A worker checks molten steel at an iron and steel plant in Dalian, Northeast China's Liaoning Province.
China has called on the United States to revoke its decision to impose tariffs on foreign steel and aluminum exports to the U.S.
U.S. President Donald Trump signed two proclamations on Thursday afternoon in the White House to impose 25 percent tariff on steel imports and 10 percent tariff on aluminum imports but he offered potential exemption for a number of countries.
Trump first announced the tariffs on March 1 after a Commerce Department investigation under the Section 232 of U.S. Trade Expansion Act of 1962 that found the imports threaten to impair U.S. national security.
Wang Hejun, head of the trade remedy and investigation bureau of China's Ministry of Commerce, said the U.S. measures are in essence trade protectionism in the guise of national security. He said most U.S. steel and aluminum imports are for civil use and by no means impair U.S. national security.
Wang said the U.S. abuse of "national security" provision is a wanton sabotage of the multilateral trading system represented by the World Trade Organization, and is set to hurt the normal international trading order.
"China firmly opposes that," he said in a statement posted on the ministry website.
"China urges the U.S. to respect the authority of the multilateral trading system and revoke the decision as soon as possible,"
Wang said China has lodged solemn complaints with the U.S. side through multiple channels and said China will assess its loss caused by the U.S. measures. "(China) will take strong measures to safeguard its legitimate interests," Wang said.
The China Iron and Steel Association on Friday called on the Chinese government to retaliate against the U.S. move by targeting "stainless steel products, galvanized sheet, seamless pipe, coal, agriculture products and electronic products," imported from the U.S., the association said in a statement posted on its website.
Trump's decision, though applauded by U.S. steel and aluminum producers, was strongly opposed by many who worry about a potential trade war with U.S. trade partners, a disruption in the global trading system and a rising cost of raw materials for many U.S. industries.
Trump said on Thursday that Mexico and Canada, the two countries that are renegotiating with the U.S. the North American Free Trade Agreement (NAFTA), will be exempted for now. He said the tariffs will still apply to the U.S.' two North American neighbors "if we don't make the deal on NAFTA and if we terminate NAFTA because they are unable to make a deal that's fair".
Some U.S. security allies could also be excluded if they can justify it, according to Trump.
The new tariffs will take effect on March 23.
"The actions we are taking today are not a matter of choice; they are a matter of necessity for our security," Trump said at the signing ceremony at the White House, surrounded by key cabinet members and several representatives from the steel and aluminum industries.
"You don't have steel, you don't have a country," Trump said.
Many U.S. lawmakers from Trump's Republican Party have criticized the decision. John McCain, Senator from Arizona, said that the tariffs will not protect America.
"They will harm the American economy, hurt American workers & damage relations with America's allies & partners," McCain said in a tweet on Thursday. Major steel and aluminum exporters to the U.S. are close U.S. allies and partners.
Jeff Flake, a Republican Senator from Arizona, threatened on Thursday to draft a bill to nullify Trump's decision.