Alloy B2 Fasteners

Alloy 2507 is the most popular of the nitrogen-strengthened duplex alloys. It has corrosion resistant equivalent to the 6% molybdenum alloys, such as AL6XN®. The minimum pitting resistance number for this material is 42. Depending on the source, a minimum pitting resistance number of 32 to 40 is required for service in seawater. Compared to 316L stainless, it can range from 2 to 3 times as strong. The primary Alloy 2507 fasteners that Nickel Systems stocks are hex bolts and hex nuts in 1/2-13, 5/8-11, & 3/4-10 diameters. Other items in stock, which include socket cap screws, socket set screws and dowel pins, are primarily overruns from previous orders.

Hastelloy B2 (® Haynes International)
AL B2 (® Allegheny Technologies Inc)
Nickelvac H-B-2 (® Allegheny Technologies Inc.)
Nicrofer 6928 (® Thyssen Krupp VMD)

Primary Resistance

ASTM B333, ASME SB333 (Plate)
ASTM B335, ASME SB335 (Bar)
UNS N10665
W-Nr 2.4167

Typical Tensile Strength (at room temperature in KSI)

Typical Chemistry (% by weight)
C .02, Co .08, Cr .5, Fe 1, Mn .07, Mo 28, Ni 69, P .02, S .015, Si .05