February 2019

Special Focus: Materials Manufacturing

Hyper-duplex stainless steel can improve on duplex steel and nickel-based superalloy

Duplex materials have been around for a long time.

Vieira, B., Sandvik Materials Technology

Duplex materials have been around for a long time. They are used in the chemical and petrochemical industries, particularly where chloride-bearing solutions necessitate corrosion resistance. However, a new, proprietary, hyper-duplex stainless steela (UNS S32707) can be used as an alternative to established duplex grades and high-nickel (Ni) alloys. FIG. 1. Yield strength of various stainless steels including the duplex and hyper-duplex grades. Using hyper-duplex stainless-steel grades presents several advantages, both in terms of superior mechanical properties and resistance to damage. The chief benefits can be summarized as: higher yield stren

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