Equivalent designations UNS N10665 DIN W. Nr. 2.4617 Form ASTM Rod B 335 Plate, sheet and strip B 333, B 906 Seamless pipe and tube B 622 Welded pipe B 619, B 775 Welded tube B 626, B 751 Welding fitting B 366 Forged or rolled pipe flange and forged fitting B 462 Billet and bar for reforging B 472 Forging B 564 Chemical composition % Ni Mo Fe Cr Co C Mn Si P S min balance 26.0 max 30.0 2.0 1.00 1.00 0.020 1.00 0.10 0.040 0.030 Physical properties Density 9.22 g/cm3 Melting range 1330-1380℃ Features: Hastelloy B-2 has outstanding resistance to hydrochloric acid at all concentrations and temperatures. It also has significant resistance to reducing environments like sulfuric, phosphoric, acetic acids and other nonoxidizing media. Hastelloy B-2 has excellent resistance to pitting corrosion, stress corrosion cracking, and knife line and weld heat-affected zone attack. Hastelloy B-2 has poor resistance to oxidizing environments, therefore, it should not be used where ferric or cupric salts are present as these salts may cause rapid corrosion failure. Applications: Equipment handling reducing chemical environments; and chemical process industry involving hydrochloric, sulfuric, phosphoric and acetic acids.