He added that the domestically produced goods meet a large part of the internal demands.
"Today, in a significant portion of the economy, we do not need external [equipment], and domestic capabilities are sufficient to meet the [internal] needs", Shariatmadari underlined.
"Europe is very, very united in its position on the nuclear accord with Iran, and that will not change".
He further maintained that Iran has increased the steel production to 200 million tons now, which is 80 million tons more than 5 years ago.
Khamenei said that over the past two years the United States "has repeatedly violated" the nuclear deal but the Europeans had remained silent.
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Maas said European countries shared USA concerns about Iran's continued development of ballistic missiles and its behavior in the Middle East, but believed those issues should be addressed without undermining the nuclear deal.
His comments come in response to a press conference on Monday in which US Secretary of State Mike Pompeo threatened Iran with "the strongest sanctions in history".
Iran's Supreme Leader Ayatollah Ali Khamenei has said that Iran would defeat the United States if Iranian officials did their duty and that US President Donald Trump will vanish from history, like his predecessors. The Iranian nation have been victorious in all periods of history and I want to say it here, Mr Trump!
Pompeo told a House Foreign Affairs Committee hearing the administration meant to work with "as many partners, friends and allies as possible" to stop what he described as all of Tehran's nuclear and non-nuclear threats.
Maas said he had also discussed the Syrian civil war and the overall situation in the Middle East, as well as trade disputes in his meetings.
He also stipulated European powers must protect Iranian oil sales from USA plans to scuttle them by reimposing global sanctions on Tehran, and to continue buying Iranian crude.