Re: [MW:13470] HT Dished Ends

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*

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