3.1.2 All steering
unit components transmitting mechanical forces are to be of steel
or other approved ductile material. In general, such material is to
have an elongation of not less than 12 per cent nor a tensile strength
in excess of 650 N/mm2. Special consideration will be given
to the acceptance of grey cast iron for low pressure valve bodies
and mechanical parts with low stress levels.
3.1.3 Consideration
will be given to the acceptance of non-ferrous materials as applicable.