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17-7PH is a Precipitation-Hardening Standard grade Stainless Steel. It is composed of (in weight percentage) 0.09% Carbon (C), 1.00% Manganese (Mn), 1.00% Silicon (Si), 16.0-18.0% Chromium (Cr), 6.5-7.75% Nickel (Ni), 0.04% Phosphorus (P), 0.03% Sulfur (S), 0.75-1.5% Aluminum (Al), and the base metal Iron (Fe). Other designations of 17-7PH stainless steel include UNS S17700 and AISI 631.
Steel is the common name for a large family of iron alloys. Steels can either be cast directly to shape, or into ingots which are reheated and hot worked into a wrought shape by forging, extrusion, rolling, or other processes. Wrought steels are the most common engineering material used, and come in a variety of forms with different finishes and properties. Stainless steels are high-alloy steels that have superior corrosion resistance than other steels because they contain large amounts of chromium. Stainless steels contains at least 10% chromium, with or without other elements. Stainless steels can be divided into three basic groups based on their crystalline structure: austenitic, ferritic, and martensitic.
The typical elastic modulus of stainless steels at room temperature (25°C) ranges from 190 to 210 GPa. The typical density of stainless steels ranges from 7.75 to 8.1 g/cm3. The typical tensile strength varies between 515 and 827 MPa. The wide range of ultimate tensile strength is largely due to different heat treatment conditions.
Other common Stainless steels include 15-5PH, 17-10P, 17-4PH, 18-18-2, 18-18PlusTM, 18-2FM, 18SR, 20Cb-3TM, 26-1Ti, 29-4, 29-4-2, 904L, AISI S30430, AISI Type 201, AISI Type 202, AISI Type 205, AISI Type 216, AISI Type 301, AISI Type 302, AISI Type 302B, AISI Type 302Cu, AISI Type 303, AISI Type 303PlusX, AISI Type 303Se, AISI Type 304, AISI Type 304H, AISI Type 304HN, AISI Type 304L, AISI Type 304LN, AISI Type 304N, AISI Type 305, AISI Type 308, AISI Type 308L, AISI Type 309, AISI Type 309Cb+Ta, AISI Type 309S, AISI Type 309SCb, AISI Type 310, AISI Type 310S, AISI Type 312, AISI Type 314, AISI Type 316, AISI Type 316F, AISI Type 316H, AISI Type 316L, AISI Type 316LN, AISI Type 316N, AISI Type 317, AISI Type 317L, AISI Type 317LM, AISI Type 321, AISI Type 321H, AISI Type 329, AISI Type 330, AISI Type 330HC, AISI Type 332, AISI Type 347, AISI Type 347H, AISI Type 348, AISI Type 348H, AISI Type 384, AISI Type 385, AISI Type 403, AISI Type 404, AISI Type 405, AISI Type 409, AISI Type 410, AISI Type 410Cb, AISI Type 410S, AISI Type 414, AISI Type 414L, AISI Type 416, AISI Type 416PlusX, AISI Type 416Se, AISI Type 418, AISI Type 420, AISI Type 420F, AISI Type 422, AISI Type 429, AISI Type 430, AISI Type 430F, AISI Type 430FSe, AISI Type 430Ti, AISI Type 431, AISI Type 434, AISI Type 436, AISI Type 440A, AISI Type 440B, AISI Type 440C, AISI Type 442, AISI Type 444, AISI Type 446, AISI Type 501, AISI Type 501A, AISI Type 501B, AISI Type 502, AISI Type 503, AISI Type 504, AISI Type 632, AISI Type 633, AISI Type 634, AISI Type 635, AL-6X, AM-350, AM-355, AM-363, Crutemp25, CryogenicTenelon, Custom450TM, Custom455TM, E-Brite26-1, HNM, JS-700, JS-777, Monit, Nitronic32, Nitronic33, Nitronic40, Nitronic50, Nitronic60, PH 13-8Mo, Sea-Cure/Sc-1, and Tenelon.
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Keywords, AISI (US), UNS (US), SAE (US), ASTM (US), AMS (US), ASME (US), MIL (US