Which is the common equivalent of 15Mo3 tubes for ASME.
Material must be suitable for H2S, HIC, NACE

Thanks

UNS K11522. SA-209, SA-250, SA-335, SA-369.
Cheers

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Konrad Anikiel

Thanks akonrad,
I was also considering SA-209 even if it isn't for a boiler or superheater.
Please note that SA-350 & SA-369 are Pipes, not tubes.

Thanks anyway!

Grtz

You can use pipes, as long as it's dimensionally suitable.

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Konrad Anikiel

Note: There is NO ASME material EQUIVALENT to 15Mo3.

The materials mentioned are SIMILAR but NOT EQUIVALENT to 15Mo3.

For ASME-stamped items I would strongly recommend to avoid the use of 15Mo3.
For ASME-stamped items e.g. SA-335 Grade T1 may be an option.

Best regards

Sascha Wegener

From DIN 17175:
C 0.12-0.20
Si 0.10-0.35
Mn 0.40-0.80
P 0.035 max
S 0.035 max
Mo 0.25-0.35

From SA209:
C 0.10-0.20
Si 0.10-0.50
Mn 0.30-0.80
P 0.025 max
S 0.025 max
Mo 0.44-0.65

Apparently, K11522 cannot be 15Mo3, because of different, non-overlaping Moly ranges. I wolud say, it won't be worse. Everything depends on what's the problem. Is it substitution of already designed material during fabrication, is it attempt to a recertification, is it to satisfy a customer's requirement, is it to make something as it was before (a tube bundle replacement in an old heat exchanger)...

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Konrad Anikiel