Wikipedia puts the TNT equivalency of ammonium nitrate at 2.38 kg of ammonium nitrate for one kg of TNT. The Texas City explosion had 2,200 tons of ammonium nitrate present, so my estimate for the potential TNT equivalency of that explosion is just less than one kiloton. Meaning the Wanggongchang explosion was 10-20x as big (my math might be a bit off there, but probably not by an order of magnitude.)
Even the Halifax explosion wasn't nearly as big as the Wanggongchang explosion. It's hard for me to fathom they had so much explosives there.
Even the Halifax explosion wasn't nearly as big as the Wanggongchang explosion. It's hard for me to fathom they had so much explosives there.