AS 1397:2021 pdf free.Continuous hot-dip metallic coated steel sheet and strip一Coatings of zinc and zinc alloyed with aluminium and magnesium.
2.3 Tensile test
2.3.1 General
When tested in accordance with AS 1391, the tensile properties shall meet the requirements of Tab1fs 2.3 and ZA.
2.3.2 Orientation of test piece
2.3.2.1 For formability grades
For Grades GI, G2 and G3, the tensile test piece shall be cut transverse to the direction of rolling.
2.3.2.2 For structural grades
For Grades G250, G300, G350, G450. G500 and G550, the tensile test piece shall be cut parallel to the direction of rolling.
NOTE 1 It is international practice to tensile test zinc-coated sheet and strip with the coating intact, and to calculate the strength using the cross-sectional area of the steel base metal only, since the contribution made by the zinc coating is so small that, for practical purposes, it can be ignored. The strength value obtained is close to the strength of the base material itself.
A similar testing practice with aluminium/zinc-coated products will give higher yield and tensile strength values than those of the base material itself, because the coating makes an appreciable contribution to these values (see Note 2). Nevertheless, this practice will continue because the coating also reduces the ductility of the material, i.e. the specimens will be tested with the coating intact.
NOTE 2 Design calculations, therefore, should be made using base steel thickness; the effect of the coating will then be accounted for in the quoted strength values which will represent the typical behaviour of the product in practice.
2.4 Bend test
2.4.1 General
The test piece with the coating intact shall be bend tested at room temperature in accordance with AS 2505.1. For structural grades, the test piece shall be bent around a mandrel with an external diameter specified in Table 2.3 and for formability grades, the test piece shall be bent flat to the requirements of Table 2.4. After the test, the coating shall be stripped from the bend, using a process that does not induce cracking, and the surface examined. No cracks shall be visible on the outside of the bend. Small cracks at the edges and cracks which require magnification to be visible shall be disregarded.
2.4.2 Orientation of test pieces
The test pieces for both formability and structural grades shall be cut transverse to the direction of rolling and bent with the bend axis parallel to the direction of rolling.AS 1397 pdf download.