(a) All test pieces shall be selected by the Inspecting Officer and shall be tested in his presence and he shall satisfy himself that the conditions herein prescribed are fulfilled.

The tensile strength and percentage elongation shall be determined from round test pieces with gauge lengths of 5 d_o.

(i)

where,

Rm = tensile strength at room temperature, in kgf/mm²
100 = quality index
2.2 = a constant which is valid only when L_o = 5 d_o

where,

d_o = original diameter of round test piece”.
L_o = gauge length

Bend test pieces shall be of rectangular section 1 inch wide by ¾ inch thick. The edges shall be rounded to a radius of 1/16inch. The test pieces shall be bent over the thinner section.

The test pieces shall, when cold, be capable of being bent without fracture, through an angle of 180°, the internal radius of the bend being not greater than that specified in table below:-

Bend tests may be made by pressure or, by blows.