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Extream Fiber elongation is more than 5%

Extream Fiber elongation is more than 5%

Extream Fiber elongation is more than 5%

(OP)
For P-No. 1 Group Nos. 1 and 2 materials the extreme
fiber elongation may be as great as 40% when none
of the conditions listed below in (1) through (5) exist.
(1) The vessel will contain lethal substances either
liquid or gaseous (see UW-2).
(2) The material requires impact testing.
(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%.
(5) The temperature of the material during forming
is in the range of 250°F to 900°F (121°C to 482°C).

I would like to know about item No.4. how to check and how to calculation?

thank you all for kindly

  

RE: Extream Fiber elongation is more than 5%

tananT;
If you review the 2007 edition of ASME B&PV Code, Section VIII, Div 1 UCS-79, subparagraph (4) reads.... the reduction by cold forming from the as-rolled thickness is more than 10% at any location where the extreme fiber elongation exceeds 5%.

This means if you add a step of cold forming that result in a wall thickness reduction of greater than 10% from the original supplied wall thickness in the location where the extreme fiber elongation was greater than 5%, you must conduct a thermal heat treatment after forming.

 

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