Hastelloy B3 (N10675) Bar is a type of bar product made from the nickel-molybdenum alloy Hastelloy B3. It is known for its exceptional resistance to hydrochloric acid at all concentrations and temperatures. The alloy also exhibits excellent resistance to other aggressive chemicals such as sulfuric, acetic, and phosphoric acids.Hastelloy B3 bars are commonly used in environments where reducing and oxidizing conditions are encountered in process streams. They are utilized in industries such as chemical processing, petrochemical, pharmaceutical, and marine engineering, where corrosion resistance and high-strength properties are crucial.
(1) The elongation of Hastelloy B3 material is relatively high, which creates favorable conditions for cold press forming.
(2) Hastelloy B3 material is harder than austenitic stainless steel and has a more obvious work hardening tendency, so it requires greater pressure during cold forming, or step-by-step forming.
(3) Cold forming with severe deformation will increase the yield-strength ratio of Hastelloy B3 material and increase the susceptibility to stress corrosion and cracks. Intermediate and final heat treatment processes are often used.
(4) When the cold forming deformation rate of Hastelloy B3 material is less than 10%, it will not affect the corrosion resistance of the workpiece. However, during the welding process, the presence of residual stress may cause hot cracks in the weld. Therefore, for workpieces that need to be welded later, the influence of residual stress should be eliminated as much as possible.
(5) In the 600-800°C range, if the heating time is too long, Hastelloy B3 alloy will produce a brittle phase, resulting in reduced elongation. Moreover, when external force or deformation is limited in this temperature range, hot cracks are prone to occur. Therefore, when using hot forming, the temperature must be controlled above 900°C.
(6) Hastelloy B3 material is very sensitive to oxidizing media and sulfur, phosphorus, lead and other low melting point metals at high temperatures.
(7) Before processing and pressing the Hastelloy B3 material, the surface of the mold in contact with the workpiece should be cleaned; during cold working, lubrication methods can be used, and degreasing or alkali cleaning must be performed immediately after forming.
(8) After the workpiece is water-cooled, the oxide film on the surface will be thicker and should be fully pickled. If there is an oxide film remaining, cracks may occur during the next pressing; if necessary, sandblasting can be performed before pickling.
Post time: Nov-01-2023