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Reg. 83
MATERIALS OF CONSTRUCTION

FORGED OR ROLLED PRESSURE PARTS OTHER THAN SEAMLESS DRUMS OF CARBON STEEL

Tensile strength

(a) The tensile strength of the material shall conform to one of the following four grades:-

(i) 37 to 45 kgf/mm2
(ii) 42 to 50 kgf/mm2
(iii) 47 to 56 kgf/mm2
(iv) 52 to 62 kgf/mm2

(b) The upper yield point at room temperature shall be not less than 50% of the specified minimum tensile strength.

(c) The minimum values of the stress at proof limit 0.2% at elevated temperature Et of the material may be calculated by multiplying the minimum specified tensile strength at room temperature R20 by the value of the ratio Et/R20 given in the table under Regulation 16.

(d) The breaking elongation in percentage shall not be less than

     93-Rm
----------------------
         2.2

Where, Rm =

Measured tensile strength at room temperature in kgf/mm2
93 = quality index
2.2 = a constant which is valid only when Lo = 5 do

Where, 

 

Lo = gauge length.
do = original diameter of the round test piece".

 
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Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
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