This is a simple duty arbitrage play. For anyone wondering what he actually did wrong, there are a few key points to note. Aluminum (and all materials, really) is exported and imported and duties are paid on the basis of the HS code and (if there is a trade agreement to be taken advantage of) certificates of origin (COO) along with the usual shipping docs. China is inclined to tax exports of primary aluminum because…
A similar, and perhaps more amusing, situation happened in Canada a few years ago. We have a 245.5% import tariff on cheese (why? Because dairy farmers are more important than poor people, apparently) but there was a much lower tax on "food preparations", including packaged pizza toppings. So companies would package up "pizza topping kits" in the USA, import them to Canada as "food preparations"... and then remove th…
There is a famous example where Ford imported cargo vans from Europe to the US with disposable seats in them so they would be taxed (more cheaply) as passenger vans. I think the tax in question was referred to as the "chicken tax".
The situation is a bit different but China's value-added tax scheme combined with the prevalence of factories in bonded export zones leads to a lot of useless shipping of goods (or components of goods) from China to Hong Kong (or another nearby foreign jurisdiction) and back for no good reason other than to avoid tax. I'm sure this works out great for the local freight industry...