This Standard specifies the method for conducting a drop weight tear test (DWTT) for carbon steel, low alloy steel, and similar materials. In particular, it applies to testing line-pipe, and strip or plate intended for line-pipe of 150 mm in diameter or greater but excludes the testing of weld metal. Where thickness is greater than 19 mm, an alternative method is permitted.
NOTE 1 Difficulty may be experienced in applying this test to material of thickness less than 5 mm.
This test may be used to determine the appearance of propagating fractures over the temperature range where the fracture mode changes from brittle (cleavage or flat) to ductile (shear or oblique).
NOTE 2 The test should be used for the following purposes:
(a)For research and development, to study the effect of metallurgical variables such as composition or heattreatment, or of fabricating operations on the mode of fracture propagation.
(b)For evaluation of materials for service, to indicate the suitability of materials for service applications by indicating fracture propagation behaviour at the service temperature(s).
(c)For information or specification purposes, to provide a manufacturing quality control technique when suitable correlations have been established with service behaviour.

Originated as AS 1330-1974.
Second edition 2004.
Reconfirmed 2017.
Third edition 2019. Originated as AS 1330-1974. Second edition 2004. Reconfirmed 2017. Third edition 2019.