Sanicro 31HT, commonly known as Alloy 800HT, is an austenitic nickel-iron-chromium alloy. It is characterized by:

• 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

The grade can be used at temperatures up to about 1100°C (2010°F). In order to have the best ductility this grade should be used above 700°C (1290°F). Because of its high nickel content and prescribed maximization of (Ti + Al) content, Sanicro 31HT shows extremely little tendency to precipitation of embrittling phases.

Applications
The combination of good hot strength, with good structural stability and ductility, makes Sanicro 31HT a suitable grade for various products in plants producing synthetic gas for ammonia, methanol and town gas. Sanicro 31HT is a good choice for applications involving long term exposure at high temperatures and corrosive environments.