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Thanks everyone. It is much appreciated.

Hi everyone, I'm back. I would like to get the DBTT for Ph13-8Mo, H1000. Can anyone help? Thanks.

Try 4340 or 8740. Don't know about the cost, but the Metallic Materials Properties Development and Standardization (MMPDS) manual says these can substitute for 4140. You can get a free download here: http://www.everyspec.com/FAA/FAA-General/DOT-FAA-AR-MMPDS-01-JAN2003_24102/

metengr, Corrosion is part of the issue, but I can figure out a way around that; i.e. use of sealants or coatings to mitigate. The customer wants the DBTT values. Is there a way to go back to the customer and ask them to reconsider? Or is there a polite way to say DBTT is little value and this...

You can also look at MIL-STD-889 and it will cover this topic in depth and also give you some methods to mitigate corrosion.

Another one you could bring up is when you weld galvanized pipe, it becomes a health hazard. Any time your work on galvanized pipe, cutting, milling , drilling, etc., the coating becomes airborne and can get into your lungs.

Have you checked with your supplier? They might be able to suggest an alternative.

Unfortunately quite the opposite. If you apply an epoxy coating with a primer, such as one from Akzo-Nobels' 10-P4-3, or 466-23 Series topcoat that would probably do it. You can also use PR1776 sealant from PPG aerospace between the two parts to mitigate the corrosion.

Temperature limits are -69.7F to +160F. We also have to be sure the DBTT is less than -69.7F and recovery temperature of +180F.

Thanks all for your assistance. Sorry about the ambiguity, but the CRES I'm using goes from 301 all the way to PH13-8Mo.

I'm a non-metals guy (Plastics, composites) in a metals world. We are supplying parts to a new aerospace program and need to ensure the metals we are using are above a certain DBTT. Is there a place where I can look these up? Thanks.