High Strength Nickel Alloy INCOLOY 800/800H/800HT Bar For Marine And Pump Shafting

High Strength Forged Bars INCOLOY Nickel Alloy 800/800H/800HT Marine and Pump Shafting

Incoloy 800 was the first of these alloys and it was slightly modified into Incoloy 800H. This modification was to control carbon (.05-.10%) and grain size to optimize stress rupture properties. Incoloy 800HT has further modifications to the combined titanium and aluminum levels (.85-1.20%) to ensure optimum high temperature properties.The nickel alloy is dual certified (800H/HT) and combines the properties of both forms. Incoloy 800H/HT alloy was intended for high temperature structural applications. The nickel content makes the alloys highly resistant to both chloride stress-corrosion cracking and to embrittlement from precipitation of sigma phase. The general corrosion resistance is excellent. In the solution annealed condition, alloys 800H and 800HT have superior creep and stress rupture properties.

Common Trade Names:
                                        Incoloy 800 / UNS N08800 / Nickel Alloy 800 / Inconel 800 / W.Nr 1.4876

                                        Incoloy 800H / UNS N08810 / Nickel Alloy 800H / Inconel 800H / W.Nr 1.4958

                                        Incoloy 800HT / UNS N08811 / Nickel Incoloy 800HT /Inconel 800HT / W.Nr 1.4959

Specifications:
                         ASTM: B 407, B 408, B 409 ,ASME: SB 407 CODE CASE 1325, SB 408, SB 409

Incoloy 800/800H/800HT Characteristic:

• Excellent corrosion resistance in the water media of the extremely high temperature of 500C.
• Good stress corrosion resistance
• Good machining
• High creep strength
• Very good resistance to oxidation
• Good resistance to combustion gases
• Very good resistance to carburization
• Good resistance to nitrogen absorption
• Good structural stability at high temperatures
• Good weldability

Incoloy 800/800H/800HT Mechanical property
The main difference between alloys 800, 800H and 800HT is mechanical properties. The difference is due to the limited composition of the 800H and 800HT alloys and the high temperature annealing used for these alloys. In general, 800 alloys exhibit higher mechanical properties at room temperature and short exposure to high temperatures, while 800H and 800HT alloys exhibit excellent creep and fracture strength during prolonged exposure to high temperatures.

Incoloy 800/800H/800HT Corrosion resistance
Alloys 800, 800H, and 800HT have the same nickel, chromium, and iron content and generally exhibit similar corrosion resistance. Because 800H and 800HT alloys are used for their high temperature strength, the corrosive environment in which these alloys are placed usually involves high temperature reactions, such as oxidation and carburizing.

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