@Ironman
Some time ago, we already had a discussion on a High/Medium/Low mix of ships (Type-55/52/54) and costings.
The Type-52D and Type-55 are in same the cost range, with the Type-54A being way cheaper.
Notional figures are as follows:
Type-54A = approx $300M
Type-52D = approx $600M-1000M
Type-55 = approx $800M-1200M ($200M extra cost for hull/propulsion/VLS/etc)
So with the Type-55 versus Type-52D, you end up with a 75% increase in VLS cells from 64 to 112, whilst the cost only increases 17%-33%.
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Let's look at how China's Navy is likely to operate.
In 2025, we would likely see 3 carriers, each with a modest number of aircraft (24-36) on board.
Escort-wise, I imagine a CSG would comprise 4 anti-air destroyers (with one assigned as CSG AAW commander), 2 ASW frigates and 1 SSN. This is based on what we've seen in the USN previously.
With one Type-55 and three Type-52D, that is only 304 VLS cells, which is probably not enough for a decent anti-surface or land-attack cruise missile loadout, given the competing AAW requirement.
With the coming changes in weaponry, the Type-52D hull has already reached its limits to accommodate anything extra. So what will happen during the mid-life update in 15 years time?
So it just makes more sense to build on the Type-55 hull, which does have more VLS cells (for distributed lethality), hanger space for future UAV/UUVs, more gas turbines for future railguns/lasers, etc.
Also note that the Ticonderoga cruisers (which act as the CSG AAW commander) are actually the same size as the Arleigh Burke destroyers. And remember that the Type-55 is actually smaller than the Zumwalt.