Stainless steel duplex stainless steels are achieved with an overall lower alloy content than similar-performing super-austenitic grades, making their use cost-effective for many applications. Duplex grades are characterized into groups based on their alloy content and corrosion resistance. Precipitation hardening stainless steels have corrosion resistance comparable to austenitic varieties, but can be precipitation hardened to even higher strengths than the other martensitic grades. The most common, 17-4PH, uses about 17% chromium and 4% nickel. The designation "CRES" is used in various industries to refer to corrosion-resistant steel. Most mentions of CRES refer to stainless steel, although the correspondence is not absolute, because
Sharon Steel Corporation the Sharon Steel Hoop Corporation in 1933. Aided by improvement in business conditions, the Sharon Steel continued to expand its sales volume and to make further improvements in production facilities during the thirties. Equipment for the production of terne and tin coating was added, a new product under the trade name of “Galvanite” was produced, and other specialties were added to the company's line of products. New electric furnaces were installed at the Lowellville Works to make stainless steel ingots to be converted into stainless steel strip on the Sharon finishing mills. A great change came about in the company