All sources that I can find indicate that they are isogrid (or possibly orthogrid?) structural tanks manufactured of milled aluminum. However, I cannot find further detail about of which alloy specifically they are composed.

Are they Al-Li 2198, as is Falcon 9, or are they more similar to the Apollo-era Al 2014 used on upper stages of the Saturn family?

(Despite one being kerolox and one being hydrolox, I assume ULA makes their two booster families out of the same material to simplify logistics. I may be very wrong about that!)

  • $\begingroup$ I thought it was a typo, but nope! Common Core Booster and Common Booster Core $\endgroup$ – uhoh Jan 27 at 8:27
  • $\begingroup$ An alloy suitable for the temperature of LOX may be too brittle at the temperature of LH2. $\endgroup$ – Uwe Feb 4 at 23:26
  • $\begingroup$ In both cases they use Al 2014. $\endgroup$ – WOW 6EQUJ5 Feb 11 at 20:29
  • $\begingroup$ Do you have a source? $\endgroup$ – Anton Hengst Feb 11 at 20:31
  • $\begingroup$ For Atlas V:ulalaunch.com/docs/default-source/rockets/… page 375 For Delta IV you should explore FSW techniques of welding $\endgroup$ – WOW 6EQUJ5 Feb 11 at 20:37

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