ASTM B366 UNS N10675 LAP JOINT STUB END DN50 SCH10S 150# B16.9 STEEL SEAMLESS FITTING

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Scope

The specification of ASTM B366 covers wrought welding fittings for pressure piping, factory-made from nickel and nickel alloys. Threaded fittings as covered in ASME B16.11 are also covered by this specification. The term welding applies to butt-welding or socket-welding parts such as 45 and 90o elbows, 180o bends, caps, tees, reducers, lap-joint stub ends, and other types, as covered by ASME B16.9, ASME B16.11, ASME B16.28, MSS SP-43, MSS SP-95, and MSS SP-97.

UNS N10675 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.

Characters

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

Application

Chemical processes

Vacuum furnaces

Mechanical components in reducing environment

Chemical composition (%)

Ni≥65,Mo=27-32,Co≤3,Mn≤3,W≤3,Fe=1-3,Cr=1-3,Al≤0.5,Cu≤0.2,Nb≤0.2,Ta≤0.2,Ti≤ 0.2,V≤0.2,Zr≤0.1,P≤0.03,S≤0.01,C≤0.01