The US Commerce Department imposed duties of more than 400 per cent on steel imports from Vietnam , accusing some businesses of shipping products from the Southeast Asian nation to evade the levies in a further escalation of tension between the two trading partners . In three preliminary circumvention rulings on Vietnamese steel, the Commerce Department said certain products produced in South Korea and Taiwan were shipped to Vietnam for minor processing before being exported to US as corrosion-resistant steel products and cold-rolled steel. Customs officials have been ordered to collect cash deposits at rates as high as 456.23 per cent on imports of the steel products produced in Vietnam using material from South Korea and Taiwan . Vietnam has a new partner in its old rivalry with China – the US Vietnam’s Ministry of Foreign Affairs didn’t immediately respond to a request for comment. It was not surprising companies would try to route products through countries such as Vietnam to dodge higher duties, said Robert Carnell, Asia-Pacific chief economist at ING Bank. “It’s a no-brainer,” he said. “You increase the cost and people are going to try and find a way to avoid it. It’s human nature.” In another case, US Customs and Border Protection is investigating six American companies for allegedly evading anti-dumping duties while importing and misclassifying Chinese-made carbon steel pipe fittings through Cambodia , according to the US Embassy in Phnom Penh. The US is hardening its rhetoric against Vietnam, one of its major trading partners and an economy that has benefited from President Donald Trump’s trade war with China . Trump described Vietnam last week as “almost the single-worst abuser of everybody” when asked if he wanted to impose tariffs on the nation. You increase the cost and people are going to try and find a way to avoid it Robert Carnell, ING Bank Vietnam says it’s working to reduce its trade surplus with the US, and is already cracking down on Chinese manufacturers who are re-routing their goods via the Southeast Asian nation for export to the US in order to bypass higher tariffs. The US Embassy in Hanoi said this week it’s in talks with authorities and hopes “Vietnam takes steps in the near term to address our concerns in a constructive manner.” Vietnam’s annual trade surplus with the US has exceeded US$20 billion since 2014 and reached US$39.5 billion last year, the highest in records going back to 1990, according to US Census Bureau data. Connect with us on Twitter and Facebook