800H/AT

Applications

Perfect for applications in the Petrochemical & Refinery sector

800H/AT can be used in a variety of applications including:

• Super-heaters and re-heater tubing
• Reformer outlet pigtails and manifolds
• Heat exchangers
• Pressure vessels
• Dampers
• Industrial furnaces

About 800H/AT

With close control of the carbon, aluminium and titanium contents combined with the high temperature anneal, 800H/AT has significantly higher creep-stress rupture strength than Alloy 800.

This alloy is commonly welded using RA82 (ERNiCr-3) bare wire for applications under 788°C. RA330-04 (UNS N08334) bare filler wire offers a closer match than RA82 based on the thermal expansion coefficient and higher strength. For maximum strength alloy 617 (ERNiCrCoMo-1) bare wire or 117 (ENiCrCoMo-1) covered electrodes are suggested.

To avoid possible stress relaxation grain boundary cracking in applications above 538°C the welded fabrication may be heat treated at 899°C for approximately one hour per inch of thickness or 30 minutes minimum followed by air cooling.

Properties

Density:

7.94 g/cm³

Melting Range:

1357 – 1385°C

Specific Heat Capacity:

460 J/kg°C (0-100°C)

Curie Temperature:

-115°C