Incoloy 800HT / UNS N08811 / 1.4959 Nickel Alloy Seamless Pipe ASTM B407

1. Grade: Incoloy 800HT

2. Process: VIR - VAR - ESR - Forging - Cold Rolling / Cold Drawing - Semifinished - Finished

3. Delivery Condition: Solution Annealed

4. Surface Condition: AP, BA, Polished

5. OD: 6-325mm

6. WT: 0.5-25mm

7. Length: Max. 25 meters

8. Specification: ASTM, ASME, GB, JIS, GOST, DIN, etc.

9. Packing: Plywood case, Bundle

The chemical composition of Alloy 800HT

Incoloy 800/800H/800HT Introduction

Incoloy 800, 800H, and 800HT are nickel-iron-chromium alloys having high resistance to carburization and oxidation in high-temperature exposure and with good strength. These nickel steel alloys are identical except for the higher level of carbon in alloy 800H, and the addition of up to 1.20 % aluminum and titanium in alloy 800HT.

Incoloy 800 was the first of these alloys and it was slightly modified into Incoloy 800H. The modification made was to control carbon (.05-.10%) and grain size to optimize stress rupture properties. Incoloy 800HT has more modifications to the combined aluminum and titanium 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 actually meant for high-temperature structural applications. These alloys are resistant to embrittlement from precipitation of sigma phase and chloride stress-corrosion cracking due to the nickel content. The corrosion resistance is quite high.

In the solution annealed condition, alloys 800H and 800HT have excellent creep and stress rupture properties. The dual certified 800H/HT alloy is commonly available also with Mega Mex.

Incoloy 800 is mainly used in applications with temperatures up to 1100° F, where alloys 800H and 800HT are normally used in temperatures above 1100° F where resistance to creep and rupture is required. The chemical balance allows the nickel steel alloy to exhibit excellent resistance to carburization, oxidation and nitriding atmospheres.

Incoloy 800HT will not become embrittled even after long periods of usage in the 1200-1600° F range where many stainless steels become brittle.

Superior cold forming properties associated with the nickel-chromium alloys are exhibited with 800HT. When cold forms extensively, the grain size produces a visibly undulated surface called “orange peel”. Incoloy 800HT can be welded by the common techniques used on stainless steels.