AS 3679.1:2016 Structural steel
9.3.2.2 Bars Bars shall comply with the following:
(a) Hexagons, rounds and squares with nominal diameter or thickness less than or equal to 30 mm shall be tested in full section.
(b) For flats with width greater than 40 mm and nominal thickness of less than or equal to 30 mm, the axis of the test piece shall be as near as practicable to the quarter-width position, and shall be tested in full thickness.
(c) For hexagons, rounds and squares with nominal cross-sectional dimensions greater than 30 mm, a proportional test piece may be used. The axis of the test piece shall be parallel to the rolling direction and as near as practicable to a point one-sixth of the distance between diagonally (or diametrically) opposite surfaces.
(d) For flats with nominal thickness greater than 30 mm, a proportional test piece may be used. The axis of the test piece shall be parallel to the rolling direction and as near as practicable to the quarter-width position and to a point one-sixth of the distance between opposite surfaces.
9.3.2.3 Sections
For material with thickness greater than 30 mm, either a proportional cylindrical test piece or a non-proportional test piece in accordance with Table C2 of AS 1391—2007 (as amended) shall be used. For material less than or equal to 30 mm in thickness, a non-proportional test piece of full product thickness in accordance with Table C2 of AS 1391—2007 (as amended) shall be used (see Figure 9).
9.3.3 Impact test piece
The axis of the notch shall be perpendicular to the rolled surface of the bar or section other than rounds (see Figures 10 and 11). Test pieces shall be prepared in accordance with AS 1544.2 and with the following, as appropriate:
(a) Sections and flat bars For sections and flat bars of nominal thickness greater than or equal to 20 mm, material within 3 mm from the surface shall not be included. Machine standard test pieces shall be in accordance with Table 16. For sections and flat bars of nominal thickness less than 20 mm, material within 1 mm from the surface shall not be included. Machine standard test pieces shall be in accordance with Table 16.
NOTE: Impact tests on material with nominal thickness less than 7 mm are not covered by this Standard.
(b) Rounds, squares and hexagons For rounds, squares and hexagons of nominal thickness greater than 50 mm, material within 3 mm from the surface shall not be included. Machine standard test pieces shall be in accordance with Table 16.