Typical Charpy values for API 5L X65?

[HgTX]

Does anyone know what might be typical CVN results at 0 degrees C for API 5L X65? I'm asking about the base metal, not the weld.

Hg

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[metengr]

At least 100J at 0 deg C for some of the Japanese and some domestic steel plates used to manufacture API line pipe.

 

[HgTX]

Does 450J sound like a reasonable result?

Hg

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[metengr]

Actually, it is possible. Make sure you are comparing full size CVN impact energy values. I used the value of 100J because that was the minimum I have seen published for some work that was performed by JFE on line pipe steel plate.

I reviewed a paper from JFE Oil and Gas on devleopment of X100 steels, and they had CVN values reported for JOE and COE formed BM plate steel. The CVN BM values at -10 deg C were between 310 to 320 J. At higher temperature, the CVN values would be slightly higher.

 

[HgTX]

Looks like standard test; it's 10 mm x 10 mm.

I guess it's OK. I'm not used to this steel, and the numbers seemed ridiculously high, especially since the minimum spec requirement is only 27J.

Hg

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[ulyssess]

450 J at 0 deg C can be achieved, especially if chemical compositions with low carbon < 0,05% are chosen.

 

[HgTX]

Yeah, this stuff is very low carbon.

Hg

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[stanweld]

HgTX
While "typical" toughness values should not be ascribed to X65 pipe due to highly differnet melting and thermal/mechanical heat treatments used in its manufacture, the values you described are certainly obtainable and have been obtained for at least the past 25 years.

 

[HgTX]

Thanks!

Next question--how consistent should the results be? I have 4 heats, 3 samples each, and they're within about 5% of each other. I would expect to see more scatter.

Hg

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[metengr]

HgTX;
Not necessarily. I have seen many CVN test results with less scatter than you reported for typical B&PV plate steels that are not microalloy, and are N&T.

 

[HgTX]

Okay, I guess I'll shut up and stop fretting about this plate.

Thanks, everyone!

Hg

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