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B31.1 Temperature Ratings

02/20/2012 9:30 AM

I know the temperature limits given for the stress values in Appendix A bottom out at -20F, but does that mean that A106 or A53 carbon steel cannot be installed outside where temperatures may drop to -40F on a few winter nights? I see the tables also include the lower limit of -20F for 304L SS, but I also see in other publications where that SS piping can be used down to -425F.

Thanks for any feedback.

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#1

Re: B31.1 temperature ratings

02/20/2012 9:41 AM

I know they had some problems with fatigue cracking on the Comet airliner and low-temperature embrittlement on the Titanic, though you won't see -425F very often on this planet.

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#2

Re: B31.1 Temperature Ratings

02/20/2012 12:29 PM

If I recall my old metallurgy classes, low carbon steels will start to lose tensile strength around -45F. You will want to carefully research the low temperature strength characteristics and determine how much you might want to derate the material used based on the internal and external temperatures that might occur.

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#3

Re: B31.1 Temperature Ratings

02/20/2012 5:41 PM

Operating below -20F carbon steels (A106, A53, A36)are susceptable to brittle failure.

Special Nickel bearing carbon steels have been developed for operating in that temperature range.

Austenitic stainless steels (304, 316) are not susceptable to brittle failure in this temperature range

www.shipstructure.org/pdf/65pdf

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#4

Re: B31.1 Temperature Ratings

02/20/2012 9:44 PM
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#5

Re: B31.1 Temperature Ratings

02/20/2012 11:06 PM
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#6

Re: B31.1 Temperature Ratings

02/21/2012 3:57 AM

Generally I have used A333 pipe and SA350LF2 fittings if the condition were to be below 0F degrees and we would change the welding procedure to TIG root and hot pass with ER70S wire and fill and cap with 7018 stick rod. A333 is basically the same as A106 grade B it has passed one more test.

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#7

Re: B31.1 Temperature Ratings

02/21/2012 8:35 AM

Thanks everyone for replies. Abdel, good job as usual, -50F would cover it. Matrix99, this is the specific answer I was looking for. So far it does look like they're chemically similar, are you aware if they are heat treated in a different manner to reduce brittleness at low temps? I bought A333 to review specs, I'll do the same with A106 and A53 and see what there is to see.

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