Heat treatment to CRA Clad/Lined pipes/fittings 1

[CoCoE]

I am very new to the materials, and I have 100s of doubts like below

My query is based on the below definition.
Cladded: CRA layer by EB, Hot rolling, or any other metallurgical bonds
Lined: Mechanically bonded with seal welding on the ends

1.Is there any difference in performance between cladding and lining?
2. My concerned product is HS carbon steel piping (Eg: API 5L PSL2 X60) with 304L clad. Is it required to do any heat treatment after hot rolled bonding (like normalizing or Q&T), or after explosion bonded cladding?
3. If normalized CS is specified as backing up material, how to consider the sensitization of 304L at normalizing temperature of CS?
4. What are the possible problems that may occur during the welding of 304L cladded/line pipe to a 304L cladded fitting, other than the roundness issues? (considering one-side welding)
5. What are the quality control usually applied for a cladded pipe weld joint?

I am looking for answers for all these.

Your help is appreciated.

 

[xianglecn]

no need heat treatment! sometime the clad/lined process is not a heat process.

 

[SJones]

1. What do you mean by "performance?"
2. Think about the metallurgy, the hot rolled austenitic part has to be in the solution annealed condition, and check product suppliers web sites for their manufacturing routes. Explosive bonding doesn't have such a heating cycle to deal with:

http://www.nobelclad.com/process.

There is discussion of the subject in Nickel Institute Publication 10 064 which was given to you in another thread.
3. See 2, and then perform a Google search on corrosion testing for sensitisation of 304L
4. The same problems that can occur were the items in carbon steel with the addition of imperfections arising from dissimilar metal welding, stringent root defect acceptance criteria, backpurging and grinding contamination considerations. Why not try a bit of searching?
5. ISO 3834-2

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.