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Old 05-04-06, 03:28 PM
  #15  
hyperRevue
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Originally Posted by mattface
631

AFIK 531 is not made anymore, and new 531 frames are made from NOS tubesets. 631 is an "air hardening" alloy more suitable to tig welding than 531 was.
Ah, right.
That's what I meant.
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