BS ISO 1083:2018,Spheroidal graphite cast irons – Classification.
BS ISO 1083:2018 defines the grades and the corresponding requirements for spheroidal graphite cast irons.
BS ISO 1083:2018 specifies two groups of spheroidal graphite cast iron grades by a classification based on mechanical properties measured on machined test pieces prepared from cast samples. The first group deals mainly with ferritic to pearlitic grades. The second group deals with solid-solution strengthened ferritic grades.
BS ISO 1083:2018 also gives an informative classification as a function of hardness.
The properties of spheroidal graphite cast irons depend on their structure.
Spheroidal graphite cast irons covered by this document are divided into two groups:
a) ferritic to pearlitic spheroidal graphite cast irons
b) solid-solution strengthened ferritic spheroidal graphite cast irons. The mechanical properties of the material can be evaluated on machined test pieces prepared from the following:
—separately cast samples;
—side-by-side cast samples:
—cast-on samples;
—samples cut from a casting.
The material grade is defined by mechanical properties measured on machined test pieces prepared from cast samples.
It is well known that tensile properties and hardness of spheroidal graphite cast irons are interrelated.
When considered by the purchaser as being important for the application, both tensile and hardness properties may be specified.
Some material grades can be suitable for pressure applications.
Further technical data on spheroidal graphite cast irons is given in Annexes C and G.

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