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                                                                                          Updated October 9, 2018
Effects of U.S. Tariff Action on U.S. Aluminum Manufacturing


Since March 2018, the United States has assessed duties of
10% or more on certain imports of aluminum on national
security grounds. The duties are controversial, with some
Members of Congress questioning whether the duties will
encourage domestic aluminum production and whether they
could adversely affect U.S. industries that use aluminum.

Acting under Section 232 of the Trade Expansion Act (19
U.S.C. § 1862, as amended), which allows the President to
levy tariffs and quotas on imports found to threaten or
impair U.S. national security, President Trump signed a
proclamation that imposed a 10% tariff on foreign-made
primary unwrought aluminum and certain semifinished
aluminum products effective March 23, 2018.
Although aluminum manufactured in certain countries was
initially exempted, most exemptions expired on June 1,
2018, thereby extending the tariff to key sources of
aluminum imports, including Canada, the leading import
source of primary unwrought aluminum into the United
States. Argentina, which agreed to a quota, and Australia
are the only two countries that have been permanently
exempted. The tariff has no set expiration date; it can be
removed at any time. On August 10, 2018, the President
announced in a tweet he had authorized an increase of the
tariff on aluminum from Turkey to 20%, but he has not yet
signed a Section 232 proclamation putting the higher duty
into effect. The United States has also imposed sanctions on
Rusal, a Russian aluminum company and the world's
largest producer outside China.

As Figure 1 shows, unwrought aluminum, a light metal, is
made in two distinct ways. Primary aluminum production
consists of mining bauxite, refining it to produce alumina,
and then smelting alumina to yield aluminum.
Figure I. Aluminum Industry Overview


Source: Figure adapted by CRS from NERA Economic Consulting,
Impacts of Potential Aluminum Tariffs on the U.S. Economy, June 2017.
Secondary aluminum production uses recycled scrap melted
in a smelter. Although secondary aluminum can be
substituted for primary aluminum in most uses, primary
aluminum is favored in applications with high quality and
consistency requirements, such as electronics and aerospace


manufacturing. One U.S. smelter produces primary
aluminum of sufficient purity for use in military aircraft.
In 2017, U.S. production of primary aluminum totaled
741,000 metric tons, the lowest level since 1951, down
from 2.6 million metric tons in 2007, according to the U.S.
Geological Survey (USGS). U.S. production peaked in
1980 at 4.7 million metric tons, and the United States was
the world's top producer through 2000. In 2017, the United
States accounted for 1.2% of the world's primary aluminum
production.
At the end of 2017, Alcoa and Century Aluminum were the
two remaining operators of primary aluminum smelters in
the United States. In June 2018, Magnitude 7 Metals
restarted limited production at its primary aluminum
smelter, which had been closed since 2016. According to
USGS, capacity utilization of primary smelters stood at
37% in 2017.
Secondary aluminum is produced in two ways. Old scrap is
recovered from used aluminum cans, auto parts, aircraft,
and other products. New scrap is the leftovers from
processing wrought aluminum and cast products into
consumer or industrial products. Secondary aluminum
accounted for 83% of U.S. aluminum production in 2017.
The United States is now the world's largest producer of
secondary aluminum. China ranks second. Unlike primary
aluminum production, domestic production of secondary
aluminum has been fairly steady over the past two decades.
Caus-eso      De    inn    Prinry Allumi'fl

A Department of Commerce investigation of the aluminum
industry found that imports and global overcapacity, caused
in part by foreign government subsidies (particularly in
China), have had a substantial negative effect on domestic
production of primary aluminum. But it appears that
comparatively high electricity costs have been another
important factor affecting domestic production.
According to the Aluminum Association, electricity can
account for up to 40% of the costs of primary unwrought
aluminum production. For this reason, many U.S.
aluminum smelters were constructed in locations with
access to abundant developed hydropower. U.S. electricity
prices today, however, are generally higher than in many
other countries that produce aluminum. Alcoa and Century
have located their newer smelting operations near low-cost
electricity sources outside the United States. Favored
locations for primary smelting include Iceland, Russia, the
United Arab Emirates, Norway, and Canada. In response to
this and other factors, including exchange rates and labor
costs, many domestic facilities have cut back production or
shut down entirely.
The newest U.S. primary smelter was built nearly 40 years
ago. Primary smelting involves large capital investments-
industry groups estimate the cost of a new smelter at around


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