Thanks for starting this thread.
The only China headphones I own that haven't already been mentioned in this thread are the Somic V2.
They're open back 40mm cans, I picked them up from gearbest for £30 when they were on sale. They can still be found for about £35 on aliexpress. They're my second favourite Chinese headphones after Takstar Hi2050. In fact some days I prefer these, but today I prefer the the Hi2050
The construction is ridiculously good, stainless headband and plenty of metal around the cups makes them feel really sturdy. They sound excellent, though if I was being picky I'd say they're a little muddled in the upper mids at times.
Link to aliexpress ---> https://goo.gl/hMaAar