17-7PH is a 18-8CrNi developed on the basis of the austenitic - martensitic precipitation hardening stainless steel, stainless steel, also known as phase-change control. After solution treatment for the unstable austenite, good toughness and processing of plastic, after adjustments, the composition of austenite precipitated carbide climate change, through the martensite transformation process, most of the organization into a toughness better low-carbon martensite, the use of steel in this state for the state, good mechanical properties in temperature. Corrosion resistance than martensitic stainless steel generally.
17-7PH chemical composition: carbon (C) ≤ 0.09, manganese (Mn) ≤ 1.00, Nickel (Ni) 6.50 ~ 7.75, silicon (Si) ≤ 1.00, phosphorus (P) ≤ 0.035, sulfur (S) ≤ 0.030, Cr (Cr) 16.00 ~ 18.00, aluminum (Al) 0.75 ~ 1.50 [1]
17-7PH is a 18-8CrNi developed on the basis of the austenitic - martensitic precipitation hardening stainless steel, stainless steel, also known as control in disguise. After solution heat treatment of unstable austenite, with good toughness of plastic and processing of, after the adjustment, precipitation of carbides the austenite composition climate change, through the martensite transformation process, most of the organization into a toughness of low carbon martensite, the use of steel in this state state, there is a good medium temperature mechanical properties. Corrosion resistance than martensitic stainless steel generally. In the late 1990s, Shanghai Ci Dong alloy steel production to focus on this promotion.