South Africa have been lumped with countries like China, Brazil and Russia in having to pay these taxes.
South African companies benefited hugely from this arrangement with around 6,700 products being exempt from duties.
Experts have warned this policy could lead to vehicle imports being targeted.
In the short term, the South African economy is likely to take a hit by the increased tariffs.
The US receives about 5% of South Africas steel and aluminium output.
The US claims South Africa voted with it on only none occasions and against it 68 times.
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