Hi,
In your case,If the fibre elongation is more than 5%,need HT(Normalising/stress relieve).your material thickness is 22mm only and If Fibre elongation is not exceed 5% no need to HT. Please find below the extraction of UCS79(d)
UCS79,(d) Vessel shell sections, heads, and other pressure
boundary parts of carbon and low alloy steel plates fabricated
by cold forming shall be heat treated subsequently
185
(see UCS-56) when the resulting extreme fiber elongation
is more than 5% from the as-rolled condition. For P-No.
1 Group Nos. 1 and 2 materials the extreme fiber elongation
may be as great as 40% when none of the following conditions
exist:
(1) The vessel will contain lethal substances either
liquid or gaseous (see UW-2).
(2) The material is not exempt from impact testing
by the rules of this Division or impact testing is required
by the material specification.
(3) The thickness of the part before cold forming
exceeds 5⁄8 in. (16 mm).
(4) The reduction by cold forming from the as-rolled
thickness is more than 10% at any location where the
extreme fiber elongation exceeds 5%.
(5) The temperature of the material during forming
is in the range of 250°F to 900°F (120°C to 480°C).
The extreme fiber elongation shall be determined by the
following formulas:
For double curvature (for example, heads),
% extreme fiber elongation =75t/Rf (1 −Rf/Ro)
where
Rf = final centerline radius, in. (mm)
Ro = original centerline radius (equals infinity for flat
plate), in. (mm)
t = plate thickness, in. (mm)
Thanks & Regards,
(Karthik)
Karthikeyan.S
QA/QC Manager
German-Thai Boiler Engineering Cooperation Limited.
Rayong Factory ;
379 Moo.6 Soi 8, Tambol Pananikom,
Nikompattana, Rayong 21180 THAILAND
Tel : +66 38 897 035-9 Ext. 137
Fax : +66 38 897 034
Hand Phone: 0066 892512282
From: kathiresan dhayanidhi <dhayak2000@gmail.com>
To: materials-welding@googlegroups.com
Sent: Friday, January 13, 2012 12:35 AM
Subject: [MW:13466] HT Dished Ends
From: kathiresan dhayanidhi <dhayak2000@gmail.com>
To: materials-welding@googlegroups.com
f
*Kindly confirm the the type of HT for Dished End cold formed*
*with SA 516 Gr 70 and thickness 22 mm plate.*
*ASME section V111 division 1 code needs to comply.*
*Regards*
*K.Dhayanidhi*
*V Excel Ventures Pvt Ltd*
*Chennai*
To: materials-welding@googlegroups.com
f
*Kindly confirm the the type of HT for Dished End cold formed*
*with SA 516 Gr 70 and thickness 22 mm plate.*
*ASME section V111 division 1 code needs to comply.*
*Regards*
*K.Dhayanidhi*
*V Excel Ventures Pvt Ltd*
*Chennai*
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