solution Annealing requirement for Inconel 800 HT

[mthakur]

We are replacing primary reformer tubes and its outlet pipe which is made in inconnel 800 HT is welded to existing 800 HT pigtail. I would like to know is it required to solution annealed the weld after repair and why. The existing inconel 800 HT pigtail is in service for more than 7 years and normally subjected to 700 to 750 Deg C.
The pigtails are 1.5" X 6.35 mm thk pipes.

regards

 

[metengr]

mthakur;
You can search for this information by visiting the web site below and under Products search for Incoloy 800/800HT

http://www.specialmetals.com/index.php

This site also links to welding (fabrication) information for nickel-base alloys.

 

[0707]

“INCO-WELD A Welding Electrode is used for shielded-metal-arc welding of INCOLOY alloys 800 and 800HT, INCONEL alloys 600 and 601, and nickel steels. The weld metal has excellent strength and oxidation resistance at high temperatures and retains impact resistance at cryogenic temperatures. The electrode is an exceptionally versatile product for dissimilar welding. It can be used on a variety of austenitic and ferritic steels and nickel alloys. Examples are combinations of stainless steels, carbon steels, INCONEL alloys, INCOLOY alloys, MONEL alloys, and copper-nickel alloys. Because of its versatility, INCO-WELD A Welding Electrode is especially useful for general maintenance welding of equipment exposed to strenuous service conditions.
The electrodes provide excellent operability for groove and fillet welding in the downhand position and the smaller diameter electrodes are also suitable for all position welding. Power supply: direct current, electrode positive.”

Specifications
AWS A5.11 ENiCrFe-2 (UNS W86133)
ASME II C SFA-5.11, ENiCrFe-2 (UNS W86133)
ASME IX, F-No.43

About 800HT welding please see the sites bellow

http://committees.api.org/standards/CRE/sccm/meetings/docs/s06/h2furnace-cooke.pdf

http://www.cheresources.com/invisio...901d1f51dc8e3d3&&act=attach&type=post&id=1017

http://www.hghouston.com/dcforum/DCForumID1/168.html

Hope it helps

lm

 

[ijzer]

If you follow ASME Viii-1 Code you have to perform heat treatment.