AS 1831-2002 pdf free.Ductile cast iron.
3.2 Properties of the material
3.2.1 Mechanical properties
me properties of materials are given in clause 4 for machined test pieces prepared from separately cast test samples, and in clause 5 for test pieces prepared from cast-on test samples.
3.2.2 Microstructure
Where a microscopic examination is required, it shall be verified that the structure contains a minimum of 80 % of form V or VI graphite in accordance with ISO 945. The number of tests and the sampling conditions shall be defined by agreement between the purchaser and the manufacturer.
Non-destructive methods exist for testing the nodularity of the graphite and the matrix structure, which may be used, if necessary, to limit the number of micrographs to be made.
In cases of dispute, the result of the microscopic examination, which shall be carried out in accordance with an agreement between the purchaser and the manufacturer, shall prevail.
4 Requirements for separately cast test samples
4.1 Formation of batches
4.1.1 Non-continuous production
For non-continuous production, the batches shall be made up of castings made of iron originating from the same treatment ladle and, where necessary, having undergone the same heat treatment. The maximum mass of the batch shall be 2 000 kg of fettled castings. A single casting comprises a batch if its mass is equal to or greater than 2 000 kg.
4.1.2 Continuous production
For continuous production of the same grade, the maximum mass of the batch is limited to the tonnaqe Droduced in 2 h.
The test samples shall be stripped from the mould at a temperature riot exceeding 500 °C and, if necessary, they shaJl be subjected to the same heat treatment as the castings which they represent and at the same time.
If the spheroidizing treatment is carried out in the mould
(in-mould method) the test samples conforming to figure 1. 2 or
3rnaybe
— either cast side-by-side with the castings, with a joint feeder system;
— or cast separately, with a treatment device in the mould which shall resemble that of the casting as closely as possible.
4.4 Mechanical properties
44.1 Tensile strength. proof stress, elongation and additional information
The verification of the 0,2 % proof stress values shall be determined only if specified by the purchaser at the time of ordering.
When measured on machined test pieces prepared from separately cast test samples, the mechanical properties of spheroidal grdphite cast iron shall be as specified in table 1 or 2.
4.4.2 Impact test
The specified impact values given in table 2 apply only to grades 400-18 and 350-22.AS 1831 pdf download.