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(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.
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(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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