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Dish end heat treatment

Dish end heat treatment

Dish end heat treatment

(OP)
      
     Hello members
we have conflict with the fabricater of the dish end .about heat treatment .The dish is fabricated by cold forming according to (UCS-79) detail (d).the dish must be heat treated if the extreme fiber elongation is more than 5%.the fabricater give us calculation according to the attach .we are indoubt about this calculation please.about the use of Rf and Ro in the  equation is correct .please advice us .

also in (UCS-79) detail (3) the material thickness is more than 16mm it must be heat treated .what the advice about that please .

what is the maximum allowable limt hardness in carbon steel A515 GR60 .

THANKX IN ADVANCE                         

jamil a alshahed nama
hartha power station

RE: Dish end heat treatment

hyl;
I believe that Rf and Ro are well defined in UCS-79 based on the supplied formulas. In this same paragraph, for P-No 1, Groups 1 and 2 base materials, you can go up to 40% fiber elongation provided none of the conditions in (1) through (5) exist. If the thickness in the part exceeds 5/8" or 16mm, a subcritical heat treatment must be performed if the fiber elongation is more than 5% based on (3).

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