U.S. Court Confirms AK Steel Does Not Infringe on Patent

           U.S. Court Confirms AK Steel Does Not Infringe on Patent

Company Can Continue To Sell Its ULTRALUME® Product

PR Newswire

WEST CHESTER, Ohio, March 22, 2013

WEST CHESTER, Ohio, March 22, 2013 /PRNewswire/ --AK Steel (NYSE: AKS) said
that the United States Court of Appeals for the Federal Circuit denied, on
March 20, 2013, ArcelorMittal's petition for re-hearing in its patent
infringement lawsuit involving aluminized boron steel.

This week's court decision again confirms that AK Steel does not infringe the
patent and can sell its ULTRALUME® aluminized boron steel product. AK Steel's
ULTRALUME® product is utilized for hot-stamped, press-hardened applications
where the ultimate tensile strength is less than 1,500 MPa.

AK Steel's ULTRALUME® is an advanced high-strength steel that is growing in
popularity for various automotive applications. AK Steel said that ULTRALUME®
has been accepted for use by numerous automotive original equipment
manufacturers (OEMs).

AK Steel
AK Steel produces flat-rolled carbon, stainless and electrical steels,
primarily for automotive, infrastructure and manufacturing, construction and
electrical power generation and distribution markets. The company employs
about 6,100 men and women in Middletown, Mansfield, Coshocton and Zanesville,
Ohio; Butler, Pennsylvania; Ashland, Kentucky; Rockport, Indiana; and its
corporate headquarters in West Chester, Ohio. Additional information about AK
Steel is available on the company's web site at www.aksteel.com.

AK Tube LLC, a wholly-owned subsidiary of AK Steel, employs about 300 men and
women in plants in Walbridge, Ohio and Columbus, Indiana. AK Tube produces
carbon and stainless electric resistance welded (ERW) tubular steel products
for truck, automotive and other markets. Additional information about AK Tube
LLC is available on its web site at www.aktube.com.

AK Coal Resources, Inc., another wholly-owned subsidiary of AK Steel, controls
and is developing metallurgical coal reserves in Somerset County,
Pennsylvania. AK Steel also owns 49.9% of Magnetation LLC, a joint venture
headquartered in Grand Rapids, Minnesota, which produces iron ore concentrate
from previously mined ore reserves.

SOURCE AK Steel

Website: http://www.aksteel.com
Contact: Media - Barry L. Racey, Director, Government and Public Relations,
(513) 425-2749; Investors - Albert E. Ferrara, Jr., Senior Vice President,
Corporate Strategy and Investor Relations, (513) 425-2888
 
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