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.

For more information on 800H/AT talk to NeoNickel