牌號 | ATI Steel ATI 800? |
廠家 | Allegheny Technologies Incorporated |
分類 | Steel |
介紹 | ATI 800? (UNS N08800), ATI 800H? (UNS N08810), and ATI 800AT? (UNS N08811) alloys are nickel-iron-chromium alloys designed to resist oxidation and carburization at elevated temperatures. The nickel content, 32%, makes the alloys highly resistant both to chloride stress-corrosion cracking and to embrittlement from precipitation of sigma phase. The general corrosion resistance is excellent. In the solution annealed condition, the ATI 800H? and ATI 800 AT? alloys have superior creep and stress rupture properties. All three versions of the basic ATI 800? alloy have been approved as materials of construction under ASME Boiler and Pressure Vessel Code, Section I-Power Boilers, Section III-Nuclear Vessels, and Section VIII-Unfired Pressure Vessels. ATI 800?, ATI 800H? and ATI 800AT? alloys are identical except for the higher level of carbon (0.05 to 0.10 percent) in the ATI 800H? alloy, and the addition of up to 1.00 percent aluminum + titanium in the ATI 800 AT? alloy. The ATI 800? alloy is normally used in service at temperatures to approximately 1100°F (593°C). The ATI 800H? and ATI 800 AT? alloys are normally used above approximately 1100°F where resistance to creep and stress rupture is required. |
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