Sometimes, counter-weight type constant support is used instead of spring coil but I never either heard or experienced that disc spring was used in lieu of coil spring hanger support in oil&gas and petrochemical industry.

Generally disc spring is employed in piping stress engineering for the purpose of two;
First, to improve flange leakage and valve gland seal - Used with bolted bonnet of valves and flange joint. It can maintain the proper bolting pressure against long-term consolidation of gland packing material and bonnet gasket, and flange gasket in nuclear power and toxic chemical plants.
Second case is ; Typical hold down supports for pulsation system like reciprocating compressor/pump piping to mitigate vibration.

Can I see the vendor Catalog or website in China ? I am very interested in….