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Reg. 32
MATERIALS OF CONSTRUCTION

WROUGHT IRON STAY AND RIVET BARS

Special Iron for Screw Stays for Fire-boxes and Combustion Chambers.

In order that iron screw stays may be approved of the same size as would be required for mild steel, the iron must withstand the following tests:-

(a) Tensile Tests.- The tensile breaking strength shall not be less than 21½ tons per square inch, with an elongation of not less than 25 per cent measured on the Standard Test Piece B or 30 per cent measured on the Standard Test Piece B1.

(b) Bend Tests.- Test pieces either of the bar as rolled, or turned down to 1 inch diameter, shall stand bending cold until the sides are parallel and the space between the two sides is not greater than the diameter of the test piece.

(c) Number of Tensile Tests.- The bars as rolled shall be placed in batches of twenty, and one tensile test shall be taken from each batch. If this is unsatisfactory two other bars shall be selected for test, and should either of these fail the batch shall be rejected.

(d) Number of Bend Tests.- One ordinary bend test shall be taken from each batch, and a similar test piece from each batch shall be lightly and evenly nicked on one side with a sharp cutting tool and bent back at this point through an angle of 180 degrees by pressure or by a succession of light blows. The fracture must be clean, fibrous, free from slag or dirt or any coarse crystalline structure. If either of these is unsatisfactory, two other bars shall be selected for test, and should either of these fail the batch shall be rejected.

(e) In all cases the selection of the test pieces shall be made by the Inspector or the Inspecting Officer.

 
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