Ten new packages have opened for RFIs for work relating to flanged and threaded balancing valves, safety valves and steel castings.
In a cover letter available to businesses, Naval Group said it is crucial that Australian businesses are capable of meeting the company's "technical, time-scale and safety needs".
"The purpose of this RFI is to collect written information from Australian companies on their capability to supply products and technologies required to manufacture and sustain these submarines in Australia," the letter said.
Submissions for the RFIs close Monday, 12 February.
The latest RFIs come after 14 opened in November last year for work relating to fluidic, bolting and raw material for the 12 submarines. Submissions for these RFIs have since closed.
Businesses looking to submit RFIs can access the information on the ICN gateway here.