US steel tariffs11 May 2018 02:17
Don't forget, when Trump said he was going to impose steel tariffs the EU hit back with the threat of very targeted retaliation.
https://www.nytimes.com/2018/03/02/business/europe-steel-tariffs-trump.html
Jean-Claude Juncker, president of the European Commission, made the remarks to the German news media in reaction to the proposed tariffs. He said the plans to tax the American goods, produced in the home states of key Republican leaders, had not yet been finalized, but amounted to treating them �the same way� that European products would be handled if the metals tariffs go through.
The result
https://www.telegraph.co.uk/news/2018/05/01/donald-trump-delays-steel-tariff-decision-eu-allies-june/
British manufacturers have won a temporary reprieve on 25 percent tariffs being added to steel exported to the United States after the White House announced on Monday night that it was postponing a decision to impose duties on key trading partners for 30 days, avoiding a trade war with Europe
Mr Trump imposed the hike, along with a 10 percent tariff on aluminum, in March but granted temporary exemptions to Canada, Mexico, Brazil, the European Union, Australia and Argentina.
Those temporary exemptions were due to expire at midnight on Monday, prompting last-minute negotiations.
Hours before the deadline, the White House said it had reached an �agreement in principle� with Argentina, Australia and Brazil, and was extending negotiations with Canada, Mexico and the EU.
I don't think Trump will want to end up in a trade war with Europe and the rest of the world over this, which is what will happen if he penalises EU & other companies that deal with Iran. On top of this he also loses US businesses deals with the EU and others such as China ready to step in and take up the slack.