Normalized A572 Gr 50?
Normalized A572 Gr 50?
(OP)
As anyone dealt with normalized A572 50, I was under the
impression that it is only supplied in the as-rolled condition.
impression that it is only supplied in the as-rolled condition.
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RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
Originally, the A572 50 did not require impacts or hardness, so the PQR for this job was qualified using A572 50 (as rolled) to 8630M; the 8630M pasted the CVN test at 31/24 ft-lbs. @ -4 F, and the A572 failed (PWHT on PQR [1125 F for 4.5 Hrs]). I was aware that A572 50 does not do very well when stress relieved for that period of time.
I just never heard of normalized A572, so I am curious of its performance when it comes to impacts and hardness after PWHT.
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
The Q & T 8630M forgings temper temperatures varys from 1150 F to 1200 F, they require a 85 ksi yield min. and CVN's as stated above; the A572 50 plates were supplied in the as rolled condition. 1125 F is the stress relieve temperature used on the weldment these two materials make. Engineering believes that having the A572 50 plates in the normalized state will produce better results concering impacts.
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
RE: Normalized A572 Gr 50?
You can drop the temperature 200F with longer times and still approach a stress reduction approaching 100%. On some steels you can even go lower with a corresponding reduction in the percentage stress relief.
castle74,
The proposal by metengr to butter the 8630 then PWHT prior to welding on the welding the A572 is the better way out.