From American Ring & Tool Co.
PH15-7 grade stainless steel is categorized as a Precipitation Hardened ("PH") grade of stainless. The PH grades are used to allow fabrication in the soft, annealed condition, with subsequent hardening to the final spring temper required by part function. This material is completely unique as compared to the Austenitic (300 series) or Martensitic (400 series) grades of stainless steel. Austenitic grades cannot be heat treated after fabrication, and the Martensitic grades, although heat treatable, do not make terrific retaining rings. From a purely visual perspective, it is not proper to compare this PH alloy surface to the other grades of stainless steel. 300 and 400 series stainless steel exhibit a bright, shiny, silver color surface. These alloys contain only constituent elements whose oxides are easily reduced using mechanical or chemical means.
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Topics of Interest
One of the features that characterize stainless steels is a minimum 10.5% chromium content as the principal alloying element. Four major categories of wrought stainless steel, based on metallurgical...
Stainless steels are highly corrosion resistant, ferrous alloys that contain chromium and/or nickel additions. There are three basic types of products: austenitic stainless steels, ferritic and...
Iron, nickel, and cobalt-based alloys used primarily for high-temperature applications are known as superalloys. The iron-based grades, which are less expensive than cobalt or nickel-based grades, are...
Martensitic stainless steels are straight-chromium 400-series metals that can be hardened by heat treatment. They are magnetic, resist corrosion in mild environments, and have fairly good ductility.
Tables 4.1A and 4.1B. AISI type 201 austenitic chromium-nickel-manganese steel Tables 4.2A and 4.2B. AISI type 301 austenitic chromium-nickel steel Tables 4.3A and 4.3B. AISI types 302 and 302B...
