Alloys 800H/HT® Nickel Pipe

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of alloys 800h/ht® nickel pipe in China. With abundant experience, we warmly welcome you to wholesale customized alloys 800h/ht® nickel pipe from our factory. For price consultation, contact us.

Alloys 800H® and 800HT® are iron-nickel-chromium solid solution strengthened alloys with a nominal chemical composition of 42% iron, 34% nickel, and 22% chromium. These two grades are variations of the base grade 800 and are referred to by the tradenames Incoloy® 800H and Incoloy® 800HT and the universal designation UNS N08810 and N08811, respectively. 800H® and 800HT® share the high-temperature oxidation and carburization resistance of Alloy 800 but have enhanced creep and stress rupture properties.

CHEMICAL COMPOSITION

The base composition of 800H/HT® is identical to the parent Alloy 800. However, in both 800H® and 800HT®, the levels of carbon, aluminum, and titanium are modified for improved creep resistance. The base 800 grade has a carbon range of 0 - 0.10%, while 800H® raises the minimum carbon level to 0.05%. Similarly, the base 800 grade has a combined aluminum and titanium content requirement of 0.30 - 1.20%, while 800HT® raises the minimum Al + Ti level to 0.85% and increases the minimum carbon to 0.06%.

CORROSION RESISTANCE

Both grades share the corrosion resistant characteristics of the base grade Alloy 800, including good general corrosion resistance, as well as good resistance to reducing and oxidizing acids, organic acids, seawater, salts, and particularly excellent resistance to nitric acid. Alloy 800H® and 800HT® also exhibit excellent corrosion resistance to chloride stress corrosion cracking (SCC). However, alloys 800H® and 800HT® are not recommended for sulfuric acid service. Additionally, they are susceptible to chromium carbide precipitation along grain boundaries when subjected to temperatures in the range of 1000°F - 1400°F (538°C - 760°C).

HEAT TREATMENT

Alloys 800H® and 800 HT cannot be strengthened by heat treating. They are typically solution annealed at 2050°F - 2150°F (1121°C - 1177°C) followed by rapid cooling. Stress-relieving at 1000°F - 1600°F (538°C - 870°C) may also be performed after cold working to reduce residual stresses and prevent distortion.

Mechanical Properties – Incoloy 800 / 800H / 800Ht Tubing & Pipe

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