Sanicro 31HT is an austenitic nickel-iron-chromium alloy 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

Sanicro 31HT can be used at temperatures up to about 1100°C (2010°F). In order to have the best ductility, it should be used above 700°C (1290°F).

The grade can also be supplied in a modified version for use in the temperature range between about 550 and 700°C (1020-1290°F). The chemical composition and heat treatment of this version have been adapted for the highest possible creep ductility. Contact us for further information.

Sanicro 31HT is not generally used under wet corrosive conditions. For this type of environment, we recommend Sanicro 30, which is specially adapted for wet corrosive conditions up to about 550°C (1020°F).

Applications
Sanicro 31HT has high strength and structural stability at high temperature and very good ductility. The most common applications for this grade are:

• Pigtails and headers in plants for the production of synthetic gas for ammonia, methanol and town gas

• Furnace tubes in the production of vinyl chloride, ethylene and radiant tubes

• Heat exchanger tubing for fluidized bed combustion

• Muffle tubes in continuous wire annealing furnaces

• Thermocouple protection tubes