MANY times a product that solves one problem creates a few others. Whether the product survives depends on whether its advantages-does it save time, reduce cost, improve quality?-outweigh its disadvantages. The P5B grade of P91, an alloy introduced in the late 1970s, is such a product. The primary alloying elements in P91 steels are chromium, molybdenum, manganese, silicon, and vanadium (maximum 9.5Cr-1.05Mo-0.6Mn-0.5Si-0.25V), and this combination solved sever-al problems for the power generation and petrochemical industries. This steel family is much more durable than competing alloys. It has good corrosion resistance rates and it withstands heat and pressure. However, it's not as easy to fabricate as other materials.
展开▼
