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Reg. 77
MATERIALS OF CONSTRUCTION

STEEL CASTING


Tensile Test


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

(b) A proportional test piece with Lo = 5 do shall be used as test specimen.

(c) The minimum values of 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 ratio Et/R20 given in table under regulation 16.

(d) The breaking elongation in % shall be not less than  93 - Rm
                                                                                                         2.2 

Where, Rm = measured tensile strength at room temperature in kgf/mm2 ;
93 = a 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.


(e) If, however, the tensile tests are carried out on specimens conforming to any other standards, the material will be accepted provided the tensile strength and elongation computed on the basis of the dimension of the test pieces under the regulation shall conform to the above requirements.

 
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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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