Cladding SS 316L at Normalized Temperature

You should be alright because it is with the low-carbon 304L.

The biggest issue is due to the time-temperature-transition curve and the susceptibility of intergranular corrosion/carbide precipitation/sensitization.

However, with the 'L' grade you are looking around a time of 8 hours at a temperature of around 600C.

So, barring you have a very slow cool down time - there should not be an issue.

By the way - what thickness is your head / how long of a soak time is specified?

thanks a lot~ now, i understand this Problem.

i have one question about the A516 Carbon steel+SS316L Clad Plate...

Ni Plating Between A516-60 or 70 Carbon steel and SS316L Clad Metal,

Q : Need? or Need Not? Please help me~^^

Sir, SS grade is 316L and not 304L. it's same?

Thank you.

They are not "the same" ......... (316L has 2% molybdenum)

However, the sensitization issue is the same. That is, because it is the low carbon grade (L), you shouldn't have an issue.

The stainless steel has no issues. You will have a problem with the steel. The SA-516 Gr.70 should not be heated over 1350ºF (732ºC). This is the "lower transformation temperature" referenced in UCS-85(f). If you heat the carbon steel material up to normalization temperatures, you have no guarantee that the material will be any good after the treatment and UCS-85 requires you to do a new set of tensile testing to prove that the material still meets SA-516 Gr.70.

UCS-79 wants a heat treatment per UCS-56, which is 1100ºF (595ºC) minimum, up to 1200ºF (649ºC) is OK.

As you have "L-grade" stainless steel cladding, with less than 0.03% carbon, you will not have any issues with sensitization for up to about 10 hours of heat treatment.

Dear Lawrence,

My Carbon Steel Plate already complete with Normalised at mill SA 516 Gr.70N, "N" sign mean Normalised. I'm not sure why you said Carbon steel can't Normalised.

Thank you.

Faizol

Normalization is a time-dependent process. The more time at normalization temperature that the carbon steel spends, the softer it gets. The ultimate and yield stress test results will go down, possibly below SA-516 minimums. Read through UCS-85 for the Code requirements on heating SA-516 above its lower tranformation temperature (1350ºF). I have done this and it has come out OK, but I don't think that it is guaranteed.

If you have a contact at a steel producer, call them up.

Irrespective of the 'there should be no problem comments', it would be advisable to confirm no degradation of the 316L material using ASTM A262 intergranular corrosion testing.