Trademark Notice: Some names are trade names and/or trademarks of specific manufacturers. American Special Metals, Corp. is not affiliated with any manufacturer(s). Orders will be filled to meet specifications from any available source(s). Names are listed solely for reference to help identify products consistent with listed specifications.

Hastelloy B-2 is a Registered Trademarks of Haynes International and Its subsidiaries.

Chemical Composition

Ni................ Balance
Cr................1.00 Max.
Mo............. 26.0 to 30.0
Mn..............1.00 Max.
Fe............... 2.00 Max.
Si.................0.10 Max.
C................ 0.02 Max.
P..................0.040 Max.
Co.............. 1.00 Max.
S..................0.030 Max.
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